WO2000058293A2 - Glucokinase activators - Google Patents

Glucokinase activators Download PDF

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Publication number
WO2000058293A2
WO2000058293A2 PCT/EP2000/002450 EP0002450W WO0058293A2 WO 2000058293 A2 WO2000058293 A2 WO 2000058293A2 EP 0002450 W EP0002450 W EP 0002450W WO 0058293 A2 WO0058293 A2 WO 0058293A2
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WO
WIPO (PCT)
Prior art keywords
cyclopentyl
phenyl
propιonamιde
thιazol
lower alkyl
Prior art date
Application number
PCT/EP2000/002450
Other languages
French (fr)
Other versions
WO2000058293A3 (en
Inventor
Fred Thomas Bizzarro
Wendy Lea Corbett
Antonino Focella
Joseph Francis Grippo
Nancy-Ellen Haynes
George William Holland
Robert Francis Kester
Paige E. Mahaney
Ramakanth Sarabu
Original Assignee
F. Hoffmann-La Roche Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR10-2001-7012279A priority Critical patent/KR100455635B1/en
Priority to AU39630/00A priority patent/AU767830B2/en
Priority to AT00918816T priority patent/ATE278680T1/en
Priority to BRPI0009486-2A priority patent/BR0009486B1/en
Priority to MXPA01009814A priority patent/MXPA01009814A/en
Priority to EP00918816A priority patent/EP1169312B1/en
Priority to JP2000607996A priority patent/JP3884232B2/en
Application filed by F. Hoffmann-La Roche Ag filed Critical F. Hoffmann-La Roche Ag
Priority to DE60014610T priority patent/DE60014610T2/en
Priority to NZ514038A priority patent/NZ514038A/en
Priority to CA002368347A priority patent/CA2368347C/en
Priority to SI200030538T priority patent/SI1169312T1/en
Priority to DK00918816T priority patent/DK1169312T3/en
Priority to IL14532200A priority patent/IL145322A0/en
Publication of WO2000058293A2 publication Critical patent/WO2000058293A2/en
Publication of WO2000058293A3 publication Critical patent/WO2000058293A3/en
Priority to IL145322A priority patent/IL145322A/en
Priority to HR20010688A priority patent/HRP20010688B1/en
Priority to NO20014671A priority patent/NO320697B1/en
Priority to HK02107692.4A priority patent/HK1046139B/en

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
    • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
    • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D213/72—Nitrogen atoms
    • C07D213/75—Amino or imino radicals, acylated by carboxylic or carbonic acids, or by sulfur or nitrogen analogues thereof, e.g. carbamates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
    • A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
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    • C07C275/00—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C275/46—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups containing any of the groups, X being a hetero atom, Y being any atom, e.g. acylureas
    • C07C275/48—Y being a hydrogen or a carbon atom
    • C07C275/50—Y being a hydrogen or an acyclic carbon atom
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    • C07C317/00—Sulfones; Sulfoxides
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    • C07C323/50—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and carboxyl groups bound to the same carbon skeleton
    • C07C323/62—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and carboxyl groups bound to the same carbon skeleton having the sulfur atom of at least one of the thio groups bound to a carbon atom of a six-membered aromatic ring of the carbon skeleton
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    • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D213/78—Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen, e.g. ester or nitrile radicals
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    • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D213/78—Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen, e.g. ester or nitrile radicals
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    • C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
    • C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
    • C07D233/66—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D233/88—Nitrogen atoms, e.g. allantoin
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    • C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
    • C07D237/02—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings
    • C07D237/06—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D237/10—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D237/22—Nitrogen and oxygen atoms
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    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/32—One oxygen, sulfur or nitrogen atom
    • C07D239/42—One nitrogen atom
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    • C07D253/00—Heterocyclic compounds containing six-membered rings having three nitrogen atoms as the only ring hetero atoms, not provided for by group C07D251/00
    • C07D253/02—Heterocyclic compounds containing six-membered rings having three nitrogen atoms as the only ring hetero atoms, not provided for by group C07D251/00 not condensed with other rings
    • C07D253/06—1,2,4-Triazines
    • C07D253/065—1,2,4-Triazines having three double bonds between ring members or between ring members and non-ring members
    • C07D253/07—1,2,4-Triazines having three double bonds between ring members or between ring members and non-ring members with hetero atoms, or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
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    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D261/00—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings
    • C07D261/02—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings
    • C07D261/06—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having two or more double bonds between ring members or between ring members and non-ring members
    • C07D261/10—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having two or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
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    • C07D263/34—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
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    • C07D277/20—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D277/32—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D277/38—Nitrogen atoms
    • C07D277/44—Acylated amino or imino radicals
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    • C07D277/02—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings
    • C07D277/20—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D277/32—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
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    • C07D277/20—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D277/32—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D277/58—Nitro radicals
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    • C07D285/00—Heterocyclic compounds containing rings having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by groups C07D275/00 - C07D283/00
    • C07D285/01—Five-membered rings
    • C07D285/02—Thiadiazoles; Hydrogenated thiadiazoles
    • C07D285/04—Thiadiazoles; Hydrogenated thiadiazoles not condensed with other rings
    • C07D285/12—1,3,4-Thiadiazoles; Hydrogenated 1,3,4-thiadiazoles
    • C07D285/125—1,3,4-Thiadiazoles; Hydrogenated 1,3,4-thiadiazoles with oxygen, sulfur or nitrogen atoms, directly attached to ring carbon atoms, the nitrogen atoms not forming part of a nitro radical
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Definitions

  • Glucokinase is one of four hexokinases that are found in mammals [Colowick, S.P., in The Enzymes, Nol. 9 (P. Boyer, ed.) Academic Press, New York, NY, pages 1-48, 1973].
  • the hexokinases catalyze the first step in the metabolism of glucose, i.e., the conversion of glucose to glucose-6-phosphate.
  • Glucokinase has a limited cellular distribution, being found principally in pancreatic ⁇ -cells and liver parenchymal cells.
  • GK is a rate-controlling enzyme for glucose metabolism in these two cell types that are known to play critical roles in whole-body glucose homeostasis [Chipkin, S.R., Kelly, K.L., and Ruderman, N.B. in Joslin 's Diabetes (CR. Khan and G.C. Wier, eds.), Lea and Febiger, Philadelphia, PA, pages 97-115, 1994].
  • concentration of glucose at which GK demonstrates half-maximal activity is approximately 8 mM.
  • the other three hexokinases are saturated with glucose at much lower concentrations ( ⁇ 1 mM).
  • GK does indeed play a critical role in whole-body glucose homeostasis.
  • Animals that do not express GK die within days of birth with severe diabetes while animals overexpressing GK have improved glucose tolerance (Grupe, A., Hultgren, B., Ryan, A. et al, Cell 83, 69-78, 1995; Feme, T., Riu, E., Bosch, F. et al., FASEB J., 10, 1213-1218, 1996).
  • An increase in glucose exposure is coupled through GK in ⁇ -cells to increased insulin secretion and in hepatocytes to increased glycogen deposition and perhaps decreased glucose production.
  • This invention provides a compound, composing an amide of the formula I
  • R 1 and R 2 are independently hydrogen, halo, ammo, hydroxyammo, nitro, cyano, sulfonamido, lower alkyl, -OR 5 , -C(O)OR 5 , perfluoro-lower alkyl, lower alkyl thio, perfluoro-lower alkyl thio, lower alkyl sulfonyl, perfluoro-lower alkyl sulfonyl or lower alkyl sulf yl,
  • R J is cycloalkyl having from 3 to 7 carbon atoms or lower alkyl having from 2 to 4 carbon atoms, R 4 is -C(O)NHR 40 ; or an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six-membered heteroaromatic ring contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom; said mono- substituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of lower alkyl, halo, nitro, cyano, -(CH 2 ) n -OR 6 , -(CH 2 ) n -C(O)OR 7 , -(CH 2 ) n -
  • R 3 is hydrogen, lower alkyl or perfluoro-lower alkyl
  • R 6 , R 7 and R 8 are independently hydrogen or lower alkyl
  • the * indicates the asymmetric carbon atom in this compound.
  • the compound of formula I may be present either as a racemate or in the "R" configuration at the asymmetric carbon shown.
  • the "R” enantiomers are preferred.
  • Glucokinase activators are useful for increasing insulin secretion in the treatment of type II diabetes.
  • the present invention also relates to a pharmaceutical composition comprising a compound of formula I and a pharmaceutically acceptable carrier and/or adjuvant. Furthermore the present invention relates to the use of such compounds for the preparation of medicaments for the treatment of type II diabetes. The present invention also relates to processes for the preparation of the compounds of formula I. In addition, the present invention relates to a method for the therapeutic treatment of type II diabetes, which method compnses administering a compound of formula I to a human being or an animal
  • halogen and the term “halo”, unless otherwise stated, designate all four halogens, i.e fluorine, chlo ⁇ ne, bromine and iodine
  • a preferred halogen is chlo ⁇ ne.
  • lower alkyl includes both straight chain and branched chain alkyl groups having from 1 to 7 carbon atoms, such as methyl, ethyl, propyl, isopropyl, preferably methyl and ethyl.
  • Halo lower alkyl designates a lower alkyl group wherein one of the hydrogens is replaced by a halogen as defined above, which replacement can be at any site on the lower alkyl, including the end.
  • a preferred halo lower alkyl group is chloroethyl
  • hydroxy lower alkyl designates a lower alkyl group where one of the hydrogens is replaced by a hydroxy, at any site including the end.
  • Preferred hydroxy lower alkyl groups include ethanol, isopropanol, and n-propanol.
  • perfluoro-lower alkyl means any lower alkyl group wherein all of the hydrogens of the lower alkyl group are substituted or replaced by fluoro Among the prefe ⁇ ed perfluoro- lower alkyl groups are t ⁇ fluoromethyl, pentafluoroethyl, heptafluoropropyl, etc.
  • lower alkyl thio means a lower alkyl group as defined above where a thio group is bound to the rest of the molecule
  • perfluoro-lower alkyl thio means a perfluoro-lower alkyl group as defined above where a thio group is bound to the rest of the molecule
  • lower alkyl sulfonyl means a lower alkyl group as defined above where a sulfonyl group is bound to the rest of the molecule.
  • perfluoro-lower alkyl sulfonyl means a perfluoro-lower alkyl group as defined above where a sulfonyl group is bound to the rest of the molecule.
  • lower alkyl sulfinyl means a lower alkyl group as defined above where a sulfinyl group is bound to the rest of the molecule.
  • hydroxyamino designates an amino group where one of the hydrogens is replaced by a hydroxy.
  • cycloalkyl means a saturated hydrocarbon ring having from 3 to
  • cycloalkyl cyclopentyl
  • lower alkenyl denotes an alkylene group having from 2 to 6 carbon atoms with a double bond located between any two adjacent carbons of the group.
  • Preferred lower alkenyl groups are allyl and crotyl.
  • lower alkoxy includes both straight chain and branched chain alkoxy groups having from 1 to 7 carbon atoms, such as methoxy, ethoxy, propoxy, isopropoxy, preferably methoxy and ethoxy.
  • aryl signifies aryl mononuclear aromatic hydrocarbon groups such as phenyl, tolyl, etc. which can be unsubstituted or substituted in one or more positions with halogen, nitro, lower alkyl, or lower alkoxy substituents and polynuclear aryl groups, such as naphthyl, anthryl, and phenanthryl, which can be unsubstituted or substituted with one or more of the aforementioned groups.
  • Prefe ⁇ ed aryl groups are the substituted and unsubstituted mononuclear aryl groups, particularly phenyl.
  • arylalkyl denotes an alkyl group, preferably lower alkyl, in which one of the hydrogen atoms is replaced by an aryl group.
  • arylalkyl groups are benzyl, 2- phenylethyl, 3-phenylpropyl, 4-chlorobenzyl, 4-methoxybenzyland the like.
  • lower alkanoic acid denotes lower alkanoic acids containing from 2 to 7 carbon atoms such as propionic acid, acetic acid and the like.
  • lower alkanoyl denotes monovalent alkanoyl groups having from 2 to 7 carbon atoms such as propionoyl, acetyl and the like.
  • aromatic acids denotes aryl alkanoic acids where aryl is as defined above and alkanoic contains from 1 to 6 carbon atoms.
  • aroyl denotes aroic acids wherein aryl is as defined hereinbefore, with the hydrogen group of the COOH moiety removed Among the prefe ⁇ ed aroyl groups is benzoyl
  • the heteroaromatic ⁇ ng R 4 can be an unsubstituted or mono-substituted five- or six-membered heteroaromatic nng having from 1 to 3 heteroatoms selected from the group consisting of oxygen, nitrogen or sulfur and connected by a ⁇ ng carbon to the amme of the amide group shown
  • the heteroaromatic ⁇ ng contains a first nitrogen heteroatom adjacent to the connecting ⁇ ng carbon atom and if present, the other heteroatoms can be sulfur, oxygen or nitrogen
  • Such heteroaromatic ⁇ ngs include, for example, pyrazinyl, py ⁇ dazmyl, isoxazolyl, isothiazolyl, and pyrazolyl
  • the preferred heteroaromatic ⁇ ngs are included py ⁇ dmyl, py ⁇ midinyl, thiazolyl, oxazolyl and lrmdazolyl
  • These heteroaromatic ⁇ ngs which constitute R 4 are connected via a ⁇ ng carbon
  • hydrolyzable ester or ether protecting groups designates any ester or ether conventionally used for protecting carboxylic acids or alcohols which can be hydrolyzed to yield the respective hydroxyl or carboxyl group
  • ester groups useful for those purposes are those m which the acyl moieties are de ⁇ ved from a lower alkanoic, aryl lower alkanoic, or lower alkane dicarboxcyc c acid
  • activated acids which can be utilized to form such groups are acid anhyd ⁇ des, acid halides, preferably acid chlo ⁇ des or acid bromides derived from aryl or lower alkanoic acids
  • anhyd ⁇ des are anhyd ⁇ des de ⁇ ved from monocarboxy c acid such as acetic anhyd ⁇ de, benzo
  • amo protecting group designates any conventional am o protecting group which can be cleaved to yield the free am o group
  • the prefe ⁇ ed protecting groups are the conventional ammo protecting groups utilized in peptide synthesis Especially preferred are those am o protecting groups which are cleavable under mildly acidic conditions from about pH 2 0 to 3
  • Particularly prefe ⁇ ed ammo protecting groups are t-butoxycarbonyl (BOC), carbobenzyloxy (CBZ) and 9-flurorenylmethoxycarbonyl (FMOC)
  • pharmaceutically acceptable salts include any salt with both inorganic or organic pharmaceutically acceptable acids such as hydrochlo ⁇ c acid, hydrobromic acid, mt ⁇ c acid, sulfu ⁇ c acid, phospho ⁇ c acid, cit ⁇ c acid, formic acid, maleic acid, acetic acid, succmic acid, tarta ⁇ c acid, methanesulfonic acid, ⁇ r -toluene sulfonic acid and the like
  • pharmaceutically acceptable salts also includes any pharmaceutically acceptable base salt such as am e salts, t ⁇ alkyl am e salts and the like Such salts can be formed quite readily by those skilled in the art using standard techniques
  • the present invention relates to a compound compnsmg an amide of the above formula I, wherein
  • R 1 and R " are independently hydrogen, halo, ammo, hydroxyammo, cyano, nitro, lower alkyl, -OR 5 , -C(O)OR 5 , perfluoro-lower alkyl, lower alkyl thio, perfluoro- lower alkyl thio, lower alkyl sulfonyl, perfluoro-lower alkyl sulfonyl, lower alkyl sulfinyl, or sulfonamido,
  • R J is cycloalkyl having from 3 to 7 carbon atoms
  • R is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ⁇ ng connected by a ⁇ ng carbon atom to the amme group shown, which five- or six- membered heteroaromatic ⁇ ng contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ⁇ ng carbon atom; said mono-substituted heteroaromatic ⁇ ng being monosubstituted at a position on a ⁇ ng carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of lower alkyl, halo, nitro, cyano, -(CH 2 ) n -OR 6 , -(CH 2 ) n -C(O)OR 7 ,
  • R 3 is hydrogen, lower alkyl, or perfluoro-lower alkyl
  • R 6 , R 7 and R 8 are independently hydrogen or lower alkyl, or a pharmaceutically acceptable salt thereof
  • the present invention relates to a compound compnsmg an amide of the above formula I, wherein
  • R ! and R 2 are independently hydrogen, halo, amino, nitro, cyano, sulfonamido, lower alkyl, perfluoro-lower alkyl, lower alkyl thio, perfluoro-lower alkyl thio, lower alkyl sulfonyl, or perfluoro-lower alkyl sulfonyl, R J is cycloalkyl having from 3 to 7 carbon atoms or lower alkyl having from 2 to 4 carbon atoms;
  • R 40 is hydrogen, lower alkyl, lower alkenyl, hydroxy lower alkyl, halo lower alkyl, -(CH 2 ) n -C(O)OR 5 or -C(O)-(CH 2 ) n -C(O)OR 6 ;
  • R 3 and R 6 are hydrogen or lower alkyl
  • heteroaromatic residues in R 4 are unsubstituted or mono-substituted five- or six-membered heteroaromatic ⁇ ngs selected from the group consisting of thiazolyl, pyndinyl, imidazolyl, isoxazolyl, oxazolyl, py ⁇ dazmyl, py ⁇ midinyl or thiadiazolyl Especially prefe ⁇ ed are unsubstituted thiazolyl, unsubstituted pyndinyl or pyndinyl substituted by halogen, lower alkyl, hydroxy lower alkyl or -C(O)OR 5 , wherein R 3 is lower alkyl.
  • residues R 40 in accordance with the present invention are lower alkyl or lower alkenyl
  • Preferable residues R 1 in accordance with the present invention are hydrogen, halo, nitro and cyano, more preferable are hydrogen or halo.
  • Preferable residues R " m accordance with the present invention are hydrogen, lower alkyl sulfonyl, perfluoro-lower alkyl, perfluoro-lower alkyl sulfonyl, halo or -OR 3 wherein R 3 is perfluoro-lower alkyl; more preferable are halo or lower alkyl sulfonyl
  • residues R J in accordance with the present invention are cyclopentyl, cyclohexyl or cycloheptyl, more preferable is cyclopentyl.
  • R 4 is a group -C(O)NHR 40 , wherein R 40 is as defined above.
  • R 40 of the amide is hydrogen, lower alkyl, or lower alkenyl.
  • Such amides are prefe ⁇ ed when R J is cyclopentyl, especially when the amide is in the "R" configuration at the asymmetric carbon shown.
  • R and R of the amide are hydrogen.
  • Such an amide is l-(3-cyclopentyl-2-phenyl-propionyl)-3-methyl-urea.
  • one of R 1 and R 2 is hydrogen and the other is cyano or halo.
  • amides examples include: l-[2-(3-chloro-phenyl)-3 cyclopentyl-propionyl]-3-methyl-urea; l-[2-(4-chloro-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea; 1 -[2-(4-cyano-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea; l-[2-(4-bromo-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea.
  • R and R of the amide are each independently halo (preferably chloro). Examples of such amides are:
  • one of R and R of the amide is hydrogen or halo and the other is nitro.
  • examples of such amides are: l-[2-(4-chloro-3-nitro-phenyl)-3-cyclopentyl-proprionyl]-3-methyl-urea; l-[3-cyclopentyl-2-(4-nitro-phenyl)-propionyl]-3-methyl-urea.
  • one of R 1 and R " is hydrogen, lower alkyl thio or perfluoro-lower alkyl thio and the other is lower alkyl thio or perfluoro-lower alkyl thio.
  • amides examples include: l-[3-cyclopentyl-2-(4-t ⁇ fluoromethylsulfanyl-phenyl)-prop ⁇ onyl]-3-methyl urea; l-[3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-prop ⁇ onyl]-3-methyl urea.
  • one of R 1 and R 2 is hydrogen or perfluoro-lower alkyl sulfonyl and the other is perfluoro-lower alkyl sulfonyl.
  • examples of such amides are l-[3-cyclopentyl-2-(4-t ⁇ fluoromethanesulfonyl-phenyl)-prop ⁇ onyl]-3-methyl urea; l-[3-cyclopentyl-2-(3-t ⁇ fluoromethanesulfonyl-phenyl)-prop ⁇ onyl]-3-methyl urea.
  • At least one of R 1 and R 2 is lower alkyl sulfonyl.
  • one of R 1 and R 2 is hydrogen or lower alkyl sulfonyl and the other is lower alkyl sulfonyl, and more preferably R" is lower alkyl sulfonyl.
  • amides examples include: l-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-prop ⁇ onyl]-3-methyl urea; l- ⁇ 2-[4-(butane-l-sulfonyl)-phenyl]-3-cyclopentyl-prop ⁇ onyl ⁇ -3-methyl-urea; l-[3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-prop ⁇ onyl]-3-methyl-urea; l-[2-(3,4-b ⁇ s-methanesulfonyl-phenyl)-3-cyclopentyl-prop ⁇ onyl]-3-methyl-urea.
  • R 1 and R 2 are lower alkyl sulfonyl
  • one of R ! and R 2 is cyano or halo and the other, preferably R 2 , is lower alkyl sulfonyl.
  • amides examples include: l-[2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-prop ⁇ onyl]-3-methyl-urea; l-[3-cyclopentyl-2-(3-fluoro-4-methanesulfonyl-phenyl)-prop ⁇ onyl]-3-methyl-urea; l-[2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-prop ⁇ onyl]-3-methyl-urea; l-[2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-proprionyl]-3-methyl-urea; l-[2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-prop ⁇ onyl]-3-ethyl-urea;
  • At least one of R 1 and R 2 is lower alkyl
  • R and R are perfluoro-lower alkyl and the other, preferably R , is lower alkyl sulfonyl.
  • An Example of such an amide is l-[3-cyclopentyl-2-(4-methanesulfonyl- 3-tnfluoromethyl-phenyl)-prop ⁇ onyl]-3-methyl-urea.
  • At least one of R 1 and R 2 is perfluoro- lower alkyl and the other is halo.
  • Examples of such amides are: l-[3-cyclopentyl-2-(4-fluoro-3-t ⁇ fluoromethyl-phenyl)-prop ⁇ onyl]-3-methyl urea; l-[3-cyclopentyl-2-(3-fluoro-4-t ⁇ fluoromethyl-phenyl)-prop ⁇ onyl]-3-methyl urea.
  • At least one of R 1 and R 2 is lower alkyl sulfonyl, one of R 1 and R 2 is nitro and the other is lower alkyl sulfonyl.
  • An example of such an amide is l-[3-cyclopentyl-2-(4-methanesulfonyl-3-n ⁇ trophenyl)-prop ⁇ onyl]-3- methyl-urea.
  • R of the amide is hydrogen, lower alkyl, or lower alkenyl and R J is cyclopentyl.
  • R 40 is the same but R J is not cyclopentyl.
  • one of R 1 and R 2 is halo or hydrogen and the other is hydrogen.
  • An example of such an amide is [2-(4-chloro-phenyl)-4-methyl-pentanoyl]-
  • R and R may each be chlo ⁇ ne.
  • amides are: [3-cyclopropyl-2-(3,4-d ⁇ chloro-phenyl)-prop ⁇ onyl]-urea; [3-cyclobutyl-2-(3,4-d ⁇ chloro-phenyl)-prop ⁇ onyl]-urea; R-[2-(3,4-d ⁇ chloro-phenyl)-4-methyl-pentanoyl]-urea; l-[2-(3,4-d ⁇ chloro-phenyl)-4-methyl-pentanoyl]-3-methyl-urea; l-[2-(3,4-dichloro-phenyl)-hexanoyl]-3-methyl-urea.
  • R 40 is as desc ⁇ bed above and R 3 is cyclohexyl.
  • one of R 1 and R 2 is halo or hydrogen and the other is halo.
  • Examples of such amides are- 3-[cyclohexyl-2-(3,4-dichloro-phenyl)-propionyl]-urea;
  • R 40 is as described above and R 3 is cycloheptyl.
  • one of R 1 and R 2 is halo or hydrogen and the other is halo.
  • An example of such an amide is [3-cycloheptyl-2-(3,4-d ⁇ chloro-phenyl)-prop ⁇ onyl]-urea.
  • R 40 is -(CH 2 ) n -C(O)OR 5 or -C(O)-(CH 2 ) n -C(O)OR 6
  • R J of the amide is cyclopentyl
  • R and R are independently halo.
  • R 40 is hydroxy lower alkyl, or halo lower alkyl.
  • R J of the amide is cyclopentyl
  • R 1 and R 2 are independently halo, and in addition the amide is m the "R" configuration at the asymmetnc carbon shown.
  • Examples of the above amides are: l-[3-cyclopentyl-2-(3,4-d ⁇ chloro-phenyl)-propnonyl]-3-(2-hydroxy-ethyl)-urea; l-[3-cyclopentyl-2-(3,4-d ⁇ chloro-phenyl)-propnonyl]-3-(2-hydroxy-propyl)-urea; l-[3-cyclopentyl-2-(3,4-d ⁇ chloro-phenyl)-propnonyl]-3-(3-hydroxy-propyl)-urea; l-[3-cyclopentyl-2(R)-(3,4-d ⁇ chloro-phenyl)-prop ⁇ onyl]-3-(2-hydroxy-propyl)-urea, l-(2-chloro-ethyl)-3-[3-cyclopentyl-2-(3,4-d ⁇ chloro-phenyl)-propnonyl]-
  • R 4 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ⁇ ng connected by a ⁇ ng carbon atom to the amme group shown, which five- or six-membered heteroaromatic ⁇ ng contams from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ⁇ ng carbon atom, said mono-substituted heteroaromatic nng being monosubstituted at a position on a ⁇ ng carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of lower alkyl, halo, nitro, cyano, -(CH 2 ) n -OR 6 , -(CH 2 ) n -C(O)OR 7 , -(CH 2 ) n -C(O)NHR 6 , -C(O)-C(O)OR
  • R 3 is cyclopentyl (the compound I-D).
  • the embodiments of the compound I-D are those compounds where R 4 is an unsubstituted thiazole (Compound I-Dl).
  • the va ⁇ ous embodiments of the compound of I-Dl are included those compounds where a) one of R 1 and R 2 is hydrogen, halogen, perfluoro-lower alkyl and the other of said
  • R and R ⁇ is halo or perfluoro-lower alkyl
  • R and R " is ammo, nitro, halo, nitro or hydrogen and the other of said R and R " is ammo, cyano or nitro
  • one of R 1 and R 2 is lower alkyl sulfonyl, hydrogen, nitro, cyano, ammo, hydroxyammo, sulfonamido or halo, and the other of said R 1 and R 2 is lower alkyl sulfonyl
  • e) one of R 1 and R 2 is lower alkyl sulfonyl, and the other of said R 1 and R" is halo or perfluoro-lower alkyl
  • R and R is perfluoro-lower alkyl sulfonyl; g) one of R 1 and R 2 is -OR 5 , or -C(O)OR 5 and the other of said R 1 and R 2 is hydrogen or -OR 5 ; and R 3 is as above; and h) one of R 1 and R 2 is -OR 5 and the other is halo.
  • R 3 is cyclopentyl
  • the embodiments are those compounds where R 4 is a mono-substituted thiazole (compounds I-D2).
  • compounds I-D2 are those compounds where the mono-substitution is -(CH 2 ) n -OR 6 and n and R 6 are as above (compounds I- D2(a))
  • compounds I-D2 (a) are those compounds where: a) one of R 1 and R 2 is halo and the other of said R 1 and R 2 is hydrogen or halo; b) one of R 1 and R 2 is lower alkyl sulfonyl, and the other of said R 1 and R 2 is lower alkyl sulfonyl or hydrogen, and c) one of R 1 and R 2 is hydrogen and the other of said R 1 and R 2 is lower alkyl or perfluoro-lower alkyl.
  • R J is cyclopentyl and R 4 is a mono-substituted thiazole
  • the compounds I-D are those compounds where the mono-substituted thiazole is substituted with -(CH 2 ) n -C(O)OR 7 , wherein n is 0 or 1 and R 7 is hydrogen, or lower alkyl
  • Compounds of I-D2(c) Among the embodiments of compounds of formula I-D2(c) are those compounds where: a) one of R 1 and R 2 is hydrogen and the other of said R 1 and R 2 is halo, b) R 1 and R 2 are each independently halo, c) one of R 1 or R 2 is nitro, ammo or hydrogen and the other of said R 1 and R" is nitro or amino, and d) one of R 1 and R 2 is lower alkyl sulfonyl, perfluoro-lower alkyl, halogen or hydrogen and the other of said R 1 andR" is lower alkyl sulfonyl.
  • R 1 1 a) one of R and R are hydrogen and the other of said R and R is nitro or am o; b) one of R 1 and R 2 is halo or perfluoro-lower alkyl and the other of said R 1 and R 2 is perfluoro-lower alkyl, halogen or hydrogen; and c) one of R 1 and R 2 is hydrogen or halogen and the other of said R 1 and R 2 is lower alkylsulfonyl.
  • compounds I-D2 are those compounds where the mono-substitution on the thiazole ⁇ ng is a nitro group and one of R 1 and R 2 are hydrogen aanndd hhaallooggeenn aanndd the other of R 1 and R 2 is halogen or lower alkyl sulfonyl (compound of formula I-D2(e))
  • R 3 is cyclopentyl (Compound I-D) and R 4 is an unsubstituted pyndme (Compounds I-D3).
  • compound I-D3 are those compounds where. a) one of R and R ⁇ are halo, perfluoro-lower alkyl or hydrogen and the other of said R 1 and R 2 is halo, perfluoro-lower alkyl, amino, cyano or nitro; b) one of R 1 and R 2 is lower alkyl thio, perfluoro-lower alkyl thio or cyano, and the other is hydrogen;
  • R and R is lower alkyl sulfonyl, halo, cyano, nitro or hydrogen and the other of said R 1 and R 2 is lower alkyl sulfonyl; and d) one of R 1 and R 2 is perfluoro-lower alkyl sulfonyl, lower alkyl sulfonyl or hydrogen and the other of said R 1 and R 2 is perfluoro-lower alkyl sulfonyl or perfluoro-lower alkyl
  • R and R are each independently halo; b) wherein one of R 1 and R 2 is hydrogen and the other of said R 1 and R 2 is halo, ammo, cyano or nitro; and c) one of R 1 and R 2 is perfluoro-lower alkyl sulfonyl, lower alkyl sulfonyl or hydrogen and the other of said R 1 and R 2 is perfluoro-lower alkyl sulfonyl or lower alkyl sulfonyl.
  • inventions of the compounds of formula I-D4(b) are those compounds where the pyridine ⁇ ng is mono-substituted with -(CH 2 ) ⁇ -OR D wherein n and R are as above (Compounds I-D4(b)).
  • embodiments of the compound I-D4(b) are those compounds where: a) one of R 1 and R 2 are halo and the other of said R 1 and R 2 is hydrogen or halo; and
  • R and R is lower alkyl sulfonyl or hydrogen and the other of said R and R 2 is lower alkyl sulfonyl.
  • R J is cyclopentyl and R is a mono- substituted pyndme nng are those compounds where the pyridine nng is mono- substituted with a halo or perfluoro-lower alkyl substituent
  • the compound of formula I- D4(c) Among the embodiments of the compound of formula I-D4(c) are those compounds where: a) one of R 1 and R 2 is halo or hydrogen and the other is halo; and b) one of R 1 and R 2 is halo, nitro or hydrogen and the other is perfluoro-lower alkyl sulfonyl or lower alkyl sulfonyl.
  • embodiments of the compound I-D4(d) include compounds where one of R and R " is halo and other of said R 1 or R ⁇ is hydrogen, halo, or lower alkyl sulfonyl.
  • compounds of formula I where R 3 is cyclopentyl and R 4 is mono-substituted pyridine and the mono- substitution is a lower alkyl group (Compounds I-D4(e)).
  • compounds I-D4(e) are those compounds where one of R 1 and R 2 is halo or hydrogen and the other of R 1 and R 2 is halo, perfluoro-lower alkyl, perfluoro-lower alkyl sulfonyl, or lower alkyl sulfonyl.
  • R 3 is cyclopentyl and R is a mono-substituted pyridine are those compounds where the mono-substituent is -(CH 2 ) n -C(O)-NHR 6 , wherein n and R are as above (Compound I-D4(f)).
  • compound I-D4(f) are those compounds wherein one of R 1 and R are independently selected from the group consisting of halo or hydrogen and the other of said R 1 and R 2 is halo, or lower alkyl sulfonyl
  • R J is cyclopentyl
  • R 4 is an unsubstituted imidazolyl
  • I-D5 is an unsubstituted imidazolyl
  • Another embodiment of the compounds of this invention are those compounds where R J is cyclopentyl and R 4 is an isoxazolyl nng (the compound I-D6)
  • the embodiments of compound I-D6 are those compounds where the isoxazolyl ⁇ ng is unsubstituted or substituted, preferably mono-substituted Among the mono-substituted substituents, the prefe ⁇ ed substituents substituted on the isoxazolyl ⁇ ng is lower alkyl
  • 1 9 is halo, nitro, lower alkyl sulfonyl or perfluoro-lower alkyl and the other of R and R is hydrogen or halo
  • R J is cyclopentyl
  • R 4 is either an unsubstituted oxazolyl, or an oxazolyl mono-substituted with a lower alkyl group
  • R or R" is halo, nitro, lower alkyl sulfonyl or
  • R J is cyclopentyl
  • R 4 is pyndazmyl which is either unsubstituted or substituted with a lower alkyl group
  • R 4 is pyndazmyl which is either unsubstituted or substituted with a lower alkyl group
  • R or R " is halo, nitro, lower alkyl sulfonyl or perfluoro-lower alkyl and the other is hydrogen or halo
  • R J is cyclopentyl where R 4 is an unsubstituted thiadiazolyl ⁇ ng
  • R 4 is an unsubstituted thiadiazolyl ⁇ ng
  • R 1 or R " is halo, nitro, lower alkyl sulfonyl or perfluoro-lower alkyl and the other of said R 1 and R 2 is hydrogen or halo
  • R 3 in the compound of formula I can be cycloheptyl or cyclohexyl
  • the embodiments of the compound of formula I where R ⁇ is cycloheptyl or cyclohexyl include those compounds where R 4 is thiazolyl which can be mono-substituted or unsubstituted
  • R 4 is thiazolyl which can be mono-substituted or unsubstituted
  • R 4 is a heteroaromatic ⁇ ng
  • Examples of compounds of formula I according to the present invention, wherein R 4 is a residue -C(O)NHR 40 and R 40 is as defined above, are: l-(3-cyclopentyl-2-phenyl-propionyl)-3-methyl-urea, l-[2-(3-chloro-phenyl)-3 cyclopentyl-propionyl]-3-methyl-urea, l-[2-(4-chloro-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea, l-[2-(4-cyano-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea, l-[2-(4-bromo-phenyl)-3-cyclopentyl-propionyl]-3-methyl urea,
  • the compounds of formula I may be derivatised at functional groups to provide derivatives which are capable of conversion back to the parent compounds in vivo. Additionally, any physiologically acceptable equivalents of the compounds of formula I, which are capable of producing the parent compounds of formula I in vivo, are within the scope of this invention.
  • the compound of formula I can be prepared starting from the compound of formula N by the following Reaction Scheme:
  • R 42 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six-membered heteroaromatic ring contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ⁇ ng carbon atom; said mono-substituted heteroaromatic ⁇ ng being monosubstituted at a position on a ⁇ ng carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of lower alkyl, halo, nitro, cyano, -(CH 2 ) n -OR 6 , -(CH 2 ) n -C(O)OR 7 , -(CH 2 ) n -C(O)NHR 6 , -C(O)-C(O)OR 8 or -
  • the carboxylic acids and their lower alkyl esters of formula V wherein one of R 1 and R " is nitro, cyano, thio, ammo, chloro, bromo, or lodo and the other is hydrogen are commercially available
  • they can be converted to the co ⁇ esponding esters of lower alkyl alcohols using any conventional este ⁇ fication methods. All the reactions hereto forward are to be earned out on lower alkyl esters of the carboxylic acids of formula V.
  • the amino substituted compounds of formula V can be converted to other substituents either before or after conversion to the compounds of formulae I-a, I-b, I-c or I-d.
  • the amino groups can be diazotized to yield the corresponding diazomum compound, which in situ can be reacted with the desired lower alkyl thiol, perfluoro-lower alkyl thiol (see for example, Baleja, J.D. Synth. Comm. 1984, 14, 215; Giam, C. S.; Kikukawa, K., J. Chem. Soc, Chem. Comm 1980, 756; Kau, D.; Krushmski, J. H.; Robertson, D. W, J. Labelled Compd Rad. 1985, 22, 1045; Oade, S.; Shinhama, K.; Kim, Y. H., Bull Chem Soc. Jpn.
  • any conventional method of converting an aromatic halo group to the co ⁇ esponding alkyl group see for example, Katayama, T., Umeno, M., Chem. Lett. 1991, 2073; Reddy, G. S.; Tarn., Organometallics, 1984, 3, 630; Novak, J., Salemmk, C. A., Synthesis, 1983, 7, 597; Eapen, K. C; Dua, S. S.; Tamboroski, C , J. Org Chem.
  • the thio substituent can be oxidized to a -SO 3 H group which then can be converted to -SO Cl which is reacted with ammonia to form the sulfonamide substituent -S(O) 2 -NH 2 -
  • the co ⁇ esponding nitro compounds can be used as starting material and can be converted to the corresponding compounds where R 1 and/or R 2 are hydroxyammo. Any conventional method of converting a nitro group to the co ⁇ espondmg aromatic hydroxyammo compound can be used to affect this conversion
  • the carboxylic acids or lower alkyl esters of formula N wherein both of R 1 and R 2 are chloro or fluoro are commercially available. In cases, where only the carboxylic acids are available, they can converted to the co ⁇ esponding esters of lower alkyl alcohols using any conventional este ⁇ fication method.
  • Any conventional method of converting an aryl methyl group to the co ⁇ esponding aryl acetic acid can be utilized to effect this conversion (see for example, Clark, R. D.; Muchowski, J. M.; Fisher, L. E.; Flippin, L. A.; Repke, D. B.; Souchet, M, Synthesis, 1991, 871).
  • the compounds of formula N where both R 1 and R 2 substituents are ammo can be obtained from the corresponding dmitro compound of formula N, descnbed above. Any conventional method of reducing a nitro group to an amme can be utilized to effect this conversion.
  • the compound of formula N where both R 1 and R 2 are amme groups can be used to prepare the co ⁇ espondmg compound of formula N where both R 1 and R 2 are iodine or bromine via a diazotization reaction. Any conventional method of converting am o group to an lodo or bromo group (see for example, Lucas, H. J.; Kennedy, E. R. Org. Synth. Coll. Vol, II 1943, 351) can be utilized to effect this conversion. If it is desired to produce compounds of formula V, where both R 1 and R 2 are lower alkyl thio or perfluoro-lower alkyl thio groups, the compound of formula N where R 1 and R 2 are ammo can be used as starting matenal.
  • Any conventional method of converting aryl am o group to aryl thioalkyl group can be utilized to effect this conversion. If it is desired to produce compounds of formula N where R 1 and R " are lower alkyl sulfonyl or lower perfluoro alkyl sulfonyl, the co ⁇ espondmg compounds of formula N where R and R are lower alkyl thio or perfluoro-lower alkyl thio can be used as starting matenal. Any conventional method of oxidizing alkyl thio substituents to sulfones can be utilized to effect this conversion.
  • the co ⁇ esponding halo substituted compounds of formula N can be used as starting mate ⁇ als. Any conventional method of converting an aromatic halo group to the co ⁇ espondmg alkyl or perfluoro- lower alkyl group can be utilized to effect this conversion.
  • R" are substituted with sulfonamido
  • the co ⁇ esponding compounds where one or both of R 1 and R 2 are substituted with nitro can be used as starting mate ⁇ als. Any standard method of converting a nitrophenyl compound to the corresponding sulfonamidophenyl compound can be used to effect this conversion.
  • the co ⁇ esponding compound where one of R 1 and R 2 is nitro and the other is lower alkyl thio or perfluoro- lower alkyl thio can be used as starting matenals. Any conventional method of reducing an aromatic nitro group to an am e can be utilized to effect this conversion.
  • the compound of formula V where one of R 1 and R 2 is nitro and other is chloro can be used as a starting matenal.
  • the chloro substituent on the phenyl nng can be converted to an lodo substituent (see for example, Bunnett, J. F.; Conner, R M.; Org. Synth. Coll Vol V, 1973, 478; Clark, J. H.; Jones, C. W. J. Chem. Soc. Chem. Commun.
  • the compound of formula N where one of R 1 and R 2 is cyano and the other is amino can be used as a starting matenal
  • the ammo group is converted to cyano by conventional means of converting aryl-amino to aryl-cyano, for example by diazotization with a cyanide-transfemng agent such as cuprous cyanide
  • the nitro group is converted to an ammo group as descnbed above
  • this compound can be formed from the co ⁇ esponding compound where R 1 and R 2 is an ammo group by converting the amino group to a diazonium salt reacting the diazonium salt with a hydrohahc acid to form the co ⁇ espondmg halide and then reacting this halide with a Gngnard reagent to produce the co ⁇ espondmg acid which can be este ⁇ fied
  • R 1 and R 2 are carboxylic acid groups
  • This compound can be produced as descnbed above from the co ⁇ esponding compound of formula V where both R 1 and R 2 are ammo groups
  • the ammo groups m the compound of formula V can be converted to the corresponding compound where R 1 or both of R 1 or R 2 is -OR 5 by simply reacting the ammo group with sodium nitrate in
  • the alkyl halide of formula VI is reacted with the compound of formula N, to produce the compound of formula NH.
  • R 1 or R 2 is an ammo group, such ammo group(s) have to be protected before carrying out the alkylation reaction with the alkyl halide of formula VI
  • the ammo group can be protected with any conventional acid removable group (for example, for t-butyloxycarbonyl group see, Bodanszky, M. Principles of Peptide Chemistry, Springer -Verlag, New York, 1984, p 99).
  • the protecting group has to be removed from the amino groups after prepa ⁇ ng the co ⁇ esponding amme protected compounds of formulae I-a, I-b, I-c or I-d to obtain the co ⁇ esponding amines
  • the compound of formula N is an organic acid having an alpha carbon atom and the compound of formula VI is an alkyl halide so that alkylation occurs at the alpha carbon atom of this carboxylic acid This reaction is earned out by any conventional means of alkylation of the alpha carbon atom of a lower alkyl ester of a carboxylic acid. Generally, m these alkylation reactions any alkyl halide is reacted with the anion generated from any acetic acid ester.
  • the anion can be generated by using a strong organic base such as lithium dusopropylamide, n-butyl lithium as well as other organic lithium bases.
  • a strong organic base such as lithium dusopropylamide, n-butyl lithium as well as other organic lithium bases.
  • low boiling ether solvents are utilized such as tetrahydrofuran at low temperatures from -80°C to about -10°C being preferred. However, any temperature from -80°C to room temperature can be used.
  • the compound of formula N ⁇ can be converted to the compound of formula XII by any conventional procedure to convert a carboxylic acid ester to an acid.
  • the compound of formula XU can then be condensed with the compound of formula VIE via conventional peptide coupling to produce the compound of formula I-d.
  • any conventional method of condensing a p ⁇ mary amine with a carboxylic acid can be utilized to effect this conversion.
  • the required ammo heteroaromatic compounds of formula Nm are commercially available or can be prepared from the reported literature.
  • the heteroaromatics of formula Nm, wherein one of the substituents is -COCOOR 8 can be prepared from the co ⁇ espondmg halogen.
  • Any conventional acylation method to convert an aromatic or heteroaromatic halogen to its oxoacetic acid lower ester de ⁇ vative can be utilized.
  • the carboxylic acid of the formula Xu can be converted to the amide of the formula IX.
  • This reaction is earned out by using conventional means for converting the acid of formula Xu to an acid chlonde and thereafter treating this acid chlonde with ammonia or an ammonia-producmg compound such as hexamethyl disilazane.
  • Conditions which are conventional for converting an acid to an acid chlo ⁇ de can be utilized in this procedure. This acid chlo ⁇ de when reacted under conventional conditions with ammonia as desc ⁇ bed will produce the amide of formula IX.
  • the compound of formula IX when reacted with an alkyl, alkenyl, or -(CH 2 ) n C(O)OR 5 isocyanate of formula X forms the urea adduct of formula I-a.
  • Any conventional method ooff rreeaaccttiinngg aallkkyyll,, aallkkeennyyll,, oorr --((CCHH 22 )) ⁇ CC((OO))OORR 55 iissooccyyaannaattee v with an amide to form a urea linkage can be utilized to form the compound of formula I-a.
  • R 41 is a lower alkenyl group in the compound of formula I-a
  • this compound can be converted to the corresponding hydroxy lower alkyl group by conventional hydroboration at the olefinic group to produce a co ⁇ esponding hydroxy group
  • the hydroxy group if desired, can be converted to a halo group Any method of halogenating a hydroxy group can be used in accordance with this invention
  • the compound of formula I-c, I e the compound of formula I wherein R 4 -C(O)NHR 40 and R 40 is -CO-(CH 2 ) n -C(O)OR°, is produced from the monoacid chlo ⁇ de XIH of the monoester of the co ⁇ espondmg dicarboxy c acid
  • the monoacid chlo ⁇ de Xi ⁇ is coupled with the compounds of formula I-b using standard coupling methods
  • the compound of formula VII has an asymmet ⁇ c carbon atom through which the group -CH 2 R 3 and the acid amide substituents are connected
  • the prefe ⁇ ed stereoconfiguration of this group is R
  • this compound can be separated into these isomers by any conventional chemical means
  • any conventional optically active base can be utilized to carry out this resolution
  • the preferred optically active bases are the optically active amine bases such as alpha-methylbenzylamme, quinine, dehydroabietylamine and alpha- methylnaphthylamine Any of the conventional techniques utilized in resolving organic acids with optically active organic am e bases can be utilized in carrying out this reaction
  • the compound of formula Xu is reacted with the optically active base m an inert organic solvent medium to produce salts of the optically active amine with both the R and S isomers of the compound of formula XU
  • temperatures and pressure are not critical and the salt formation can take place at room temperature and atmospheric pressure.
  • the R and S salts can be separated by any conventional method such as fractional crystallization. After crystallization, each of the salts can be converted to the respective compounds of formula XII in the R and S configuration by hydrolysis with an acid.
  • prefe ⁇ ed acids are dilute aqueous acids, i.e., from about 0.001N to 2N aqueous acids, such as aqueous sulfuric or aqueous hydrochloric acid.
  • aqueous acids such as aqueous sulfuric or aqueous hydrochloric acid.
  • the configuration of formula XII which is produced by this method of resolution is carried out throughout the entire reaction scheme to produce the desired R or S isomer of formula I.
  • the separation of R and S isomers can also be achieved using an enzymatic ester hydrolysis of any lower alkyl esters co ⁇ esponding to the compound of the formula XU (see for example, Ahmar, M.; Girard, C; Bloch, R, Tetrahedron Lett, 1989, 7053), which results in the formation of co ⁇ esponding chiral acid and chiral ester.
  • the ester and the acid can be separated by any conventional method of separating an acid from an ester.
  • the prefe ⁇ ed method of resolution of racemates of the compounds of the formula XU is via the formation of corresponding diastereomeric esters or amides.
  • diastereomeric esters or amides can be prepared by coupling the carboxylic acids of the formula XU with a chiral alcohol, or a chiral amine. This reaction can be carried out using any conventional method of coupling a carboxylic acid with an alcohol or an amine. The co ⁇ esponding diastereomers of compounds of the formula XJJ can then be separated using any conventional separation methods. The resulting pure diastereomeric esters or amides can then be hydrolyzed to yield the co ⁇ esponding pure R or S isomers. The hydrolysis reaction can be carried out using conventional known methods to hydrolyze an ester or an amide without racemization.
  • the compounds of formula I are glucokinase activators useful for increasing insulin secretion.
  • the following compounds were tested and found to have excellent glucokinase activator in vivo activity when administered orally in accordance with the assay desc ⁇ bed in Example B
  • the compounds of formula I can be used as medicaments for the treatment of type II diabetes. Therefore, as mentioned earlier, medicaments containing a compound of formula I are also an object of the present invention, as is a process for the manufacture of such medicaments, which process compnses bnngmg one or more compounds of formula I and, if desired, one or more other therapeutically valuable substances into a galenical administration form.
  • compositions may be administered orally, for example m the form of tablets, coated tablets, dragees, hard or soft gelatine capsules, solutions, emulsions or suspensions. Administration can also be earned out rectally, for example using suppositones; locally or percutaneously, for example using ointments, creams, gels or solutions; or parenterally, e.g. intravenously, intramuscularly, subcutaneously, intrathecally or transdermally, using for example injectable solutions.
  • administration can be carried out sublingually or as an aerosol, for example in the form of a spray
  • the compounds of the present invention may be admixed with pharmaceutically inert, inorganic or organic excipients.
  • excipients for tablets, dragees or hard gelatine capsules include lactose, maize starch or denvatives thereof, talc or stearic acid or salts thereof
  • suitable excipients for use with soft gelatine capsules include for example vegetable oils, waxes, fats, semi-solid or liquid polyols etc.; according to the nature of the active ingredients it may however be the case that no excipient is needed at all for soft gelatine capsules
  • excipients which may be used include for example water, polyols, saccharose, invert sugar and glucose
  • excipients which may be used include for example water, alcohols, polyols, glyce ⁇ ne, and vegetable oils
  • excipients which may be used include for example natural or hardened oils, waxes, fats and semi-solid or liquid polyols.
  • compositions may also contain preserving agents, solubihsmg agents, stabilising agents, wetting agents, emulsifiers, sweeteners, colorants, odorants, salts for the vanation of osmotic pressure, buffers, coating agents or antioxidants As mentioned earlier, they may also contain other therapeutically valuable agents. It is a prerequisite that all adjuvants used in the manufacture of the preparations are non-toxic
  • Preferred forms of use are intravenous, intramuscular or oral administration, most prefe ⁇ ed is oral administration
  • the dosages in which the compounds of formula (I) are administered in effective amounts depend on the nature of the specific active ingredient, the age and the requirements of the patient and the mode of application. In general, dosages of about 1-100 mg/kg body weight per day come into consideration
  • the resulting reaction mixture was sti ⁇ ed at -78°C for 30 mm and then treated dropwise with a solution of 4-bromophenylacet ⁇ c acid (5.62 g, 26.13 mmol) in dry tetrahydrofuran (23 mL) and l,3-d ⁇ methyl-3,4,5,6-tetrahydro-2(lH)-pynm ⁇ dmone (10 mL)
  • the reaction mixture turned dark m color and was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (5.76 g, 27.44 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • reaction mixture was allowed to warm to 25°C where it was stirred for 24 h.
  • the reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran.
  • the aqueous residue was acidified using a 10% aqueous hydrochlonc acid solution.
  • the resulting aqueous layer was extracted with ethyl acetate (2 x 100 mL).
  • the brown reaction mixture was then treated with 2-aminothiazole (4.98 g, 49.69 mmol). The resulting reaction mixture was sti ⁇ ed at 25°C for 19 h. The reaction mixture was then concentrated in vacuo to remove methylene chloride. The remaining black residue was diluted with a 10% aqueous hydrochloric acid solution (400 mL) and then extracted with ethyl acetate (3 x 200 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo.
  • the product was extracted into methylene chlonde (3 x 25 mL), washed with a saturated aqueous sodium chlonde solution (2 x 25 mL), dned over sodium sulfate, filtered, and concentrated in vacuo to give 3-cyclopentyl-2-(3-n ⁇ tro-phenyl)-prop ⁇ on ⁇ c acid (0 48 g, 91.9%) as a tan solid- mp 95-99°C; EI-HRMS m/e calcd for C ⁇ 4 H, 7 NO 4 (M + ) 263.1157, found 263.1156
  • reaction was warmed to 25°C and sti ⁇ ed at 25°C for 16 h.
  • the reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chlo ⁇ de solution (20 mL). This mixture was poured into water (100 mL) and extracted with ethyl acetate (3 x 50 mL).
  • reaction was warmed to 25°C and sti ⁇ ed at 25°C for 16 h.
  • the reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chlo ⁇ de solution (20 mL). This mixture was poured into water (100 mL) and extracted with ethyl acetate (3 x 50 mL).
  • the reaction was then warmed to 25°C and was sti ⁇ ed at 25°C for 16 h.
  • the reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (10 mL). The excess solvent was removed in vacuo.
  • the mixture was then poured into water (150 mL) and extracted with ethyl acetate (3 x 100 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was then treated with a solution of 2- aminothiazole (142 mg, 1.42 mmol) in tetrahydrofuran (3.23 mL) and N,N- diisopropylethylamine (0.27 mL, 1.55 mmol).
  • the solution was sti ⁇ ed at 25°C for 5 h. At this time, the reaction was concentrated in vacuo.
  • the resulting reaction mixture was sti ⁇ ed at -78°C for 30 min and then treated dropwise with a solution of 4-(methylthio)phenylacetic acid (2.01 g, 11.03 mmol) m dry tetrahydrofuran (10.3 mL) and l,3-d ⁇ methyl-3,4,5,6-tetrahydro-2(lH)- pynmidinone (3 4 mL)
  • the reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (2.55 g, 12.13 mmol) in a small amount of dry tetrahydrofuran was added dropwise
  • the reaction mixture was sti ⁇ ed at - 78°C for 30 min and then allowed to warm to 25°C where it was stirred for 24 h
  • the reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran
  • the remaining aqueous phase was
  • the resulting reaction mixture was stirred at -78°C for 30 min and then treated dropwise with a solution of 4-(tnfluoromethylth ⁇ o)phenylacet ⁇ c acid (1.89 g, 8 00 mmol) m dry tetrahydrofuran (7.5 mL) and l,3-d ⁇ methyl-3,4,5,6-tetrahydro-2(lH)- py ⁇ midmone (2.5 mL)
  • the reaction mixture was allowed to stir at -78°C for 55 mm, at which time, a solution of lodomethylcyclopentane (1.85 g, 8.80 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • the reaction mixture was allowed to warm to 25°C where it was sti ⁇ ed for 41 h.
  • the reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran.
  • the organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo.
  • the resulting reaction mixture was sti ⁇ ed at 25°C for 18 h.
  • the reaction mixture was then concentrated in vacuo to remove methylene chlonde.
  • the remaining residue was diluted with ethyl acetate (50 mL).
  • the organic layer was washed with a 10% aqueous hydrochlonc acid solution (1 x 50 mL), washed with a saturated aqueous sodium bicarbonate solution (1 x 50 mL), washed with water (1 x 50 mL), dned over sodium sulfate, filtered, and concentrated in vacuo.
  • the resulting reaction mixture was sti ⁇ ed at -78°C for 30 mm and then treated dropwise with a solution of 4-(trifluoromethylth ⁇ o)phenylacet ⁇ c acid (1.89 g, 8.00 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-d ⁇ methyl-3,4,5,6-tetrahydro-2(lH)- py ⁇ midmone (2.5 mL).
  • the reaction mixture was allowed to stir at -78°C for 55 min, at which time, a solution of lodomethylcyclopentane (1.85 g, 8.80 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • the reaction mixture was allowed to warm to 25°C where it was sti ⁇ ed for 41 h.
  • the reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran.
  • the organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was sti ⁇ ed at 25°C for 17 h, at which time, thin layer chromatography showed the presence of two new lower R f products
  • An additional 2.00 g of 3- chloroperoxybenzoic acid was added to the reaction mixture to dnve the conversion of the sulfoxide to the sulfone, and the resulting reaction mixture was sti ⁇ ed at 25°C for 3 d
  • the reaction mixture was concentrated in vacuo to remove methylene chlo ⁇ de.
  • the combined organic layers were washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo to afford a cream solid.
  • reaction mixture turned deep yellow in color
  • the reaction mixture was then further stirred at -78°C for 30 mm, at which time, a solution of lodomethylcyclopentane (0.65 g, 3.09 mmol) in l,3-d ⁇ methyl-3,4,5,6-tetrahydro-2(lH)- pynmidone (1 mL) was added via sy ⁇ nge.
  • the reaction mixture was then allowed to warm to 25°C, where it was stirred for 16 h
  • the reaction mixture turned red in color du ⁇ ng this time penod
  • the reaction mixture was quenched with a 6N aqueous hydrochlonc acid solution (5 mL) and further diluted with water (20 mL).
  • reaction mixture was then washed with a 6 ⁇ aqueous hydrochloric acid solution (1 x 15 mL) and washed with a saturated aqueous sodium chloride solution (1 x 25 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was then sti ⁇ ed at -78°C for 50 mm, at which time, a solution of lodomethylcyclopentane (50.08 g, 0.24 mol) in a small amount of dry tetrahydrofuran was added slowly.
  • the reaction mixture was then sti ⁇ ed at -78°C for 50 mm, and then allowed to warm to 25°C, where it was stirred for 36 h.
  • the reaction mixture was quenched with water (100 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran The remaining residue was diluted with ethyl acetate (1.5 L).
  • the resulting reaction mixture was sti ⁇ ed at 0°C for 2 h and then cooled to -78°C for the addition of the freshly prepared chiral oxazolidmone.
  • the reaction mixture containing the oxazolidmone was then added to the cooled (-78°C) mixed anhyd ⁇ de solution
  • the resulting reaction mixture was sti ⁇ ed as -78°C for 1 h and allowed to gradually warm to 25°C.
  • the reaction mixture was then sti ⁇ ed at 25°C for 3 d.
  • the resulting reaction mixture was quenched with water (100 mL) and then concentrated in vacuo to remove tetrahydrofuran.
  • aqueous solution of lithium hydroperoxide was freshly prepared from mixing a solution of anhydrous lithium hydroxide powder (707.3 mg, 16.86 mmol) m 5.27 mL of water with a 30% aqueous hydrogen peroxide solution (3.44 mL, 33.71 mmol).
  • This freshly prepared aqueous lithium hydroperoxide solution was cooled to 0°C and then slowly added to a cooled (0°C) solution of (4R, 2'R)-4-benzyl-3-[3-cyclopentyl-2-(4- methanesulfonylphenyl)prop ⁇ onyl]-oxazol ⁇ dm-2-one (3.84 g, 8.43 mmol) in tetrahydrofuran (33 mL) and water (11 mL).
  • reaction mixture was sti ⁇ ed 0°C for 1.5 h
  • the reaction mixture was then quenched with a 1.5N aqueous sodium sulfite solution (25 mL)
  • the reaction mixture was further diluted with water (300 mL)
  • the resulting aqueous layer was continuously extracted with diethyl ether until thm layer chromatography indicated the absence of the recovered chiral oxazolidmone in the aqueous layer
  • the organic extract was dned over sodium sulfate, filtered, and concentrated in vacuo to afford (2R)-3- cyclopentyl-2-(4-methanesulfonylphenyl)prop ⁇ omc acid as a white solid (2.23 g, 89%) which was used without further pu ⁇ fication Flash
  • the cooled purple reaction mixture was then treated with the (2R)-3-cyclopentyl-2-(4-methanesulfonylphenyl)prop ⁇ on ⁇ c acid (2.23 g, 7.52 mmol)
  • the resulting reaction mixture was then allowed to warm to 25°C over 45 mm, at which time, the reaction mixture was then treated with 2-am ⁇ noth ⁇ azole (1.88 g, 18.81 mmol)
  • the resulting reaction mixture was sti ⁇ ed at 25°C for 12 h.
  • the reaction mixture was then concentrated in vacuo to remove methylene chlo ⁇ de
  • the remaining black residue was diluted with ethyl acetate (300 mL) and then washed well with a 10% aqueous hydrochlonc acid solution (2 x 100 mL), a 5% aqueous sodium bicarbonate solution (3 x 100 mL), and a saturated aqueous sodium chloride solution (1 x 200 mL).
  • the organic layer was then dried over sodium sulfate, filtered, and concentrated in vacuo.
  • the pale yellow reaction mixture was stirred at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-n ⁇ trophenylacet ⁇ c acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 min penod.
  • the reaction mixture turned deep purple (almost black) m color.
  • the reaction mixture was then sti ⁇ ed at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21.8 mol) m a small amount of dry tetrahydrofuran was added dropwise.
  • reaction mixture was then stirred at -78°C and then allowed to warm to 25°C, where it was sti ⁇ ed for 48 h.
  • the reaction mixture was quenched with a saturated aqueous ammonium chlonde solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran.
  • the remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL).
  • the organic phase was washed with a saturated aqueous sodium chlo ⁇ de solution, d ⁇ ed over magnesium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was partitioned between water and ethyl acetate. A saturated aqueous sodium chlonde solution was added to break up the emulsions. The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo.
  • lodomethylcyclopentane (27.75 g, 132 1 mmol) was then added m hexamethylphosphoramide (27.75 mL) The mixture was sti ⁇ ed at -78°C for 4 h The reaction was then warmed to 25°C and was sti ⁇ ed at 25°C for 16 h.
  • reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chlonde solution (250 mL) This mixture was concentrated, diluted with water (250 mL), and extracted with ethyl acetate (3 x 300 mL) The organics were washed with a saturated aqueous lithium chlonde solution (2 x 250 mL), dned over magnesium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was stirred at 25°C for 5 h.
  • the reaction mixture was then poured into a 2 ⁇ aqueous hydrochlonc acid solution (25 mL) and extracted with ethyl acetate (3 x 25 mL).
  • the organic layers were combined and washed with water (1 x 75 mL), a saturated aqueous sodium bicarbonate solution (1 x 75 mL), a saturated aqueous sodium chloride solution (3 x 75 mL), dned over sodium sulfate, filtered and concentrated in vacuo.
  • lodomethylcyclopentane (4.64 g, 22.08 mmol) was then added in l,3-d ⁇ methyl-3,4,5,6- tetrahydro-2(lH)-pynm ⁇ dmone (4.64 mL).
  • the reaction mixture was sti ⁇ ed at -78°C for 4 h
  • the reaction was then warmed to 25°C and was sti ⁇ ed at 25°C for 48 h.
  • reaction mixture was sti ⁇ ed at 0°C for 15 mm and then at 25°C for 1 5 h
  • the reaction mixture was then treated with (2-ammo-th ⁇ azol-4-yl)-acet ⁇ c acid ethyl ester (409 mg, 2.2 mmol) and N,N-dnsopropylethylamine (0.5 mL, 2.4 mmol).
  • This solution was stirred at 25°C for 24 h. At this time, the reaction was concentrated in vacuo.
  • reaction mixture was then treated with 2-am ⁇ noth ⁇ azole-4-carboxyl ⁇ c acid methyl ester (181 mg, 1.15 mmol).
  • the resulting reaction mixture was stirred at 25°C for 15 h.
  • the crude reaction mixture was directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) to afford impure (2R)-2-[3-cyclopentyl-2-(3,4-d ⁇ chloro-phenyl)- prop ⁇ onylammo]-th ⁇ azole-4-carboxyhc acid methyl ester
  • the impure product was diluted with ethyl acetate and then washed with a saturated aqueous sodium bicarbonate solution.
  • the bnght yellow solution was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (11.17 g, 53.2 mmol) in hexamethylphosphoramide (10 mL) was added via a cannula. The reaction mixture was sti ⁇ ed at -78°C for 1 h.
  • reaction mixture was then allowed to warm to 25°C, where it was sti ⁇ ed for 14 h
  • the combined organic layers were dned over sodium sulfate, filtered, and concentrated in vacuo.
  • the reaction mixture was sti ⁇ ed at 0°C for 30 mm and then treated with a solution of 2-ammopynd ⁇ ne (78 mg, 0.83 mmol) and N,N-d ⁇ sopropylethylam ⁇ ne (0.16 mL, 0.95 mmol) in tetrahydrofuran (2 mL).
  • the resulting reaction mixture was sti ⁇ ed at 25°C for 14 h.
  • the reaction mixture was then diluted with water (10 mL) and extracted with methylene chlonde (2 x 15 mL). The combined organic layers were d ⁇ ed over sodium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was sti ⁇ ed at 0°C for 15 mm and then at 25°C for 1 h The reaction mixture was then treated with a solution of 2- ammopy ⁇ dine (207 mg, 2.2 mmol) in tetrahydrofuran (5 mL) and NN- diisopropylethylamme (0.42 mL, 2.5 mmol).
  • the resulting reaction mixture was stirred at -78°C for 30 min and then treated dropwise with a solution of 4-(methylthio)phenylacetic acid (2.01 g, 11.03 mmol) in dry tetrahydrofuran (10.3 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyrimidinone (3.4 mL).
  • the reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (2.55 g, 12.13 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • the reaction mixture was stirred at - 78°C for 30 min and then allowed to warm to 25°C where it was sti ⁇ ed for 24 h.
  • the reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran.
  • the organic layer was washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo.
  • the resulting reaction mixture was sti ⁇ ed at -78°C for 30 min and then treated dropwise with a solution of 4-(tnfluoromethylth ⁇ o)phenylacet ⁇ c acid (1.89 g, 8 00 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-d ⁇ methyl-3,4,5,6-tetrahydro-2(lH)- py ⁇ midmone (2.5 mL).
  • the reaction mixture was allowed to stir at -78°C for 55 m , at which time, a solution of lodomethylcyclopentane (1.85 g, 8.80 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • the reaction mixture was allowed to warm to 25°C where it was sti ⁇ ed for 41 h.
  • the reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran.
  • the organic layer was washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was then concentrated in vacuo to remove methylene chloride.
  • the remaining residue was diluted with ethyl acetate (50 mL).
  • the organic layer was washed with a 10% aqueous hydrochloric acid solution (1 x 50 mL), washed with a saturated aqueous sodium bicarbonate solution (1 x 50 mL), washed with water (1 x 50 mL), dried over sodium sulfate, filtered, and concentrated in vacuo.
  • Recrystalhzation from hexanes/methylene chlonde provided pure 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-py ⁇ d ⁇ n-2-yl-prop ⁇ onam ⁇ de (170 mg, 54%) as a white solid: mp 172-173°C; EI-HRMS m/e calcd for C 2 oH 2 N 2 O 3 S (M + ) 372.1508, found 372.1498.
  • the reaction mixture was allowed to warm to 25°C where it was stirred for 41 h.
  • the reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran
  • the organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo.
  • the pale yellow reaction mixture was sti ⁇ ed at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-n ⁇ trophenylacet ⁇ c acid methyl ester (5 00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 mm penod
  • the reaction mixture turned deep purple (almost black) in color.
  • reaction mixture was then stirred at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21 8 mol) in a small amount of dry tetrahydrofuran was added dropwise.
  • the reaction mixture was then sti ⁇ ed at -78°C and then allowed to warm to 25°C, where it was sti ⁇ ed for 48 h
  • the reaction mixture was quenched with a saturated aqueous ammonium chlo ⁇ de solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL).
  • reaction mixture was then treated with 6-ammon ⁇ cot ⁇ mc acid methyl ester (620 mg, 4.07 mmol) and pyndme (0.38 mL, 4.7 mmol), and the reaction mixture was allowed to stir at 25°C for 20 h.
  • the resulting reaction mixture was diluted with water (15 mL) and then extracted with methylene chlo ⁇ de (3 x 15 mL). The combined organic layers were d ⁇ ed over sodium sulfate, filtered, and concentrated in vacuo.
  • the product was extracted into chloroform/methanol (9:1, 3 x 25 mL), dned over sodium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was then treated with 5-benzyloxy-pyndm-2-ylam ⁇ ne (281 mg, 1.4 mmol) and N,N-d ⁇ sopropylethylam ⁇ ne (0.26 mL, 1 5 mmol)
  • the reaction mixture was sti ⁇ ed at 25°C for 16 h At this time, the reaction was concentrated in vacuo.
  • the resulting reaction mixture was stirred at 25°C for 1 h.
  • the crude reaction mixture was directly pu ⁇ fied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford impure 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-(5-methyl- py ⁇ dm-2-yl)-propionamide as a red solid.
  • the combined reaction was then sti ⁇ ed at -78°C for 15 min and then allowed to warm to 25°C where it was sti ⁇ ed for an additional 1.5 h. At this time, the reaction was quenched by the addition of a saturated aqueous sodium bisulfite solution (50 mL) and extracted with ethyl acetate (3 x 40 mL). The combined organic layers were washed with a saturated aqueous sodium bicarbonate solution (1 x 20 mL) and a saturated aqueous sodium chloride solution (1 x 20 mL), dried over sodium sulfate, filtered, and concentrated in vacuo.
  • reaction was quenched with a saturated aqueous sodium sulfite solution (16 mL) followed by the addition of a 0.5N aqueous sodium bicarbonate solution (50 mL).
  • a 0.5N aqueous sodium bicarbonate solution 50 mL.
  • the tetrahydrofuran was then removed in vacuo.
  • the residue was diluted with water (40 mL) and extracted with methylene chloride (3 x 20 mL).
  • reaction was stirred at 25°C for 20 h. At this time, the reaction was diluted with water (10 mL) and extracted with methylene chloride (3 x 10 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo.
  • the reaction mixture was partitioned between water and ethyl acetate.
  • the organic layer was washed with a IN aqueous hydrochlonc acid solution, washed with water, and washed with a saturated aqueous sodium chlonde solution.
  • reaction mixture was concentrated in vacuo to afford a yellow oil This yellow oil was dissolved m a small amount of methylene chlo ⁇ de and then slowly added to a solution of 3-am ⁇ no-5-methyl ⁇ soxazole (48.3 mg. 0 49 mmol) and t ⁇ ethylamme (68 mL, 0.49 mmol) in methylene chlonde (1.2 mL). The resulting reaction mixture was sti ⁇ ed at 25°C for 14 h. The reaction mixture was concentrated in vacuo to remove methylene chlo ⁇ de.
  • the organic layer was washed with a IN aqueous hydrochloric acid solution, washed with water, and washed with a saturated aqueous sodium chloride solution.
  • the organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo.
  • the reaction mixture was concentrated in vacuo to remove N,N-dimethylformamide.
  • the resulting residue was diluted with ethyl acetate (200 mL).
  • the organic layer was washed with a 10% aqueous hydrochloric acid solution and washed with a saturated aqueous sodium chloride solution.
  • the organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo.
  • the resulting residue was dissolved in a small amount of methylene chloride and was slowly added to a cooled (0°C) solution of 2-aminopyrimidine (67 mg, 0.70 mmol) in methylene chlonde (1 mL)
  • the resulting reaction mixture was stirred at 0°C for 30 m and then sti ⁇ ed at 25°C for 2 h
  • the reaction mixture was concentrated in vacuo to remove methylene chlonde
  • the resulting residue was diluted with water and extracted with ethyl acetate (3 x 50 mL) The combined organic extracts were washed with a saturated aqueous sodium chlonde solution.
  • the resulting reaction mixture was sti ⁇ ed at -78°C for 30 min and then treated dropwise with a solution of 4-(methylthio)phenylacetic acid (2.01 g, 11.03 mmol) in dry tetrahydrofuran (10.3 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyrimidinone (3.4 mL).
  • the reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (2.55 g, 12.13 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • reaction mixture was sti ⁇ ed at - 78°C for 30 min and then allowed to warm to 25°C where it was stirred for 24 h.
  • the reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran.
  • the organic layer was washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was then concentrated in vacuo to remove methylene chlonde.
  • the remaining residue was diluted with water and ethyl acetate
  • the organic layer was washed with a IN aqueous hydrochlonc acid solution, washed with a saturated aqueous sodium bicarbonate solution, d ⁇ ed over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) afforded crude 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)- ⁇ -th ⁇ azol-2-yl- propionamide as a yellow solid.
  • the reaction mixture was allowed to stir at -78°C for 55 mm, at which time, a solution of lodomethylcyclopentane (1.85 g, 8.80 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • the reaction mixture was allowed to warm to 25°C where it was stirred for 41 h.
  • the reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran.
  • reaction mixture was stirred at 25°C for 17 h, at which time, thin layer chromatography showed the presence of two new lower R f products
  • An additional 2.00 g of 3- chloroperoxybenzoic acid was added to the reaction mixture to dnve the conversion of the sulfoxide to the sulfone, and the resulting reaction mixture was stirred at 25°C for 3 d.
  • the reaction mixture was concentrated in vacuo to remove methylene chlonde.
  • the pale yellow reaction mixture was stirred at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-n ⁇ trophenylacet ⁇ c acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 mm penod.
  • the reaction mixture turned deep purple (almost black) in color.
  • the reaction mixture was then stirred at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21.8 mol) a small amount of dry tetrahydrofuran was added dropwise.
  • reaction mixture was then sti ⁇ ed at -78°C and then allowed to warm to 25°C, where it was sti ⁇ ed for 48 h.
  • the reaction mixture was quenched with a saturated aqueous ammonium chlo ⁇ de solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL).
  • the organic phase was washed with a saturated aqueous sodium chlonde solution, dned over magnesium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was then treated with 2- ammothiazole (74 mg, 0.739 mmol).
  • the resulting reaction mixture was stirred at 25°C for 15 h.
  • the crude reaction mixture was treated with a solution of hexanes/ethyl acetate (2 mL, 3:1) and then directly punfied by flash chromatography (Merck Silica gel 60, 230- 400 mesh, 3/1 hexanes/ethyl acetate).
  • the pale yellow reaction mixture was sti ⁇ ed at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-n ⁇ trophenylacet ⁇ c acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 mm penod
  • the reaction mixture turned deep purple (almost black) in color.
  • the reaction mixture was then stirred at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21.8 mol) in a small amount of dry tetrahydrofuran was added dropwise.
  • reaction mixture was then sti ⁇ ed at -78°C and then allowed to warm to 25°C, where it was sti ⁇ ed for 48 h.
  • the reaction mixture was quenched with a saturated aqueous ammonium chlonde solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran.
  • the remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL).
  • the organic phase was washed with a saturated aqueous sodium chlonde solution, dned over magnesium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was then treated with 2- ammopy ⁇ dme (70 mg, 0.739 mmol).
  • the resulting reaction mixture was sti ⁇ ed at 25°C for 15 h
  • the crude reaction mixture was treated with a solution of hexanes/ethyl acetate (2 mL, 3.1) and then directly punfied by flash chromatography (Merck Silica gel 60, 230- 400 mesh, 3/1 hexanes/ethyl acetate).
  • the pale yellow reaction mixture was stirred at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-mtrophenylacet ⁇ c acid methyl ester (5 00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 mm penod
  • the reaction mixture turned deep purple (almost black) in color.
  • the reaction mixture was then sti ⁇ ed at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21.8 mol) in a small amount of dry tetrahydrofuran was added dropwise.
  • reaction mixture was then sti ⁇ ed at -78°C and then allowed to warm to 25°C, where it was sti ⁇ ed for 48 h.
  • the reaction mixture was quenched with a saturated aqueous ammonium chlo ⁇ de solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL)
  • the organic phase was washed with a saturated aqueous sodium chlo ⁇ de solution, dned over magnesium sulfate, filtered, and concentrated in vacuo.
  • the pale yellow reaction mixture was stirred at -78°C for 20 min and then slowly treated with a solution of 4-chloro-3-nitrophenylacetic acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 min period.
  • the reaction mixture turned deep purple (almost black) in color.
  • the reaction mixture was then sti ⁇ ed at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (4.58 g, 21.8 mol) in a small amount of dry tetrahydrofuran was added dropwise.
  • reaction mixture was then stirred at -78°C and then allowed to wa ⁇ n to 25 °C, where it was sti ⁇ ed for 48 h
  • the reaction mixture was quenched with a saturated aqueous ammonium chlo ⁇ de solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran
  • the remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL)
  • the organic phase was washed with a saturated aqueous sodium chlo ⁇ de solution, d ⁇ ed over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(4-chloro-3-n ⁇ trophenyl)-3-cyclopentyl- propionic acid methyl ester (2 17 g, 32%) as a yellow oil EI
  • the resulting reaction mixture was sti ⁇ ed at 25°C for 15 h.
  • the crude reaction mixture was directly purified by flash chromatography, (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate), to afford 3-cyclopentyl-2-(4-methanesulfonyl- 3-nitrophenyl)- ⁇ -thiazol-2-yl-propionamide (96 mg, 52%) as a pale yellow solid: mp 121-124°C; FAB-HRMS m/e calcd for C 18 H 2I N 3 O 5 S 2 (M+H) + 424.1001, found 424.1000.
  • the pale yellow reaction mixture was stirred at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-n ⁇ trophenylacet ⁇ c acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 mm penod
  • the reaction mixture turned deep purple (almost black) in color.
  • the reaction mixture was then stirred at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21.8 mol) in a small amount of dry tetrahydrofuran was added dropwise.
  • reaction mixture was then sti ⁇ ed at -78°C and then allowed to warm to 25°C, where it was sti ⁇ ed for 48 h.
  • the reaction mixture was quenched with a saturated aqueous ammonium chlonde solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL).
  • the resulting reaction mixture was stirred at -78°C for 30 mm and then treated dropwise with a solution of (3-t ⁇ fluoromethylsulfanyl-phenyl)-acet ⁇ c acid methyl ester (2.50 g, 10 0 mmol) in a small amount of tetrahydrofuran.
  • the reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (2.10 g, 10 0 mmol) m a small amount of dry tetrahydrofuran was added dropwise.
  • the reaction mixture was allowed to warm to 25°C where it was stirred for 15 h.
  • the reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (2.24 g, 10.67 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • the reaction mixture was allowed to warm to 25°C where it was stirred for 15 h.
  • the reaction mixture was quenched with a saturated aqueous ammonium chlo ⁇ de solution (10 mL) and then partitioned between water (75 mL) and ethyl acetate (75 mL). The layers were shaken and separated. The aqueous layer was further extracted with ethyl acetate (1 x 75 mL).
  • the resulting reaction mixture was stirred at -78°C for 45 min and then treated dropwise with a solution of (3-fluoro-4-trifluoromethyl-phenyl)-acetic acid methyl ester (2.40 g, 10.16 mmol) in a small amount of tetrahydrofuran.
  • the reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (2.24 g, 10.67 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • the reaction mixture was allowed to warm to 25°C where it was sti ⁇ ed for 15 h.
  • reaction mixture was quenched with a saturated aqueous ammonium chloride solution (10 mL) and then partitioned between water (75 mL) and ethyl acetate (75 mL). The layers were shaken and separated. The aqueous layer was further extracted with ethyl acetate (75 mL). The combined organic layers were washed with a saturated aqueous sodium chlo ⁇ de solution, dned over magnesium sulfate, filtered, and concentrated in vacuo.
  • reaction mixture was treated with more bromine (1.74 mL, 33.84 mmol) The reaction mixture was stirred an additional 4 h at 25°C and then quenched with a 10% aqueous sodium bisulfite solution (150 mL) The reaction mixture was concentrated in vacuo to remove carbon tetrachlonde The resulting aqueous layer was extracted with ethyl acetate (3 x 150 mL).
  • reaction mixture was then treated with 2- aminothiazole (117 mg, 1.17 mmol)
  • the resulting reaction mixture was sti ⁇ ed at 25°C for 15 h
  • the crude reaction mixture was then directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-N-th ⁇ azol-2-yl-prop ⁇ onarmde (214 mg, 88%) as a yellow solid, mp 106-107°C, EI-HRMS m/e calcd for C ⁇ 8 H 2 ⁇ BrN 2 O 3 S 2 (M + ) 456.0177, found 456 0175.
  • the resulting reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (5.59 g, 26.60 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • the reaction mixture was allowed to warm to 25°C where it was sti ⁇ ed for 15 h.
  • the reaction mixture was quenched with water (300 mL) and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was extracted with ethyl acetate (3 x 150 mL).
  • the reaction mixture was sti ⁇ ed at 25°C for 4 h, at which time, thin layer chromatography still indicated the presence of a substantial amount of starting material.
  • the reaction mixture was treated with more bromine (1.74 mL, 33.84 mmol).
  • the reaction mixture was sti ⁇ ed an additional 4 h at 25°C and then quenched with a 10% aqueous sodium bisulfite solution (150 mL).
  • the reaction mixture was concentrated in vacuo to remove carbon tetrachloride.
  • the resulting aqueous layer was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo.
  • the resulting reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (5.59 g, 26.60 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • the reaction mixture was allowed to warm to 25°C where it was sti ⁇ ed for 15 h.
  • the reaction mixture was quenched with water (300 mL) and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was extracted with ethyl acetate (3 x 150 mL).
  • reaction mixture was sti ⁇ ed at 0°C for 15 mm and then treated with 2-(3-cyano-4- methanesulfonyl-phenyl)-3-cyclopentyl-prop ⁇ on ⁇ c acid (100 mg, 0.31 mmol).
  • the resulting reaction mixture was stirred at 0°C for 5 mm and then allowed to warm to 25°C where it was stirred for 30 mm.
  • the reaction mixture was then treated with 2- ammothiazole (68 mg, 0.68 mmol)
  • the resulting reaction mixture was sti ⁇ ed at 25°C for 15 h.
  • the crude reaction mixture was then directly punfied by flash chromatography
  • reaction mixture was sti ⁇ ed at -78°C for 30 min and then treated dropwise with a solution of (3-bromo-4-methylsulfanyl-phenyl)-acetic acid methyl ester (6.10 g, 22.17 mmol) in dry tetrahydrofuran (21 mL) and l,3-dimethyl-3,4,5,6-tetrahydro- 2(lH)-pyrimidinone (7 mL). The resulting reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (5.59 g, 26.60 mmol) in a small amount of dry tetrahydrofuran was added dropwise.
  • reaction mixture was allowed to warm to 25°C where it was sti ⁇ ed for 15 h.
  • the reaction mixture was quenched with water (300 mL) and then concentrated in vacuo to remove tetrahydrofuran.
  • the remaining aqueous phase was extracted with ethyl acetate (3 x 150 mL).
  • the combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo.
  • the resulting reaction mixture was allowed to warm to 25°C where it was sti ⁇ ed for 20 h.
  • the reaction mixture was concentrated in vacuo to remove tetrahydrofuran and then diluted with water (300 mL).
  • the aqueous layer was extracted with ethyl acetate (3 x 200 mL).
  • the resulting reaction mixture was allowed to warm to 25°C where it was stirred for 20 h.
  • the reaction mixture was concentrated in vacuo to remove tetrahydrofuran and then diluted with water (300 mL).
  • the aqueous layer was extracted with ethyl acetate (3 x 200 mL).
  • the combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo.

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Abstract

The present invention relates to compounds of formula (I) wherein R?1, R2, R3 and R4¿ are as defined in claim 1 and pharmaceutically acceptable salts thereof. The compounds are glucokinase activators which increase insulin secretion in the treatment of type II diabetes.

Description

Glucokinase activators
Glucokinase (GK) is one of four hexokinases that are found in mammals [Colowick, S.P., in The Enzymes, Nol. 9 (P. Boyer, ed.) Academic Press, New York, NY, pages 1-48, 1973]. The hexokinases catalyze the first step in the metabolism of glucose, i.e., the conversion of glucose to glucose-6-phosphate. Glucokinase has a limited cellular distribution, being found principally in pancreatic β-cells and liver parenchymal cells. In addition, GK is a rate-controlling enzyme for glucose metabolism in these two cell types that are known to play critical roles in whole-body glucose homeostasis [Chipkin, S.R., Kelly, K.L., and Ruderman, N.B. in Joslin 's Diabetes (CR. Khan and G.C. Wier, eds.), Lea and Febiger, Philadelphia, PA, pages 97-115, 1994]. The concentration of glucose at which GK demonstrates half-maximal activity is approximately 8 mM. The other three hexokinases are saturated with glucose at much lower concentrations (<1 mM). Therefore, the flux of glucose through the GK pathway rises as the concentration of glucose in the blood increases from fasting (5 mM) to postprandial (=10-15 mM) levels following a carbohydrate-containing meal [Printz, R.G., Magnuson, M.A., and Granner, D.K. in Ann. Rev. Nutrition Vol. 13 (R.E. Olson, D.M. Bier, and D.B. McCormick, eds.), Annual Review, Inc., Palo Alto, CA, pages 463-496, 1993]. These findings contributed over a decade ago to the hypothesis that GK functions as a glucose sensor in β-cells and hepatocytes (Meglasson, M.D. and Matschinsky, F.M. Amer. J. Physiol. 246, E1-E13, 1984). In recent years, studies in transgenic animals have confirmed that GK does indeed play a critical role in whole-body glucose homeostasis. Animals that do not express GK die within days of birth with severe diabetes while animals overexpressing GK have improved glucose tolerance (Grupe, A., Hultgren, B., Ryan, A. et al, Cell 83, 69-78, 1995; Feme, T., Riu, E., Bosch, F. et al., FASEB J., 10, 1213-1218, 1996). An increase in glucose exposure is coupled through GK in β-cells to increased insulin secretion and in hepatocytes to increased glycogen deposition and perhaps decreased glucose production. The finding that type -Q maturity-onset diabetes of the young (MODY-2) is caused by loss of function mutations in the GK gene suggests that GK also functions as a glucose sensor in humans (Liang, Y , Kesavan, P , Wang, L et al , Biochem J 309, 167-173, 1995) Additional evidence supporting an important role for GK in the regulation of glucose metabolism in humans was provided by the identification of patients that express a mutant form of GK with increased enzymatic activity These patients exhibit a fasting hypoglycemia associated with an inappropriately elevated level of plasma msulin (Glaser, B , Kesavan, P , Heyman, M et al , New England J Med 338, 226-230, 1998) While mutations of the GK gene are not found m the majoπty of patients with type II diabetes, compounds that activate GK and, thereby, increase the sensitivity of the GK sensor system will still be useful in the treatment of the hyperglycemia characteristic of all type π diabetes Glucokinase activators will increase the flux of glucose metabolism in β-cells and hepatocytes, which will be coupled to increased msulin secretion Such agents would be useful for treating type II diabetes
This invention provides a compound, composing an amide of the formula I
Figure imgf000004_0001
wherein
R1 and R2 are independently hydrogen, halo, ammo, hydroxyammo, nitro, cyano, sulfonamido, lower alkyl, -OR5, -C(O)OR5, perfluoro-lower alkyl, lower alkyl thio, perfluoro-lower alkyl thio, lower alkyl sulfonyl, perfluoro-lower alkyl sulfonyl or lower alkyl sulf yl,
RJ is cycloalkyl having from 3 to 7 carbon atoms or lower alkyl having from 2 to 4 carbon atoms, R4 is -C(O)NHR40; or an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six-membered heteroaromatic ring contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom; said mono- substituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of lower alkyl, halo, nitro, cyano, -(CH2)n-OR6, -(CH2)n-C(O)OR7, -(CH2)n-C(O)NHR6, -C(O)-C(O)OR8, -(CH2)n-NHR6; R is hydrogen, lower alkyl, lower alkenyl, hydroxy lower alkyl, halo lower alkyl,
-(CH2)n-C(0)OR5 or -C(O)-(CH2)n-C(O)OR6;
R3 is hydrogen, lower alkyl or perfluoro-lower alkyl;
R6, R7 and R8 are independently hydrogen or lower alkyl; and
Figure imgf000005_0001
or a pharmaceutically acceptable salt thereof.
In the compound of formula I, the * indicates the asymmetric carbon atom in this compound. The compound of formula I may be present either as a racemate or in the "R" configuration at the asymmetric carbon shown. The "R" enantiomers are preferred.
The compounds of formula I have been found to activate glucokinase in vitro. Glucokinase activators are useful for increasing insulin secretion in the treatment of type II diabetes.
The present invention also relates to a pharmaceutical composition comprising a compound of formula I and a pharmaceutically acceptable carrier and/or adjuvant. Furthermore the present invention relates to the use of such compounds for the preparation of medicaments for the treatment of type II diabetes. The present invention also relates to processes for the preparation of the compounds of formula I. In addition, the present invention relates to a method for the therapeutic treatment of type II diabetes, which method compnses administering a compound of formula I to a human being or an animal
As used throughout this application, the term "halogen" and the term "halo", unless otherwise stated, designate all four halogens, i.e fluorine, chloπne, bromine and iodine A preferred halogen is chloπne. As used herein, the term "lower alkyl" includes both straight chain and branched chain alkyl groups having from 1 to 7 carbon atoms, such as methyl, ethyl, propyl, isopropyl, preferably methyl and ethyl. With regard to RJ, isopropyl and n-propyl are prefeπed "Halo lower alkyl" as used herein designates a lower alkyl group wherein one of the hydrogens is replaced by a halogen as defined above, which replacement can be at any site on the lower alkyl, including the end. A preferred halo lower alkyl group is chloroethyl Similarly, "hydroxy lower alkyl" designates a lower alkyl group where one of the hydrogens is replaced by a hydroxy, at any site including the end. Preferred hydroxy lower alkyl groups include ethanol, isopropanol, and n-propanol. As used herein, "perfluoro-lower alkyl" means any lower alkyl group wherein all of the hydrogens of the lower alkyl group are substituted or replaced by fluoro Among the prefeπed perfluoro- lower alkyl groups are tπfluoromethyl, pentafluoroethyl, heptafluoropropyl, etc.
As used herein, "lower alkyl thio" means a lower alkyl group as defined above where a thio group is bound to the rest of the molecule Similarly "perfluoro-lower alkyl thio" means a perfluoro-lower alkyl group as defined above where a thio group is bound to the rest of the molecule
As used herein, "lower alkyl sulfonyl" means a lower alkyl group as defined above where a sulfonyl group is bound to the rest of the molecule. Similarly "perfluoro-lower alkyl sulfonyl" means a perfluoro-lower alkyl group as defined above where a sulfonyl group is bound to the rest of the molecule. As used herein, "lower alkyl sulfinyl" means a lower alkyl group as defined above where a sulfinyl group is bound to the rest of the molecule.
As used herein, "hydroxyamino" designates an amino group where one of the hydrogens is replaced by a hydroxy. As used herein, "cycloalkyl" means a saturated hydrocarbon ring having from 3 to
10 carbon atoms, preferably from 3 to 7 carbon atoms, such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, etc. A preferred cycloalkyl is cyclopentyl.
As used herein, the term "lower alkenyl" denotes an alkylene group having from 2 to 6 carbon atoms with a double bond located between any two adjacent carbons of the group. Preferred lower alkenyl groups are allyl and crotyl.
As used herein, the term "lower alkoxy" includes both straight chain and branched chain alkoxy groups having from 1 to 7 carbon atoms, such as methoxy, ethoxy, propoxy, isopropoxy, preferably methoxy and ethoxy.
As used herein, the term "aryl" signifies aryl mononuclear aromatic hydrocarbon groups such as phenyl, tolyl, etc. which can be unsubstituted or substituted in one or more positions with halogen, nitro, lower alkyl, or lower alkoxy substituents and polynuclear aryl groups, such as naphthyl, anthryl, and phenanthryl, which can be unsubstituted or substituted with one or more of the aforementioned groups. Prefeπed aryl groups are the substituted and unsubstituted mononuclear aryl groups, particularly phenyl. The term "arylalkyl" denotes an alkyl group, preferably lower alkyl, in which one of the hydrogen atoms is replaced by an aryl group. Examples of arylalkyl groups are benzyl, 2- phenylethyl, 3-phenylpropyl, 4-chlorobenzyl, 4-methoxybenzyland the like.
As used herein, the term "lower alkanoic acid" denotes lower alkanoic acids containing from 2 to 7 carbon atoms such as propionic acid, acetic acid and the like. The term "lower alkanoyl" denotes monovalent alkanoyl groups having from 2 to 7 carbon atoms such as propionoyl, acetyl and the like. The term "aroic acids" denotes aryl alkanoic acids where aryl is as defined above and alkanoic contains from 1 to 6 carbon atoms. The term "aroyl" denotes aroic acids wherein aryl is as defined hereinbefore, with the hydrogen group of the COOH moiety removed Among the prefeπed aroyl groups is benzoyl
The heteroaromatic πng R4 can be an unsubstituted or mono-substituted five- or six-membered heteroaromatic nng having from 1 to 3 heteroatoms selected from the group consisting of oxygen, nitrogen or sulfur and connected by a πng carbon to the amme of the amide group shown The heteroaromatic πng contains a first nitrogen heteroatom adjacent to the connecting πng carbon atom and if present, the other heteroatoms can be sulfur, oxygen or nitrogen Such heteroaromatic πngs include, for example, pyrazinyl, pyπdazmyl, isoxazolyl, isothiazolyl, and pyrazolyl Among the preferred heteroaromatic πngs are included pyπdmyl, pyπmidinyl, thiazolyl, oxazolyl and lrmdazolyl These heteroaromatic πngs which constitute R4 are connected via a πng carbon atom to the amide group to form the amides of formula I The πng carbon atom of the heteroaromatic πng which is connected via the amide linkage to form the compound of formula I cannot contain any substituent When R4 is an unsubstituted or mono- substituted five-membered heteroaromatic πng, the preferred πngs are those which contain a nitrogen heteroatom adjacent to the connecting πng carbon and a second heteroatom adjacent to the connecting πng carbon or adjacent to said first heteroatom The prefeπed five-membered heteroaromatic πngs contain 2 or 3 heteroatom with thiazolyl, lmidazolyl, oxazolyl and thiadiazolyl being especially preferred When the heteroaromatic πng is a six-membered heteroaromatic, the πng is connected by a πng carbon to the amme group shown, with one nitrogen heteroatom being adjacent to the connecting πng carbon atom The preferred six-membered heteroaromatic πngs include, for example, pyπdinyl, pyπmidinyl, pyrazinyl, pyπdazmyl, and tnazmyl
Duπng the course of the reaction the vaπous functional groups such as the free carboxylic acid or hydroxy groups will be protected via conventional hydrolyzable ester or ether protecting groups As used herein the term "hydrolyzable ester or ether protecting groups" designates any ester or ether conventionally used for protecting carboxylic acids or alcohols which can be hydrolyzed to yield the respective hydroxyl or carboxyl group Exemplary ester groups useful for those purposes are those m which the acyl moieties are deπved from a lower alkanoic, aryl lower alkanoic, or lower alkane dicarboxcyc c acid Among the activated acids which can be utilized to form such groups are acid anhydπdes, acid halides, preferably acid chloπdes or acid bromides derived from aryl or lower alkanoic acids Example of anhydπdes are anhydπdes deπved from monocarboxy c acid such as acetic anhydπde, benzoic acid anhydπde, and lower alkane dicarboxcyclic acid anhydπdes, e g succmic anhydπde as well as chloro formates e g tπchloro, ethylchloro formate being preferred A suitable ether protecting group for alcohols are, for example, the tetrahydropyranyl ethers such as 4-methoxy-5,6-dιhydroxy- 2H-pyranyl ethers Others are aroylmethylethers such as benzyl, benzhydryl or tπtyl ethers or -lower alkoxy lower alkyl ethers, for example, methoxymethyl or allyhc ethers or alkyl silylethers such as tπmethylsilylether
The term "ammo protecting group" designates any conventional am o protecting group which can be cleaved to yield the free am o group The prefeπed protecting groups are the conventional ammo protecting groups utilized in peptide synthesis Especially preferred are those am o protecting groups which are cleavable under mildly acidic conditions from about pH 2 0 to 3 Particularly prefeπed ammo protecting groups are t-butoxycarbonyl (BOC), carbobenzyloxy (CBZ) and 9-flurorenylmethoxycarbonyl (FMOC)
The term "pharmaceutically acceptable salts" as used herein include any salt with both inorganic or organic pharmaceutically acceptable acids such as hydrochloπc acid, hydrobromic acid, mtπc acid, sulfuπc acid, phosphoπc acid, citπc acid, formic acid, maleic acid, acetic acid, succmic acid, tartaπc acid, methanesulfonic acid, αr -toluene sulfonic acid and the like The term "pharmaceutically acceptable salts" also includes any pharmaceutically acceptable base salt such as am e salts, tπalkyl am e salts and the like Such salts can be formed quite readily by those skilled in the art using standard techniques In one preferable embodiment, the present invention relates to a compound compnsmg an amide of the above formula I, wherein
R1 and R" are independently hydrogen, halo, ammo, hydroxyammo, cyano, nitro, lower alkyl, -OR5, -C(O)OR5, perfluoro-lower alkyl, lower alkyl thio, perfluoro- lower alkyl thio, lower alkyl sulfonyl, perfluoro-lower alkyl sulfonyl, lower alkyl sulfinyl, or sulfonamido,
RJ is cycloalkyl having from 3 to 7 carbon atoms,
R is an unsubstituted or mono-substituted five- or six-membered heteroaromatic πng connected by a πng carbon atom to the amme group shown, which five- or six- membered heteroaromatic πng contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting πng carbon atom; said mono-substituted heteroaromatic πng being monosubstituted at a position on a πng carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of lower alkyl, halo, nitro, cyano, -(CH2)n-OR6, -(CH2)n-C(O)OR7,
-(CH2)n-C(O)NHR6, -C(O)-C(O)OR8 or -(CH2)n-NHR6,
Figure imgf000010_0001
R3 is hydrogen, lower alkyl, or perfluoro-lower alkyl, and
R6, R7 and R8 are independently hydrogen or lower alkyl, or a pharmaceutically acceptable salt thereof
In another preferable emodiment the present invention relates to a compound compnsmg an amide of the above formula I, wherein
R! and R2 are independently hydrogen, halo, amino, nitro, cyano, sulfonamido, lower alkyl, perfluoro-lower alkyl, lower alkyl thio, perfluoro-lower alkyl thio, lower alkyl sulfonyl, or perfluoro-lower alkyl sulfonyl, RJ is cycloalkyl having from 3 to 7 carbon atoms or lower alkyl having from 2 to 4 carbon atoms;
Figure imgf000011_0001
R40 is hydrogen, lower alkyl, lower alkenyl, hydroxy lower alkyl, halo lower alkyl, -(CH2)n-C(O)OR5 or -C(O)-(CH2)n-C(O)OR6;
R3 and R6 are hydrogen or lower alkyl; and
Figure imgf000011_0002
or a pharmaceutically acceptable salt thereof
Preferable heteroaromatic residues in R4 are unsubstituted or mono-substituted five- or six-membered heteroaromatic πngs selected from the group consisting of thiazolyl, pyndinyl, imidazolyl, isoxazolyl, oxazolyl, pyπdazmyl, pyπmidinyl or thiadiazolyl Especially prefeπed are unsubstituted thiazolyl, unsubstituted pyndinyl or pyndinyl substituted by halogen, lower alkyl, hydroxy lower alkyl or -C(O)OR5, wherein R3 is lower alkyl.
Preferable residues R40 in accordance with the present invention are lower alkyl or lower alkenyl
Preferable residues R1 in accordance with the present invention are hydrogen, halo, nitro and cyano, more preferable are hydrogen or halo. Preferable residues R" m accordance with the present invention are hydrogen, lower alkyl sulfonyl, perfluoro-lower alkyl, perfluoro-lower alkyl sulfonyl, halo or -OR3 wherein R3 is perfluoro-lower alkyl; more preferable are halo or lower alkyl sulfonyl
Preferable residues RJ in accordance with the present invention are cyclopentyl, cyclohexyl or cycloheptyl, more preferable is cyclopentyl.
In the compounds descπbed below, unless otherwise indicated, R4 is a group -C(O)NHR40, wherein R40 is as defined above. In certain of such compounds, R40 of the amide is hydrogen, lower alkyl, or lower alkenyl. Such amides are prefeπed when RJ is cyclopentyl, especially when the amide is in the "R" configuration at the asymmetric carbon shown.
1 9
In certain amides of the above compound, R and R of the amide are hydrogen. Such an amide is l-(3-cyclopentyl-2-phenyl-propionyl)-3-methyl-urea. In other of the above compounds, one of R1 and R2 is hydrogen and the other is cyano or halo. Examples of such amides are: l-[2-(3-chloro-phenyl)-3 cyclopentyl-propionyl]-3-methyl-urea; l-[2-(4-chloro-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea; 1 -[2-(4-cyano-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea; l-[2-(4-bromo-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea.
In other amides of the above compound, R and R of the amide are each independently halo (preferably chloro). Examples of such amides are:
[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-urea; l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-methyl-urea; l-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-3-ethyl-urea; l-allyl-3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-proprionyl]-urea; l-allyl-3-[3-cyclopentyl-2(R)-(3, 4-dichloro-phenyl)-proprionyl]-urea; l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-ethyl-urea; l-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-3-methyl-urea; l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-isopropyl-urea; l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-propyl-urea; l-[3-cyclopentyl-2-(3,4-difluoro-phenyl)-propionyl]-3-methyl-urea.
1
In yet other amides of the above compound, one of R and R of the amide is hydrogen or halo and the other is nitro. Examples of such amides are: l-[2-(4-chloro-3-nitro-phenyl)-3-cyclopentyl-proprionyl]-3-methyl-urea; l-[3-cyclopentyl-2-(4-nitro-phenyl)-propionyl]-3-methyl-urea. In further amides of the above compound, one of R1 and R" is hydrogen, lower alkyl thio or perfluoro-lower alkyl thio and the other is lower alkyl thio or perfluoro-lower alkyl thio. Examples of such amides are: l-[3-cyclopentyl-2-(4-tπfluoromethylsulfanyl-phenyl)-propιonyl]-3-methyl urea; l-[3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-propιonyl]-3-methyl urea.
In yet further amides of the above compound, one of R1 and R2 is hydrogen or perfluoro-lower alkyl sulfonyl and the other is perfluoro-lower alkyl sulfonyl. Examples of such amides are l-[3-cyclopentyl-2-(4-tπfluoromethanesulfonyl-phenyl)-propιonyl]-3-methyl urea; l-[3-cyclopentyl-2-(3-tπfluoromethanesulfonyl-phenyl)-propιonyl]-3-methyl urea.
In certain amides of the above compound, at least one of R1 and R2 is lower alkyl sulfonyl. Preferably one of R1 and R2 is hydrogen or lower alkyl sulfonyl and the other is lower alkyl sulfonyl, and more preferably R" is lower alkyl sulfonyl. Examples of such amides are: l-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propιonyl]-3-methyl urea; l-{2-[4-(butane-l-sulfonyl)-phenyl]-3-cyclopentyl-propπonyl}-3-methyl-urea; l-[3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-propπonyl]-3-methyl-urea; l-[2-(3,4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl-propπonyl]-3-methyl-urea.
In other amides of the above compound, at least one of R1 and R2 is lower alkyl sulfonyl, one of R! and R2 is cyano or halo and the other, preferably R2, is lower alkyl sulfonyl. Examples of such amides are: l-[2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propπonyl]-3-methyl-urea; l-[3-cyclopentyl-2-(3-fluoro-4-methanesulfonyl-phenyl)-propπonyl]-3-methyl-urea; l-[2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propπonyl]-3-methyl-urea; l-[2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-proprionyl]-3-methyl-urea; l-[2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propπonyl]-3-ethyl-urea; l-[2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propπonyl]-3-methyl-urea.
In other amides of the above compound, at least one of R1 and R2 is lower alkyl
1 7 9 sulfonyl, one of R and R is perfluoro-lower alkyl and the other, preferably R , is lower alkyl sulfonyl. An Example of such an amide is l-[3-cyclopentyl-2-(4-methanesulfonyl- 3-tnfluoromethyl-phenyl)-propπonyl]-3-methyl-urea.
In further amides of the above compound, at least one of R1 and R2 is perfluoro- lower alkyl and the other is halo. Examples of such amides are: l-[3-cyclopentyl-2-(4-fluoro-3-tπfluoromethyl-phenyl)-propιonyl]-3-methyl urea; l-[3-cyclopentyl-2-(3-fluoro-4-tπfluoromethyl-phenyl)-propιonyl]-3-methyl urea.
In yet further amides of the above compound, at least one of R1 and R2 is lower alkyl sulfonyl, one of R1 and R2 is nitro and the other is lower alkyl sulfonyl. An example of such an amide is l-[3-cyclopentyl-2-(4-methanesulfonyl-3-nιtrophenyl)-propιonyl]-3- methyl-urea.
In the compounds of this invention descπbed above, R of the amide is hydrogen, lower alkyl, or lower alkenyl and RJ is cyclopentyl. In the compounds described below, R40 is the same but RJ is not cyclopentyl.
In certain such compounds, one of R1 and R2 is halo or hydrogen and the other is hydrogen. An example of such an amide is [2-(4-chloro-phenyl)-4-methyl-pentanoyl]-
1 o urea. In particular R and R may each be chloπne. Examples of such amides are: [3-cyclopropyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea; [3-cyclobutyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea; R-[2-(3,4-dιchloro-phenyl)-4-methyl-pentanoyl]-urea; l-[2-(3,4-dιchloro-phenyl)-4-methyl-pentanoyl]-3-methyl-urea; l-[2-(3,4-dichloro-phenyl)-hexanoyl]-3-methyl-urea.
In other such compounds, R40 is as descπbed above and R3 is cyclohexyl. In some such amides, one of R1 and R2 is halo or hydrogen and the other is halo. Examples of such amides are- 3-[cyclohexyl-2-(3,4-dichloro-phenyl)-propionyl]-urea;
[3-cyclohexyl-2-(3,4-dichloro-phenyl)-propionyl]-3-methyl-urea.
In other such compounds, R40 is as described above and R3 is cycloheptyl. In some such amides, one of R1 and R2 is halo or hydrogen and the other is halo. An example of such an amide is [3-cycloheptyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea. In certain compounds of this invention, R40 is -(CH2)n-C(O)OR5 or -C(O)-(CH2)n-C(O)OR6 In some such compounds, RJ of the amide is cyclopentyl Preferably R and R are independently halo. Examples of the above amides are: 3-{3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-propιonιc acid ethyl ester,
{ 3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-acetιc acid ethyl ester; { 3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-acetιc acid methyl ester, 3-{3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-propιonιc acid methyl ester, {3-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-acetιc acid ethyl ester; 3-{3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-3-oxo-propιonιc acid ethyl ester.
In certain compounds of this invention, R40 is hydroxy lower alkyl, or halo lower alkyl. In some such compounds, RJ of the amide is cyclopentyl Preferably R1 and R2 are independently halo, and in addition the amide is m the "R" configuration at the asymmetnc carbon shown. Examples of the above amides are: l-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propnonyl]-3-(2-hydroxy-ethyl)-urea; l-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propnonyl]-3-(2-hydroxy-propyl)-urea; l-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propnonyl]-3-(3-hydroxy-propyl)-urea; l-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propπonyl]-3-(2-hydroxy-propyl)-urea, l-(2-chloro-ethyl)-3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propnonyl]-urea; l-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propπonyl]-3-(3-hydroxy-propyl)-urea
In the compounds descπbed below, unless otherwise indicated, R4 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic πng connected by a πng carbon atom to the amme group shown, which five- or six-membered heteroaromatic πng contams from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting πng carbon atom, said mono-substituted heteroaromatic nng being monosubstituted at a position on a πng carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of lower alkyl, halo, nitro, cyano, -(CH2)n-OR6, -(CH2)n-C(O)OR7, -(CH2)n-C(O)NHR6, -C(O)-C(O)OR8, -(CH2)n-NHR6;.
In certain of such compounds, R3 is cyclopentyl (the compound I-D). The embodiments of the compound I-D are those compounds where R4 is an unsubstituted thiazole (Compound I-Dl). Among the vaπous embodiments of the compound of I-Dl are included those compounds where a) one of R1 and R2 is hydrogen, halogen, perfluoro-lower alkyl and the other of said
1
R and R~ is halo or perfluoro-lower alkyl,
1 1 b) one of R and R" is ammo, nitro, halo, nitro or hydrogen and the other of said R and R" is ammo, cyano or nitro, c) one of R1 and R" is lower alkylthio, perfluoro-lower alkyl thio, halo or hydrogen and the other of said R1 and R2 is perfluoro-lower alkylthio, lower alkylsulfmyl or lower alkylthio; d) one of R1 and R2 is lower alkyl sulfonyl, hydrogen, nitro, cyano, ammo, hydroxyammo, sulfonamido or halo, and the other of said R1 and R2 is lower alkyl sulfonyl, e) one of R1 and R2 is lower alkyl sulfonyl, and the other of said R1 and R" is halo or perfluoro-lower alkyl; f) one of R1 and R2 is perfluoro-lower alkyl sulfonyl or hydrogen and the other of
1 said R and R is perfluoro-lower alkyl sulfonyl; g) one of R1 and R2 is -OR5, or -C(O)OR5 and the other of said R1 and R2 is hydrogen or -OR5; and R3 is as above; and h) one of R1 and R2 is -OR5 and the other is halo. In accordance with another embodiment of this invention where R3 is cyclopentyl, the embodiments are those compounds where R4 is a mono-substituted thiazole (compounds I-D2). Among the embodiments of compounds I-D2, are those compounds where the mono-substitution is -(CH2)n-OR6 and n and R6 are as above (compounds I- D2(a)) Among the embodiments of compounds I-D2 (a) are those compounds where: a) one of R1 and R2 is halo and the other of said R1 and R2 is hydrogen or halo; b) one of R1 and R2 is lower alkyl sulfonyl, and the other of said R1 and R2 is lower alkyl sulfonyl or hydrogen, and c) one of R1 and R2 is hydrogen and the other of said R1 and R2 is lower alkyl or perfluoro-lower alkyl. In accordance with another embodiment of the invention where RJ is cyclopentyl and R4 is a mono-substituted thiazole (Compounds I-D2), are those compounds where the
1 9 mono-substitution is lower alkyl and one of R and R are hydrogen or halogen and the other of R! and R~ is halogen (Compounds I-D2(b)).
Among another embodiment of the compounds I-D are those compounds where the mono-substituted thiazole is substituted with -(CH2)n-C(O)OR7, wherein n is 0 or 1 and R7 is hydrogen, or lower alkyl (Compounds of I-D2(c)) Among the embodiments of compounds of formula I-D2(c) are those compounds where: a) one of R1 and R2 is hydrogen and the other of said R1 and R2 is halo, b) R1 and R2 are each independently halo, c) one of R1 or R2 is nitro, ammo or hydrogen and the other of said R1 and R" is nitro or amino, and d) one of R1 and R2 is lower alkyl sulfonyl, perfluoro-lower alkyl, halogen or hydrogen and the other of said R1 andR" is lower alkyl sulfonyl.
In accordance with another embodiment of this invention, where RJ and cyclopentyl and R4 is a mono-substituted thiazole (Compounds I-D2) are those compounds where the mono-substituted thiazole is substituted with -C(O)-C(O)OR , wherein R8 is as above (Compounds I-D2(d)). Among the embodiments of compound I- D2(d) are those compounds where:
1 1 a) one of R and R are hydrogen and the other of said R and R is nitro or am o; b) one of R1 and R2 is halo or perfluoro-lower alkyl and the other of said R1 and R2 is perfluoro-lower alkyl, halogen or hydrogen; and c) one of R1 and R2 is hydrogen or halogen and the other of said R1 and R2 is lower alkylsulfonyl. In accordance with another embodiment of this invention, where R3 is cyclopentyl and R4 is a mono-substituted thiazole, compounds I-D2, are those compounds where the mono-substitution on the thiazole πng is a nitro group and one of R1 and R2 are hydrogen aanndd hhaallooggeenn aanndd the other of R1 and R2 is halogen or lower alkyl sulfonyl (compound of formula I-D2(e))
In accordance with another embodiment of this invention, where R3 is cyclopentyl (Compound I-D) and R4 is an unsubstituted pyndme (Compounds I-D3). Among the embodiments of compound I-D3 are those compounds where. a) one of R and R~ are halo, perfluoro-lower alkyl or hydrogen and the other of said R1 and R2 is halo, perfluoro-lower alkyl, amino, cyano or nitro; b) one of R1 and R2 is lower alkyl thio, perfluoro-lower alkyl thio or cyano, and the other is hydrogen;
1 9 c) one of R and R is lower alkyl sulfonyl, halo, cyano, nitro or hydrogen and the other of said R1 and R2 is lower alkyl sulfonyl; and d) one of R1 and R2 is perfluoro-lower alkyl sulfonyl, lower alkyl sulfonyl or hydrogen and the other of said R1 and R2 is perfluoro-lower alkyl sulfonyl or perfluoro-lower alkyl
In accordance with another embodiment of the invention, where R is cyclopentyl (Compounds I-D) are those compounds where R is a mono-substituted pyπdine πng Among the embodiments of the mono-substituted pyndme (Compounds I-D4) are those compounds where the mono-substitution is -(CH2)n-C(O)OR7, wherein n and R7 are as above (compound I-D4(a)) Among the embodiments of compounds I-D4(a) are those compounds where.
1 9 a) wherein R and R are each independently halo; b) wherein one of R1 and R2 is hydrogen and the other of said R1 and R2 is halo, ammo, cyano or nitro; and c) one of R1 and R2 is perfluoro-lower alkyl sulfonyl, lower alkyl sulfonyl or hydrogen and the other of said R1 and R2 is perfluoro-lower alkyl sulfonyl or lower alkyl sulfonyl. Other embodiments of the compounds of formula I-D4(b) are those compounds where the pyridine πng is mono-substituted with -(CH2)α-ORD wherein n and R are as above (Compounds I-D4(b)). Among the embodiments of the compound I-D4(b) are those compounds where: a) one of R1 and R2 are halo and the other of said R1 and R2 is hydrogen or halo; and
1 9 1 b) one of R and R is lower alkyl sulfonyl or hydrogen and the other of said R and R2 is lower alkyl sulfonyl.
Another embodiment of compounds where RJ is cyclopentyl and R is a mono- substituted pyndme nng are those compounds where the pyridine nng is mono- substituted with a halo or perfluoro-lower alkyl substituent, the compound of formula I- D4(c) Among the embodiments of the compound of formula I-D4(c) are those compounds where: a) one of R1 and R2 is halo or hydrogen and the other is halo; and b) one of R1 and R2 is halo, nitro or hydrogen and the other is perfluoro-lower alkyl sulfonyl or lower alkyl sulfonyl.
In accordance with another embodiment of this invention are compounds of where RJ is cyclopentyl and R4 is a mono-substituted pyndme are those compounds where the pyndme is mono-substituted with a nitro substituent, (Compound I-D4(d)). The
1 9 embodiments of the compound I-D4(d) include compounds where one of R and R" is halo and other of said R1 or R~ is hydrogen, halo, or lower alkyl sulfonyl.
In accordance with another embodiment of this invention are compounds of formula I where R3 is cyclopentyl and R4 is mono-substituted pyridine and the mono- substitution is a lower alkyl group (Compounds I-D4(e)). Among the embodiments of compounds I-D4(e) are those compounds where one of R1 and R2 is halo or hydrogen and the other of R1 and R2 is halo, perfluoro-lower alkyl, perfluoro-lower alkyl sulfonyl, or lower alkyl sulfonyl.
In accordance with another embodiment of this invention where R3 is cyclopentyl and R is a mono-substituted pyridine are those compounds where the mono-substituent is -(CH2)n-C(O)-NHR6, wherein n and R are as above (Compound I-D4(f)). Among the embodiments of compound I-D4(f) are those compounds wherein one of R1 and R are independently selected from the group consisting of halo or hydrogen and the other of said R1 and R2 is halo, or lower alkyl sulfonyl
Another embodiment of this invention where RJ is cyclopentyl are those compounds where R4 is an unsubstituted imidazolyl (Compound I-D5) Among the embodiments of compounds I-D5 are those compounds wherein one of R1 and R2 is
1 9 selected from the group consisting of halo and hydrogen and the other of said R and R is halo, or lower alkyl sulfonyl
Another embodiment of the compounds of this invention are those compounds where RJ is cyclopentyl and R4 is an isoxazolyl nng (the compound I-D6) The embodiments of compound I-D6 are those compounds where the isoxazolyl πng is unsubstituted or substituted, preferably mono-substituted Among the mono-substituted substituents, the prefeπed substituents substituted on the isoxazolyl πng is lower alkyl An embodiment of the compound I-D6, either where the isoxazolyl πng is unsubstituted
1 9 or substituted with a lower alkyl substituent are those compounds where one of R and R
1 9 is halo, nitro, lower alkyl sulfonyl or perfluoro-lower alkyl and the other of R and R is hydrogen or halo
Another embodiment of this invention where RJ is cyclopentyl are those compounds where R4 is either an unsubstituted oxazolyl, or an oxazolyl mono-substituted with a lower alkyl group Another embodiment with respect to either of those compounds are those compounds where one of R or R" is halo, nitro, lower alkyl sulfonyl or
1 9 perfluoro-lower alkyl and the other is of R or R is hydrogen or halo
Another embodiment of this invention where RJ is cyclopentyl are those compounds where R4 is pyndazmyl which is either unsubstituted or substituted with a lower alkyl group (Compound I-D7) Embodiments of the compound I-D7 are encompassed by this invention include those compounds where one of R1 or R2 is halo, nitro, lower alkyl sulfonyl or perfluoro-lower alkyl and the other of said R1 or R2 is hydrogen or halo Another embodiment of this invention where R3 is cyclopentyl include compounds where R4 is unsubstituted pynmidmyl The embodiments of those compounds where RJ is cyclopentyl and R4 is unsubstituted pyπmidinyl include those
1 9 compounds where one of R or R" is halo, nitro, lower alkyl sulfonyl or perfluoro-lower alkyl and the other is hydrogen or halo
Another embodiment of this invention includes compounds where RJ is cyclopentyl where R4 is an unsubstituted thiadiazolyl πng Among the embodiments included with those compounds where RJ is cyclopentyl and R4 is an unsubstituted thiadiazolyl πng are those compounds wherein one of R1 or R" is halo, nitro, lower alkyl sulfonyl or perfluoro-lower alkyl and the other of said R1 and R2 is hydrogen or halo
In accordance with other embodiments of this invention, R3 in the compound of formula I can be cycloheptyl or cyclohexyl The embodiments of the compound of formula I where R^ is cycloheptyl or cyclohexyl include those compounds where R4 is thiazolyl which can be mono-substituted or unsubstituted Embodiments included withm such compounds where R3 is cycloheptyl or cyclohexyl and R4 is an unsubstituted thiazolyl include those compounds wherein one of R1 and R2 is halo, lower alkyl sulfinyl, perfluoro-lower alkyl sulfinyl, perfluoro-lower alkyl or lower alkyl sulfonyl and the other is of said R1 and R" with halo, perfluoro-lower alkyl or hydrogen
Examples of compounds of formula I according to the present invention, wherein
R4 is a heteroaromatic πng are
2-(3-chloro-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, 2-(4-bromo-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonarmde, 2-(4-chloro-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-N-thιazol-2-yl-2-(4-tπfluoromethyl-phenyl)-propιonamιde, 3-cyclopentyl-2-(3-fluoro-4-tπfluoromethyl-phenyl)-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-2-(4-fluoro-3-tπfluoromethyl-phenyl)-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-N-thιazol-2-yl-2-(3-tnfluoromethyl-phenyl)-propιonamιde, -cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-N-thιazol-2-yl-propιonarmde, -cyclopentyl-2-(4-nιtrophenyl)-N-thιazol-2-yl-propιonamιde, -(4-amιno-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, -(3-ammo-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, -(4-chloro-3-nιtro-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, -(4-cyano-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, -cyclopentyl-N-thιazol-2-yl-2-(4-tπfluoromethylsulfanyl-phenyl)-propιonamιde, -cyclopentyl-2-(4-methylsulfanyl-phenyl)-N-thιazol-2-yl-propιonamιde, -cyclopentyl-2-(4-methylsulfanyl-3-tnfluoromethyl-phenyl)-N-thιazol-2-yl- propionamide, -cyclopentyl-2-(4-methanesulfmyl-phenyl)-N-thιazol-2-yl-propιonamιde, -cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-thιazol-2-yl-propιonamιde, -cyclopentyl-2-(4-methanesulfonyl-3-nιtrophenyl)-N-thιazol-2-yl-propιonamιde, -(3-ammo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, -cyclopentyl-2-(3-hydroxyamιno-4-methanesulfonyl-phenyl)-N-thιazol-2-yl- propionamide, -(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, -cyclopentyl-2-(4-ethanesulfonyl-phenyl)-N-thιazol-2-yl-propιonamιde, -(3,4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, -cyclopentyl-2-(4-sulfamoyl-phenyl)-N-thιazol-2-yl-propιonamιde, -[4-(butane-l-sulfonyl)-phenyl]-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, -cyclopentyl-2-[4-(propane-l-sulfonyl)-phenyl]-N-thιazol-2-yl-propιonarmde, -cyclopentyl-2-(4-methanesulfonyl-3-tnfluoromethyl-phenyl)-N-thιazol-2-yl- propionamide, (R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, -[3-chloro-4-methanesulfonyl-phenyl]-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, -(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, -cyclopentyl-N-thιazol-2-yl-2-(4-tnfluoromethanesulfonyl-phenyl)-propιonamιde, -cyclopentyl-N-thιazol-2-yl-2-(3-tπfluoromethanesulfonyl-phenyl)-propιonamιde, -cyclopentyl-N-thιazol-2-yl-2-(4-tπfluoromethoxy-phenyl)-propιonamιde, -cyclopentyl-2-(3-methoxy-phenyl)-N-thιazol-2-yl-propιonamιde, -cyclopentyl-2-(3-hydroxy-phenyl)-N-thιazol-2-yl-propιonamιde, -cyclopentyl-2-(3,4-dιmethoxy-ρhenyl)-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-2-(3,4-dιhydroxy-phenyl)-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(4-methoxy-phenyl)-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(4-hydroxy-phenyl)-N-thιazol-2-yl-propιonamιde, - [2-cyclopentyl-l-(thιazol-2-ylcarbamoyl)-ethyl] -benzoic acid methyl ester, 3-cyclopentyl-2-(3-fluoro-4-methoxy-phenyl)-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(3-fluoro-4-hydroxy-phenyl)-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(5-hydroxymethyl-thιazol-2-yl)-propιonamιde,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-[4-(2-hydroxyethyl)-thιazol-2-yl]-propιonamιde,
2-(4-chloro-phenyl)-3-cyclopentyl-N-(5-hydroxymethyl-thιazol-2-yl)-propιonamιde, 3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(4-hydroxymethyl-thιazol-2-yl)-propιonamιde,
3-cyclopentyl-N-(4-hydroxymethyl-thιazol-2-yl)-2-(4-methanesulfonyl-phenyl)- propionamide,
3-cyclopentyl-N-[4-(2-hydroxyethyl)-thιazol-2-yl]-2-(4-methanesulfonyl-phenyl)- propionamide, 3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(4-methyl-thιazol-2-yl)-propιonamιde,
3-cyclopentyl-2-(3.4-dιchlorophenyl)-N-(5-methyl-thιazol-2-yl)-propιonamιde,
{ 2-[2-(3-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-thιazol-4-yl }-acetιc acid ethyl ester,
{ 2-[2-(3-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-thιazol-4-yl }-acetιc acid methyl ester,
2-[2-(3-chloro-phenyl)-3-cyclopentyl-propιonylammo]-thιazole-4-carboxylιc acid methyl ester,
2-[2-(3-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-thιazole-4-carboxylιc acid ethyl ester, { 2-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-thιazol-4-yl }-acetιc acid ethyl ester,
2-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylammo]-thιazole-4-carboxyhc acid methyl ester,
2-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-thιazole-4-carboxylιc acid ethyl ester,
{ 2-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylammo]-thιazol-4-yl }-acetιc acid methyl ester,
{2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylamιno]-thιazol-4-yl}-acetιc acid,
{ 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thιazol-4-yl }-acetιc acid ethyl ester, 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thιazole-5-carboxylιc acid,
2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thιazole-4-carboxylιc acid,
{ 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylamιno]-thιazol-4-yl }-acetιc acid methyl ester, (2R)-2-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonylamιno]-thιazole-4-carboxylιc acid methyl ester,
2-[3-cyclopentyl-2-(3.4-dιchlorophenyl)-propιonylamιno]-thιazole-5-carboxyhc acid methyl ester,
2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thιazole-5-carboxylιc acid ethyl ester,
{2-[3-cyclopentyl-2-(4-nιtro-phenyl)-propιonylammo]-thιazol-4-yl}-acetιc acid ethyl ester
{ 2-[3-cyclopentyl-2-(4-mtro-phenyl)-propιonylammo]-thιazol-4-yl }-acetιc acid methyl ester, 2-[3-cyclopentyl-2-(4-nιtro-phenyl)-propιonylammo]-thιazole-4-carboxylιc acid methyl ester,
2-[3-cyclopentyl-2-(4-nιtro-phenyl)-propιonylamιno]-thιazole-4-carboxyhc acid ethyl ester,
{2-[2-(4-ammo-phenyl)-3-cyclopentyl-propιonylarmno]-thιazol-4-yl}-acetιc acid methyl ester,
2-[2-(4-amιno-phenyl)-3-cyclopentyl-propιonylammo]-thιazole-4-carboxylιc acid methyl ester,
{2-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propιonylamιno]-thιazole-4-carboxylιc acid ethyl ester, { 2-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propιonylammo]-thιazol-4-yl }-4-acetιc acid methyl ester,
{2-[3-cyclopentyl-2-(4-methanesulfonyl-3-tπfluoromethyl-phenyl)-propιonylammo]- thιazol-4-yl} -acetic acid methyl ester,
2-[3-cyclopentyl-2-(4-methanesulfonyl-3-tπfluoromethyl-phenyl)-propιonylamιno]- thιazole-4-carboxylιc acid methyl ester,
{ 2-[3-cyclopentyl-2-(4-nιtro-phenyl)-propιonylammo]-thιazol-4-yl }-oxo-acetιc acid ethyl ester,
{2-[3-cyclopentyl-2-(3,4-dichlorophenyl)-propionylammo]thiazol-5-yl}-oxo-acetic ethyl ester, {2-[3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)-propιonylamιno]-thιazol-4-yl}- oxo-acetic acid ethyl ester, { 2-[2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonylammo]-thιazol-4-yl}- oxo-acetic acid ethyl ester,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(5-nιtro-thιazol-2-yl)-propιonamιde, -cyclopentyl-2-(3-fluoro-4-tπfluoromethyl-phenyl)-N-pyπdm-2-yl-propιonarmde, 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-N-pyπdm-2-yl-propιonamιde,
3-cyclopentyl-N-pyπdm-2-yl-2-(4-tπfluoromethyl-phenyl)-2-propιonamιde,
3-cyclopentyl-N-thιazol-2-yl-2-(3-tπfluoromethyl-phenyl)-propιonamιde, -(3-chloro-phenyl)-3-cyclopentyl-N-pyπdιn-2-yl-propιonamιde, -(4-amιno-phenyl)-3-cyclopentyl-N-pyπdιn-2-yl-propιonamιde, 2-(4- cyano-phenyl)-3-cyclopentyl-N-pyndm-2-yl-propιonamιde, 2-(4-chloro-phenyl)-3-cyclopentyl-N-pyπdm-2-yl-propιonarmde, 2-(4-chloro-3-nιtro-phenyl)-3-cyclopentyl-N-pyndιn-2-yl-propιonamιde, 3-cyclopentyl-2-(4-nιtro-phenyl)-N-pyndιn-2-yl-propιonamιde, 2-(4-cyano-phenyl)-3-cyclopentyl-N-pyndιn-2-yl-propιonamιde, 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-N-pyπdιn-2-yl-propιonamιde,
3-cyclopentyl-N-pyndm-2-yl-2-(4-tπfluoromethylsulfanyl-phenyl)-propιonamιde, 3-cyclopentyl-2-(4-methanesulfonyl-3-nιtrophenyl)-N-pyndm-2-yl-propιonamιde, 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-pyπdm-2-yl-propιonamιde, 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyπdm-2-yl-propιonamιde, 2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyπdm-2-yl- propιonamιde,
3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-N-pyndιn-2-yl-propιonamιde,
2-(3,4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyπdm-2-yl-propιonamιde,
2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyπdm-2-yl-propιonarmde,
3-cyclopentyl-2-(4-methanesulfonyl-3-tnfluoromethyl-phenyl)-N-pyπdιn-2-yl- propionamide,
3-cyclopentyl-N-pyπdιn-2-yl-2-(4-tnfluoromethanesulfonyl-phenyl)-propιonarmde,
3-cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(5-carboxymethylpyndιn)-2-yl-propιonamιde,
6-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonylammo]-nιcotιmc acid methyl ester,
6-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-nιcotmιc acid, 6-[2-(3-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-nιcotιmc acid methyl ester,
6-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-mcotmιc acid methyl ester,
6-[3-cyclopentyl-2-(4-nιtro-phenyl)-propιonylammo]-nιcotιnιc acid methyl ester,
6-[2-(4-amιno-phenyl)-3-cyclopentyl-propιonylamιno]-nιcotmιc acid methyl ester, 6-[2-(3-chloro-phenyl)-3-cyclopentyl-propionylamino]-nicotinic acid, 6-[2-(4-cyano-phenyl)-3-cyclopentyl-propionylamino]-nicotinic acid,
6-[3-cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)-propionylamino]-nicotinic acid methyl ester, 6-[3-cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)-propionylamino]-nicotinic acid,
6-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propionylamino]-nicotinic acid methyl ester,
3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-N-(5-hydroxymethyl-pyridin-2-yl)- propionamide, 3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(5-hydroxy-pyridin-2-yl)-propionamide,
2-(4-chloro-phenyl)-3-cyclopentyl-N-(5-hydroxymethyl-pyridin-2-yl)-propionamide,
3-cyclopentyl-N-(5-hydroxymethyl-pyridin-2-yl)-2-(4-methanesulfonyl-phenyl)- propionamide,
N-(5-chloro-pyridin-2-yl)-3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide, 3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(5-brompyridin)-2-yl-propionamide,
3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-N-(5-trifluoromethyl-pyridin-2-yl)- propi on amide,
N-(5-bromo-pyridin-2-yl)-3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionamide,
N-(5-chloro-pyridin-2-yl)-3-cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)- propionamide,
N-(5-bromo-pyridin-2-yl)-3-cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)- propionamide,
N-(5-bromo-pyridin-2-yl)-3-cyclopentyl-2-(4-methanesulfonyl-3-nitro-phenyl)- propionamide, 2-(3-bromo-4-methanesulfonyl-phenyl)-N-(5-bromo-pyridin-2-yl)-3-cyclopentyl- propionamide,
N-(5- bromo-pyridin-2-yl)-2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionamide,
2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-(5-trifluoromethyl-pyridin-2-yl)- propionamide,
N-(5-chloro-pyridin-2-yl)-2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionamide,
3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(5-nitropyridin)-2-yl-propionamide,
3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(5-methylpyridin)-2-yl-propionamide, 3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(4-methylpyridin)-2-yl-propionamide,
3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(6-methylpyridin)-2-yl-propionamide, 3-cyclopentyl-N-(5-methyl-pyridin-2-yl)-2-(4-trifluoromethanesulfonyl-phenyl)- propionamide,
3-cyclopentyl-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-(5-methyl-pyridin-2-yl)- propionamide, 6-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionylamino]-N-methyl-nicotinamide,
3-cyclopentyl-2-(3,4-dichlorophenyl)-N-(lH-imidazol-2-yl)-propionamide,
3-cyclopentyl-2-(3,4-dichlorophenyl)-N-(5-methyl-isoxazol-3-yl)-propionamide,
3-cyclopentyl-2-(3,4-dichlorophenyl)-N-oxazol-2-yl-propionamide,
3-cyclopentyl-2-(3,4-dichlorophenyl)-N-pyridazin-3-yl-propionamide, 3-cyclopentyl-2-(3,4-dichlorophenyl)-N-pyrimidin-2-yl-propionamide, 3-cyclopentyl-2-(3,4-dichlorophenyl)-N-pyrimidin-6-yl-propionamide, 3-cyclopentyl-2-(4-nitro-phenyl)-N-pyrimidin-4-yl-propionamide, 3-cyclopentyl-2-(3,4-dichlorophenyl)-N-[l,3,4]thiadiazol-2-yl-propionamide, 2-[4-methanesulfonyl phenyl] -3 -cyclohexyl N-thiazol-2-yl-ρropionamide, and 2-[4-methanesulfonyl phenyl]-3-cycloheptyl N-thiazol-2-yl-propionamide.
Examples of compounds of formula I according to the present invention, wherein R4 is a residue -C(O)NHR40 and R40 is as defined above, are: l-(3-cyclopentyl-2-phenyl-propionyl)-3-methyl-urea, l-[2-(3-chloro-phenyl)-3 cyclopentyl-propionyl]-3-methyl-urea, l-[2-(4-chloro-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea, l-[2-(4-cyano-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea, l-[2-(4-bromo-phenyl)-3-cyclopentyl-propionyl]-3-methyl urea,
[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-urea, l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-methyl-urea, l-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-3-ethyl-urea, l-allyl-3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-proprionyl]-urea, l-allyl-3-[3-cyclopentyl-2(R)-(3, 4-dichloro-phenyl)-proprionyl]-urea, l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-ethyl-urea, l-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-3-methyl-urea, l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-isopropyl-urea, l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-propyl-urea, 3-cyclopentyl-2-(3,4-difluoro-phenyl)-propionyl]-3-methyl-urea,
2-(4-chloro-3-nitro-phenyl)-3-cyclopentyl-proprionyl]-3-methyl-urea,
3-cyclopentyl-2-(4-nitro-phenyl)-propionyl]-3-methyl-urea,
3-cyclopentyl-2-(4-trifluoromethylsulfanyl-phenyl)-propionyl]-3-methyl urea,
3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-propionyl]-3-methyl urea,
3-cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)-propionyl]-3-methyl urea,
3-cyclopentyl-2-(3-trifluoromethanesulfonyl-phenyl)-propionyl]-3-methyl urea,
3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propionyl]-3-methyl urea,
2-[4-(butane-l-sulfonyl)-phenyl]-3-cyclopentyl-proprionyl}-3-methyl-urea,
3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-proprionyl]-3-methyl-urea,
2-(3,4-bis-methanesulfonyl-phenyl)-3-cyclopentyl-proprionyl]-3-methyl-urea,
2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-proprionyl]-3-methyl-urea,
3-cyclopentyl-2-(3-fluoro-4-methanesulfonyl-phenyl)-proprionyl]-3-methyl-urea,
2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-proprionyl]-3-methyl-urea,
2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-proprionyl]-3-methyl-urea,
2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-proprionyl]-3-ethyl-urea,
2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-proprionyl]-3-methyl-urea,
3-cyclopentyl-2-(4-methanesulfonyl-3-trifluoromethyl-phenyl)-proprionyl]-3-methyl- urea.
3-cyclopentyl-2-(4-fluoro-3-trifluoromethyl-phenyl)-propionyl]-3-methyl urea, 3-cyclopentyl-2-(3-fluoro-4-trifluoromethyl-phenyl)-propionyl]-3-methyl urea, 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-propionyl]-3-methyl-urea,
2-(4-chloro-phenyl)-4-methyl-pentanoyl]-urea,
3-cyclopropyl-2-(3,4-dichloro-phenyl)-propionyl]-urea,
3-cyclobutyl-2-(3,4-dichloro-phenyl)-propionyl]-urea, R-[2-(3,4-dichloro-phenyl)-4-methyl-pentanoyl]-urea,
-[2-(3,4-dichloro-phenyl)-4-methyl-pentanoyl]-3-methyl-urea,
-[2-(3,4-dichloro-phenyl)-hexanoyl]-3-methyl-urea, 3-[cyclohexyl-2-(3,4-dichloro-phenyl)-propionyl]-urea,
3-cyclohexyl-2-(3,4-dichloro-phenyl)-propionyl]-3-methyl-urea,
3-cycloheptyl-2-(3,4-dichloro-phenyl)-propionyl]-urea,
3-{3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-propionic acid ethyl ester, {3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-acetic acid ethyl ester,
{3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-acetic acid methyl ester,
3-{ 3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-propionic acid methyl ester, { 3-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-ureido}-acetic acid ethyl ester,
3-{3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-3-oxo-propionic acid ethyl ester, l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-proprionyl]-3-(2-hydroxy-ethyl)-urea, l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-proprionyl]-3-(2-hydroxy-propyl)-urea, l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-proprionyl]-3-(3-hydroxy-propyl)-urea, l-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-proprionyl]-3-(2-hydroxy-propyl)-urea, l-(2-chloro-ethyl)-3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-proprionyl]-urea, and l-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-proprionyl]-3-(3-hydroxy-propyl)-urea.
It will be appreciated that the compounds of formula I may be derivatised at functional groups to provide derivatives which are capable of conversion back to the parent compounds in vivo. Additionally, any physiologically acceptable equivalents of the compounds of formula I, which are capable of producing the parent compounds of formula I in vivo, are within the scope of this invention.
The compound of formula I can be prepared starting from the compound of formula N by the following Reaction Scheme:
Reaction Scheme
Figure imgf000030_0001
Figure imgf000030_0002
wherein R1, R2 and R3 are as above, R42 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six-membered heteroaromatic ring contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting πng carbon atom; said mono-substituted heteroaromatic πng being monosubstituted at a position on a πng carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of lower alkyl, halo, nitro, cyano, -(CH2)n-OR6, -(CH2)n-C(O)OR7, -(CH2)n-C(O)NHR6, -C(O)-C(O)OR8 or -(CH2)„-NHR6, wherein R6, R7, R8 and n are as defined above; R15 is hydrogen or lower alkyl; and R41 is lower alkyl, lower alkenyl, hydroxy lower alkyl, halo lower alkyl or -(CH2)n-C(O)OR5, wherein R5 is hydrogen or lower alkyl and n is as defined above
The carboxylic acids and their lower alkyl esters of formula V wherein one of R1 and R" is nitro, cyano, thio, ammo, chloro, bromo, or lodo and the other is hydrogen are commercially available In cases, where only the carboxylic acids are available, they can be converted to the coπesponding esters of lower alkyl alcohols using any conventional esteπfication methods. All the reactions hereto forward are to be earned out on lower alkyl esters of the carboxylic acids of formula V. The amino substituted compounds of formula V can be converted to other substituents either before or after conversion to the compounds of formulae I-a, I-b, I-c or I-d. In this respect, the amino groups can be diazotized to yield the corresponding diazomum compound, which in situ can be reacted with the desired lower alkyl thiol, perfluoro-lower alkyl thiol (see for example, Baleja, J.D. Synth. Comm. 1984, 14, 215; Giam, C. S.; Kikukawa, K., J. Chem. Soc, Chem. Comm 1980, 756; Kau, D.; Krushmski, J. H.; Robertson, D. W, J. Labelled Compd Rad. 1985, 22, 1045; Oade, S.; Shinhama, K.; Kim, Y. H., Bull Chem Soc. Jpn. 1980, 53, 2023; Baker, B. R.; et al, J. Org. Chem. 1952, 17, 164), or alkaline earth metal cyanide, to yield coπespondmg compounds of formula V, where one of the substituents is lower alkyl thio, perfluoro-lower alkyl thio, or cyano, and the other is hydrogen. If desired, the lower alkyl thio or perfluoro-lower alkyl thio compounds can then be converted to the coπesponding lower alkyl sulfonyl or perfluoro-lower alkyl sulfonyl substituted compounds of formula N by oxidation. Any conventional method of oxidizing alkyl thio substituents to sulfones can be utilized to effect this conversion. ι
If it is desired to produce compounds of formula N wherein one of R and R is a lower alkyl or perfluoro-lower alkyl group, the corresponding halo substituted compounds of formula V can be used as starting matenals. Any conventional method of converting an aromatic halo group to the coπesponding alkyl group (see for example, Katayama, T., Umeno, M., Chem. Lett. 1991, 2073; Reddy, G. S.; Tarn., Organometallics, 1984, 3, 630; Novak, J., Salemmk, C. A., Synthesis, 1983, 7, 597; Eapen, K. C; Dua, S. S.; Tamboroski, C , J. Org Chem. 1984, 49, 478; Chen, Q, -Y.; Duan, J -X. J. Chem. Soc. Chem. Comm 1993, 1389; Clark, J. H.; McClmton, M. A.; Jone, C W.; Landon, P., Bisohp, D , Blade, R. J., Tetrahedron Lett. 1989, 2133; Powell, R. L.; Heaton, C. A, US patent 5113013) can be utilized to effect this conversion. On the other hand, the thio substituent can be oxidized to a -SO3H group which then can be converted to -SO Cl which is reacted with ammonia to form the sulfonamide substituent -S(O)2-NH2- If i is desired to produce compounds of formula V wherein one or both of R1 and R2 is hydroxyammo, the coπesponding nitro compounds can be used as starting material and can be converted to the corresponding compounds where R1 and/or R2 are hydroxyammo. Any conventional method of converting a nitro group to the coπespondmg aromatic hydroxyammo compound can be used to affect this conversion
The carboxylic acids or lower alkyl esters of formula N wherein both of R1 and R2 are chloro or fluoro are commercially available. In cases, where only the carboxylic acids are available, they can converted to the coπesponding esters of lower alkyl alcohols using any conventional esteπfication method. To produce the compound of formula N where both R1 and R2 are nitro, 3,4-dmιtrotoluene can be used as starting mateπal. This compound can be converted to the corresponding 3,4-dmιtrophenyl acetic acid. This conversion can take place either before or after the compound of formula V is converted to the compounds of formulae I-a, I-b, I-c or I-d. Any conventional method of converting an aryl methyl group to the coπesponding aryl acetic acid can be utilized to effect this conversion (see for example, Clark, R. D.; Muchowski, J. M.; Fisher, L. E.; Flippin, L. A.; Repke, D. B.; Souchet, M, Synthesis, 1991, 871). The compounds of formula N where both R1 and R2 substituents are ammo can be obtained from the corresponding dmitro compound of formula N, descnbed above. Any conventional method of reducing a nitro group to an amme can be utilized to effect this conversion. The compound of formula N where both R1 and R2 are amme groups can be used to prepare the coπespondmg compound of formula N where both R1 and R2 are iodine or bromine via a diazotization reaction. Any conventional method of converting am o group to an lodo or bromo group (see for example, Lucas, H. J.; Kennedy, E. R. Org. Synth. Coll. Vol, II 1943, 351) can be utilized to effect this conversion. If it is desired to produce compounds of formula V, where both R1 and R2 are lower alkyl thio or perfluoro-lower alkyl thio groups, the compound of formula N where R1 and R2 are ammo can be used as starting matenal. Any conventional method of converting aryl am o group to aryl thioalkyl group can be utilized to effect this conversion. If it is desired to produce compounds of formula N where R1 and R" are lower alkyl sulfonyl or lower perfluoro alkyl sulfonyl, the coπespondmg compounds of formula N where R and R are lower alkyl thio or perfluoro-lower alkyl thio can be used as starting matenal. Any conventional method of oxidizing alkyl thio substituents to sulfones can be utilized to effect this conversion.
If it is desired to produce compounds of formula V, where both R1 and R2 are substituted with lower alkyl or perfluoro-lower alkyl groups, the coπesponding halo substituted compounds of formula N can be used as starting mateπals. Any conventional method of converting an aromatic halo group to the coπespondmg alkyl or perfluoro- lower alkyl group can be utilized to effect this conversion.
If it is desired to produce compounds of formula N, where one or both of R1 and
R" are substituted with sulfonamido, the coπesponding compounds where one or both of R1 and R2 are substituted with nitro can be used as starting mateπals. Any standard method of converting a nitrophenyl compound to the corresponding sulfonamidophenyl compound can be used to effect this conversion.
The carboxylic acids corresponding to the compounds of formula N where one of R1 and R2 is nitro and the other is halo are known from the literature (see for 4-chloro-3- nitrophenyl acetic acid, Tadayuki, S.; Hiroki, M.; Shinji, U.; Mitsuhiro, S. Japanese patent, JP 71-99504, Chemical Abstracts 80:59716; see for 4-nιtro-3-chlorophenyl acetic acid, Zhu, J.; Beugelmans, R.; Bourdet, S.; Chastanet, J.; Rousssi, G. J. Org. Chem. 1995, 60, 6389; Beugelmans, R.; Bourdet, S.; Zhu, J. Tetrahedron Lett. 1995, 36, 1279). These carboxylic acids can be converted to the coπesponding lower alkyl esters using any conventional esteπfication methods. Thus, if it is desired to produce the compound of formula N where one of R1 and R2 is nitro and the other is lower alkyl thio or perfluoro-
1 9 lower alkyl thio, the corresponding compound where one of R and R is nitro and the other is chloro can be used as starting matenal. In this reaction, any conventional method of nucleophilic displacement of aromatic chlonne group with a lower alkyl thiol can be used (see for example, Smgh, P.; Batra, M. S.; Smgh, H, J. Chem. Res.-S 1985 (6), S204; Ono, M.; Νakamura, Y.; Sata, S.; Itoh, I, Chem. Lett, 1988, 1393; Wohrle, D.; Eskes, M.; Shigehara, K., Yamada, A, Synthesis, 1993, 194; Sutter, M., Kunz, W, US patent, US 5169951) Once the compounds of formula N where one of R1 and R2 is nitro and the other is lower alkyl thio or perfluoro-lower alkyl thio are available, they can be converted to the coπesponding compounds of formula N where one of R1 and R2 is nitro and the other is lower alkyl sulfonyl or perfluoro-lower alkyl sulfonyl using conventional oxidation procedures.
If it is desired to produce compounds of formula V where one of R and R is amino and the other is lower alkyl thio or perfluoro-lower alkyl thio, the coπesponding compound where one of R1 and R2 is nitro and the other is lower alkyl thio or perfluoro- lower alkyl thio can be used as starting matenals. Any conventional method of reducing an aromatic nitro group to an am e can be utilized to effect this conversion.
1 9
If it is desired to produce compounds of formula N where one of R and R is lower alkyl thio and the other is perfluoro-lower alkyl thio, the corresponding compound where one of R1 and R2 is amino and the other is lower alkyl thio or perfluoro-lower alkyl thio can be used as starting mateπals. Any conventional method of diazotiz g aromatic amino group and reacting it in situ with the desired lower alkyl thiol can be utilized to effect this conversion.
1 -j If it is desired to produce compounds of formula N where one of R and R is lower alkyl sulfonyl and the other is perfluoro-lower alkyl sulfonyl, the corresponding compounds where one of R1 and R2 is lower alkyl thio and the other is perfluoro-lower alkyl thio, can be used as starting matenals. Any conventional method of oxidizing an aromatic thio ether group to the coπesponding sulfone group can be utilized to effect this conversion
If it is desired to produce compounds of formula N where one of R1 and R2 is halo and the other is lower alkyl thio or perfluoro-lower alkyl thio, the corresponding compounds where one of R1 and R2 is ammo and the other is lower alkyl thio or perfluoro-lower alkyl thio can be used as starting mateπals. Any conventional method of diazotizmg an aromatic amino group and conversion of it in situ to an aromatic halide can be utilized to effect this conversion
If it is desired to produce compounds of formula N where one of R1 and R2 is halo and the other is lower alkyl sulfonyl or perfluoro-lower alkyl sulfonyl, the corresponding compounds where one of R1 and R2 is halo and the other is lower alkyl thio or perfluoro- lower alkyl thio can be used as starting matenals Any conventional method of oxidizing an aromatic thio ether to the corresponding sulfone can be utilized to effect this conversion If it is desired to produce compounds of vaπous combinations of lower alkyl and perfluoro-lower alkyl groups of compounds of formula N, the coπespondmg halo substituted compounds of formula N can be used as starting mateπals. Any conventional method of converting an aromatic halo group to the coπesponding alkyl group can be utilized to effect this conversion.
If one wishes to prepare the compound formula V where one of R1 and R2 is nitro and the other is ammo, the compound of formula V where one of R1 and R2 is nitro and other is chloro can be used as a starting matenal. The chloro substituent on the phenyl nng can be converted to an lodo substituent (see for example, Bunnett, J. F.; Conner, R M.; Org. Synth. Coll Vol V, 1973, 478; Clark, J. H.; Jones, C. W. J. Chem. Soc. Chem. Commun. 1987, 1409), which in turn can be reacted with an azide transferring agent to form the corresponding azide (see for example, Suzuki, H.; Miyoshi, K.; Shmoda, M Bull Chem Soc. Jpn, 1980, 53, 1765). This azide can then be reduced in a conventional manner to form the amine substituent by reducing it with commonly used reducing agent for converting azides to amines (see for example, Soai, K.; Yokoyama, S.; Ookawa, A Synthesis, 1987, 48). In order to prepare the compound of formula N where one of R1 and R2 is cyano and the other is amino, the compound of formula N where one of R1 and R2 is nitro and other is ammo can be used as a starting matenal The ammo group is converted to cyano by conventional means of converting aryl-amino to aryl-cyano, for example by diazotization with a cyanide-transfemng agent such as cuprous cyanide The nitro group is converted to an ammo group as descnbed above
If it is desired to convert commercially available compounds to compounds of formula N where one of R1 and R2 is cyano and the other is any other desired substituent as defined above, the compound of formula V where one of R1 and R2 is nitro and the other is halo is used as starting matenal With this starting matenal, the nitro is converted to the cyano and the halo is converted to the desired R! or R" substituent
If it is desired to produce the compound of formula V where both R1 and R2 are cyano, this can be prepared as descπbed hereinbefore from compounds where R1 and R2 are ammo via diazotization and reaction with a cyanide-transferπng agent such as cuprous cyanide
1 9
If it is desired to produce the compound of formula N wherein one of R or R is -C(O)OR5, this compound can be formed from the coπesponding compound where R1 and R2 is an ammo group by converting the amino group to a diazonium salt reacting the diazonium salt with a hydrohahc acid to form the coπespondmg halide and then reacting this halide with a Gngnard reagent to produce the coπespondmg acid which can be esteπfied On the other hand, if one wants to produce the compound of formula N where both R1 and R2 are carboxylic acid groups This compound can be produced as descnbed above from the coπesponding compound of formula V where both R1 and R2 are ammo groups In the same manner, the ammo groups m the compound of formula V can be converted to the corresponding compound where R1 or both of R1 or R2 is -OR5 by simply reacting the ammo group with sodium nitrate in sulfuπc acid to convert the ammo group to a hydroxy group and thereafter ethenfymg, if desired, the hydroxy group
The substituents which form R1 and R2 can be added to the πng after conversion of the compound of formula Xu to the compounds of formulae I-a, I-b, I-c or I-d Hence, all of the reactions descnbed to produce vaπous substituents of R1 and R2 in the compound of formula I can also be earned out on the compounds of formulae I-a, I-b I-c or l-d
In the first step of this Reaction Scheme, the alkyl halide of formula VI is reacted with the compound of formula N, to produce the compound of formula NH. In this reaction, if in the compounds of formula V, R1 or R2 is an ammo group, such ammo group(s) have to be protected before carrying out the alkylation reaction with the alkyl halide of formula VI The ammo group can be protected with any conventional acid removable group (for example, for t-butyloxycarbonyl group see, Bodanszky, M. Principles of Peptide Chemistry, Springer -Verlag, New York, 1984, p 99). The protecting group has to be removed from the amino groups after prepaπng the coπesponding amme protected compounds of formulae I-a, I-b, I-c or I-d to obtain the coπesponding amines The compound of formula N is an organic acid having an alpha carbon atom and the compound of formula VI is an alkyl halide so that alkylation occurs at the alpha carbon atom of this carboxylic acid This reaction is earned out by any conventional means of alkylation of the alpha carbon atom of a lower alkyl ester of a carboxylic acid. Generally, m these alkylation reactions any alkyl halide is reacted with the anion generated from any acetic acid ester. The anion can be generated by using a strong organic base such as lithium dusopropylamide, n-butyl lithium as well as other organic lithium bases. In carrying out this reaction, low boiling ether solvents are utilized such as tetrahydrofuran at low temperatures from -80°C to about -10°C being preferred. However, any temperature from -80°C to room temperature can be used.
The compound of formula Nπ can be converted to the compound of formula XII by any conventional procedure to convert a carboxylic acid ester to an acid. The compound of formula XU can then be condensed with the compound of formula VIE via conventional peptide coupling to produce the compound of formula I-d. In carrying out this reaction, any conventional method of condensing a pπmary amine with a carboxylic acid can be utilized to effect this conversion. The required ammo heteroaromatic compounds of formula Nm, are commercially available or can be prepared from the reported literature. The heteroaromatics of formula NED-, wherein one of the substitutions is -(CH2)nCOOR7, where n = 0, 1, 2, 3, or 4 can be prepared from the coπespondmg carboxylic acid Any conventional carbon homologation methods to convert a lower carboxylic acid to its higher homologs, (see for example, Skeean, R. W.; Goel, O. P. Synthesis, 1990, 628) which then can be converted to the corresponding lower alkyl esters using any conventional esteπfication methods can be utilized. The heteroaromatics of formula NHJ, wherein one of the claimed substitutions is -(CH2) nOR6, where n = 0, 1, 2, 3, or 4 can be prepared from the coπesponding carboxylic acid Any conventional carbon homologation methods to convert a lower carboxylic acid to its higher homologs, which then can be converted to the coπesponding alcohols using any conventional ester reduction methods can be utilized. The heteroaromatics of formula Nm, wherein one of the substituents is -COCOOR8, can be prepared from the coπespondmg halogen. Any conventional acylation method to convert an aromatic or heteroaromatic halogen to its oxoacetic acid lower ester deπvative (see for example, Hayakawa, K.; Yasukouchi, T.; Kanematsu, K. Tetrahedron Lett, 1987, 28, 5895) can be utilized.
On the other hand, the carboxylic acid of the formula Xu can be converted to the amide of the formula IX. This reaction is earned out by using conventional means for converting the acid of formula Xu to an acid chlonde and thereafter treating this acid chlonde with ammonia or an ammonia-producmg compound such as hexamethyl disilazane. Conditions which are conventional for converting an acid to an acid chloπde can be utilized in this procedure. This acid chloπde when reacted under conventional conditions with ammonia as descπbed will produce the amide of formula IX. The compound of formula IX when reacted with an alkyl, alkenyl, or -(CH2)nC(O)OR5 isocyanate of formula X forms the urea adduct of formula I-a. Any conventional method ooff rreeaaccttiinngg aallkkyyll,, aallkkeennyyll,, oorr --((CCHH22))ππCC((OO))OORR55 iissooccyyaannaattee v with an amide to form a urea linkage can be utilized to form the compound of formula I-a. When R41 is a lower alkenyl group in the compound of formula I-a, this compound can be converted to the corresponding hydroxy lower alkyl group by conventional hydroboration at the olefinic group to produce a coπesponding hydroxy group The hydroxy group, if desired, can be converted to a halo group Any method of halogenating a hydroxy group can be used in accordance with this invention
On the other hand, if it is desired to produce the compound of formula I-b the compound of formula XII is first converted to the methyl ester of formula XI, and thereafter reacted with urea to produce the compound of forumula I-b This reaction is earned out by utilizing any conventional means of reacting a methyl ester with urea to form the coπespondmg condensation product
The compound of formula I-c, I e the compound of formula I wherein R4 -C(O)NHR40 and R40 is -CO-(CH2)n-C(O)OR°, is produced from the monoacid chloπde XIH of the monoester of the coπespondmg dicarboxy c acid The monoacid chloπde Xiπ is coupled with the compounds of formula I-b using standard coupling methods The compound of formula VII has an asymmetπc carbon atom through which the group -CH2R3 and the acid amide substituents are connected In accordance with this invention, the prefeπed stereoconfiguration of this group is R
If it is desired to produce the R or the S isomer of the compound of formula I, this compound can be separated into these isomers by any conventional chemical means Among the prefeπed chemical means is to react the compound of formula Xu with an optically active base Any conventional optically active base can be utilized to carry out this resolution Among the preferred optically active bases are the optically active amine bases such as alpha-methylbenzylamme, quinine, dehydroabietylamine and alpha- methylnaphthylamine Any of the conventional techniques utilized in resolving organic acids with optically active organic am e bases can be utilized in carrying out this reaction
In the resolution step, the compound of formula Xu is reacted with the optically active base m an inert organic solvent medium to produce salts of the optically active amine with both the R and S isomers of the compound of formula XU In the formation of these salts, temperatures and pressure are not critical and the salt formation can take place at room temperature and atmospheric pressure. The R and S salts can be separated by any conventional method such as fractional crystallization. After crystallization, each of the salts can be converted to the respective compounds of formula XII in the R and S configuration by hydrolysis with an acid. Among the prefeπed acids are dilute aqueous acids, i.e., from about 0.001N to 2N aqueous acids, such as aqueous sulfuric or aqueous hydrochloric acid. The configuration of formula XII which is produced by this method of resolution is carried out throughout the entire reaction scheme to produce the desired R or S isomer of formula I. The separation of R and S isomers can also be achieved using an enzymatic ester hydrolysis of any lower alkyl esters coπesponding to the compound of the formula XU (see for example, Ahmar, M.; Girard, C; Bloch, R, Tetrahedron Lett, 1989, 7053), which results in the formation of coπesponding chiral acid and chiral ester. The ester and the acid can be separated by any conventional method of separating an acid from an ester. The prefeπed method of resolution of racemates of the compounds of the formula XU is via the formation of corresponding diastereomeric esters or amides. These diastereomeric esters or amides can be prepared by coupling the carboxylic acids of the formula XU with a chiral alcohol, or a chiral amine. This reaction can be carried out using any conventional method of coupling a carboxylic acid with an alcohol or an amine. The coπesponding diastereomers of compounds of the formula XJJ can then be separated using any conventional separation methods. The resulting pure diastereomeric esters or amides can then be hydrolyzed to yield the coπesponding pure R or S isomers. The hydrolysis reaction can be carried out using conventional known methods to hydrolyze an ester or an amide without racemization.
All of the compounds of formula I which include the compounds set forth in the Examples, activated glucokinase in vitro by the procedure of Example A. In this manner, they increase the flux of glucose metabolism which causes increased insulin secretion.
Therefore, the compounds of formula I are glucokinase activators useful for increasing insulin secretion. The following compounds were tested and found to have excellent glucokinase activator in vivo activity when administered orally in accordance with the assay descπbed in Example B
3-Cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-thιazol-2-yl-propιonamιde, 3-Cyclopentyl-N-thιazol-2-yl-2-(4-tπfluoromethoxy-phenyl)-propιonamιde,
3-Cyclopentyl-N-thιazol-2-yl-2-(4-tnfluoromethanesulfonyl-phenyl)-propιonamιde, 3-Cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-N-pyπdιn-2-yl-propιonamιde,
6-[3-Cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonylamιno]-nιcotιnιc acid methyl ester, N-(5-Chloro-pyπdm-2-yl)-3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonamιde,
3-Cyclopentyl-N-pyndm-2-yl-2-(4-tnfluoromethanesulfonyl-phenyl)-propιonamιde,
3-Cyclopentyl-N-(5-methyl-pyπdιn-2-yl)-2-(4-tπfluoromethanesulfonyl-phenyl)- propionamide,
3-Cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-N-(5-hydroxymethyl-pyndιn-2-yl) propionamide,
6-[3-Cyclopentyl-2-(4-tπfluoromethanesulfonyl-phenyl)-propιonylamιno]-nιcotmιc acid methyl ester,
3-Cyclopentyl-2-(3-fluoro-4-tπfluoromethyl-phenyl)-N-pyπdm-2-yl-propιonamιde,
3-Cyclopentyl-2-(4-methanesulfonyl-3-nιtrophenyl)-N-pyπdm-2-yl-propιonamιde, 2-(3-Bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyndιn-2-yl-propιonamιde,
2-(3-Cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyndm-2-yl-propιonarmde,
2-(4-Chloro-3-nιtro-phenyl)-3-cyclopentyl-N-pyπdιn-2-yl-propιonarmde,
2-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyπdm-2-yl-propιonarmde,
N-(5-Bromo-pyndm-2-yl)-2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionamide,
2-[3-Chloro-4-methanesulfonyl-phenyl]-3-cyclopentyl-N-thιazol-2-yl-propιonamιde,
(2R)-3-Cyclopentyl-2-(4-methanesulfonylphenyl)-N-thιazol-2-yl-propιonarmde,
2-(3-Bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde,
2-(3-Cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, 3-Cyclopentyl-2-(4-ethanesulfonyl-phenyl)-N-thιazol-2-yl-propιonamιde,
3-Cyclopentyl-2-(4-methanesulfonyl-3-tπfluoromethyl-phenyl)-N-thιazol-2-yl- propionamide, and
N-(5-Bromo-pyπdm-2-yl)-2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- propi on amide Furthermore, the following compounds were tested and found to have excellent glucokinase activator in vivo activity when administered orally in accordance with the assay descπbed in Example B: l-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonyl]-3-ethyl-urea, l-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonyl]-3-methyl-urea; l-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-3-methyl urea, l-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propιonyl]-3-methyl urea; l-Allyl-3-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonyl]-urea. l-[2-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonyl]-3-methyl-urea; l-[2-(3-Bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonyl]-3-methyl-urea; and l-[2(R)-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonyl]-3-methyl-urea
On the basis of their capability of activating glucokinase, the compounds of formula I can be used as medicaments for the treatment of type II diabetes. Therefore, as mentioned earlier, medicaments containing a compound of formula I are also an object of the present invention, as is a process for the manufacture of such medicaments, which process compnses bnngmg one or more compounds of formula I and, if desired, one or more other therapeutically valuable substances into a galenical administration form.
The pharmaceutical compositions may be administered orally, for example m the form of tablets, coated tablets, dragees, hard or soft gelatine capsules, solutions, emulsions or suspensions. Administration can also be earned out rectally, for example using suppositones; locally or percutaneously, for example using ointments, creams, gels or solutions; or parenterally, e.g. intravenously, intramuscularly, subcutaneously, intrathecally or transdermally, using for example injectable solutions. Furthermore, administration can be carried out sublingually or as an aerosol, for example in the form of a spray For the preparation of tablets, coated tablets, dragees or hard gelatine capsules the compounds of the present invention may be admixed with pharmaceutically inert, inorganic or organic excipients. Examples of suitable excipients for tablets, dragees or hard gelatine capsules include lactose, maize starch or denvatives thereof, talc or stearic acid or salts thereof Suitable excipients for use with soft gelatine capsules include for example vegetable oils, waxes, fats, semi-solid or liquid polyols etc.; according to the nature of the active ingredients it may however be the case that no excipient is needed at all for soft gelatine capsules For the preparation of solutions and syrups, excipients which may be used include for example water, polyols, saccharose, invert sugar and glucose For injectable solutions, excipients which may be used include for example water, alcohols, polyols, glyceπne, and vegetable oils For suppositones, and local or percutaneous application, excipients which may be used include for example natural or hardened oils, waxes, fats and semi-solid or liquid polyols.
The pharmaceutical compositions may also contain preserving agents, solubihsmg agents, stabilising agents, wetting agents, emulsifiers, sweeteners, colorants, odorants, salts for the vanation of osmotic pressure, buffers, coating agents or antioxidants As mentioned earlier, they may also contain other therapeutically valuable agents. It is a prerequisite that all adjuvants used in the manufacture of the preparations are non-toxic
Preferred forms of use are intravenous, intramuscular or oral administration, most prefeπed is oral administration The dosages in which the compounds of formula (I) are administered in effective amounts depend on the nature of the specific active ingredient, the age and the requirements of the patient and the mode of application. In general, dosages of about 1-100 mg/kg body weight per day come into consideration
This invention will be better understood from the following examples, which are for purpose of illustration and are not intended to limit the invention defined the claims that follow thereafter Example 1 (A) 3-Cyclopentyl-2-(3,4-dichlorophenyl)-N-thiazol-2-yl-propionamide:
Figure imgf000044_0001
A solution of 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid (prepared m Example 38, 2 0 g, 6 96 mmol), benzotπazol-l-yloxy-tπs(dιmethylammo)phosphonιum hexafluorophosphate (4 62 g, 10 44 mmol). and 2-amιnothιazole (1 05 g, 10 44 mmol) in methylene chlonde (50 mL) at 25°C was treated with tnethylamme (2 9 mL, 20 88 mmol) The reaction mixture was stirred for 14 h The reaction mixture was then diluted with water (10 mL) and extracted with methylene chlonde (3 x 10 mL) The combined organic layers were sequentially washed with water (1 x 10 mL), a IN aqueous sodium hydroxide solution (1 x 10 mL), a IN aqueous hydrochlonc acid solution (1 x 10 mL), and a saturated aqueous sodium chloπde solution (1 x 10 mL) The organic layer was dπed over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh. 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl- 2-(3,4-dιchlorophenyl)-N-thιazol-2-yl-propιonamιde (2 48 g, 96%) as a white solid: mp 143 5-145 5°C; EI-HRMS m/e calcd for C17Hι8Cl2N2OS (M ") 368.0516, found 368.0516
(B) In an analogous manner, there were obtained:
(a) From 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid and 2-(ammo-thιazol-4-yl)- oxo-acetic acid ethyl ester |2-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionylammo]- thιazol-4-yl} -oxo-acetic acid ethyl ester as a white solid- mp 134-136°C, FAB-HRMS m e calcd for C2ιH22Cl2N2O4S (M+H)+ 469 0755, found 469 0746
(b) From 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid and 2-(ammo-thιazol-5-yl)- oxo-acetic acid ethyl ester {2-[3-Cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]- thιazol-5-yl}-oxo-acetιc acid ethyl ester as a white solid: mp 129-131°C; FAB-HRMS m/e calcd for C2ιH22Cl2N2O4S (M+H)+ 469.0755, found 469.0765.
(c) From 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid and (2-ammo-thiazol-4-yl)- acetic acid ethyl ester. {2-[3-Cyclopentyl-2~(3,4-dιchlorophenyl)-propιonylammo]- thιazol-4-yl} -acetic acid ethyl ester as a yellow solid: mp 138-139°C; FAB-HRMS m/e calcd for C2ιH24Cl2N2O3S (M+H)+ 455.0963, found 455.0960.
(d) From 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid and 2-ammo-5- methylthiazole 3-Cyclopentyl-2-(3,4-dιchlorophenyl)-N-(5-methyl-thιazol-2-yl)- propionamide as a white solid: mp 142-143°C; EI-HRMS m/e calcd for Cι8H20Cl2N2OS (M+) 382.0673, found 382.0679.
(e) From 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιomc acid and 2-amιno-4- methylthiazole: 3-Cyclopentyl-2-(3,4-dιchlorophenyl)-N-(4-methyl-thιazol-2-yl)- propionamide as a white foam: mp 151-152°C, FAB-HRMS m/e calcd for Cι8H20Cl2N2OS (M+H)+ 383.0751, found 383.0758. (f) From 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιomc acid and 2-amιno-thιazole-4- carboxy c acid ethyl ester 2-[3-Cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]- thιazole-4-carboxylιc acid ethyl ester as a white solid: mp 104-107°C; FAB-HRMS m e calcd for C20H22C12N2O3S (M+H)+ 441.0807, found 441.0808.
(g) From 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιomc acid and 2-amιno-thιazole-5- carboxylic acid ethyl ester: 2-[3-Cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]- thιazole-5-carboxylιc acid ethyl ester as a light yellow solid: mp 136-137°C; FAB-HRMS m/e calcd for C20H22C12N2O3S (M+H)+ 441.0807, found 441.0803.
(h) From 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid and 2-ammo-5- mtrothiazole: 3-Cyclopentyl-2-(3,4-dιchlorophenyl)-N-(5-nιtro-thιazol-2-yl)- propionamide as an orange solid mp 67-71°C, FAB-HRMS m/e calcd for C]7Hι7Cl2N3O3S (M+H)+ 414.0446, found 414.0442.
(I) From 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid and 2-amιno-thιazole-4- carboxy c acid amide: 2-[3-Cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]- thιazole-4-carboxylιc acid amide as a light orange solid: mp 120-122°C; EI-HRMS m/e calcd for C18H19Cl2N3O2S (M+) 411.0575, found 411.0572
Example 2 2-(4-Bromo-phenyl)-3-cyclopentyl-N-thiazol-2-yl-propionamide
Figure imgf000046_0001
A solution of dnsopropylamine (7.7 mL, 54.88 mmol) in dry tetrahydrofuran (23 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pyπmιdιnone (10 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butylhthium in hexanes (22.0 mL, 54.88 mmol). The resulting reaction mixture was stiπed at -78°C for 30 mm and then treated dropwise with a solution of 4-bromophenylacetιc acid (5.62 g, 26.13 mmol) in dry tetrahydrofuran (23 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdmone (10 mL) The reaction mixture turned dark m color and was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (5.76 g, 27.44 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stirred for 24 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran. The aqueous residue was acidified using a 10% aqueous hydrochlonc acid solution. The resulting aqueous layer was extracted with ethyl acetate (2 x 100 mL). The combined organic extracts were dπed over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(4-bromo- phenyl)-3-cyclopentyl-propιomc acid (3.88 g, 50%) as a light yellow solid: mp 91-93°C; EI-HRMS m/e calcd for C14HπBrO2 (NT) 296.0412, found 296.0417. A solution of 2-(4-bromo-phenyl)-3-cyclopentyl-propιonιc acid (1.01 g, 3.39 mmol) in methylene chloπde (8.5 mL) was treated with 2 drops of dry N,N-dιmethylformamιde The reaction mixture was cooled to 0°C and then treated with oxalyl chlonde (3 mL, 33 98 mmol). The reaction mixture was stirred at 0°C for 10 mm and then stiπed at 25°C for 15 h The reaction mixture was concentrated in vacuo The resulting yellow oil was dissolved m a small amount of methylene chloπde and slowly added to a cooled solution (0°C) of 2-amιnothιazole (680 6 mg, 6.79 mmol) and N,N-dιιsopropylethylamιne (1.2 mL. 6 79 mmol) m methylene chloπde (17 mL) The resulting reaction mixture was stirred at 0°C for 10 mm and then at 25°C for 15 h The reaction mixture was concentrated in vacuo to remove methylene chloπde The resulting residue was diluted with ethyl acetate (200 mL) The organic phase was washed with a 10% aqueous hydrochloπc acid solution (2 x 100 mL), washed with a saturated aqueous sodium bicarbonate solution (2 x 100 mL), and washed with a saturated aqueous sodium chlonde solution (1 x 100 mL) The organic layer was then dned over sodium sulfate, filtered, and concentrated in vacuo to afford 2-(4-bromo-phenyl)-3-cyclopentyl-Ν-thιazol-2-yl- propionamide (1.23 g, 95%) as an orange solid which was used m subsequent reactions without further puπfication An analytical sample was recrystallized from ethyl acetate to provide a cream solid, mp 201-202°C; EI-HRMS m/e calcd for C]7Hι9BrN2OS (M+) 378 0401, found 378.0405
Example 3 (A) 3-CyclopentyI-2-(4-methanesulfonyl-phenyI)-N-thiazol-2-yI-propionamide
Figure imgf000047_0001
A solution of dπsopropylamine (3.3 mL, 23.5 mmol) in dry tetrahydrofuran (50 mL) and 1.3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pyπmιdιnone (10 mL) was cooled to -78°C under nitrogen and then treated with a 10M solution of n-butyllithium m hexanes (2.35 mL, 23 5 mmol) The yellow reaction mixture was stiπed at -78°C for 30 mm and then treated dropwise with a solution of 4-methylsulfonylphenylacetιc acid (2.40 g, 11.2 mmol) in a small amount of dry tetrahydrofuran. After approximately one-half of the 4- methylsulfonylphenylacetic acid m dry tetrahydrofuran was added, a precipitate formed Upon further addition of the remaining 4-methylsulfonylphenylacetιc acid in dry tetrahydrofuran, the reaction mixture became thick in nature After complete addition of the 4-methylsulfonylphenylacetιc acid in dry tetrahydrofuran, the reaction mixture was very thick and became difficult to stir An additional amount of dry tetrahydrofuran (20 mL) was added to the thick reaction mixture, and the reaction mixture was stirred at -
78 C for 45 mm, at which time, a solution of lodomethylcyclopentane (2.35 g, 11.2 mmol) in a small amount of dry tetrahydrofuran was added dropwise The reaction mixture was allowed to warm to 25°C where it was stiπed for 15 h. The reaction mixture was quenched with water (100 mL), and the resulting yellow reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The aqueous residue was acidified to pH = 2 using concentrated hydrochloπc acid The aqueous layer was extracted with ethyl acetate The organic phase was dπed over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propιonιc acid (1.80 g, 52%) as a white solid: mp 152-154°C; EI-HRMS m/e calcd for C15H20O4S (Nf) 296.1082, found 296.1080
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propιonιc acid (4.91 g, 16.56 mmol) and tnphenylphosphine (6.52 g, 24.85 mmol) m methylene chloπde (41 mL) was cooled to 0°C and then treated with N-bromosuccinimide (5.01 g, 28.16 mmol) m small portions The reaction mixture color changed from light yellow to a darker yellow then to brown After the complete addition of N-bromosuccinimide, the reaction mixture was allowed to warm to 25°C over 30 min. The brown reaction mixture was then treated with 2-aminothiazole (4.98 g, 49.69 mmol). The resulting reaction mixture was stiπed at 25°C for 19 h. The reaction mixture was then concentrated in vacuo to remove methylene chloride. The remaining black residue was diluted with a 10% aqueous hydrochloric acid solution (400 mL) and then extracted with ethyl acetate (3 x 200 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate then 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-thiazol-2- yl-propionamide (4.49 g, 72%) as a white solid: mp 216-217°C; EI-HRMS m/e calcd for C18H22N2O3S2 (M+) 378.1072, found 378.1071.
(B) In an analogous manner, there were obtained:
(a) From 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propionic acid and 2- aminothiazole-4-carboxylic acid methyl ester: 2-[3-Cyclopentyl-2-(4-methanesulfonyl- phenyl)-propionylamino]-thiazole-4-carboxylic acid methyl ester as a tan solid: mp 126- 128°C; EI-HRMS m/e calcd for C2oH24N2O5S2 (M+) 436.1127, found 436.1119.
(b) From 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propionic acid and 2- aminothiazole-4-carboxylic acid ethyl ester: 2-[3-Cyclopentyl-2-(4-methanesulfonyl- phenyl)-propionylamino]-thiazole-4-carboxylic acid ethyl ester as a light yellow solid: mp 101-103°C; EI-HRMS m/e calcd for C2,H26N2O5S2 (M+) 450.1283, found 450.1284.
(c) From 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propionic acid and methyl 2- amino-4 thiazoleacetate: { 2-[3-Cyclopentyl-2-(4-methanesulfonyl-phenyl)- propionylamino]-thiazol-4-yl}-acetic acid methyl ester as a yellow solid: mp 63-65°C; EI- HRMS m/e calcd for C21H26N2O5S2 (M+) 450.1283, found 450.1294.
(d) From 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propionic acid and ethyl 2-amino- 4-thiazoleacetate: {2-[3-Cyclopentyl-2-(4-methanesulfonyl-phenyl)-propionylamino]- thιazol-4-yl} -acetic acid ethyl ester as a light yellow solid: mp 61-63°C; EI-HRMS m/e calcd for C22H28N2O5S2 (M+) 464.1440, found 464.1431.
Example 4 2-(4-Amino-phenyl)-3-cyclopentyl-N-thiazol-2-yl-propionamide
Figure imgf000050_0001
A solution of 3-cyclopentyl-2-(4-nιtro-phenyl)-N-thιazol-2-yl-propιonamιde (prepared in Example 22, 345 mg, 1.0 mmol) in ethyl acetate (100 mL) was treated with 10% palladium on activated carbon (34.5 mg). The reaction mixture was stiπed under hydrogen gas at 60 psi at 25°C for 6 h. The catalyst was then filtered off through a pad of celite (ethyl acetate). The filtrate was concentrated in vacuo to give 2-(4-ammo-phenyl)- 3-cyclopentyl-N-thιazol-2-yl-propιonamιde (288.3 mg, 91 4%) as a yellow solid: mp 102- 107°C, EI-HRMS m/e calcd for C17H21N3OS (M+) 315.1405, found 315.1401.
Example 5 2-(3-Amino-phenyl)-3-cyclopentyI-N-thiazol-2-yl-propionamide
Figure imgf000050_0002
A solution of (3-nιtro-phenyl)-acetιc acid (5.0 g, 27.6 mmol) in methanol (50 mL) was treated with a catalytic amount of sulfunc acid. The reaction mixture was refluxed for 48 h. The reaction was then concentrated in vacuo. The residue was dissolved in methylene chloride (50 mL) and washed with a saturated aqueous sodium bicarbonate solution (2 x 25 mL), water (1 x 50 mL), and a saturated aqueous sodium chloride solution (1 x 50 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo to give (4-nitro-phenyl)-acetic acid methyl ester (5.27 g, 97.9%) as a pale yellow solid: mp 29-30°C; EI-HRMS m e calcd for C9H9NO4 (M +) 195.0531, found 195.0532.
A solution of freshly prepared lithium dusopropylamide (43.3 mL of a 0.3M stock solution, 12.99 mmol) cooled to -78°C was treated with (3-nitro-phenyl)-acetic acid methyl ester (2.45 g, 12.56 mmol) in tetrahydrofuran/l,3-dimethyl-3,4,5,6-tetrahydro- 2(lH)-pyrimidinone (32 mL, 3:1). The resulting solution was stirred at -78°C for 45 min. Iodomethylcyclopentane (2.78 g, 13.23 mmol) was then added in l,3-dimethyl-3,4,5,6- tetrahydro-2(lH)-pyrimidinone (2.78 mL), and the mixture was stiπed at -78°C for 3 h. The reaction was warmed to 25°C and was stiπed at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (25 mL) and was concentrated in vacuo. The residue was diluted with water (50 mL) and extracted with ethyl acetate (3 x 50 mL). The organics were washed with a saturated aqueous lithium chloride solution (2 x 25 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3-nitro-phenyl)-propionic acid methyl ester (1.63 g, 46.8%) as pale yellow oil: EI-HRMS m/e calcd for Cι5Hι9NO4 (M+) 277.1314, found 277.1317.
A solution of 3-cyclopentyl-2-(3-nitro-phenyl)-propionic acid methyl ester (0.55 g, 2.0 mmol) in tetrahydrofuran/water (10 mL, 3: 1) was treated with lithium hydroxide (185 mg, 4.40 mmol). The reaction was stiπed at 25°C for 48 h. The tetrahydrofuran was then removed in vacuo. The residue was diluted with water (25 mL) and extracted with ether (1 x 20 mL). The aqueous layer was acidified to pH = 2 with a 3N aqueous hydrochloric acid solution The product was extracted into methylene chlonde (3 x 25 mL), washed with a saturated aqueous sodium chlonde solution (2 x 25 mL), dned over sodium sulfate, filtered, and concentrated in vacuo to give 3-cyclopentyl-2-(3-nιtro-phenyl)-propιonιc acid (0 48 g, 91.9%) as a tan solid- mp 95-99°C; EI-HRMS m/e calcd for Cι4H,7NO4 (M+) 263.1157, found 263.1156
A solution of 3-cyclopentyl-2-(3-nιtro-phenyl)-propιonιc acid (432 mg, 1.64 mmol) m methylene chloπde (16 mL) was cooled to 0°C and then treated with a 2.0M solution of oxalyl chloπde m methylene chlonde (0.90 mL, 1.80 mmol) and a few drops of N,N- dimethylformamide The reaction mixture was stirred at 0°C for 15 mm and at 25°C for 1.2 h The reaction mixture was then treated with a solution of 2-amιnothιazole (361.4 mg, 3.61 mmol) in tetrahydrofuran (16 mL) and N,N-dnsopropylethylamme (0 70 mL, 3.93 mmol). The reaction mixture was stiπed at 25°C for 6 h At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh 70/30 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(mtrophenyl)-Ν-thιazol-2-yl- propionamide (409 3 mg, 72.2%) as a tan solid: mp 171-174°C; EI-HRMS m/e calcd for C17H19N3O3S (M j 345.1147, found 345.1153
A solution of 3-cyclopentyl-2-(nιtrophenyl)-N-thιazol-2-yl-propιonamιde (327.8 mg, 0.95 mmol) in ethyl acetate (25 mL) was treated with 10% palladium on activated carbon. The reaction mixture was stirred under hydrogen gas at 60 psi at 25°C for 3 h. The catalyst was then filtered off through a pad of cehte (ethyl acetate). The filtrate was concentrated in vacuo to give 2-(3-ammo-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde (310 mg, 100%) as a white solid: mp 158-160°C; EI-HRMS m e calcd for CπH21N3OS (M+) 315.1405, found 315.1405. Example 6 2-(3-Chloro-phenyl)-3-cyclopentyl-N-thiazol-2-yl-propionamide
Figure imgf000053_0001
(3-Chloro-phenyl)-acetιc acid (6.03 g, 0.03 mol) was dissolved in ethanol (37.7 mL) and treated with a catalytic amount of sulfuπc acid The reaction mixture was refluxed for 12 h. The reaction was concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded (3-chloro-phenyl)-acetιc acid ethyl ester (6 10 g, 86.8%) as a clear oil: EI-HRMS m/e calcd for C10HπClO2 (M+) 198.0448, found 198.0442
A solution of freshly prepared lithium dusopropylamide (23 mL of 0.31M stock solution, 7.13 mmol) cooled to -78°C was treated with (3-chloro-phenyl)-acetιc acid ethyl ester (1.28 g, 6.48 mmol) m tetrahydrofuran/hexamethylphosphoramide (16.1 mL, 3: 1) The resulting solution was stiπed at -78°C for 45 m . At this time, the reaction was treated with a solution of lodomethylcyclopentane (1.50 g, 7.13 mmol) in hexamethylphosphoramide (1 mL). The reaction mixture was stirred at -78°C for 4 h. The reaction was warmed to 25°C and stiπed at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloπde solution (20 mL). This mixture was poured into water (100 mL) and extracted with ethyl acetate (3 x 50 mL). The organics were dπed over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded 2-(3-chloro-phenyl)-3-cyclopentyl-propιonιc acid ethyl ester (1.70 g, 93%) as a yellow oil: EI-HRMS m/e calcd for C16H21ClO2 (M+) 280.1230, found 280.1238. A mixture of 2-(3-chloro-phenyl)-3-cyclopentyl-propιonιc acid ethyl ester (1.70 g, 6.05 mmol) and methyl urea (673 mg, 9.08 mmol) in a solution of magnesium methoxide in methanol (7 4 wt%, 17.3 mL, 12.1 mmol) was refluxed at 100°C for 6 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded l-[2-(3-chloro-phenyl)-3- cyclopentyl-propιonyl]-3-methyl-urea (149.1 mg, 8 %) as a white solid: mp 52-55°C; EI- HRMS m/e calcd for Cι6H2ιClN2O2 (M+) 308.1292, found 308.1287. The methyl ester of the starting matenal was recovered from the reaction mixture due to transestenfication.
A mixture of 2-(3-chloro-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (113 mg, 0 42 mmol) and 2-ammothιazole (84 mg, 0.84 mmol) in a solution of magnesium methoxide m methanol (7 4 wt%, 2.4 mL, 1.69 mmol) was refluxed at 100°C for 20 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 2-(3-chloro-phenyl)-3- cyclopentyl-N-thιazol-2-yl-propιonamιde (87 mg, 53%) as a white solid: mp 138.8- 141.2°C; EI-HRMS m/e calcd for C17H19ClN2OS (M+) 334.0906, found 334.0907.
Example 7 2-(4-Chloro-phenyl)-3-cyclopentyI-N-thiazol-2-yl-propionamide
Figure imgf000054_0001
A solution of (4-chloro-phenyl)-acetιc acid (6.29 g, 0.03 mol) in ethanol (38.4 mL) was treated with a catalytic amount of sulfuπc acid. The reaction mixture was refluxed for 12 h. The reaction was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded (4-chloro-phenyl)-acetιc acid ethyl ester (6.45 g, 88%) as a pale yellow solid: mp 39-41°C; EI-HRMS m/e calcd for C10H.1CIO2 (M+) 198.0448, found 198.0452.
A solution of freshly prepared lithium dusopropylamide (23.0 mL of 0.31M stock solution, 7.13 mmol) cooled to -78°C was treated with (4-chloro-phenyl)-acetιc acid ethyl ester (1.28 g, 6.48 mmol) in tetrahydrofuran hexamethylphosphoramide (16.1 mL, 3:1). The resulting solution was stirred at -78°C for 45 mm At this time, the reaction was treated with a solution of lodomethylcyclopentane (1.50 mg, 7.13 mmol) in hexamethylphosphoramide (1 mL). The reaction mixture was stiπed at -78°C for 4 h. The reaction was warmed to 25°C and stiπed at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloπde solution (20 mL). This mixture was poured into water (100 mL) and extracted with ethyl acetate (3 x 50 mL). The organics were dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded 2-(4-chloro-phenyl)-3-cyclopentyl-propιomc acid ethyl ester (1.65 g, 90 9%) as a yellow oil: EI-HRMS m/e calcd for d6H2ιCl2O2 (M+) 280.1230, found 280.1227.
A mixture of 2-(4-chloro-phenyl)-3-cyclopentyl-propιomc acid ethyl ester (1.65 g, 5.89 mmol) and methyl urea (654 mg, 8.83 mmol) in a solution of magnesium methoxide in methanol (7.4 wt%, 16.9 mL, 11.78 mmol) was refluxed at 100°C for 6 h. The reaction mixture was then concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded l-[2-(4-chloro-phenyl)-3- cyclopentyl-propιonyl]-3-methyl-urea (105.3 mg, 5.8 %) as a white solid: mp 145-147°C; EI-HRMS m e calcd for Cι6H2ιClN2O2 (M+) 308.1292, found 308.1291. The methyl ester of the starting matenal was recovered from the reaction mixture due to transestenfication. A mixture of 2-(4-chloro-phenyl)-3-cyclopentyl-propionic acid methyl ester (648 mg, 2.43 mmol) and 2-aminothiazole (487 mg, 4.86 mmol) in a solution of magnesium methoxide in methanol (7.4 wt%, 14.0 mL, 9.72 mmol) was refluxed at 100°C for 20 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 2-(4-chloro-ρhenyl)-3- cyclopentyl-N-thiazol-2-yl-propionamide (286 mg, 35%) as a white solid: mp 156.6- 159.8°C; EI-HRMS m/e calcd for Cι7H19ClN2OS (M+) 334.0906, found 334.0910.
Example 8 3- Cyclopentyl-N-thiazol-2-y l-2-(4-trifluoromethyl-phenyI)-propionamide
Figure imgf000056_0001
A solution of freshly prepared lithium dusopropylamide (23 mL of a 0.31M stock solution, 7.13 mmol) cooled to -78°C was treated with (4-trifluoromethyl-phenyl)-acetic acid (693 mg, 3.4 mmol) in tetrahydrofuran/hexamethylphosphoramide (8.5 mL, 3:1). The resulting solution was stiπed at -78°C for 30 min. lodomethylcyclopentane (784 mg, 3.7 mmol) was then added in hexamethylphosphoramide (1 mL). The mixture was stirred at -78°C for 4 h. The reaction was then warmed to 25°C and was stiπed at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (10 mL). The excess solvent was removed in vacuo. The residue was acidified to pH = 1 with a IN aqueous hydrochloric acid solution. The mixture was then poured into water (150 mL) and extracted with ethyl acetate (3 x 100 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-trifluoromethyl-phenyl)-propionic acid (634.9 mg, 65%) as a white solid: mp 94-95°C; EI-HRMS m/e calcd for C15H17F3O2 (M+) 309.1079, found 309.1072.
A solution of 3-cyclopentyl-2-(4-trifluoromethyl-phenyl)-propionic acid (185 mg, 0.64 mmol) in methylene chloride (6.5 mL) was cooled to 0°C and was treated with a 2.0M solution of oxalyl chloride in methylene chloride (0.35 mL, 0.71 mmol) and a few drops of N,N-dimethylformamide. The reaction mixture was stirred at 0°C for 10 min and at 25°C for 30 min. The reaction mixture was then treated with a solution of 2- aminothiazole (142 mg, 1.42 mmol) in tetrahydrofuran (3.23 mL) and N,N- diisopropylethylamine (0.27 mL, 1.55 mmol). The solution was stiπed at 25°C for 5 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl-Ν- thiazol-2-yl-2-(4-trifluoromethyl-phenyl)-propionamide (127 mg, 53.3%) as a white solid: mp 210-212°C; EI-HRMS m/e calcd for Cι8H19F3N2OS (M+) 368.1175, found 368.1170.
Example 9 3-Cyclopentyl-2-(4-methyIsulfanyl-phenyl)-N-thiazoI-2-yl-propionamide
Figure imgf000057_0001
A solution of diisopropylamine (3.2 mL, 23.16 mmol) in dry tetrahydrofuran (10.3 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (3.4 mL) was cooled to -78°C under nitrogen and then treated with a 10M solution of n-butyllithium in hexanes (2.3 mL, 23.16 mmol). The resulting reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of 4-(methylthio)phenylacetic acid (2.01 g, 11.03 mmol) m dry tetrahydrofuran (10.3 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)- pynmidinone (3 4 mL) The reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (2.55 g, 12.13 mmol) in a small amount of dry tetrahydrofuran was added dropwise The reaction mixture was stiπed at - 78°C for 30 min and then allowed to warm to 25°C where it was stirred for 24 h The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (200 mL) The organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)propιonιc acid (1 01 g, 35%) as a cream solid mp 91-93°C, EI-HRMS m/e calcd for Cι5H20O2S (M+) 264.1184, found 264.1177
A solution of 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)propιonιc acid (200 mg, 0.76 mmol) and tπphenylphosphine (198 mg, 0 76 mmol) in methylene chloπde (2 mL) was cooled to 0°C and then treated with N-bromosuccinimide (150 mg, 0.84 mmol) m small portions After the complete addition of N-bromosuccinimide, the reaction mixture was allowed to warm to 25°C over 30 min The reaction mixture was then treated with 2- ammothiazole (160 mg, 1 60 mmol), and the resulting reaction mixture was stirred at 25°C for 15 h The reaction mixture was then concentrated in vacuo to remove methylene chlonde The remaining residue was diluted with water and ethyl acetate. The organic layer was further washed with a IN aqueous hydrochlonc acid solution, washed with a saturated aqueous sodium bicarbonate solution, dned over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) afforded crude 3 -cyclopentyl -2-(4-methylsulfanyl-phenyl)-Ν- thιazol-2-yl-propιonamιde as a yellow solid Recrystal zation from 2/1 hexanes/ethyl acetate afforded pure 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-N-thιazol-2-yl- propionamide (114 mg, 44%) as a white solid: mp 195-196°C; EI-HRMS m/e calcd for C,8H22N2OS2 (M+) 346 1174, found 346.1171.
Example 10 3-Cyclopentyl-N-thiazoI-2-yl-2-(4-trifluoromethylsulfanyl-phenyl)-propionamide
Figure imgf000059_0001
A solution of dnsopropylamme (2.4 mL, 16.80 mmol) m dry tetrahydrofuran (7.5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pyπrmdmone (2.5 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butylhthium hexanes (6.7 mL, 16.80 mmol). The resulting reaction mixture was stirred at -78°C for 30 min and then treated dropwise with a solution of 4-(tnfluoromethylthιo)phenylacetιc acid (1.89 g, 8 00 mmol) m dry tetrahydrofuran (7.5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)- pyπmidmone (2.5 mL) The reaction mixture was allowed to stir at -78°C for 55 mm, at which time, a solution of lodomethylcyclopentane (1.85 g, 8.80 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stiπed for 41 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (300 mL). The organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-trifluoromethylsulfanyl- phenyl)propιonιc acid (1.47 g, 58%) as a cream solid: mp 69-71°C; EI-HRMS m/e calcd for Cι5HI7F3θ2S (M+) 318.0901, found 318.0912. A solution of 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl-phenyl)propιonιc acid (60 mg, 0.19 mmol) and tπphenylphosphme (49.4 mg, 0.19 mmol) in methylene chlonde (471 μL) was cooled to 0°C and then treated with N-bromosuccinimide (36.9 mg, 0.21 mmol) m small portions After the complete addition of N-bromosuccmimide, the reaction mixture was allowed to warm to 25°C over 30 mm The bπght orange reaction mixture was then treated with 2-amιnothιazole (39.6 mg, 0.40 mmol). The resulting reaction mixture was stiπed at 25°C for 18 h. The reaction mixture was then concentrated in vacuo to remove methylene chlonde. The remaining residue was diluted with ethyl acetate (50 mL). The organic layer was washed with a 10% aqueous hydrochlonc acid solution (1 x 50 mL), washed with a saturated aqueous sodium bicarbonate solution (1 x 50 mL), washed with water (1 x 50 mL), dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-Ν-thιazol-2-yl-2-(4-tnfluoromethyl- sulfanyl-phenyl)-propιonamιde (49.9 mg, 66%) as a white foam: mp 58-60°C; EI-HRMS m/e calcd for C,8H19F3N2OS2 (M+) 400.0890, found 400.0895.
Example 11
(A) 3-Cyclopentyl-N-thiazol-2-yl-2-(4-trifluoromethanesulfonyl-phenyl)- propionamide
Figure imgf000060_0001
A solution of dnsopropylamme (2.4 mL, 16.80 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdmone (2.5 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butyllithium in hexanes (6.7 mL, 16.80 mmol). The resulting reaction mixture was stiπed at -78°C for 30 mm and then treated dropwise with a solution of 4-(trifluoromethylthιo)phenylacetιc acid (1.89 g, 8.00 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)- pyπmidmone (2.5 mL). The reaction mixture was allowed to stir at -78°C for 55 min, at which time, a solution of lodomethylcyclopentane (1.85 g, 8.80 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stiπed for 41 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (300 mL) The organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tπfluoromethylsulfanyl- phenyl)propιonιc acid (1 47 g, 58%) as a cream solid: mp 69-71°C; EI-HRMS m/e calcd for Cι5H17F3O2S (M+) 318.0901, found 318.0912.
A solution of 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl-phenyl)propιonιc acid (1.33 g, 4 18 mmol) in methanol (10 mL) was treated slowly with 4 drops of concentrated sulfuπc acid. The resulting reaction mixture was heated under reflux for 36 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The residue was diluted with ethyl acetate (200 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 100 mL), washed with a saturated aqueous sodium chloπde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 97/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl- phenyl)propιonιc acid methyl ester (1.37 g, 99%) as a light yellow oil: EI-HRMS m/e calcd for Cι6Hι9F3O2S (M+) 332.1058, found 332.1052. A solution of 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl-phenyl)propιonιc acid methyl ester (1 14 g, 3 43 mmol) in methylene chloπde (8.6 mL) was treated with 3- chloroperoxybenzoic acid (80-85% grade, 2.00 g based on 80%, 9.26 mmol). The reaction mixture was stiπed at 25°C for 17 h, at which time, thin layer chromatography showed the presence of two new lower Rf products An additional 2.00 g of 3- chloroperoxybenzoic acid was added to the reaction mixture to dnve the conversion of the sulfoxide to the sulfone, and the resulting reaction mixture was stiπed at 25°C for 3 d The reaction mixture was concentrated in vacuo to remove methylene chloπde. The resulting residue was diluted with ethyl acetate (300 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 100 mL), washed with a saturated aqueous sodium chloπde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tπfluoromethanesulfonyl- phenyl)propιomc acid methyl ester (1.19 g, 95%) as a light yellow oil- EI-HRMS m/e calcd for C16H19F3O4S (M+) 364.0956, found 364.0965
A solution of 3-cyclopentyl-2-(4-tπfluoromethanesulfonyl-phenyl)propιonιc acid methyl ester (708.2 mg, 1.94 mmol) m tetrahydrofuran (2.4 mL) was treated with a 0.8M aqueous lithium hydroxide solution (3.6 mL, 2.92 mmol). The reaction mixture was stirred at 25°C for 23 h and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous layer was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (2 x 100 mL) The combined organic layers were washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo to afford a cream solid. This solid was punfied by tnturating with diethyl ether/petroleum ether to provide pure 3-cyclopentyl-2- (4-tπfluoromethanesulfonyl-phenyl)propιomc acid (527.0 mg, 77%) as a white solid: mp 143-145°C, EI-HRMS m e calcd for C15H17F3O4S (M+) 350.0800, found 350.0816 A solution of 3-cyclopentyl-2-(4-tπfluoromethanesulfonyl-phenyl)propιonιc acid (164.0 mg, 0.47 mmol) and tπphenylphosphine (184.2 mg, 0.70 mmol) methylene chlonde (1 2 mL) was cooled to 0°C and then treated with N-bromosuccmimide (141.6 mg, 0.80 mmol) m small portions. After the complete addition of N-bromosuccimmide, the reaction mixture was allowed to warm to 25°C where it was stiπed for 1 h. The reaction mixture was then treated with 2-ammothιazole (140.6 mg, 1.40 mmol) The resulting reaction mixture was stiπed at 25°C for 22 h The reaction mixture was then concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-Ν-thιazol-2-yl-2-(4- tπfluoromethanesulfonyl-phenyl)-propιonamιde (47.9 mg, 24%) as a cream solid: mp 189-191°C, EI-HRMS m/e calcd for Cι8H19F3N2O3S2 (M+) 432.0789, found 432.0791.
(B) In an analogous manner, there were obtained:
(a) From 3-cyclopentyl-2-(4-tπfluoromethanesulfonyl-phenyl)propιonιc acid and 2- ammothιazole-4-carboxylιc acid methyl ester- 2-[3-Cyclopentyl-2-(4- tπfluoromethanesulfonyl-phenyl)-propιonylamιno]-thιazole-4-carboxylιc acid methyl ester as a gray solid: mp 122-125°C; EI-HRMS m/e calcd for C2oH2iF3N2O5S2 (M+) 490 0844, found 490.0844.
(b) From 3-cyclopentyl-2-(4-tπfluoromethanesulfonyl-phenyl)propιonιc acid and 2- amιnothιazole-4-carboxylιc acid ethyl ester: 2-[3-Cyclopentyl-2-(4- tπfluoromethanesulfonyl-phenyl)-propιonylammo]-thιazole-4-carboxyhc acid ethyl ester as a white solid: mp 132-134°C, EI-HRMS m/e calcd for C2iH23F3N2O5S2 (M+) 504.1000, found 504.0988.
(c) From 3-cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)propιonιc acid and methyl 2-amιno-4-thιazoleacetate { 2-[3-Cyclopentyl-2-(4-tπfluoromethanesulfonyl-phenyl)- propιonylammo]-thιazol-4-yl} -acetic acid methyl ester as a yellow foam: mp 48-52°C; EI-HRMS m/e calcd for C2iH23F3N2O5S2 (M+) 504.1000, found 504.0998. Example 12 2-[3-Chloro-4-methanesuIfonyl-phenyl]-3-cyclopentyI-N-thiazol-2-yl-propionamide
Figure imgf000064_0001
A solution of anhydrous aluminum chlonde (5 00 g, 37.50 mmol) in chloroform (15 mL) was cooled to 0°C and stirred for 30 mm under a nitrogen atmosphere. A solution of ethyl oxalyl chloπde (3 91 g, 28 64 mmol) in chloroform (5 mL) was then added, and the resulting reaction mixture was stiπed at 0°C for an additional 30 mm. A solution of 2- chlorothioanisole (4.08 g, 25.58 mmol) in chloroform (20 mL) was then slowly added to the cooled reaction mixture. The solution became red m color and slowly became gum- like over a penod of 30 mm The resulting reaction mixture was then stiπed for an additional 3.5 h, and duπng this penod, the reaction mixture was allowed to warm to 25°C The reaction mixture was then quenched by the addition of water (25 mL) The aqueous layer was extracted with chloroform (3 x 25 mL) The combined organic layers were concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded (3-chloro-4-methylsulfanyl-phenyl)-oxo-acetιc acid ethyl ester (4.32 g, 65.3%) as a yellow oil.
A solution of (3-chloro-4-methylsulfanyl-phenyl)-oxo-acetιc acid ethyl ester (3.93 g, 15.19 mmol) in methanol (30 mL) was cooled to 0°C and then treated with sodium borohydnde (530.9 mg, 14.03 mmol). The reaction mixture changed from yellow to colorless The mixture was stiπed for 15 mm and then quenched with a IN aqueous hydrochlonc acid solution (10 mL). The resulting reaction mixture was then extracted with methylene chloπde (2 x 30 mL). The combined organic layers were washed with a saturated aqueous sodium chlonde solution (1 x 30 mL), dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 9/1 then 4/1 hexanes/ethyl acetate) afforded (3-chloro-4-methylsulfanyl-phenyl)- hydroxy-acetic acid ethyl ester (1.43 g, 38%) as a white solid: mp 56-57°C; EI-HRMS m/e calcd for CnHι3ClO3S (M+) 260.0273, found 260.0276.
A solution of (3-chloro-4-methylsulfanyl-phenyl)-hydroxy-acetιc acid ethyl ester (1.43 g, 5 49 mmol) in pyndme (2 mL) was treated with acetic anhydride (2 mL) and 4- dimethylammopyπdme (50 mg, 0.41 mmol) The reaction mixture was stirred at 25°C for 16 h The reaction mixture was then diluted with methylene chlonde (100 mL) The organic layer was washed with a IN aqueous hydrochlonc acid solution (2 x 30 mL), w ashed with a saturated aqueous sodium chloπde solution (1 x 30 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded acetoxy-(3-chloro-4- methylsulfanyl-phenyl)-acetιc acid ethyl ester (1.51 g, 91%) as a light yellow oil: EI- HRMS m/e calcd for C13HI5ClO4S (M +) 302.0379, found 302.0387.
A solution of acetoxy-(3-chloro-4-methylsulfanyl-phenyl)-acetιc acid ethyl ester (1 47 g, 4.87 mmol) in hexamethylphosphoramide (7.2 mL) and methanol (20 μL) was treated with a 0.1M solution of samanum iodide in tetrahydrofuran (146 mL, 14.6 mmol). The reaction mixture was stiπed at 25°C under nitrogen for 6 mm. Duπng this time penod, the reaction mixture changed from purple to white. The reaction mixture was diluted with water (150 mL) and then extracted with methylene chlonde (3 x 100 mL). The combined organic layers were dπed over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded (3-chloro-4-methylsulfanyl-phenyl)-acetιc acid ethyl ester (0.71 g, 60%) as a light yellow oil: EI-HRMS m/e calcd for CnH13ClO2S (M+) 244.0324, found 244 0332 A solution of diisopropylamine (457 μL, 3.26 mmol) in tetrahydrofuran (5 mL) was cooled to -78°C under a nitrogen atmosphere and then treated with a 2.5M solution of n- butylhthium in hexanes (1.3 mL, 3.26 mmol). The mixture was stiπed at -78°C for 30 mm, at which time, a solution of (3-chloro-4-methylsulfanyl-phenyl)-acetιc acid ethyl ester (0.67 g, 2.75 mmol) m tetrahydrofuran (8 mL) was slowly added to the reaction mixture. The reaction mixture turned deep yellow in color The reaction mixture was then further stirred at -78°C for 30 mm, at which time, a solution of lodomethylcyclopentane (0.65 g, 3.09 mmol) in l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)- pynmidone (1 mL) was added via syπnge. The reaction mixture was then allowed to warm to 25°C, where it was stirred for 16 h The reaction mixture turned red in color duπng this time penod The reaction mixture was quenched with a 6N aqueous hydrochlonc acid solution (5 mL) and further diluted with water (20 mL). The reaction mixture was then extracted with methylene chlonde (3 x 20 mL). The combined organic layers were washed with a saturated aqueous sodium chlonde solution (1 x 25 mL), dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(3-chloro-4- methylsulfanyl-phenyl)-3-cyclopentyl-propιonιc acid ethyl ester (0.50 g, 56%) as a light yellow oil
A solution of 2-(3-chloro-4-methylsulfanyl-phenyl)-3-cyclopentyl-propιonιc acid ethyl ester (0.45 g, 1.39 mmol) in ethanol (3 mL) was treated with a 10% aqueous potassium hydroxide solution (2 mL). The reaction mixture was stiπed under nitrogen at 25 °C for 16 h. The reaction mixture was then acidified with a IN aqueous hydrochlonc acid solution (5 mL). The reaction mixture was then extracted with methylene chlonde (3 x 15 mL) The combined organic layers were dπed over sodium sulfate, filtered, and concentrated in vacuo to afford 2-(3-chloro-4-methylsulfanyl-phenyl)-3-cyclopentyl- propiomc acid (0.29 g, 70%) as a white solid: EI-HRMS m/e calcd for C15H19ClO2S (NT) 298.0794, found 298 0798. A solution of benzotriazol-l-yloxytris(dimethylamino)phosphonium hexafluorophosphate (0.62 g, 1.41 mmol) and 2-(3-chloro-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid (0.29 g, 0.95 mmol) in methylene chloride (10 mL) was treated with N,N- diisopropylethylamine (500 μL, 2.87 mmol) and 2-aminothiazole (140 mg, 1.27mmol). The mixture was stiπed under nitrogen at 25°C for 14 h. The reaction mixture was then washed with a 6Ν aqueous hydrochloric acid solution (1 x 15 mL) and washed with a saturated aqueous sodium chloride solution (1 x 25 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(3-chloro-4- methylsulfanyl-phenyl)-3-cyclopentyl-N-thiazol-2-yl-propionamide (0.26 g, 71%) as a white solid: EI-HRMS m/e calcd for Cι8H2ιClN2OS2 (M+) 380.0783, found 380.0792.
A solution of 2-(3-chloro-4-methylsulfanyl-phenyl)-3-cyclopentyl-N-thiazol-2-yl- propionamide (187 mg, 0.49 mmol) in methylene chloride (10 mL) was cooled to 0°C under nitrogen and then treated with 3-chloroperoxybenzoic acid (456. 8 mg based on 50% purity). The reaction mixture was stiπed for 3 h, and during this period, the temperature was allowed to warm to 25°C. The reaction mixture was then diluted with methylene chloride (50 mL). The organic layer was washed with a saturated aqueous sodium carbonate solution (1 x 20 mL), washed with a saturated aqueous sodium chloride solution (1 x 20 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thiazol-2-yl-propionamide (102 mg, 50%) as a white solid: EI-HRMS m/e calcd for C18H2ιClN2O3S2 (M+) 412.0682, found 412.0674. Example 13 (2R)-3-Cyclopentyl-2-(4-methanesuIfonylphenyl)-N-thiazol-2-yl-propionamide
Figure imgf000068_0001
A solution of ^-( ethanesulfonyl)phenyl acetic acid (43 63 g, 0.204 mol) in methanol (509 mL) was treated slowly with concentrated sulfunc acid (2 mL) The resulting reaction mixture was heated under reflux for 19 h The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol The residue was diluted with ethyl acetate (800 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 200 mL), washed with a saturated aqueous sodium chlonde solution (1 x 200 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 1/1 hexanes/ethyl acetate) afforded 4-(methanesulfonyl)phenyl acetic acid methyl ester (45.42 g, 98%) as a yellow oil which solidified to a cream colored solid upon sitting over time at 25°C mp 78-80°C, EI-HRMS m/e calcd for Cι0H12O4S (M+) 228 0456, found 228 0451.
A mechanical stiπer was used for this reaction A solution of dnsopropylamme (29.2 mL, 0.21 mol) in dry tetrahydrofuran (186 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro- 2(lH)-pyπmιdιnone (62 mL) was cooled to -78°C and then treated with a 2.5M solution of n-butylhthium in hexanes (83 4 mL, 0.21 mol) The yellow-orange reaction mixture was stiπed at -78°C for 35 min and then slowly treated with a solution of 4- (methanesulfonyl)phenyl acetic acid methyl ester (45.35 g, 0.20 mol) in dry tetrahydrofuran (186 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pyπmιdmone (62 mL) The reaction mixture turned dark in color. The reaction mixture was then stiπed at -78°C for 50 mm, at which time, a solution of lodomethylcyclopentane (50.08 g, 0.24 mol) in a small amount of dry tetrahydrofuran was added slowly. The reaction mixture was then stiπed at -78°C for 50 mm, and then allowed to warm to 25°C, where it was stirred for 36 h. The reaction mixture was quenched with water (100 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran The remaining residue was diluted with ethyl acetate (1.5 L). The organic phase was washed with a saturated aqueous sodium chloπde solution (1 x 500 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonylphenyl)propιonιc acid methyl ester (41.79 g, 68%) as a yellow viscous oil EI-HRMS m/e calcd for Cι6H22O4S (M+) 310.1239. found 310.1230.
A solution of 3-cyclopentyl-2-(4-methanesulfonylphenyl)propιonιc acid methyl ester (50 96 g, 0.16 mol) in methanol (410 mL) was treated with a IN aqueous sodium hydroxide solution (345 mL, 0.35 mol). The reaction mixture was stirred at 25°C for 24 h. The reaction mixture was concentrated in vacuo to remove methanol. The resulting aqueous residue was acidified to pH = 2 with concentrated hydrochlonc acid and then extracted with ethyl acetate (5 x 200 mL) The combined organic layers were dned over sodium sulfate, filtered, and concentrated in vacuo to afford pure 3-cyclopentyl-2-(4- methanesulfonylphenyl)propιonιc acid (43 61 g, 90%) as a white solid which was used without further puπfication. mp 152-154°C, EI-HRMS m e calcd for C15H20O4S (M+) 296.1082, found 296.1080.
Two separate reactions were setup in parallel: (1) A solution of (R)-(+)-4-benzyl-2- oxazohdmone (3.67 g, 20.73 mmol) m dry tetrahydrofuran (35 mL) was cooled to -78°C and then treated with a 2.5M solution of n-butylhthium in hexanes (7.9 mL, 19.86 mmol). The resulting reaction mixture was stiπed at -78°C for 30 mm and then allowed to warm to 25°C, where it was stirred for 1.5 h (2) A solution of racemic 3-cyclopentyl-2-(4- methanesulfonylphenyl)propιonιc acid (5.12 g, 17.27 mmol) in dry tetrahydrofuran (35 mL) was cooled to 0°C and then treated with tnethylamme (2.8 mL, 19.86 mmol). The reaction mixture was stiπed at 0°C for 10 nun and then treated dropwise with tπmethylacetyl chlonde (2.6 mL, 20.73 mmol). The resulting reaction mixture was stiπed at 0°C for 2 h and then cooled to -78°C for the addition of the freshly prepared chiral oxazolidmone. The reaction mixture containing the oxazolidmone was then added to the cooled (-78°C) mixed anhydπde solution The resulting reaction mixture was stiπed as -78°C for 1 h and allowed to gradually warm to 25°C. The reaction mixture was then stiπed at 25°C for 3 d. The resulting reaction mixture was quenched with water (100 mL) and then concentrated in vacuo to remove tetrahydrofuran. The resulting aqueous residue was diluted with ethyl acetate (600 mL). The organic layer was washed with a saturated aqueous sodium chloπde solution (1 x 300 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo Thin layer chromatography using 13/7 hexanes/ethyl acetate as the developing solvent indicated the presence of two products The higher moving product had a Rf =0.32 and the lower moving product had a Rf = 0.19. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 9/1 then 13/7 hexanes/ethyl acetate) afforded two products: (1) The higher Rf product (4R, 2'S)-4-benzyl-3-[3- cyclopentyl-2-(4-methanesulfonylphenyl)propιonyl]-oxazohdm-2-one (2.12 g, 54%) as a white foam- mp 62-64°C; [c.]23 589 = +6.3° (c=0.24, chloroform); EI-HRMS m/e calcd for C25H29NO5S (M+) 455.1766, found 455.1757. (2) The lower Rf product (4R, 2R)-4- benzyl-3-[3-cyclopentyl-2-(4-methanesulfonylphenyl)propιonyl]-oxazolιdm-2-one (3.88 g, 99%) as a white foam: mp 59-61°C; [α]23 589 = -98.3° (c=0.35, chloroform); EI-HRMS m/e calcd for C25H29NO5S (M +) 455.1766, found 455.1753. The combined mass recovery from the two products was 6.00 g, providing a 76% conversion yield for the reaction
An aqueous solution of lithium hydroperoxide was freshly prepared from mixing a solution of anhydrous lithium hydroxide powder (707.3 mg, 16.86 mmol) m 5.27 mL of water with a 30% aqueous hydrogen peroxide solution (3.44 mL, 33.71 mmol). This freshly prepared aqueous lithium hydroperoxide solution was cooled to 0°C and then slowly added to a cooled (0°C) solution of (4R, 2'R)-4-benzyl-3-[3-cyclopentyl-2-(4- methanesulfonylphenyl)propιonyl]-oxazolιdm-2-one (3.84 g, 8.43 mmol) in tetrahydrofuran (33 mL) and water (11 mL). The reaction mixture was stiπed 0°C for 1.5 h The reaction mixture was then quenched with a 1.5N aqueous sodium sulfite solution (25 mL) The reaction mixture was further diluted with water (300 mL) The resulting aqueous layer was continuously extracted with diethyl ether until thm layer chromatography indicated the absence of the recovered chiral oxazolidmone in the aqueous layer The aqueous layer was then acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and extracted with ethyl acetate (300 mL) The organic extract was dned over sodium sulfate, filtered, and concentrated in vacuo to afford (2R)-3- cyclopentyl-2-(4-methanesulfonylphenyl)propιomc acid as a white solid (2.23 g, 89%) which was used without further puπfication Flash chromatography (Merck Silica gel 60, 70-230 mesh, 30/1 methylene chlonde/methanol then 10/1 methylene chlonde/methanol) was used to obtain a punfied sample for analytical data and afforded pure (2R)-3- cyclopentyl-2-(4-methanesulfonylphenyl)propιomc acid as a white foam- mp 62-64°C (foam to gel), [α]23 589 = -50.0° (c=0.02, chloroform), EI-HRMS m/e calcd for C15H20O4S (M+) 296 1082, found 296 1080
A solution of tnphenylphosphme (3.35 g, 12.79 mmol) m methylene chloπde (19 mL) was cooled to 0°C and then slowly treated with N-bromosuccmimide (2.28 g, 12.79 mmol) in small portions. The reaction mixture was stiπed at 0°C for 30 mm, and dunng this time penod, the color of the reaction mixture changed from light yellow to a darker yellow then to a purple color. The cooled purple reaction mixture was then treated with the (2R)-3-cyclopentyl-2-(4-methanesulfonylphenyl)propιonιc acid (2.23 g, 7.52 mmol) The resulting reaction mixture was then allowed to warm to 25°C over 45 mm, at which time, the reaction mixture was then treated with 2-amιnothιazole (1.88 g, 18.81 mmol) The resulting reaction mixture was stiπed at 25°C for 12 h. The reaction mixture was then concentrated in vacuo to remove methylene chloπde The remaining black residue was diluted with ethyl acetate (300 mL) and then washed well with a 10% aqueous hydrochlonc acid solution (2 x 100 mL), a 5% aqueous sodium bicarbonate solution (3 x 100 mL), and a saturated aqueous sodium chloride solution (1 x 200 mL). The organic layer was then dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1, 3/1, and then 11/9 hexanes/ethyl acetate) afforded (2R)-3-cyclopentyl-2-(4-methanesulfonylphenyl)-N-thiazol-2-yl- propionamide (2.10 g, 74%) as a white foam: mp 78-80°C (foam to gel); [α]23 589 = -70.4° (c=0.027, chloroform); EI-HRMS m/e calcd for C18H22N2O3S2 (M+) 378.1072, found 378.1081.
Example 14 3-Cyclopentyl-2-(4-methanesulfonyI-3-nitrophenyl)-N-thiazol-2-yl-propionamide
Figure imgf000072_0001
A solution of 4-chloro-3-nitrophenylacetamide (2.00 g, 9.32 mmol) in methanol (40 mL) was treated with Amberlyst® 15 ion exchange resin (15.00 g). The resulting reaction mixture was heated under reflux for 64 h. The reaction mixture was allowed to cool to 25 °C and then filtered to remove the Amberlyst® 15 ion exchange resin. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 4-chloro-3-nitrophenylacetic acid methyl ester (1.91 g, 89%) as a yellow oil: EI-HRMS m/e calcd for C9H8ClNO4 (M+) 229.0142, found 229.0146.
A solution of diisopropylamine (3.35 mL, 23.9 mmol) in dry tetrahydrofuran (45 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (15 mL) was cooled to -78°C and then treated dropwise with a 2.5M solution of n-butyllithium in hexanes (9.56 mL, 23.9 mmol) over a 10 min period. The pale yellow reaction mixture was stirred at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-nιtrophenylacetιc acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 min penod. The reaction mixture turned deep purple (almost black) m color. The reaction mixture was then stiπed at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21.8 mol) m a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was then stirred at -78°C and then allowed to warm to 25°C, where it was stiπed for 48 h. The reaction mixture was quenched with a saturated aqueous ammonium chlonde solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL). The organic phase was washed with a saturated aqueous sodium chloπde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(4-chloro-3-nιtrophenyl)-3-cyclopentyl- propionic acid methyl ester (2.17 g, 32%) as a yellow oil: EI-HRMS m/e calcd for C15H18ClNO4 (M+) 311.0924, found 311.0927.
A solution of 2-(4-chloro-3-nιtrophenyl)-3-cyclopentyl-propιonιc acid methyl ester (1.00 g, 3.21 mmol) and sodium methanesulfinate (0.36 g, 3.53 mmol) in dimethyl sulfoxide (3 mL) was heated at 130°C for 5 h. The black reaction mixture was then poured over ice (20 g), resulting in the formation of a brown sticky substance. The resulting mixture was then treated with ethyl acetate (50 mL) and water (50 mL), and the layers were separated. The aqueous layer was further extracted with ethyl acetate (2 x 50 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-mtrophenyl)-propιonιc acid methyl ester (0.95 g, 84%) as a yellow gel: FAB-HRMS m/e calcd for C16H2ιNO6S (M+H)+ 356.1169, found 356.1175. A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-nιtrophenyl)-propιonιc acid methyl ester (865 mg, 2 43 mmol) in tetrahydrofuran (6 mL) was treated with a 0.8M aqueous lithium hydroxide solution (4 6 mL, 3.65 mmol) The reaction mixture was stiπed at 25°C for 3 h The reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The resulting aqueous residue was diluted with water (25 mL) and then treated with a IN aqueous hydrochlonc acid solution (10 mL). The resulting aqueous layer was then extracted with ethyl acetate (2 x 50 mL). The combined organic layers were dπed over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/4 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nιtrophenyl)-propιomc acid (723 mg, 87%) as a white foam Analytical data indicated the presence of a small impuπty; however, the 3-cyclopentyl-2- (4-methanesulfonyl-3-nιtrophenyl)-propιonιc acid was used without further punfication in subsequent reactions
A solution of tnphenylphosphme (138 mg, 0.53 mmol) methylene chlonde (2 mL) was cooled to 0°C and then slowly treated with N-bromosuccmimide (94 mg, 0.53 mmol) m small portions The reaction mixture was stiπed at 0°C for 10 m and then treated with 3-cyclopentyl-2-(4-methanesulfonyl-3-nιtrophenyl)-propιonιc acid (150 mg, 0.44 mmol) The resulting reaction mixture was stiπed at 0°C for 5 mm and then allowed to warm to 25°C, where it was stirred for 25 mm. The reaction mixture was then treated with 2- aminothiazole (97 mg, 0.97 mmol) The resulting reaction mixture was stiπed at 25°C for 15 h The crude reaction mixture was directly punfied by flash chromatography, (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate), to afford 3-cyclopentyl-2- (4-methanesulfonyl-3-nιtrophenyl)-Ν-thιazol-2-yl-propιonamιde (96 mg, 52%) as a pale yellow solid, mp 121-124°C; FAB-HRMS m/e calcd for Cι8H2iN3O5S2 (M+H)+ 424.1001, found 424.1000. Example 15
3-CyclopentyI-2-(3,4-dichlorophenyl)-N-(5-hydroxymethyl-thiazoI-2-yl)- propionamide
Figure imgf000075_0001
A solution of 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thιazole-5- carboxyhc acid ethyl ester (prepared in Example 1 (B)(g), 110 mg, 0.25 mmol) in diethyl ether (2 mL) at 0°C was slowly treated with lithium aluminum hydπde (12 mg, 0.31 mmol) The resulting reaction mixture continued to stir at 0°C and was allowed to gradually warm to 25°C The reaction mixture was then stiπed at 25°C over a penod of 14 h The reaction mixture was slowly quenched by the dropwise addition of water (5 mL). The resulting reaction mixture was partitioned between water and ethyl acetate. A saturated aqueous sodium chlonde solution was added to break up the emulsions. The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(5-hydroxymethyl-thιazol-2-yl)- propionamide (52 9 mg, 53%) as a light yellow solid mp 128-130°C, EI-HRMS m/e calcd for Cι8H2oCl2N2O2S (jVT) 398.0623, found 398.0623.
Example 16
3-Cyclopentyl-2-(3,4-dichlorophenyl)-N-[4-(2-hydroxyethyl)-thiazoI-2-yl]- propionamide
Figure imgf000076_0001
A solution of { 2-[3-cyclopentyl-2-(3,4-dichlorophenyl)-propionylamino]-thiazol-4-yl}- acetic acid ethyl ester (prepared in Example 1 (B)(c), 129 mg, 0.28 mmol) in tetrahydrofuran (1.4 mL) at 25°C was slowly treated with sodium borohydride (22.5 mg, 0.59 mmol). The resulting reaction mixture was stiπed at 25°C for 10 h. After 10 h at 25°C, a substantial amount of starting material still remained. An additional amount of sodium borohydride powder (21.4 mg, 0.57 mmol) was added to the reaction mixture, and the reaction mixture was heated under reflux for 14 h. The reaction mixture was allowed to cool to 25°C, and then slowly quenched by the dropwise addition of water. The resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The resulting residue was diluted with ethyl acetate (100 mL) and washed with a saturated aqueous sodium chloride solution (1 x 50 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 then 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4- dichlorophenyl)-N-[4-(2-hydroxyethyl)-thiazol-2-yl]-propionamide (68.1 mg, 58%) as a white foam: mp 85-86°C; FAB-HRMS m/e calcd for C19H22Cl2N2O2S (M+H)+ 413.0858, found 413.0838. Example 17
3-Cyclopentyl-2-(3,4-dichlorophenyI)-N-(4-hydroxymethyl-thiazoI-2-yl)- propionamide
Figure imgf000077_0001
A solution of 2-[3-cyclopentyl-2-(3,4-dichlorophenyl)-propionylamino]-thiazole-4- carboxylic acid ethyl ester (prepared in Example l(B)(f), 200 mg, 0.45 mmol) in tetrahydrofuran (3 mL) at 25°C was slowly treated with sodium borohydride (26.0 mg, 0.68 mmol). The reaction mixture was heated under reflux for 48 h. The reaction mixture was allowed to cool to 25°C and then slowly quenched by the dropwise addition of water. The resulting reaction mixture was partitioned between water and ethyl acetate. The organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dichlorophenyl)-N-(4-hydroxymethyl-thiazol-2-yl)- propionamide (44.9 mg, 25%) as a white solid: mp 88-90°C; EI-HRMS m/e calcd for Ci8H2oCl2N2O2S (M+) 398.0623, found 398.0631.
Example 18 {2-[3-CyclopentyI-2-(3,4-dichlorophenyI)-propionylamino]-thiazol-4-yl}-acetic acid
Figure imgf000077_0002
A solution of { 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thιazol-4-yl}- acetic acid ethyl ester (prepared in Example l(B)(c), 198.1 mg, 0.44 mmol) m absolute ethanol (2.2 mL) was treated with a IN aqueous sodium hydroxide solution (910 μL, 0.91 mmol) The reaction mixture was heated under reflux for 2 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove absolute ethanol. The resulting residue was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and extracted with ethyl acetate (1 x 150 mL). The organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo The resulting white residue was washed well with cold water and dned to afford {2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylamιno]- thιazol-4-yl } -acetic acid (150 mg, 81%) as a white solid: mp 100-102°C; FAB-HRMS m/e calcd for C^oC ^OsS (M+H)+ 427.0650, found 427.0633
Example 19 2-[3-Cyclopentyl-2-(3,4-dichlorophenyl)-propionylamino]-thiazole-5-carboxylic acid
Figure imgf000078_0001
A solution of 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylarmno]-thιazole-5- carboxyhc acid ethyl ester (prepared in Example l(B)(g), 1.0 g, 2.27 mmol) in absolute ethanol (10 mL) was treated with a IN aqueous sodium hydroxide solution (4.77 mL, 4.77 mmol). The reaction mixture was heated under reflux for 15 h. The reaction mixture was allowed to cool to 25 °C and then concentrated in vacuo to remove absolute ethanol The resulting yellow residue was acidified to pH = 2 with concentrated hydrochlonc acid and extracted with ethyl acetate (2 x 75 mL). The combined organic layers were dned over magnesium sulfate, filtered, and concentrated in vacuo. Recrystalhzation from ethyl acetate afforded 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)- propιonylammo]-thιazole-5-carboxyhc acid (210 mg, 22%) as a white solid: mp 269- 270°C, FAB-HRMS m/e calcd for C18H18Cl2N2O3S (M+H)+ 413.0493, found 413.0483.
Example 20 2- [3-Cyclopentyl-2-(3,4-dichlorophenyl)-propionylamino]-thiazole-4-carboxylic acid
Figure imgf000079_0001
A solution of 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thιazole-4- carboxylic acid ethyl ester (prepared in Example l(B)(f), 600 mg, 1.36 mmol) in absolute ethanol (6 mL) was treated with a IN aqueous sodium hydroxide solution (2.85 mL, 2.85 mmol) The reaction mixture was heated under reflux for 15 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove absolute ethanol. The resulting yellow residue was acidified to pH = 2 with concentrated hydrochlonc acid and extracted with ethyl acetate (2 x 100 mL). The combined organic layers were dned over magnesium sulfate, filtered, and concentrated in vacuo. Precipitation from 1/1 hexanes/ethyl acetate afforded 2-[3-cyclopentyl-2-(3.4-dιchlorophenyl)-propιonylammo]- thιazole-4-carboxyhc acid (399 mg, 71%) as a white solid: mp 285-287°C; FAB-HRMS m/e calcd for C18Hι8Cl2N2O3S (M+H)+ 413 0493, found 413.0481
Example 21
(A) {2-[3-Cyclopentyl-2-(3,4-dichlorophenyl)-propionylamino]-thiazol-4-yl}-acetic acid methyl ester
Figure imgf000080_0001
A solution of {2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylamιno]-thιazol-4-yl}- acetic acid (prepared in Example 18, 95 4 mg, 0.223 mmol) in methanol (1.1 mL) was treated with 1 drop of concentrated sulfuπc acid The reaction mixture was heated under reflux for 15 h The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol The resulting residue was diluted with ethyl acetate (100 mL) The organic phase was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded { 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thιazol-4-yl }-acetιc acid methyl ester (77.2 mg, 78%) as a yellow viscous oil FAB-HRMS m/e calcd for C2oH22Cl2N2O3S (M+H)+ 441.0807, found 441 0804
(B) In an analogous manner, there were obtained:
(a) From 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thιazole-4-carboxylιc acid (prepared in Example 20) 2-[3-Cyclopentyl-2-(3,4-dιchlorophenyl)- propιonylammo]-thιazole-4-carboxylιc acid methyl ester as a white solid: mp 153-155°C; FAB-HRMS m/e calcd for Cι9H2oCl2N2O3S (M+H)+ 427 0650, found 427.0659
(b) From 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thιazole-5-carboxylιc acid (prepared in Example 19) 2-[3-Cyclopentyl-2-(3,4-dιchlorophenyl)- propιonylamιno]-thιazole-5-carboxyhc acid methyl ester as a white solid: mp 150-151°C, FAB-HRMS m/e calcd for C19H20C12N2O3S (M+H)+ 427.0650, found 427.0650.
Example 22 (A) 3-Cyclopentyl-2-(4-nitro-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000081_0001
A solution of freshly prepared lithium dusopropylamide (430.55 mL of a 0.3M stock solution, 129.16 mmol) cooled to -78°C was treated with (4-nιtro-phenyl)-acetιc acid ethyl ester (26.32 g, 125.83 mmol) in tetrahydrofuran hexamethylphosphoramide (312.5 mL, 3 1) The resulting solution was stiπed at -78°C for 45 mm. lodomethylcyclopentane (27.75 g, 132 1 mmol) was then added m hexamethylphosphoramide (27.75 mL) The mixture was stiπed at -78°C for 4 h The reaction was then warmed to 25°C and was stiπed at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chlonde solution (250 mL) This mixture was concentrated, diluted with water (250 mL), and extracted with ethyl acetate (3 x 300 mL) The organics were washed with a saturated aqueous lithium chlonde solution (2 x 250 mL), dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 98/2 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-nιtro-phenyl)-propιonιc acid ethyl ester (28.30 g, 77.2%) as a yellow oil: EI-HRMS m/e calcd for C16H2ιNO4 (M+) 291.1470, found 291.1470.
A solution of 3-cyclopentyl-2-(4-nιtro-phenyl)-propιonιc acid ethyl ester (14.1 g, 48.06 mmol) in tetrahydrofuran/water (300 mL, 3:1) was treated with lithium hydroxide (4.35 g, 103.67 mmol). The reaction was stiπed at 25°C for 21 h. The tetrahydrofuran was then removed in vacuo The residue was diluted with water (75 mL) and extracted with ether (3 x 75 mL) The aqueous layer was acidified to pH = 1 with a 3N aqueous hydrochlonc acid solution The product was extracted into methylene chlonde (3 x 75 mL), washed with a saturated aqueous sodium chloπde solution (2 x 100 mL), dned over magnesium sulfate, filtered, and concentrated in vacuo to give 3-cyclopentyl-2-(4-nιtro-phenyl)- propiomc acid (11 97 g, 93.6%) as a yellow solid mp 119-125°C; EI-HRMS m/e calcd for Cι4H17NO4 (M+) 263.1157, found 263.1162
A solution of 3-cyclopentyl-2-(4-mtro-phenyl)-propιonιc acid (131 mg, 0.5 mmol) m methylene chloπde (5.0 mL) was cooled to 0°C and then treated with a 2.0M solution of oxalyl chloπde in methylene chloπde (1.0 mL, 2.0 mmol) and a few drops of NN- dimethylformamide The reaction mixture was stiπed at 0°C for 15 m and at 25°C for 30 min The reaction mixture was then treated with a solution of 2-amιnothιazole (110 mg, 1 0 mmol) in tetrahydrofuran (5 mL) and N,N-dπsopropylethylamme (0.28 mL, 0.55 mmol) The solution was stiπed at 25°C for 24 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclopentyl-2~(4-nιtro-phenyl)-Ν-thιazol-2-yl- propionamide (38 mg, 22.4%) as a yellow solid: mp 186-187°C; EI-HRMS m/e calcd for Cι7H,9N3O3S (M+) 345.1147, found 345.1148
(B) In an analogous manner, there was obtained.
(a) From ethyl 2-ammo-4-thιazole glyoxylate and 3-cyclopentyl-2-(4-nιtro-phenyl)- propiomc acid: { 2-[3-Cyclopentyl-2-(4-nιtro-phenyl)-propιonylammo]-thιazol-4-yl }-oxo- acetic acid ethyl ester (57.5%) as a white solid: mp 134-136°C; FAB-HRMS m/e calcd for C2iH23N3O6S (M+H)+ 446.1400, found 446.1386 Example 23
{2-[3-Cyclopentyl-2-(4-nitro-phenyl)-propionylamino]-thiazol-4-yI}-acetic acid ethyl ester
Figure imgf000083_0001
A solution of 3-cyclopentyl-2-(4-mtro-phenyl)-propιonιc acid (prepared in Example 22A, 263.0 mg, 1.0 mmol) in N,N-dιmethylformamide (10 mL) was treated with O- benzotπazol-l-yl-N,N,N',N'-tetramethyluromum hexafluorophosphate (379 mg, 1.0 mmol), (2-ammo-thιazol-4-yl)-acetιc acid ethyl ester (279 mg, 1.5 mmol) and N,N- dnsopropylethylamme (0.34 mL, 2.0 mmol). The reaction mixture was stirred at 25°C for 5 h. The reaction mixture was then poured into a 2Ν aqueous hydrochlonc acid solution (25 mL) and extracted with ethyl acetate (3 x 25 mL). The organic layers were combined and washed with water (1 x 75 mL), a saturated aqueous sodium bicarbonate solution (1 x 75 mL), a saturated aqueous sodium chloride solution (3 x 75 mL), dned over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded {2-[3-cyclopentyl-2-(4-mtro- phenyl)-propιonylammo]-thιazol-4-yl}-acetιc acid ethyl ester (70.0 mg, 39.4%) as a pale yellow oil: FAB-HRMS m/e calcd for C2iH25N3O5S (M+H)+ 432.1593, found 432.1595.
Example 24
{2-[3-Cyclopentyl-2-(4-nitro-phenyl)-propionylamino]-thiazol-4-yl}-acetic acid methyl ester
Figure imgf000084_0001
A solution of {2-[3-cyclopentyl-2-(4-mtro-phenyl)-propιonylamιno]-thιazol-4-yl}-acetιc acid ethyl ester (prepared in Example 23, 160 mg, 0.37 mmol) in methanol (10 mL) was treated with a catalytic amount of sulfunc acid The reaction mixture was refluxed for 68 h The reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded {2-[3-cyclopentyl-2-(4-nιtro- phenyl)-propιonylamιno]-thιazol-4-yl } -acetic acid methyl ester (82.3 mg, 53.3%) as a pale yellow oil: FAB-HRMS m/e calcd for C2oH23N3O5S (M+H)+ 418.1436, found 418 1424
Example 25
{2-[2-(4-Amino-phenyl)-3-cyclopentyl-propionylamino]-thiazol-4-yl}-acetic acid methyl ester
Figure imgf000084_0002
A solution of {2-[3-cyclopentyl-2-(4-nιtro-phenyl)-propιonylamιno]-thιazol-4-yl} -acetic acid methyl ester (prepared in Example 24, 75.3 mg, 0 18 mmol) in ethyl acetate (25 mL) was treated with 10% palladium on activated carbon The reaction mixture was stiπed under hydrogen gas at 60 psi at 25°C for 4 h. The catalyst was then filtered off through a pad of celite (ethyl acetate). The filtrate was concentrated in vacuo to give {2-[2-(4- amino-phenyl)-3-cyclopentyl-propionylamino]-thiazol-4-yl}-acetic acid methyl ester (64.5 mg, 93.3%) as a tan oil: EI-HRMS m/e calcd for C20H25N3O3S (M+) 387.1616, found 387.1612.
Example 26
2-[3-Cyclopentyl-2-(4-nitro-phenyI)-propionylamino]-thiazole-4-carboxylic acid methyl ester
Figure imgf000085_0001
A solution of 2-[3-cyclopentyl-2-(4-nitro-phenyl)-propionylamino]-thiazole-4-carboxylic acid ethyl ester (prepared in Example 39(B)(b), 135 mg, 0.32 mmol) in methanol (10 mL) was treated with a catalytic amount of sulfuric acid. The reaction mixture was refluxed for 68 h. The reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 2-[3-cyclopentyl-2-(4-nitro- phenyl)-propionylamino]-thiazole-4-carboxylic acid methyl ester (71.4 mg, 54.8%) as a pale yellow solid: EI-HRMS m/e calcd for d9H2iN3O5S (M+) 403.1201, found 403.1188.
Example 27
2-[2-(4-Amino-phenyl)-3-cyclopentyl-propionylamino]-thiazole-4-carboxyIic acid methyl ester
Figure imgf000086_0001
A solution of 2-[3-cyclopentyl-2-(4-nitro-phenyl)-propionylamino]-thiazole-4-carboxylic acid methyl ester (prepared in Example 26, 60.0 mg, 0.14 mmol) in ethyl acetate (25 mL) was treated with 10% palladium on activated carbon. The reaction mixture was stiπed under hydrogen gas at 60 psi at 25°C for 4.5 h. The catalyst was then filtered off through a pad of celite (ethyl acetate). The filtrate was concentrated in vacuo to give 2-[2-(4- amino-phenyl)-3-cyclopentyl-propionylamino]-thiazole-4-carboxylic acid methyl ester (61.3 mg, 100%) as a pale yellow oil: EI-HRMS m/e calcd for C19H23N3O3S (M +) 373.1460, found 373.1454.
Example 28
(A) {2-[2-(3-Chloro-phenyl)-3-cyclopentyl-propionylamino]-thiazol-4-yl}-acetic acid ethyl ester
Figure imgf000086_0002
A solution of freshly prepared lithium dusopropylamide (141.3 mL of a 0.32M stock solution, 45.0 mmol) cooled to -78°C was treated with (3-chloro-phenyl)-acetic acid (3.41 g, 20.0 mmol) in tetrahydrofuran/l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (49 7 mL, 3: 1) The resulting reaction solution was stiπed at -78°C for 1 h. lodomethylcyclopentane (4.64 g, 22.08 mmol) was then added in l,3-dιmethyl-3,4,5,6- tetrahydro-2(lH)-pynmιdmone (4.64 mL). The reaction mixture was stiπed at -78°C for 4 h The reaction was then warmed to 25°C and was stiπed at 25°C for 48 h. The solution was then quenched by the slow addition of the reaction mixture to a 2N aqueous hydrochlonc acid solution (50 mL) The product was extracted into ethyl acetate (1 x 150 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 85/15 hexanes/ethyl acetate) afforded 2-(3-chloro-phenyl)-3-cyclopentyl-propιomc acid (3.68 g, 72.9%) as a yellow solid mp 70-72°C, EI-HRMS m/e calcd for C14H17ClO2 (M+) 252.0917, found 252.0915
A solution of 2-(3-chloro-phenyl)-3-cyclopentyl-propιonιc acid (252 mg, 1.0 mmol) m methylene chlonde (10 mL) was cooled to 0°C and then treated with a 2.0M solution oxalyl chlonde in methylene chloπde (0.6 mL, 1.2 mmol) and a few drops of N,N- dimethylformamide The reaction mixture was stiπed at 0°C for 15 mm and at 25 °C for 2 h The reaction mixture was then treated with (2-amιno-thιazol-4-yl)-acetιc acid ethyl ester (409 mg, 2.2 mmol) and N,N-dnsopropylethylamme (0.5 mL, 2.4 mmol). This solution was stiπed at 25°C for 48 h At this time, the reaction was concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded {2-[2-(3-chloro-phenyl)-3-cyclopentyl-propιonylammo]-thιazol-4-yl}- acetic acid ethyl ester (254 mg, 60.3%) as a white solid: mp 121-125°C; EI-HRMS m/e calcd for C2ιH25ClΝ2O3S (M+) 420.1274, found 420.1268.
(B) In an analogous manner, there were obtained: (a) From 2-ammo-thιazole-4-carboxylιc acid ethyl ester and 2-(3-chloro-phenyl)-3- cyclopentyl-propionic acid: 2-[2-(3-Chloro-phenyl)-3-cyclopentyl-propιonylammo]- thιazole-4-carboxylιc acid ethyl ester as a white solid: mp 167-168°C; EI-HRMS m/e calcd for do^CH^S (M+) 406.1117, found 406.1103. (b) From 2-amino-pyridine and 2-(3-chloro-phenyl)-3-cyclopentyl-propionic acid: 2-(3- Chloro-phenyl)-3-cyclopentyl-N-pyridin-2-yl-propionamide as a clear oil: EI-HRMS m/e calcd for C19H2!ClN2O (M+) 328.1342, found 328.1333.
(c) From 6-amino-nicotinic acid methyl ester and 2-(3-chloro-phenyl)-3-cyclopentyl- propionic acid: 6-[2-(3-Chloro-phenyl)-3-cyclopentyl-propionylamino]-nicotinic acid methyl ester as a colorless oil: EI-HRMS m/e calcd for C2ιH23ClN2O3 (M+) 386.1397, found 386.1398.
Example 29 {2-[2-(3-Chloro-phenyl)-3-cyclopentyl-propionylamino]-thiazol-4-yI}-acetic acid methyl ester
Figure imgf000088_0001
A solution of {2-[2-(3-chloro-phenyl)-3-cyclopentyl-propionylamino]-thiazol-4-yl}-acetic acid ethyl ester (prepared in Example 28, 177.2 mg, 0.42 mmol) in methanol (15 mL) was treated with a catalytic amount of sulfuric acid. The reaction mixture was refluxed for 40 h. The reaction was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded {2-[2-(3-chloro-phenyl)-3- cyclopentyl-propionylamino]-thiazol-4-yl}-acetic acid methyl ester (104.4 mg, 60.9%) as a clear oil: EI-HRMS m/e calcd for C20H23C1N2O3S (M+) 406.1117, found 406.1118. Example 30
2- [2- (3- Chloro-phenyI)-3-cyclopentyl-propionylamino] -thiazoIe-4-carboxylic acid methyl ester
Figure imgf000089_0001
A solution of 2-[2-(3-chloro-phenyl)-3-cyclopentyl-propionylamino]-thiazole-4- carboxylic acid ethyl ester (prepared in Example 28(B)(a), 94.5 mg, 0.23 mmol) in methanol (15 mL) was treated with a catalytic amount of sulfuric acid. The reaction mixture was refluxed for 40 h. The reaction was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded 2-[2-(3-chloro-phenyl)-3-cyclopentyl-propionylamino]-thiazole-4-carboxylic acid methyl ester (36.8 mg, 40.3%) as a white solid: mp 95-98°C; EI-HRMS m/e calcd for C19H21ClN2O3S (M+) 392.0961, found 392.0989.
Example 31 (A) {2-[2-(4-Chloro-phenyl)-3-cyclopentyl-propionylamino]-thiazol-4-yl}-acetic acid ethyl ester
Figure imgf000089_0002
A solution of freshly prepared lithium dusopropylamide (78.0 mL of a 0.9 IM stock solution, 70.98 mmol) cooled to -78°C was treated with (4-chloro-phenyl)-acetic acid (5.76 g, 33.8 mmol) in tetrahydrofuran/l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)- pyπmidmone (84 mL, 3:1). The resulting solution was stiπed at -78°C for 1 h. lodomethylcyclopentane (7.45 g, 35.49 mmol) was then added in l,3-dιmethyl-3,4,5,6- tetrahydro-2(lH)-pynmιdmone (2 mL). This solution was stirred at -78°C for 4 h. The reaction was then warmed to 25°C and was stirred at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloπde solution (20 mL) The excess solvent was removed in vacuo The residue was acidified to pH = 1 with a IN aqueous hydrochlonc acid solution. The mixture was then poured into water (150 mL) and extracted with ethyl acetate (3 x 50 mL) The organics were dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 2-(4-chloro- phenyl)-3-cyclopentyl-propιonιc acid (6.76 g, 79.1%) as a yellow solid: mp 82-84°C. EI- HRMS m/e calcd for Cι4HI7ClO2 (M+) 252.0917, found 252.0906.
A solution of 2-(4-chloro-phenyl)-3-cyclopentyl-propιonιc acid (252 mg, 1.0 mmol) in methylene chlonde (10 mL) was cooled to 0°C and then treated with a 2.0M solution of oxalyl chloπde m methylene chloπde (0.55 mL, 1.1 mmol) and a few drops of N,N- dimethylformamide. The reaction mixture was stiπed at 0°C for 15 mm and then at 25°C for 1 5 h The reaction mixture was then treated with (2-ammo-thιazol-4-yl)-acetιc acid ethyl ester (409 mg, 2.2 mmol) and N,N-dnsopropylethylamine (0.5 mL, 2.4 mmol). This solution was stirred at 25°C for 24 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 85/15 hexanes/ethyl acetate) afforded {2-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-thιazol-4-yl}- acetic acid ethyl ester (183.3 mg, 43.5%) as a pale yellow oil: EI-HRMS m/e calcd for C2ιH25ClΝ2O3S (M+) 420.1274, found 420.1272.
(B) In an analogous manner, there were obtained:
(a) From 2-ammo-thiazole-4-carboxylic acid ethyl ester and 2-(4-chloro-phenyl)-3- cyclopentyl-propiomc acid- 2-[2-(4-Chloro-phenyl)-3-cyclopentyl-propιonylamιno]- thiazole-4-carboxylic acid ethyl ester as a white solid: mp 114-116°C; EI-HRMS m/e calcd for C20H23C1N2O3S (M+) 406.1117, found 406.1119.
(b) From 2-amino-pyridine and 2-(4-chloro-phenyl)-3-cyclopentyl-propionic acid: 2-(4- Chloro-phenyl)-3-cyclopentyl-N-pyridin-2-yl-propionamide as a clear oil: EI-HRMS m/e calcd for Cι9H2ιClN2O (M+) 328.1342, found 328.1355.
(c) From 6-amino-nicotinic acid methyl ester and 2-(4-chloro-phenyl)-3-cyclopentyl- propionic acid: 6-[2-(4-Chloro-phenyl)-3-cyclopentyl-propionylamino]-nicotinic acid methyl ester as a white foam: EI-HRMS m/e calcd for C2iH23ClN2O3 (M+) 386.1397, found 386.1384.
Example 32
2-[2-(4-Chloro-phenyl)-3-cyclopentyl-propionylamino]-thiazole-4-carboxylic acid methyl ester:
Figure imgf000091_0001
A solution of 2-[2-(4-chloro-phenyl)-3-cyclopentyl-propionylamino]-thiazole-4- carboxylic acid ethyl ester (prepared in Example 31(B)(a), 105 mg, 0.25 mmol) in methanol (10 mL) was treated with a catalytic amount of sulfuric acid. The reaction mixture was refluxed for 68 h. The reaction was concentrated in vacuo. High pressure liquid chromatography (Chromegasphere SI-60, 10 μm, 60 A, 25 cm X 23 cm ID, 75/25 heptane/ethyl acetate) afforded 2-[2-(4-chloro-phenyl)-3-cyclopentyl-propionylamino]- thiazole-4-carboxylic acid methyl ester (41.3 mg, 40.7%) as a white solid: mp 156- 157°C; EI-HRMS m/e calcd for C19H21ClN2O3S (M+) 392.0961, found 392.0956. Example 33
{2-[2-(4-Chloro-phenyl)-3-cyclopentyl-propionylamino]-thiazol-4-yl}-acetic acid methyl ester
Figure imgf000092_0001
A solution of {2-[2-(4-chloro-phenyl)-3-cyclopentyl-propionylamino]-thiazol-4-yl}-acetic acid ethyl ester (prepared in Example 31 A, 76.1 mg, 0.18 mmol) in methanol (5 mL) was treated with a catalytic amount of sulfuric acid. The reaction mixture was refluxed for 72 h. The reaction was concentrated in vacuo. High pressure liquid chromatography (Chromegasphere SI-60, 10 μM, 6θA, 25cm x 23cm ID, 75/25 heptane/ethyl acetate) afforded { 2-[3-cyclopentyl-2-(4-nitro-phenyl)-propionylamino]-thiazol-4-yl }-acetic acid methyl ester (21.5 mg, 29.2%) as a colorless oil: EI-HRMS m/e calcd for C20H23C1N2O3S (M+) 406.1117, found 406.1114.
Example 34 2-(4-Chloro-phenyl)-3-cyclopentyl-N-(5-hydroxymethyl-thiazol-2-yl)-propionamide
Figure imgf000092_0002
A solution of 2-[2-(4-chloro-phenyl)-3-cyclopentyl-propionylamino]-thiazole-4- carboxylic acid methyl ester (prepared in Example 32, 127.7 mg, 0.31 mmol) in tetrahydrofuran (0.4 mL) was added to a slurry of lithium aluminum hydride (15.0 mg, 0.39 mmol) in tetrahydrofuran (2.24 mL) at 0°C. The reaction mixture was stirred at 0°C for 2 h The reaction was then quenched by the dropwise addition of water. The reaction was then diluted with more water (25 mL) and extracted with ethyl acetate (3 x 25 mL) The organics were dπed over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded 2-(4-chloro-phenyl)-3-cyclopentyl-N-(5-hydroxymethyl-thιazol-2-yl)- propionamide (63 4 mg, 55.4%) as a white solid: mp 115-117°C; EI-HRMS m/e calcd for C,8H21ClN2O2S (M4-) 364 1012, found 364 1004
Example 35 3-Cyclopentyl-N-(4-hydroxymethyl-thiazoI-2-yl)-2-(4-methanesulfonyl-phenyl)- propionamide
Figure imgf000093_0001
A solution of 2-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propιonylammo]-thιazole- 4-carboxyhc acid ethyl ester (prepared in Example 3(B)(b), 130 mg, 0.29 mmol) in diethyl ether (2 mL) was cooled to 0°C and then slowly treated with lithium aluminum hydπde (17 mg, 0.44 mmol) The reaction mixture was allowed to warm to 25°C where it was stiπed for 4 h. After 4 h at 25°C, thin layer chromatography indicated the presence of starting matenal. An additional amount of lithium aluminum hydnde (11 mg, 0.29 mmol) was added to the reaction mixture, and the reaction mixture was allowed to stir at 25°C for 15 h. The reaction mixture was then slowly quenched by the dropwise addition of water. The resulting mixture was partitioned between water and ethyl acetate. The organic layer was dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, ethyl acetate) afforded 3- cyclopentyl-N-(4-hydroxymethyl-thιazol-2-yl)-2-(4-methanesulfonyl-phenyl)- propionamide (55 mg, 46%) as a white solid- mp 124-126°C, EI-HRMS m/e calcd for C,9H24N2O4S2 (M+) 408 11-78, found 408.1164
Example 36 3-CyclopentyI-N-[4-(2-hydroxyethyl)-thiazoI-2-yI]-2-(4-methanesulfonyl-phenyl)- propionamide
Figure imgf000094_0001
A solution of {2-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propionylammo]-thiazol- 4-yl }-acetιc acid ethyl ester (prepared in Example 3(B)(d), 120 mg, 0.26 mmol) in diethyl ether (500 μL) was cooled to 0°C and then slowly treated with lithium aluminum hydnde (15 mg, 0 39 mmol) The reaction mixture was allowed to warm to 25°C where it was stiπed for 1 h After 1 h at 25°C, thm layer chromatography still indicated the presence of the { 2-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propιonylamιno]-thιazol-4-yl }- acetic acid ethyl ester. An additional amount of lithium aluminum hydnde (10 mg, 0.26 mmol) was added to the reaction mixture, and the reaction mixture was allowed to stir at 25°C for 1 h The reaction mixture was then slowly quenched by the dropwise addition of water (10 mL) The resulting mixture was partitioned between water and ethyl acetate The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-N-[4-(2-hydroxyethyl)-thιazol-2-yl]-2-(4-methanesulfonyl- phenyl)-propιonamιde (20 mg, 18%) as a yellow foam: mp 84-87°C, EI-HRMS m/e calcd for C2oH26N2O4S2 (M+) 422.1334. found 422.1335. Example 37
(2R)-2-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionylamino]-thiazole-4- carboxylic acid methyl ester
Figure imgf000095_0001
A solution tnphenylphosphme (164 mg, 0.63 mmol) m methylene chlonde (3 mL) was cooled to 0°C and then treated with N-bromosuccmimide (112 mg, 0.63 mmol) in small portions. The resulting orange reaction mixture was stiπed at 0°C for 20 mm and then treated with (2R)-3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιomc acid (prepared in Example 54, 150 mg, 0.52 mmol). The reaction mixture was stiπed at 0°C for an additional 15 mm and then allowed to warm to 25°C. The reaction mixture was then treated with 2-amιnothιazole-4-carboxylιc acid methyl ester (181 mg, 1.15 mmol). The resulting reaction mixture was stirred at 25°C for 15 h. The crude reaction mixture was directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) to afford impure (2R)-2-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)- propιonylammo]-thιazole-4-carboxyhc acid methyl ester The impure product was diluted with ethyl acetate and then washed with a saturated aqueous sodium bicarbonate solution. The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo to provide pure (2R)-2-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonylamιno]- thιazole-4-carboxylιc acid methyl ester (92 mg, 41%) as a white solid: mp 143-144°C; [ ]23 589 = -10.2° (c=0.98, chloroform); EI-HRMS m/e calcd for C19H20C12Ν2O3S (M+) 426.0572, found 426.0562. Example 38 (A) 3-Cyclopentyl-2-(3,4-dichloro-phenyl)-N-pyridin-2-yl-propionamide:
Figure imgf000096_0001
A solution of tnphenylphosphme (28.80 g, 109.8 mmol) and imidazole (14.9 g, 219.6 mmol) in methylene chlonde (160 mL) was cooled to 0°C and then slowly treated with iodine (27 87 g, 109.8 mmol). The reaction mixture was then treated dropwise with a solution of cyclopentylmethanol (10.0 g, 99.8 mmol) m methylene chlonde (10 mL). The resulting reaction mixture was allowed to warm to 25°C, where it was stirred for 4 h. The reaction mixture was then diluted with water (50 mL), and the reaction mixture was further extracted with methylene chloπde (3 x 20 mL) The combined organic layers were dned over sodium sulfate, filtered and concentrated in vacuo at 25°C. The resulting solid was washed with pentane (4 x 50 mL) and filtered through a silica gel plug. The filtrate was concentrated in vacuo at 25°C to afford lodomethylcyclopentane (18.48 g, 88%) as a clear colorless liquid: EI-HRMS m/e calcd for C6HnIι (M+) 209.9906, found 209.9911
A solution of dπsopropylamme (13.36 mL, 101.89 mmol) in tetrahydrofuran (250 mL) was cooled to -78°C under a nitrogen atmosphere and then treated with a 2.0M solution of n-butylhthium in hexanes (51 mL, 101.89 mmol). The reaction mixture was stirred at - 78°C for 15 mm, at which time, a solution of 3,4-dichlorophenyl acetic acid (9.08 g, 44.3 mmol) in tetrahydrofuran (60 mL) and hexamethylphosphoramide (20 mL) was slowly added via a cannula. The bnght yellow solution was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (11.17 g, 53.2 mmol) in hexamethylphosphoramide (10 mL) was added via a cannula. The reaction mixture was stiπed at -78°C for 1 h. The reaction mixture was then allowed to warm to 25°C, where it was stiπed for 14 h The reaction mixture was then acidified to pH = 2 by the dropwise addition of a IN aqueous hydrochlonc acid solution and extracted with ethyl acetate (3 x 50 mL) The combined organic layers were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, chloroform then 99/1 chloroform/methanol) afforded 3-cyclopentyl-2-(3,4- dιchlorophenyl)-propιonιc acid (10.28 g, 81%) as a white solid: mp 74.5-76.9°C; EI- HRMS m/e calcd for C14H]6Cl2O2 (M+) 286.0527, found 286.0534
A solution of 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid (114 mg, 0.39 mmol) in methylene chloπde (10 mL) was treated with 1 drop of N,N-dιmethylformamide and then cooled to 0°C. The reaction mixture was then treated with a 2.0M solution of oxalyl chloπde in methylene chloπde (0.22 mL, 0.44 mmol). The reaction mixture was stiπed at 0°C for 30 mm and then treated with a solution of 2-ammopyndιne (78 mg, 0.83 mmol) and N,N-dιιsopropylethylamιne (0.16 mL, 0.95 mmol) in tetrahydrofuran (2 mL). The resulting reaction mixture was stiπed at 25°C for 14 h. The reaction mixture was then diluted with water (10 mL) and extracted with methylene chlonde (2 x 15 mL). The combined organic layers were dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, hexanes then 19/1 to 4/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-Ν-pyridιn-2-yl- propionamide (58 mg, 50%) as a white foam: EI-HRMS m/e calcd for Cι9H2oCl2N2O (M+) 362.0953, found 362.0955.
(B) In an analogous manner, there were obtained: (a) From 2-amιno-5-nιtropyπdme and 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid. 3-Cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(5-nιtropyπdιn)-2-yl-propιonamide as a yellow-orange foam: EI-HRMS m/e calcd for C19Hι9Cl2N3O3 (M+) 407.0803, found 407.0799. (b) From 2-ammo-5-carboxymethylpyndme and 3-cyclopentyl-2-(3,4-dιchlorophenyl)- propiomc acid- 3-Cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(5-carboxymethylpyπdm)-2-yl- propionamide as a white foam. EI-HRMS m/e calcd for C2ιH22Cl2N2O3 (M+) 420.1007, found 420.0994. (c) From 4-amιnopynmιdme and 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιomc acid: 3- Cyclopentyl-2-(3,4-dιchloro-phenyl)-N-pynmιdιne-6-yl-propιonamide as a white foam: EI-HRMS m/e calcd for C,8H19Cl2N3O (M+) 363.0905, found 363.0910.
(d) From 2-amιno-5-methylpyndme and 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιomc acid: 3-Cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(5-methylpyπdm)-2-yl-propιonamιde as a white solid. EI-HRMS m/e calcd for C20H22C12N2O (M+) 376.1109, found 376.1119.
(e) From 2-ammo-4-methylpyndme and 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid: 3-Cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(4-methylpyπdm)-2-yl -propionamide as a white solid EI-HRMS m/e calcd for C oH22Cl2N2O (M+) 376.1109, found 376.1106
(f) From 2-ammo-6-methylpyndme and 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιomc acid: 3-Cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(6-methylpyπdιn)-2-yl -propionamide as a light yellow solid: EI-HRMS m/e calcd for C2oH22Cl2N2O (M+) 376.1109, found 376 1107
(g) From 2-amιno-5-chloropyπdme and 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid. 3-Cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(5-chloropyπdm)-2-yl-propιonamιde as a white foam: EI-HRMS m/e calcd for Cι9Hι9Cl3N2O (M+) 396.0563, found 396.0564.
(h) From 2-ammo-5-bromopyndιne and 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιomc acid: 3-Cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(5-bromopyπdm)-2-yl-propιonamιde as a white solid: EI-HRMS m/e calcd for C19H19BrCl2N2O (M+) 440.0058, found 440.0066. Example 39 (A) 3-Cyclopentyl-2-(4-nitro-phenyl)-N-pyridin-2-yl-propionamide
Figure imgf000099_0001
A solution of 3-cyclopentyl-2-(4-nιtro-phenyl)-propιonιc acid (prepared in Example 22, 263 mg, 1 0 mmol) in methylene chlonde (5 mL) was cooled to 0°C and then treated with a 2 0M solution of oxalyl chloπde m methylene chloπde (0.6 mL, 1.2 mmol) and a few drops of N,N-dιmethylformamιde. The reaction mixture was stiπed at 0°C for 15 mm and then at 25°C for 1 h The reaction mixture was then treated with a solution of 2- ammopyπdine (207 mg, 2.2 mmol) in tetrahydrofuran (5 mL) and NN- diisopropylethylamme (0.42 mL, 2.5 mmol). The reaction mixture was stiπed at 25°C for 24 h At this time, the reaction was concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl- 2-(4-nιtro-phenyl)-Ν-pyndιn-2-yl-propιonamιde (110.2 mg, 32.5%) as a white solid: mp 152-154°C; EI-HRMS m e calcd for C19H2ιN3O3 (M+) 339.1582, found 339.1581.
(B) In an analogous manner, there were obtained
(a) From 4-amιnopynmιdme and 3-cyclopentyl-2-(4-mtro-phenyl)-propιonιc acid: 3- Cyclopentyl-2-(4-nιtro-phenyl)-N-pynmιdm-4-yl -propionamide as a white solid: mp 152- 153°C, EI-HRMS m/e calcd for CI 8H20N4O3 (M+) 340.1535, found 340.1533 (b) From 2-ammo-thιazole-4-carboxyhc acid ethyl ester and 3-cyclopentyl-2-(4-mtro- phenyl)-propιonιc acid: 2-[3-Cyclopentyl-2-(4-nιtro-phenyl)-propιonylammo]-thιazole-4- carboxyhc acid ethyl ester as a pale yellow solid: mp 110-115°C; EI-HRMS m/e calcd for C2oH23N3O5S (M+) 417.1358, found 417.1346. Example 40 3-Cyclopentyl-2-(4-methylsulfanyl-phenyI)-N-pyridin-2-yl-propionamide
Figure imgf000100_0001
A solution of diisopropylamine (3.2 mL, 23.16 mmol) in dry tetrahydrofuran (10.3 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (3.4 mL) was cooled to -78°C under nitrogen and then treated with a 10M solution of n-butyllithium in hexanes (2.3 mL, 23.16 mmol). The resulting reaction mixture was stirred at -78°C for 30 min and then treated dropwise with a solution of 4-(methylthio)phenylacetic acid (2.01 g, 11.03 mmol) in dry tetrahydrofuran (10.3 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyrimidinone (3.4 mL). The reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (2.55 g, 12.13 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was stirred at - 78°C for 30 min and then allowed to warm to 25°C where it was stiπed for 24 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochloric acid solution and then extracted with ethyl acetate (1 x 200 mL). The organic layer was washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)propionic acid (1.01 g, 35%) as a cream solid: mp 91-93°C; EI-HRMS m/e calcd for C15H20O2S (M+) 264.1184, found 264.1177.
A solution of 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)propionic acid (200 mg, 0.76 mmol) and triphenylphosphine (198 mg, 0.76 mmol) in methylene chloride (2 mL) was cooled to 0°C and then treated with N-bromosuccmimide (150 mg, 0.84 mmol) in small portions After the complete addition of N-bromosuccmimide, the reaction mixture was allowed to warm to 25°C over 30 min. The orange reaction mixture was then treated with 2-amιnopyπdme (151 mg, 1.60 mmol), and the resulting reaction mixture was stiπed at 25 °C for 15 h The reaction mixture was then concentrated in vacuo to remove methylene chloπde The remaining residue was partitioned between water and ethyl acetate The organic layer was washed with a IN aqueous hydrochlonc acid solution, washed with a saturated aqueous sodium bicarbonate solution, dned over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-Ν-pyndιn- 2-yl-propionarmde (83 mg, 32%) as a white solid: mp 127-128°C, EI-HRMS m/e calcd for C20H24N2OS (M+) 340 1609, found 340.1611
Example 41 3-Cyclopentyl-N-pyridin-2-yl-2-(4-trifluoromethylsulfanyl-phenyl)-propionamide
Figure imgf000101_0001
A solution of dπsopropylamme (2.4 mL, 16.80 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pyπmιdmone (2.5 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butylhthium in hexanes (6.7 mL, 16.80 mmol). The resulting reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of 4-(tnfluoromethylthιo)phenylacetιc acid (1.89 g, 8 00 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)- pyπmidmone (2.5 mL). The reaction mixture was allowed to stir at -78°C for 55 m , at which time, a solution of lodomethylcyclopentane (1.85 g, 8.80 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stiπed for 41 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochloric acid solution and then extracted with ethyl acetate (1 x 300 mL). The organic layer was washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-trifluoromethylsulfanyl- phenyl)propionic acid (1.47 g, 58%) as a cream solid: mp 69-71°C; EI-HRMS m/e calcd for Ci5H17F3O2S (M+) 318.0901, found 318.0912.
A solution of 3-cyclopentyl-2-(4-trifluoromethylsulfanyl-phenyl)propionic acid (59.6 mg, 0.187 mmol) and triphenylphosphine (49.1 mg, 0.187 mmol) in methylene chloride (468 μL) was cooled to 0°C and then treated with N-bromosuccinimide (36.7 mg, 0.206 mmol) in small portions. After the complete addition of N-bromosuccinimide, the reaction mixture was allowed to warm to 25°C over 30 min. The orange reaction mixture was then treated with 2-aminopyridine (35.2 mg, 0.374 mmol). The resulting reaction mixture was stiπed at 25°C for 16 h. The reaction mixture was then concentrated in vacuo to remove methylene chloride. The remaining residue was diluted with ethyl acetate (50 mL). The organic layer was washed with a 10% aqueous hydrochloric acid solution (1 x 50 mL), washed with a saturated aqueous sodium bicarbonate solution (1 x 50 mL), washed with water (1 x 50 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-Ν-pyridin-2-yl-2-(4-trifluoromethylsulfanyl-phenyl)- propionamide (25.0 mg, 34%) as a cream solid: mp 101-102°C; EI-HRMS m/e calcd for C20H2ιF3N2OS (M+) 394.1327, found 394.1321. Example 42 3-Cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-pyridin-2-yl-propionamide
Figure imgf000103_0001
A solution of 2-ammopyπdme (95 mg, 1.01 mmol) in acetonitnle (2 mL) was treated with 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propιonιc acid (prepared m Example 3(A), 250 mg, 0.84 mmol), tnphenylphosphme (243 mg, 0 93 mmol), triethylamine (350 μL, 2 53 mmol), and carbon tetrachlonde (1 mL) The resulting reaction mixture was stirred at 25 °C for 15 h The cloudy reaction mixture was diluted with water and then extracted with methylene chloπde The organic layer was dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded impure 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)- N-pyndιn-2-yl-propιonamιde. Recrystalhzation from hexanes/methylene chlonde provided pure 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-pyπdιn-2-yl-propιonamιde (170 mg, 54%) as a white solid: mp 172-173°C; EI-HRMS m/e calcd for C2oH2 N2O3S (M+) 372.1508, found 372.1498.
Example 43
(A) 3-CyclopentyI-N-pyridin-2-yl-2-(4-trifluoromethanesulfonyl-phenyl)- propionamide
Figure imgf000104_0001
A solution of diisopropylamine (2.4 mL, 16 80 mmol) m dry tetrahydrofuran (7 5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdιnone (2.5 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of π-butyllithium in hexanes (6.7 mL, 16.80 mmol) The resulting reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of 4-(tπfluoromethylthιo)phenylacetιc acid (1.89 g, 8.00 mmol) in dry tetrahydrofuran (7.5 mL) and 1.3-dιmethyl-3,4,5,6-tetrahydro-2(lH)- pyπmidinone (2 5 mL) The reaction mixture was allowed to stir at -78°C for 55 mm, at which time, a solution of lodomethylcyclopentane (1.85 g, 8 80 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stirred for 41 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (1 x 300 mL) The organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl- phenyl)propιonιc acid (1.47 g, 58%) as a cream solid: mp 69-71°C; EI-HRMS m/e calcd for C15H,7F3O2S (M+) 318.0901, found 318.0912. A solution of 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl-phenyl)propιonιc acid (1.33 g, 4.18 mmol) in methanol (10 mL) was treated slowly with 4 drops of concentrated sulfuπc acid. The resulting reaction mixture was heated under reflux for 36 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The residue was diluted with ethyl acetate (200 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 100 mL), washed with a saturated aqueous sodium chloπde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 97/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tπfluoromethylsulfanyl- pheny propiomc acid methyl ester (1 37 g, 99%) as a light yellow oil. EI-HRMS m/e calcd for C16H19F3O2S (M+) 332.1058, found 332 1052
A solution of 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl-phenyl)propιonιc acid methyl ester (1 14 g, 3 43 mmol) in methylene chloπde (8.6 mL) was treated with 3- chloroperoxybenzoic acid (80-85% grade, 2.00 g based on 80%, 9.26 mmol). The reaction mixture was stiπed at 25°C for 17 h, at which time, thm layer chromatography showed the presence of two new lower Rf products. An additional 2.00 g of 3- chloroperoxybenzoic acid was added to the reaction mixture to dnve the conversion of the sulfoxide to the sulfone, and the resulting reaction mixture was stirred at 25°C for 3 d. The reaction mixture was concentrated in vacuo to remove methylene chlonde The resulting residue was diluted with ethyl acetate (300 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 100 mL), washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tnfluoromethanesulfonyl- phenyl)propιonιc acid methyl ester (1.19 g, 95%) as a light yellow oil: EI-HRMS m/e calcd for C16H19F3O4S (M+) 364.0956, found 364.0965. A solution of 3-cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)propιonιc acid methyl ester (708 2 mg, 1 94 mmol) in tetrahydrofuran (2 4 mL) was treated with a 0.8M aqueous lithium hydroxide solution (3.6 mL, 2.92 mmol). The reaction mixture was stiπed at 25 °C for 23 h and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous layer was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (2 x 100 mL). The combined organic layers were washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo to afford a cream solid. This solid was punfied by tnturating with diethyl ether/petroleum ether to provide pure 3-cyclopentyl-2- (4-tnfluoromethanesulfonyl-phenyl)propιonιc acid (527 0 mg, 77%) as a white solid- mp 143-145°C. EI-HRMS m/e calcd for C15Hι7F3O4S (M+) 350.0800, found 350 0816
A solution of 3-cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)propιonιc acid (118.9 mg, 0.34 mmol) and tnphenylphosphme (133 5 mg, 0.51 mmol) m methylene chlonde (848 μL) was cooled to 0°C and then treated with N-bromosuccmimide (102.7 mg, 0.58 mmol) in small portions After the complete addition of N-bromosuccinimide, the reaction mixture was allowed to warm to 25°C where it was stirred for 45 nun. The reaction mixture was then treated with 2-ammopyndιne (95.8 mg, 1.02 mmol) The resulting reaction mixture was stiπed at 25°C for 22 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 5/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-Ν-pyπdιn-2-yl-2-(4- tπfluoromethanesulfonyl-phenyl)-propιonamιde (37.1 mg, 26%) as a light yellow solid: mp 151-153°C; EI-HRMS m/e calcd for C20H2ιF3N2O3S (M+) 426.1225, found 426.1220.
(B) In an analogous manner, there were obtained: (a) From 3-cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)propιonιc acid and 2- ammo-5-chloropyndme: N-(5-Chloro-pyπdιn-2-yl)-3-cyclopentyl-2-(4-tnfluoromethane- sulfonyl-phenyl)-propιonamιde as a cream solid: mp 146-148°C; EI-HRMS m/e calcd for C20H2oClF3N2O3S (NT) 460.0835, found 460.0846. (b) From 3-cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)propιonιc acid and 2- amιno-5-methyl pyndme 3-Cyclopentyl-N-(5-methyl-pyndm-2-yl)-2-(4-tπfluoro- methanesulfonyl-phenyl)-propιonamιde as a pale yellow solid: mp 155-157°C; EI-HRMS m/e calcd for C21H23F3N2O3S (M+) 440.1381, found 440.1376.
(c) From 3-cyclopentyl-2-(4-tπfluoromethanesulfonyl-phenyl)propιonιc acid and 6- aminonicotimc acid methyl ester- 6-[3-Cyclopentyl-2-(4-tnfluoromethanesulfonyl- phenyl)-propιonylamιno]-nιcotmιc acid methyl ester as a yellow foam: mp 58-62°C; EI- HRMS m/e calcd for C22H23F3N2O5S (NT) 484.1280, found 484.1274
Example 44 3-Cyclopentyl-2-(4-methanesulfonyI-3-nitrophenyl)-N-pyridin-2-yl-propionamide
Figure imgf000107_0001
A solution of 4-chloro-3-nιtrophenylacetamιde (2.00 g, 9.32 mmol) in methanol (40 mL) was treated with Amberlyst® 15 ion exchange resm (15.00 g). The resulting reaction mixture was heated under reflux for 64 h The reaction mixture was allowed to cool to 25 °C and then filtered to remove the Amberlyst® 15 ion exchange resin. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 4-chloro-3-nιtrophenylacetιc acid methyl ester (1.91 g, 89%) as a yellow oil. EI-HRMS m/e calcd for C9H8ClNO4 (M+) 229.0142, found 229.0146
A solution of diisopropylamine (3.35 mL, 23.9 mmol) in dry tetrahydrofuran (45 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdιnone (15 mL) was cooled to -78°C and then treated dropwise with a 2.5M solution of n-butyllithium m hexanes (9.56 mL, 23.9 mmol) over a 10 mm penod. The pale yellow reaction mixture was stiπed at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-nιtrophenylacetιc acid methyl ester (5 00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 mm penod The reaction mixture turned deep purple (almost black) in color. The reaction mixture was then stirred at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21 8 mol) in a small amount of dry tetrahydrofuran was added dropwise The reaction mixture was then stiπed at -78°C and then allowed to warm to 25°C, where it was stiπed for 48 h The reaction mixture was quenched with a saturated aqueous ammonium chloπde solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL). The organic phase was washed with a saturated aqueous sodium chloπde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(4-chloro-3-nιtrophenyl)-3-cyclopentyl- propio c acid methyl ester (2.17 g, 32%) as a yellow oil: EI-HRMS m/e calcd for C15Hι8ClNO4 (M+) 311.0924, found 311.0927.
A solution of 2-(4-chloro-3-nιtrophenyl)-3-cyclopentyl-propιomc acid methyl ester (1.00 g, 3.21 mmol) and sodium methanesulfmate (0.36 g, 3.53 mmol) m dimethyl sulfoxide (3 mL) was heated at 130°C for 5 h The black reaction mixture was then poured over ice (20 g), resulting in the formation of a brown sticky substance. The resulting mixture was then treated with ethyl acetate (50 mL) and water (50 mL), and the layers were separated. The aqueous layer was further extracted with ethyl acetate (2 x 50 mL). The combined organic layers were washed with a saturated aqueous sodium chlonde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nιtrophenyl)-propιonιc acid methyl ester (0.95 g, 84%) as a yellow gel FAB-HRMS m/e calcd for Cι6H21NO6S (M+H)+ 356.1169, found 356.1175. A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-nιtrophenyl)-propιonιc acid methyl ester (865 mg, 2 43 mmol) in tetrahydrofuran (6 mL) was treated with a 0 8M aqueous lithium hydroxide solution (4 6 mL, 3 65 mmol) The reaction mixture was stiπed at 25°C for 3 h The reaction mixture was concentrated in vacuo to remove tetrahydrofuran The resulting aqueous residue was diluted with water (25 mL) and then treated with a IN aqueous hydrochlonc acid solution (10 mL) The resulting aqueous layer was then extracted with ethyl acetate (2 x 50 mL) The combined organic layers were dned over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/4 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nιtrophenyl)-propιonιc acid (723 mg, 87%) as a white foam Analytical data indicated the presence of a small impunty, however, the 3-cyclopentyl-2- (4-methanesulfonyl-3-mtrophenyl)-propιonιc acid was used without further puπfication in subsequent reactions
A solution of tnphenylphosphme (138 mg, 0 53 mmol) in methylene chlonde (2 mL) was cooled to 0°C and then slowly treated with N-bromosuccmimide (94 mg, 0 53 mmol) in small portions The reaction mixture was stiπed at 0°C for 10 mm and then treated with 3-cyclopentyl-2-(4-methanesulfonyl-3-nιtrophenyl)-propιonιc acid (150 mg, 0 44 mmol) The resulting reaction mixture was stiπed at 0°C for 5 mm and then allowed to warm to 25°C, where it was stirred for 25 mm The reaction mixture was then treated with 2- ammopyndine (91 mg, 0 97 mmol) The resulting reaction mixture was stirred at 25°C for 15 h The crude reaction mixture was directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 3-cyclopentyl-2- (4-methanesulfonyl-3-nιtrophenyl)-Ν-pyπdm-2-yl-propιonamιde (106 mg, 58%) as a white foam mp 92-95°C (foam to gel), FAB-HRMS m/e calcd for C20H23N3O5S (M+H)+ 418 1436, found 418 1430 Example 45
6- [3-CyclopentyI-2(R)-(3,4-dichloro-phenyl)-propionylamino]-nicotinic acid methyl ester
Figure imgf000110_0001
A mixture of 6-ammomcotmic acid (4.0 g, 28 9 mmol), methanol (75 mL), and concentrated hydrochlonc acid (4 mL) was heated under reflux for 16 h The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol The resulting solid was treated with water (20 mL) and enough sodium bicarbonate to adjust the pH = 8. The solution was then extracted with ethyl acetate (3 x 25 mL). The combined organic layers were dned over sodium sulfate, filtered, and concentrated in vacuo to afford 6-amιnomcotinιc acid methyl ester (3.12 g, 71%) as white foam: EI- HRMS m/e calcd for C7H8N2O2 (M+) 152.0586, found 152.0586.
A solution of tnphenylphosphme (1.23 g, 4.69 mmol) m methylene chlonde (15 mL) was cooled to 0°C and then treated with N-bromosuccmimide (947 mg, 5.32 mmol). The resulting brown-purple solution was stiπed at 0°C for 5 mm and then treated with 3- cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonιc acid (prepared m Example 54, 900 mg, 3.13 mmol). The reaction mixture was stirred at 0°C and then allowed to warm to 25°C over 45 min. The reaction mixture was then treated with 6-ammonιcotιmc acid methyl ester (620 mg, 4.07 mmol) and pyndme (0.38 mL, 4.7 mmol), and the reaction mixture was allowed to stir at 25°C for 20 h. The resulting reaction mixture was diluted with water (15 mL) and then extracted with methylene chloπde (3 x 15 mL). The combined organic layers were dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 9/1 hexanes/ethyl acetate) afforded 6-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionylamino]-nicotinic acid methyl ester (1.10 g, 84%) as a white foam: [α]23 589 = -68.0° (c=0.128, chloroform); FAB-HRMS m/e calcd for C2]H22Cl2N2O3 (M+H)+ 421.1086, found 421.1079.
Example 46
6-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionylamino]-nicotinic acid
Figure imgf000111_0001
A solution of 3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(5-carboxymethylpyridin)-2-yl- propionamide (prepared in Example 38(B)(b), 50 mg, 0.12 mmol) in ethanol (10 mL) at 25°C was treated with a solution of potassium hydroxide (20 mg, 0.36 mmol) in water (2 mL). The reaction was stirred at 25°C for 2 h. At this time, the reaction was diluted with water (5 mL). The ethanol was removed in vacuo. The aqueous layer was then acidified to pH = 2 with a IN aqueous hydrochloric acid solution. This solution was extracted with methylene chloride (3 x 10 mL). The organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate with acetic acid) afforded 6-[3-cyclopentyl-2-(3,4- dichloro-phenyl)-propionylamino]-nicotinic acid (34 mg, 71%) as white foam: EI-HRMS m/e calcd for C20H20C12N2O3 (M+) 406.0851, found 406.0852.
Example 47 6-[2-(4-Chloro-phenyl)-3-cyclopentyl-propionylamino]-nicotinic acid
Figure imgf000112_0001
A solution of 6-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-nιcotιmc acid methyl ester (prepared m Example 31(B)(c), 62.6 mg, 0.16 mmol) tetrahydrofuran/water/methanol (0.40 mL, 3:1:1) was treated with a 2N aqueous sodium hydroxide solution (0.16 mL, 0.32 mmol). The reaction was stirred at 25°C for 24 h The reaction mixture was then poured into water and extracted with chloroform (2 x 30 mL). The aqueous layer was then acidified to pH = 1 with a IN aqueous hydrochlonc acid solution The product was extracted into chloroform/methanol (9:1, 3 x 25 mL), dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate w/acetic acid) afforded 6-[2-(4- chloro-phenyl)-3-cyclopentyl-propιonylammo]-nιcotmιc acid (17.0 mg, 31.5%) as a white solid: mp 206-208°C; EI-HRMS m/e calcd for C20H2IC1N2O2 (M +) 372.1240, found 372.1244.
Example 48 6-[3-Cyclopentyl-2-(4-methanesulfonyl-phenyl)-propionylamino]-nicotinic acid
Figure imgf000112_0002
A solution of 6-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propionylamino]-nicotinic acid methyl ester (prepared in Example 53(B)(a), 100 mg, 0.23 mmol) in tetrahydrofuran (500 μL) was treated with a 0.8M aqueous lithium hydroxide solution (300 μL, 0.23 mmol). The solution was stirred at 25°C for 4 h. The reaction mixture was then directly purified by column chromatography. Flash chromatography (Merck Silica gel 60, 230- 400 mesh, 1/3 methanol/ethyl acetate) afforded 6-[3-cyclopentyl-2-(4-methanesulfonyl- phenyl)-propionylamino]-nicotinic acid (65 mg, 70%) as a white solid: mp 191-193°C; FAB-HRMS m/e calcd for C21H24N2O5S (M+H)+ 417.1484, found 417.1484.
Example 49
3-Cyclopentyl-2(3,4-dichloro-phenyl)-N-(5-hydroxymethyl-pyridin-2-yl)- propionamide
Figure imgf000113_0001
A solution of 3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(5-carboxymethylpyridin)-2-yl- propionamide (prepared in Example 38(B)(b), 398 mg, 0.95 mmol) in diethyl ether (30 mL) cooled to 0°C was treated with lithium aluminum hydride (54 mg, 1.4 mmol). This slurry was allowed to slowly warm to 25°C. The reaction was stirred at 25°C for 16 h. At this time, the reaction was quenched with water (10 mL) and extracted with ethyl acetate (3 x 15 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(5- hydroxymethyl-pyridin-2-yl)-propionamide (131 mg, 35%) as a white foam: EI-HRMS m/e calcd for C20H22C12N2O2 (M+) 392.1058, found 392.1062. Example 50 2-(4-Chloro-phenyl)-3-cyclopentyl-N-(5-hydroxymethyl-pyridin-2-yl)-propionamide
Figure imgf000114_0001
A solution of 6-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-nιcotmιc acid methyl ester (prepared in Example 31(B)(c), 83 3 mg, 0.21 mmol) in tetrahydrofuran (2.1 mL) was added to a cooled (0°C) slurry of lithium aluminum hydnde (12.0 mg, 0.32 mmol) in tetrahydrofuran (1.54 mL) The reaction mixture was stiπed at 0°C for 2.5 h The reaction was then quenched by the dropwise addition of water (25 mL). The reaction was further diluted with water and was then extracted with ethyl acetate (3 x 35 mL). The organics were dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded 2-(4-chloro-phenyl)-3-cyclopentyl-N-(5-hydroxymethyl-pyπdιn-2-yl)- propionamide (12.5 mg, 16.1%) as a white solid: mp 60-62°C; EI-HRMS m/e calcd for C20H23C1N2O2 (M+) 358.1448, found 358.1443.
Example 51 3-Cyclopentyl-2-(3,4-dichloro-phenyl)-N-(5-hydroxy-pyridin-2-yl)-propionamide
Figure imgf000114_0002
A solution of 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonιc acid (prepared in Example 38, 183 mg, 0.63 mmol) in methylene chlonde (6.37 mL) was cooled to 0°C and then treated with a 2.0M solution of oxalyl chloπde in methylene chloπde (0.35 mL, 0.7 mmol) and a few drops of N,N-dιmethylformamιde. The reaction mixture was stirred at 0°C for 10 min and then at 25°C for 30 m . The reaction mixture was then treated with 5-benzyloxy-pyndm-2-ylamιne (281 mg, 1.4 mmol) and N,N-dιιsopropylethylamιne (0.26 mL, 1 5 mmol) The reaction mixture was stiπed at 25°C for 16 h At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded Ν-(5-benzyloxy-pyndm-2-yl)-3-cyclopentyl- 2-(3,4-dιchloro-phenyl)-propιonamιde (150 mg, 50 0%) as a yellow solid: mp 47-49°C; EI-HRMS m/e calcd for C26H26Cl2N2O2 (M+) 469.1449, found 469.1455.
A solution of N-(5-benzyloxy-pyndm-2-yl)-3-cyclopentyl-2-(3,4-dιchloro-phenyl)- propionamide (145.3 mg, 0.3 mmol) m methanol (5.1 mL) was treated with 10% palladium on activated carbon The reaction mixture was stiπed under hydrogen gas at 25°C for 16 h The catalyst was then filtered off through a pad of celite (ethyl acetate). The filtrate was concentrated in vacuo to give 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-N- (5-hydroxy-pyndm-2-yl)-propιonamιde (92.2 mg, 78.5%) as a tan solid- mp 79-81°C; EI- HRMS m/e calcd for C19H2oCl2N2O2 (M+) 378 0896, found 378.0890.
Example 52 3-Cyclopentyl-N-(5-hydroxymethyl-pyridin-2-yl)-2-(4-methanesulfonyl-phenyl)- propionamide
Figure imgf000115_0001
A solution of 6-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propιonylamιno]-nιcotmιc acid methyl ester (prepared in example 53(B)(a), 110 mg, 0.26 mmol) in diethyl ether (500 μL) was cooled to 0°C and then slowly treated with lithium aluminum hydnde (15 mg, 0 38 mmol) The reaction mixture was stirred at 0°C for 30 mm then allowed to warm to 25°C. After 1 h at 25°C, thin layer chromatography still indicated the presence of the starting matenal An additional amount of lithium aluminum hydnde (10 mg, 0.26 mmol) was added to the reaction mixture, and the reaction mixture was allowed to stir at 25°C for 1 h. The reaction mixture was then slowly quenched by the dropwise addition of water (10 mL) The resulting mixture was partitioned between water and ethyl acetate. The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded the 3-cyclopentyl-N-(5-hydroxymethyl-pyndm-2-yl)-2-(4-methanesulfonyl- phenyl)-propιonamιde (60 mg, 57%) as a yellow foam: mp 74-77°C; EI-HRMS m/e calcd for C2ιH26N2O4S (M+) 402.1613, found 402.1617.
Example 53
(A) 3-Cyclopentyl-2-(4-methanesulfonyl-phenyI)-N-(5-methyl-pyridin-2-yl)- propionamide
Figure imgf000116_0001
A solution tnphenylphosphme (177 mg, 0.68 mmol) in methylene chloπde (3 mL) was cooled to 0°C and then treated with N-bromosuccmimide (132 mg, 0.74 mmol) in small portions. The reaction mixture was allowed to warm to 25°C over 30 mm and then was treated with 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propιonιc acid (prepared in Example 3(A), 200 mg, 0.68 mmol). The reaction mixture was stirred at 25°C for 30 mm and then treated with 2-ammo-5-methylpyridme (154 mg, 1.42 mmol). The resulting reaction mixture was stirred at 25°C for 1 h. The crude reaction mixture was directly puπfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford impure 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-(5-methyl- pyπdm-2-yl)-propionamide as a red solid. The impure product was further purified by precipitation from 1/1 hexanes/ethyl acetate to afford pure 3-cyclopentyl-2-(4- methanesulfonyl-phenyl)-N-(5-methyl-pyridm-2-yl)-propionamide (80 mg, 31%) as an off-white solid: mp 184-185°C; EI-HRMS m/e calcd for C2ιH26N2O3S (M+) 386.1664, found 386.1664.
(B) In an analogous manner, there was obtained: (a) From 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propιonic acid and 6- ammonicotinic acid methyl ester: 6-[3-Cyclopentyl-2-(4-methanesulfonyl-phenyl)- propιonylamιno]-mcotinιc acid methyl ester as a yellow foam: mp 82-85°C; EI-HRMS m/e calcd for C22H26N2O5S (M+) 430.1562, found 430.1571.
Example 54
(A) N-(5-Chloro-pyridin-2-yl)-3-cyclopentyl-2(R)-(3,4-dichloro-phenyI)- propionamide
Figure imgf000117_0001
A solution of 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propionιc acid (prepared in Example 38, 5.00 g, 17.4 mmol) in tetrahydrofuran (150 mL) cooled to -78°C was treated with triethylamme (2.77 mL, 19.9 mmol) followed by tnmethylacetyl chloride (2.24 mL, 18.2 mmol). The resulting white sluπy was stiπed at -78°C for 15 min and then at 0°C for 45 min. In a separate flask, a solution of (S)-4-ιsopropyl-2-oxazolidinone (2.14 g, 16.57 mmol) in tetrahydrofuran (80 mL) cooled to -78°C was treated with a 2.0M solution of n- butyllithium in hexanes (8.7 mL, 17.4 mmol). The solution was stirred at -78°C for 10 min and then allowed to warm to 25 °C where it was stiπed for an additional 10 min. At this time, the first reaction mixture was recooled to -78°C. The second reaction mixture was added to the first reaction mixture over a period of 5 min via cannula. The combined reaction was then stiπed at -78°C for 15 min and then allowed to warm to 25°C where it was stiπed for an additional 1.5 h. At this time, the reaction was quenched by the addition of a saturated aqueous sodium bisulfite solution (50 mL) and extracted with ethyl acetate (3 x 40 mL). The combined organic layers were washed with a saturated aqueous sodium bicarbonate solution (1 x 20 mL) and a saturated aqueous sodium chloride solution (1 x 20 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 85/15 hexanes/ethyl acetate) afforded (1) 3-[3-cyclopentyl-2(S)-(3,4-dichloro-phenyl)-propionyl]-4(S)-isopropyl- oxazolidin-2-one (2.15 g, 33%) as a clear oil: [α]23 589 = +87.5° (c=0.160, chloroform); EI-HRMS m/e calcd for C2oH25Cl2NO3 (M+) 397.1211, found 397.1215 and (2) 3-[3- cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-4(S)-isopropyl-oxazolidin-2-one (1.88 g, 28%) as a white solid: mp 71.9-74.6°C; [ ]23 589 = -27.6° (c=0.188, chloroform); EI- HRMS m/e calcd for C2oH25Cl2NO3 (M+) 397.1211, found 397.1212.
A solution of 3-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-4(S)-isopropyl- oxazolidin-2-one (1.88 g, 4.72 mmol) in tetrahydrofuran (73 mL) and water (22 mL) cooled to 0°C was treated with a 30% aqueous hydrogen peroxide solution (2.1 mL) and lithium hydroxide (394 mg, 9.4 mmol). The reaction was stirred at 0°C for 1 h. At this time, the reaction was quenched with a saturated aqueous sodium sulfite solution (16 mL) followed by the addition of a 0.5N aqueous sodium bicarbonate solution (50 mL). The tetrahydrofuran was then removed in vacuo. The residue was diluted with water (40 mL) and extracted with methylene chloride (3 x 20 mL). The aqueous layer was then acidified to pH = 2 with 5N aqueous hydrochloric acid solution and extracted with ethyl acetate (4 x 25 mL). The combined organic layers were then dried over sodium sulfate, filtered, and concentrated in vacuo to afforded of 3-cyclopentyl-2(R)-(3,4-dichloro- phenyl)-propionic acid (928 mg, 70%) as a white solid: mp 75.1-78.3°C; [ ]23 589 = -50.3° (c=0.100, chloroform); EI-HRMS m/e calcd for C14Hι6Cl2O2 (M+) 286.0527, found 286.0535.
A solution of triphenylphosphine (344 mg, 1.31 mmol) in methylene chloride (10 mL) cooled to 0°C was treated with N-bromosuccinimide (263 mg, 1.48 mmol). The reaction solution was stiπed at 0°C for 5 min. At this time, 3-cyclopentyl-2-(R)-(3,4-dichloro- phenyl) propionic acid (250 mg, 0.87 mmol) was added. The reaction was allowed to slowly warm to 25°C over 45 min. At this time, 5-chloro-2-aminopyridine (145 mg, 1.13 mmol) and pyridine (0.11 mL, 1.31 mmol) were added to the reaction mixture. The reaction was stirred at 25°C for 20 h. At this time, the reaction was diluted with water (10 mL) and extracted with methylene chloride (3 x 10 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded Ν-(5-chloro-ρyridin-2- yl)3-cyclopentyl-2-(R)-(3,4-dichloro-phenyl)-propionamide (289 mg, 84%) as a white solid: mp 125-128°C; [α]23 589 = -65.6° (c=0.16, chloroform); EI-HRMS m/e calcd for C,9H19Cl3N2O (M+) 396.0563, found 396.0565.
(B) In an analogous manner, there were obtained:
(a) From 2-amino pyridine and 3-cyclopentyl-2-(R)-(3,4-dichloro-phenyl) propionic acid : 3-Cyclopentyl-2(R)-(3,4-dichloro-phenyl)-N-pyridin-2-yl-propionamide as a white foam: [α]23 589 = -56.2° (c=0.153, chloroform); EI-HRMS m/e calcd for C19H20C12N2O (M+) 362.0953, found 362.0952. (b) From 2-aminothiazole and 3-cyclopentyl-2-(R)-(3,4-dichloro-phenyl) propionic acid: 3-Cyclopentyl-2(R)-(3,4-dichloro-phenyl)-N-thiazol-2-yl-propionamide as a white solid: mp 133.4-136.5°C; [α]23 589 = -66.0° (c=0.106, chloroform); EI-HRMS m/e calcd for C]7Hι8Cl2N2OS (M+) 368.0517, found 368.0519. (c) From 2-(amιno-thιazol-5-yl)-oxo-acetic acid ethyl ester and 3-cyclopentyl-2-(R)-3- cyclopentyl-2-(3,4-dιchlorophenyl)-propιomc acid (2R)-{2-[3-Cyclopentyl-2-(3,4- dιchlorophenyl)-propιonylamιno]-thιazol-5-yl} -oxo-acetic acid ethyl ester as a light yellow foam mp 117-120° C; FAB-HRMS m/e calcd for C2ιH22Cl2N2O4S (M+H)+ 469.0755, found 469.0753.
(d) From ethyl 2-ammo-4-thιazole glyoxylate and 3-cyclopentyl-2-(R)-3-cyclopentyl-2- (3,4-dιchlorophenyl)-propιonιc acid: (2R)-{2-[3-Cyclopentyl-2-(3,4-dιchloro-phenyl)- propιonylammo]-thιazol-4-yl}-oxo-acetιc acid ethyl ester as a white solid: EI-HRMS m e calcd for C2ιH22Cl2N2O4S (M+) 468.0677, found 468.0677
Example 55 3-Cyclopentyl-2-(3,4-dichlorophenyl)-N-(lH-imidazol-2-yl)-propionamide
Figure imgf000120_0001
Cl
A solution of 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid (prepared in Example 38, 200 mg, 0.70 mmol), benzotnazol-l-yloxy-tπs(dιmethylammo)phosphomum hexafluorophosphate (310 mg, 0.70 mmol), N,N-dnsopropylethylamme (244 μL, 1.40 mmol), and 2-ammoιmιdazole sulfate (140 mg, 1.05 mmol) m dry N,N- dimethylformamide (5 mL) was stirred at 25°C under nitrogen for 15 h. The reaction mixture was partitioned between water and ethyl acetate. The organic layer was washed with a IN aqueous hydrochlonc acid solution, washed with water, and washed with a saturated aqueous sodium chlonde solution. The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dιchlorophenyl)- N-(lH-ιmιdazol-2-yl)-propιonamιde (81.4 mg, 33%) as a white solid: mp 58-60°C; EI- HRMS m/e calcd for C17H19Cl2N3O (M+) 351.0905, found 351.0901.
Example 56 3- Cyclopentyl-2- (3,4-dichlorophenyl)-N-(5-methyl-isoxazol-3-yl)-propionamide
Figure imgf000121_0001
A solution of 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid (prepared m Example 38, 70 7 mg, 0.25 mmol) in oxalyl chlonde (215 μL, 2.46 mmol) was cooled to 0°C and then treated with 1 drop of dry N,N-dιmethylformamιde The reaction mixture was stiπed at 0°C for 30 mm and then stiπed at 25°C for 3 h. The reaction mixture was concentrated in vacuo to afford a yellow oil This yellow oil was dissolved m a small amount of methylene chloπde and then slowly added to a solution of 3-amιno-5-methylιsoxazole (48.3 mg. 0 49 mmol) and tπethylamme (68 mL, 0.49 mmol) in methylene chlonde (1.2 mL). The resulting reaction mixture was stiπed at 25°C for 14 h. The reaction mixture was concentrated in vacuo to remove methylene chloπde. The resulting residue was diluted with ethyl acetate (100 mL) and then washed with a 10% aqueous hydrochlonc acid solution. The organic layer was dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dιchlorophenyl)-Ν-(5-methyl-ιsoxazol-3-yl)- propionamide (78.3 mg, 87%) as a yellow glass: mp 84-86°C; FAB-HRMS m/e calcd for C18H20C12N2O2 (M+H)+ 367.0981, found 367.0982 Example 57 3-Cyclopentyl-2-(3,4-dichlorophenyl)-N-oxazol-2-yl-propionamide
Figure imgf000122_0001
A solution of benzotriazol-l-yloxy-tris(dimethylamino)phosphonium hexafluorophosphate (102 mg, 0.23 mmol), 3-cyclopentyl-2-(3,4-dichlorophenyl)- propionic acid (prepared in Example 38, 60 mg, 0.21 mmol), N,N-diisopropylethylamine (73 μL, 0.42 mmol), and 2-aminooxazole (27 mg, 0.31 mmol) in dry N,N- dimethylformamide (1 mL) was stiπed at 25°C under nitrogen for 15 h. The reaction mixture was partitioned between water and ethyl acetate. The organic layer was washed with a IN aqueous hydrochloric acid solution, washed with water, and washed with a saturated aqueous sodium chloride solution. The organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dichlorophenyl)- Ν-oxazol-2-yl-propionamide (34.9 mg, 47%) as a white solid: mp 134-136°C; EI-HRMS m/e calcd for Cι7Hι8Cl2N2O2 (M+) 352.0745, found 352.0750.
Example 58 3-Cyclopentyl-2-(3,4-dichlorophenyl)-N-pyridazin-3-yl-propionamide
Figure imgf000122_0002
A solution of 3-cyclopentyl-2-(3,4-dichlorophenyl)-propionic acid (prepared in Example 38, 625.2 mg, 2.18 mmol), 0-benzotriazol-l-yl-N,N,N',N'-tetramethyluronium hexafluorophosphate (908.3 mg, 2.39 mmol), N,N-diisopropylethylamine (1.1 mL, 6.53 mmol), and 3-aminopyridazine (310.6 mg, 3.27 mmol) in dry N,N-dimethylformamide (11 mL) was stiπed at 25°C under nitrogen for 72 h. The reaction mixture was concentrated in vacuo to remove N,N-dimethylformamide. The resulting residue was diluted with ethyl acetate (200 mL). The organic layer was washed with a 10% aqueous hydrochloric acid solution and washed with a saturated aqueous sodium chloride solution. The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dichlorophenyl)-Ν-pyridazin-3-yl-propionamide (493.8 mg, 62%) as a white foam: mp 70-71°C; EI-HRMS m/e calcd for Cι8H]9Cl2N3O (M+) 363.0905, found 363.0908.
Example 59
3-Cyclopentyl-2-(3,4-dichlorophenyI)-N-pyrimidin-2-yl-propionamide
Figure imgf000123_0001
A solution of 3-cyclopentyl-2-(3,4-dichlorophenyl)-propionic acid (prepared in Example 38, 100 mg, 0.35 mmol) in methylene chloride (1 mL) was treated with 2 drops of dry N,N-dimethylformamide. The reaction mixture was cooled to 0°C and then treated dropwise with oxalyl chloride (34 mL, 0.39 mmol). The reaction mixture was stiπed at 0°C for 10 min and then stirred at 25°C for 2 h. The reaction mixture was concentrated in vacuo. The resulting residue was dissolved in a small amount of methylene chloride and was slowly added to a cooled (0°C) solution of 2-aminopyrimidine (67 mg, 0.70 mmol) in methylene chlonde (1 mL) The resulting reaction mixture was stirred at 0°C for 30 m and then stiπed at 25°C for 2 h The reaction mixture was concentrated in vacuo to remove methylene chlonde The resulting residue was diluted with water and extracted with ethyl acetate (3 x 50 mL) The combined organic extracts were washed with a saturated aqueous sodium chlonde solution. The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dιchlorophenyl)- N-pynmιdιn-2-yl-propιonamιde (85 4 mg, 67%) as a white solid: mp 103-105°C; EI- HRMS m/e calcd for Cι8Hι9Cl2N3O (M+) 363 0905, found 363 0915
Example 60 3-Cyclopentyl-2(R)-(3,4-dichloro-phenyl)-N-pyrimidine-6- yl-propionamide
Figure imgf000124_0001
A solution of 3-cyclopentyl-2(R)-(3,4-dιchlorophenyl)-propιonιc acid (prepared in Example 54(A), 200 mg, 0 69 mmol) in methylene chloπde (5 mL) was treated with 1 drop of N,N-dιmethylformamιde and then cooled to 0°C The reaction mixture was then treated with a 2.0M solution of oxalyl chlonde in methylene chlonde (0.52 mL, 1.04 mmol) The reaction mixture was stiπed at 0°C for 30 mm and then treated with a solution of 4-amιnopynmιdιne (131 mg, 1.38 mmol) in tetrahydrofuran (10 mL) and pyndme (0 28 mL, 3 45 mmol) The resulting reaction mixture was stiπed at 23°C for 14 h The reaction mixture was then diluted with water (10 mL) and extracted with methylene chlonde (3 x 15 mL) The combined organic layers were dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/2 hexanes/ethyl acetate) afforded 3-cyclopentyl-2(R)-(3,4-dιchloro- phenyl)-N-pyrimidin-4-yl-propionamide (147 mg, 60%) as a white solid: mp 166.5- 169.3°C; EI-HRMS m/e calcd for Cι8H19Cl2N3O (M+) 363.0905, found 363.0909.
Example 61 3-CycIopentyl-2-(4-methanesulfinyl-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000125_0001
A solution of diisopropylamine (3.2 mL, 23.16 mmol) in dry tetrahydrofuran (10.3 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (3.4 mL) was cooled to -78°C under nitrogen and then treated with a 10M solution of n-butyllithium in hexanes (2.3 mL, 23.16 mmol). The resulting reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of 4-(methylthio)phenylacetic acid (2.01 g, 11.03 mmol) in dry tetrahydrofuran (10.3 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyrimidinone (3.4 mL). The reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (2.55 g, 12.13 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was stiπed at - 78°C for 30 min and then allowed to warm to 25°C where it was stirred for 24 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochloric acid solution and then extracted with ethyl acetate (1 x 200 mL). The organic layer was washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)propionic acid (1.01 g, 35%) as a cream solid: mp 91-93°C; EI-HRMS m/e calcd for Cι5H20O2S (M+) 264.1184, found 264.1177. A solution of 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)propιonιc acid (200 mg, 0.76 mmol) and tnphenylphosphme (198 mg, 0.76 mmol) in methylene chloπde (2 mL) was cooled to 0°C and then slowly treated with N-bromosuccmimide (150 mg, 0 84 mmol) After the complete addition of N-bromosuccinimide, the reaction mixture was allowed to warm to 25°C over 30 mm. The reaction mixture was then treated with 2-amιnothιazole (160 mg, 1.60 mmol), and the resulting reaction mixture was stirred at 25°C for 15 h. The reaction mixture was then concentrated in vacuo to remove methylene chlonde. The remaining residue was diluted with water and ethyl acetate The organic layer was washed with a IN aqueous hydrochlonc acid solution, washed with a saturated aqueous sodium bicarbonate solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) afforded crude 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-Ν-thιazol-2-yl- propionamide as a yellow solid. Recrystalhzation from 3/1 hexanes/ethyl acetate afforded pure 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-N-thιazol-2-yl-propιonamιde (114 mg, 44%) as a white solid: mp 195-196°C; EI-HRMS m/e calcd for C18H22N2OS2 (M+) 346 1174, found 346 1171.
A solution 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-N-thιazol-2-yl-propιonamιde (75 mg, 0.216 mmol) in methylene chlonde (1 mL) was treated with 3-chloroperoxybenzoic acid (75% grade, 50 mg, 0.216 mmol). The reaction mixture was immediately monitored by thm layer chromatography and the results indicated the immediate absence of starting matenal. The reaction mixture was partitioned between water and methylene chlonde and then washed with a saturated aqueous sodium bicarbonate solution The organic layer was further washed with water and then dned over magnesium sulfate, filtered, and concentrated in vacuo. Recrystalhzation from 1/1 hexanes/ethyl acetate afforded 3- cyclopentyl-2-(4-methanesulfιnyl-phenyl)-N-thιazol-2-yl-propιonamιde (25 mg, 32%) as a white solid: mp 170-173°C; EI-HRMS m/e calcd for C18H22N2O2S2 (M+) 362.1123, found 362.1121. Example 62
{2-[3-Cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)-propionylamino]-thiazol-4- yl}-acetic acid ethyl ester
Figure imgf000127_0001
A solution of diisopropylamine (2 4 mL, 16.80 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdιnone (2.5 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butylhthium m hexanes (6.7 mL, 16.80 mmol) The resulting reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of 4-(tπfluoromethylthιo)phenylacetιc acid (1.89 g, 8.00 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)- pynmidinone (2 5 mL) The reaction mixture was allowed to stir at -78°C for 55 mm, at which time, a solution of lodomethylcyclopentane (1 85 g, 8.80 mmol) in a small amount of dry tetrahydrofuran was added dropwise The reaction mixture was allowed to warm to 25°C where it was stiπed for 41 h The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (1 x 300 mL). The organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl- phenyl)propιonιc acid (1.47 g, 58%) as a cream solid: mp 69-71°C; EI-HRMS m/e calcd for Cι5Hι7F3O2S (M+) 318.0901, found 318.0912. A solution of 3-cyclopentyl-2-(4-trifluoromethylsulfanyl-phenyl)propionic acid (1.33 g, 4.18 mmol) in methanol (10 mL) was treated slowly with 4 drops of concentrated sulfuric acid. The resulting reaction mixture was heated under reflux for 36 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The residue was diluted with ethyl acetate (200 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 100 mL), washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 97/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-trifluoromethylsulfanyl- phenyl)propionic acid methyl ester (1.37 g, 99%) as a light yellow oil: EI-HRMS m/e calcd for Cι6H19F3O2S (M+) 332.1058, found 332.1052.
A solution of 3-cyclopentyl-2-(4-trifluoromethylsulfanyl-phenyl)propionic acid methyl ester (1.14 g, 3.43 mmol) in methylene chloride (8.6 mL) was treated with 3- chloroperoxybenzoic acid (80-85% grade, 2.00 g based on 80%, 9.26 mmol). The reaction mixture was stirred at 25°C for 17 h, at which time, thin layer chromatography showed the presence of two new lower Rf products. An additional 2.00 g of 3- chloroperoxybenzoic acid was added to the reaction mixture to drive the conversion of the sulfoxide to the sulfone, and the resulting reaction mixture was stiπed at 25°C for 3 d. The reaction mixture was concentrated in vacuo to remove methylene chloride. The resulting residue was diluted with ethyl acetate (300 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 100 mL), washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-trifluoromethanesulfonyl- phenyl)propionic acid methyl ester (1.19 g, 95%) as a light yellow oil: EI-HRMS m/e calcd for C,6H19F3O4S (M+) 364.0956, found 364.0965. A solution of 3-cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)propionic acid methyl ester (708.2 mg, 1.94 mmol) in tetrahydrofuran (2.4 mL) was treated with a 0.8M aqueous lithium hydroxide solution (3.6 mL, 2.92 mmol). The reaction mixture was stiπed at 25 °C for 23 h and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous layer was acidified to pH = 2 with a 10% aqueous hydrochloric acid solution and then extracted with ethyl acetate (2 x 100 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo to afford a cream solid. This solid was purified by triturating with diethyl ether/petroleum ether to provide pure 3-cyclopentyl-2- (4-trifluoromethanesulfonyl-phenyl)propionic acid (527.0 mg, 77%) as a white solid: mp 143-145°C; EI-HRMS m/e calcd for C15H17F3O4S (M+) 350.0800, found 350.0816.
A solution of triphenylphosphine (97 mg, 0.371 mmol) in methylene chloride (1.5 mL) was cooled to 0°C and then slowly treated with N-bromosuccinimide (66 mg, 0.371 mmol). The reaction mixture was stiπed at 0°C for 20 min and then treated with 3- cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)propionic acid (100 mg, 0.285 mmol). The resulting reaction mixture was stiπed at 0°C for 10 min, allowed to warm to 25°C, and then treated with ethyl 2-amino-4-thiazoleacetate (123 mg, 0.657 mmol). The resulting reaction mixture was stiπed at 25°C for 3 d. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded {2-[3-cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)- propionyl-amino]-thiazol-4-yl} -acetic acid ethyl ester (107 mg, 72%) as a yellow foam: mp 48-51°C; EI-HRMS m/e calcd for C22H25F3Ν2O5S2 (M+) 518.1157, found 518.1157.
Example 63
N-(5-Bromo-pyridin-2-yl)-3-cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)- propionamide
Figure imgf000130_0001
A solution of diisopropylamine (2.4 mL, 16.80 mmol) m dry tetrahydrofuran (7.5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdιnone (2.5 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butylhthium m hexanes (6.7 mL, 16.80 mmol) The resulting reaction mixture was stiπed at -78°C for 30 mm and then treated dropwise with a solution of 4-(tπfluoromethylthιo)phenylacetιc acid (1.89 g, 8.00 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)- pyπmidmone (2.5 mL). The reaction mixture was allowed to stir at -78°C for 55 mm, at which time, a solution of lodomethylcyclopentane (1.85 g, 8.80 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stirred for 41 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (1 x 300 mL). The organic layer was washed with a saturated aqueous sodium chloπde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl- phenyl)propιomc acid (1.47 g, 58%) as a cream solid: mp 69-71°C; EI-HRMS m/e calcd for Cι5H17F3O2S (M+) 318.0901, found 318.0912. A solution of 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl-phenyl)propιomc acid (1.33 g, 4 18 mmol) m methanol (10 mL) was treated slowly with 4 drops of concentrated sulfunc acid The resulting reaction mixture was heated under reflux for 36 h. The reaction mixture was allowed to cool to 25 °C and then concentrated in vacuo to remove methanol. The residue was diluted with ethyl acetate (200 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 100 mL), washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 97/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tπfluoromethylsulfanyl- phenyl)propιomc acid methyl ester (1.37 g, 99%) as a light yellow oil: EI-HRMS m/e calcd for Cι6H19F3O2S (Mτ) 332.1058, found 332.1052
A solution of 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl-phenyl)propιomc acid methyl ester (1 14 g, 3 43 mmol) in methylene chlonde (8.6 mL) was treated with 3- chloroperoxybenzoic acid (80-85% grade, 2.00 g based on 80%, 9.26 mmol). The reaction mixture was stirred at 25°C for 17 h, at which time, thin layer chromatography showed the presence of two new lower Rf products An additional 2.00 g of 3- chloroperoxybenzoic acid was added to the reaction mixture to dnve the conversion of the sulfoxide to the sulfone, and the resulting reaction mixture was stirred at 25°C for 3 d. The reaction mixture was concentrated in vacuo to remove methylene chlonde. The resulting residue was diluted with ethyl acetate (300 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 100 mL), washed with a saturated aqueous sodium chloπde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tπfluoromethanesulfonyl- phenyl)propιomc acid methyl ester (1.19 g, 95%) as a light yellow oil: EI-HRMS m/e calcd for C16H19F3O4S (M+) 364.0956, found 364.0965. A solution of 3-cyclopentyl-2-(4-tπfluoromethanesulfonyl-phenyl)propιomc acid methyl ester (708.2 mg, 1.94 mmol) in tetrahydrofuran (2.4 mL) was treated with a 0.8M aqueous lithium hydroxide solution (3.6 mL, 2.92 mmol) The reaction mixture was stiπed at 25°C for 23 h and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous layer was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (2 x 100 mL). The combined organic layers were washed with a saturated aqueous sodium chloπde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo to afford a cream solid. This solid was punfied by tnturating with diethyl ether/petroleum ether to provide pure 3-cyclopentyl-2- (4-tnfluoromethanesulfonyl-phenyl)propιonιc acid (527.0 mg, 77%) as a white solid: mp 143-145°C, EI-HRMS m/e calcd for Cι5H17F3O4S (MT) 350.0800, found 350.0816
A solution of tnphenylphosphme (206 mg, 0 785 mmol) in methylene chlonde (4 mL) was cooled to 0°C and then slowly treated with N-bromosuccimmide (140 mg, 0.785 mmol) The reaction mixture was stirred at 0°C for 10 mm and then treated with 3- cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)propιomc acid (250 mg, 0.710 mmol). The resulting reaction mixture was stirred at 0°C for 10 mm and then allowed to warm to 25°C where it was stiπed for 30 min. The reaction mixture was then treated with 2- amιno-5-bromopyndme (271 mg, 1.57 mmol) The resulting reaction mixture was stiπed at 25°C for 15 h The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) afforded the pure Ν-(5-bromo-pyπdm-2-yl)-3-cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)- propionamide (226 mg, 63%) as a yellow foam: mp 130-132°C; EI-HRMS m/e calcd for C2oH20BrF3N2O3S (M+) 504.0330, found 504.0325 Example 64 2-(4-Chloro-3-nitro-phenyl)-3-cyclopentyl-N-thiazol-2-yl-propionamide
Figure imgf000133_0001
A solution of 4-chloro-3-nιtrophenylacetamιde (2.00 g, 9.32 mmol) m methanol (40 mL) was treated with Amberlyst® 15 ion exchange resm (15.00 g) The resulting reaction mixture was heated under reflux for 64 h. The reaction mixture was allowed to cool to 25°C and then filtered to remove the Amberlyst® 15 ion exchange resm. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 4-chloro-3-nιtro-phenylacetιc acid methyl ester (1.91 g, 89%) as a yellow oil. EI-HRMS m/e calcd for C9H8ClNO4 (M +) 229.0142, found 229.0146
A solution of diisopropylamine (3.35 mL, 23.9 mmol) in dry tetrahydrofuran (45 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pyπmιdmone (15 mL) was cooled to -78°C and then treated dropwise with a 2.5M solution of n-butylhthium in hexanes (9.56 mL, 23.9 mmol) over a 10 mm penod. The pale yellow reaction mixture was stirred at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-nιtrophenylacetιc acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 mm penod. The reaction mixture turned deep purple (almost black) in color. The reaction mixture was then stirred at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21.8 mol) a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was then stiπed at -78°C and then allowed to warm to 25°C, where it was stiπed for 48 h. The reaction mixture was quenched with a saturated aqueous ammonium chloπde solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL). The organic phase was washed with a saturated aqueous sodium chlonde solution, dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(4-chloro-3-nιtro-phenyl)-3-cyclopentyl- propiomc acid methyl ester (2.17 g, 32%) as a yellow oil: EI-HRMS m/e calcd for C) 5Hι8ClN04 (M+) 311.0924, found 311.0927.
A solution of 2-(4-chloro-3-nιtro-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (260 mg, 0.834 mmol) in tetrahydrofuran (3 mL) was treated with a 0.8M aqueous lithium hydroxide solution (1.25 mL, 1.00 mmol) The reaction mixture was stirred at 25°C for 15 h The resulting reaction mixture was partitioned between water (50 mL) and ethyl acetate (50 mL) and then treated with a IN aqueous hydrochlonc acid solution (10 mL). The layers were shaken and separated. The aqueous layer was further extracted with ethyl acetate (50 mL) The combined organic layers were dned over magnesium sulfate, filtered, and concentrated in vacuo to afford 2-(4-chloro-3-nιtro-phenyl)-3-cyclopentyl- propiomc acid (243 mg, 98%) as a yellow solid which was used without further punfication: mp 112-115°C; FAB-HRMS m e calcd for CI4Hι6ClNO4 (M+H)+ 298.0847, found 298.0851.
A solution of tnphenylphosphme (105 mg, 0.403 mmol) in methylene chlonde (1 mL) was cooled to 0°C and then slowly treated with N-bromosuccmimide (72 mg, 0.403 mmol) The reaction mixture was stiπed at 0°C for 20 mm and then treated with 2-(4- chloro-3-nιtro-phenyl)-3-cyclopentyl-propιonιc acid (100 mg, 0.336 mmol) The resulting reaction mixture was stirred at 0°C for 10 mm and then allowed to warm to 25°C, where it was stiπed for 20 mm. The reaction mixture was then treated with 2- ammothiazole (74 mg, 0.739 mmol). The resulting reaction mixture was stirred at 25°C for 15 h. The crude reaction mixture was treated with a solution of hexanes/ethyl acetate (2 mL, 3:1) and then directly punfied by flash chromatography (Merck Silica gel 60, 230- 400 mesh, 3/1 hexanes/ethyl acetate). The pure 2-(4-chloro-3-mtro-phenyl)-3- cyclopentyl-N-thιazol-2-yl-propιonamιde (93 mg, 73%) was obtained as a pale yellow foam, mp 68-72°C (foam to gel); EI-HRMS m/e calcd for C17H18ClN3O3S (M+) 379 0757, found 379.0760
Example 65 2-(4-Chloro-3-nitro-phenyl)-3-cyclopentyI-N-pyridin-2-yl-propionamide
Figure imgf000135_0001
A solution of 4-chloro-3-nιtrophenylacetamιde (2.00 g, 9.32 mmol) m methanol (40 mL) was treated with Amberlyst® 15 ion exchange resin (15.00 g). The resulting reaction mixture was heated under reflux for 64 h The reaction mixture was allowed to cool to 25°C and then filtered to remove the Amberlyst® 15 ion exchange resm. The filtrate was concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 4-chloro-3-nιtro-phenylacetιc acid methyl ester (1.91 g, 89%) as a yellow oil: EI-HRMS m/e calcd for C9H8ClNO4 (NT) 229.0142, found 229.0146
A solution of diisopropylamine (3.35 mL, 23.9 mmol) m dry tetrahydrofuran (45 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pyπmιdmone (15 mL) was cooled to -78°C and then treated dropwise with a 2.5M solution of n-butylhthium in hexanes (9.56 mL, 23.9 mmol) over a 10 mm penod. The pale yellow reaction mixture was stiπed at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-nιtrophenylacetιc acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 mm penod The reaction mixture turned deep purple (almost black) in color. The reaction mixture was then stirred at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21.8 mol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was then stiπed at -78°C and then allowed to warm to 25°C, where it was stiπed for 48 h. The reaction mixture was quenched with a saturated aqueous ammonium chlonde solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL). The organic phase was washed with a saturated aqueous sodium chlonde solution, dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(4-chloro-3-nιtro-phenyl)-3-cyclopentyl- propiomc acid methyl ester (2.17 g, 32%) as a yellow oil: EI-HRMS m/e calcd for C15H18ClNO4 (M+) 311.0924, found 311.0927.
A solution of 2-(4-chloro-3-mtro-phenyl)-3-cyclopentyl-propiomc acid methyl ester (260 mg, 0.834 mmol) in tetrahydrofuran (3 mL) was treated with a 0.8M aqueous lithium hydroxide solution (1.25 mL, 1.00 mmol). The reaction mixture was stirred at 25°C for 15 h The resulting reaction mixture was partitioned between water (50 mL) and ethyl acetate (50 mL) and then treated with a IN aqueous hydrochlonc acid solution (10 mL). The layers were shaken and separated. The aqueous layer was further extracted with ethyl acetate (50 mL) The combined organic layers were dned over magnesium sulfate, filtered, and concentrated in vacuo to afford 2-(4-chloro-3-nιtro-phenyl)-3-cyclopentyl- propiomc acid (243 mg, 98%) as a yellow solid which was used without further punfication: mp 112-115°C, FAB-HRMS m/e calcd for Cι4Hι6ClNO4 (M+H)+ 298.0847, found 298.0851.
A solution of tnphenylphosphme (105 mg, 0.403 mmol) in methylene chlonde (1 mL) was cooled to 0°C and then slowly treated with N-bromosuccimmide (72 mg, 0.403 mmol). The reaction mixture was stirred at 0°C for 20 mm and then treated with 2-(4- chloro-3-nιtro-phenyl)-3-cyclopentyl-propιomc acid (100 mg, 0.336 mmol). The resulting reaction mixture was stiπed at 0°C for 10 m and then allowed to warm to 25°C, where it was stiπed for 20 mm. The reaction mixture was then treated with 2- ammopyπdme (70 mg, 0.739 mmol). The resulting reaction mixture was stiπed at 25°C for 15 h The crude reaction mixture was treated with a solution of hexanes/ethyl acetate (2 mL, 3.1) and then directly punfied by flash chromatography (Merck Silica gel 60, 230- 400 mesh, 3/1 hexanes/ethyl acetate). The pure 2-(4-chloro-3-nιtro-phenyl)-3- cyclopentyl-N-pyπdm-2-yl-propιonamιde (60 mg, 48%) was obtained as a pale yellow foam, mp 48-52°C (foam to gel); EI-HRMS m/e calcd for C]9H20C1N3O3 (M+) 373.1193, found 373 1185
Example 66
N-(5-Bromo-pyridin-2-yl)-3-cyclopentyl-2-(4-methanesulfonyl-3-nitro-phenyl)- propionamide
Figure imgf000137_0001
A solution of 4-chloro-3-nιtrophenylacetamιde (2.00 g, 9.32 mmol) m methanol (40 mL) was treated with Amberlyst® 15 ion exchange resm (15.00 g). The resulting reaction mixture was heated under reflux for 64 h. The reaction mixture was allowed to cool to 25°C and then filtered to remove the Amberlyst® 15 ion exchange resm. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 4-chloro-3-nιtrophenylacetιc acid methyl ester (1.91 g, 89%) as a yellow oil: EI-HRMS m/e calcd for C9H8ClNO4 (M+) 229.0142, found 229.0146 A solution of diisopropylamine (3.35 mL, 23.9 mmol) in dry tetrahydrofuran (45 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdmone (15 mL) was cooled to -78°C and then treated dropwise with a 2.5M solution of n-butylhthium in hexanes (9.56 mL, 23.9 mmol) over a 10 mm penod. The pale yellow reaction mixture was stirred at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-mtrophenylacetιc acid methyl ester (5 00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 mm penod The reaction mixture turned deep purple (almost black) in color. The reaction mixture was then stiπed at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21.8 mol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was then stiπed at -78°C and then allowed to warm to 25°C, where it was stiπed for 48 h. The reaction mixture was quenched with a saturated aqueous ammonium chloπde solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL) The organic phase was washed with a saturated aqueous sodium chloπde solution, dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(4-chloro-3-mtrophenyl)-3-cyclopentyl- propionic acid methyl ester (2.17 g, 32%) as a yellow oil: EI-HRMS m/e calcd for C15H18ClNO4 (M+) 311.0924, found 311.0927
A solution of 2-(4-chloro-3-nιtrophenyl)-3-cyclopentyl-propιonιc acid methyl ester (1.00 g, 3.21 mmol) and sodium methanesulfmate (0.36 g, 3.53 mmol) m dimethyl sulfoxide (3 mL) was heated at 130°C for 5 h. The black reaction mixture was then poured over ice (20 g), resulting in the formation of a brown sticky substance. The resulting mixture was then treated with ethyl acetate (50 mL) and water (50 mL), and the layers were separated. The aqueous layer was further extracted with ethyl acetate (2 x 50 mL). The combined organic layers were washed with a saturated aqueous sodium chloπde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nιtrophenyl)-propιonιc acid methyl ester (0.95 g, 84%) as a yellow gel: FAB-HRMS m/e calcd for Cι6H2ιNO6S (M+H)+ 356.1169, found 356.1175.
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-nιtrophenyl)-propιonιc acid methyl ester (865 mg, 2.43 mmol) in tetrahydrofuran (6 mL) was treated with a 0.8M aqueous lithium hydroxide solution (4.6 mL, 3.65 mmol) The reaction mixture was stiπed at 25 °C for 3 h The reaction mixture was concentrated in vacuo to remove tetrahydrofuran The resulting aqueous residue was diluted with water (25 mL) and then treated with a IN aqueous hydrochlonc acid solution (10 mL) The resulting aqueous layer was then extracted with ethyl acetate (2 x 50 mL) The combined organic layers were dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/4 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nιtrophenyl)-propιonιc acid (723 mg, 87%) as a white foam Analytical data indicated the presence of a small impunty, however, the 3-cyclopentyl-2- (4-methanesulfonyl-3-nιtrophenyl)-propιonιc acid was used without further punfication in subsequent reactions
A solution of tnphenylphosphme (212 mg, 0 81 mmol) m methylene chlonde (3 mL) was cooled to 0°C and then slowly treated with N-bromosuccmimide (144 mg, 0.81 mmol) The reaction mixture was stiπed at 0°C for 10 mm and then treated with 3-cyclopentyl-2- (4-methanesulfonyl-3-mtrophenyl)-propιonιc acid (250 mg, 0.73 mmol). The resulting reaction mixture was stiπed at 0°C for 5 mm and then allowed to warm to 25°C, where it was stiπed for 30 mm. The reaction mixture was then treated with 2-amιno-5- bromopyπdme (279 mg, 1 61 mmol). The resulting reaction mixture was stiπed at 25°C for 15 h The crude reaction mixture was directly punfied by flash chromatography, (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate), to afford Ν-(5-bromo- pyndιn-2-yl)-3-cyclopentyl-2-(4-methanesulfonyl-3-nιtro-phenyl)-propιonamιde (121 mg, 33%) as a white foam mp 80-83°C (foam to gel), FAB-HRMS m/e calcd for C20H22BrN3O5S (M+H)+ 496.0542, found 496.0543 Example 67
3-CyclopentyI-2-(3-hydroxyamino-4-methanesulfonyl-phenyl)-N-thiazol-2-yl- propionamide
Figure imgf000140_0001
A solution of 4-chloro-3-nitrophenylacetamide (2.00 g, 9.32 mmol) in methanol (40 mL) was treated with Amberlyst® 15 ion exchange resin (15.00 g). The resulting reaction mixture was heated under reflux for 64 h. The reaction mixture was allowed to cool to 25°C and then filtered to remove the Amberlyst® 15 ion exchange resin. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 4-chloro-3-nitrophenylacetic acid methyl ester (1.91 g, 89%) as a yellow oil: EI-HRMS m/e calcd for C9H8ClNO4 (M*) 229.0142, found 229.0146.
A solution of diisopropylamine (3.35 mL, 23.9 mmol) in dry tetrahydrofuran (45 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (15 mL) was cooled to -78°C and then treated dropwise with a 2.5M solution of π-butyllithium in hexanes (9.56 mL, 23.9 mmol) over a 10 min period. The pale yellow reaction mixture was stirred at -78°C for 20 min and then slowly treated with a solution of 4-chloro-3-nitrophenylacetic acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 min period. The reaction mixture turned deep purple (almost black) in color. The reaction mixture was then stiπed at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (4.58 g, 21.8 mol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was then stirred at -78°C and then allowed to waπn to 25 °C, where it was stiπed for 48 h The reaction mixture was quenched with a saturated aqueous ammonium chloπde solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL) The organic phase was washed with a saturated aqueous sodium chloπde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(4-chloro-3-nιtrophenyl)-3-cyclopentyl- propionic acid methyl ester (2 17 g, 32%) as a yellow oil EI-HRMS m/e calcd for C15HI 8ClNO4 (M+) 311 0924, found 311 0927
A solution of 2-(4-chloro-3-nιtrophenyl)-3-cyclopentyl-propιomc acid methyl ester (1 00 g, 3 21 mmol) and sodium methanesulfmate (0 36 g, 3 53 mmol) in dimethyl sulfoxide (3 mL) was heated at 130°C for 5 h The black reaction mixture was then poured over ice (20 g), resulting in the formation of a brown sticky substance The resulting mixture was then treated with ethyl acetate (50 mL) and water (50 mL), and the layers were separated The aqueous layer was further extracted with ethyl acetate (2 x 50 mL) The combined organic layers were washed with a saturated aqueous sodium chloπde solution, dned over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nιtrophenyl)-propιonιc acid methyl ester (0 95 g, 84%) as a yellow gel FAB-HRMS m/e calcd for C16H21NO6S (M+H)+ 356 1169, found 356 1175
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-nιtrophenyl)-propιomc acid methyl ester (865 mg, 2 43 mmol) in tetrahydrofuran (6 mL) was treated with a 0 8M aqueous lithium hydroxide solution (4 6 mL, 3 65 mmol) The reaction mixture was stirred at 25°C for 3 h The reaction mixture was concentrated in vacuo to remove tetrahydrofuran The resulting aqueous residue was diluted with water (25 mL) and then treated with a IN aqueous hydrochlonc acid solution (10 mL) The resulting aqueous layer was then extracted with ethyl acetate (2 x 50 mL) The combined organic layers were dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/4 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nitrophenyl)-propionic acid (723 mg, 87%) as a white foam. Analytical data indicated the presence of a small impurity; however, the 3-cyclopentyl-2- (4-methanesulfonyl-3-nitrophenyl)-propionic acid was used without further purification in subsequent reactions.
A solution of triphenylphosphine (138 mg, 0.53 mmol) in methylene chloride (2 mL) was cooled to 0°C and then slowly treated with N-bromosuccinimide (94 mg, 0.53 mmol). The reaction mixture was stiπed at 0°C for 10 min and then treated with 3-cyclopentyl-2- (4-methanesulfonyl-3-nitrophenyl)-propionic acid (150 mg, 0.44 mmol). The resulting reaction mixture was stiπed at 0°C for 5 min and then allowed to warm to 25°C, where it was stiπed for 25 min. The reaction mixture was then treated with 2-aminothiazole (97 mg, 0.97 mmol). The resulting reaction mixture was stiπed at 25°C for 15 h. The crude reaction mixture was directly purified by flash chromatography, (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate), to afford 3-cyclopentyl-2-(4-methanesulfonyl- 3-nitrophenyl)-Ν-thiazol-2-yl-propionamide (96 mg, 52%) as a pale yellow solid: mp 121-124°C; FAB-HRMS m/e calcd for C18H2IN3O5S2 (M+H)+ 424.1001, found 424.1000.
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-N-thiazol-2-yl- propionamide (150 mg, 0.354 mmol) in methanol (3 mL) was treated with 10% palladium on activated carbon (50 mg). The reaction mixture was stiπed under a positive pressure of hydrogen gas (balloon) at 25°C and atmospheric pressure for 3 h. The catalyst was then filtered off through a pad of celite, and the celite pad was washed well with ethyl acetate. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 20/1 methylene chloride/methanol) afforded 3-cyclopentyl-2-(3- hydroxyamino-4-methanesulfonyl-phenyl)-N-thiazol-2-yl-propionamide (85 mg, 59%) as a white solid- mp 124-126°C; EI-HRMS m/e calcd for C18H23N3O4S2 (M+) 409.1130, found 409.1131.
Example 68 2-(3-Amino-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thiazol-2-yl-propionamide
Figure imgf000143_0001
A solution of 4-chloro-3-nιtrophenylacetamιde (2.00 g, 9.32 mmol) in methanol (40 mL) was treated with Amberlyst® 15 ion exchange resm (15.00 g). The resulting reaction mixture was heated under reflux for 64 h. The reaction mixture was allowed to cool to 25°C and then filtered to remove the Amberlyst® 15 ion exchange resm. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 4-chloro-3-nιtrophenylacetιc acid methyl ester (1.91 g, 89%) as a yellow oil: EI-HRMS m/e calcd for C9H8ClNO4 (M+) 229.0142, found 229.0146
A solution of diisopropylamine (3.35 mL, 23.9 mmol) in dry tetrahydrofuran (45 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pyπrmdmone (15 mL) was cooled to -78°C and then treated dropwise with a 2.5M solution of n-butylhthium m hexanes (9.56 mL, 23.9 mmol) over a 10 min penod. The pale yellow reaction mixture was stirred at -78°C for 20 mm and then slowly treated with a solution of 4-chloro-3-nιtrophenylacetιc acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 mm penod The reaction mixture turned deep purple (almost black) in color. The reaction mixture was then stirred at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21.8 mol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was then stiπed at -78°C and then allowed to warm to 25°C, where it was stiπed for 48 h. The reaction mixture was quenched with a saturated aqueous ammonium chlonde solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL). The organic phase was washed with a saturated aqueous sodium chlonde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(4-chloro-3-nιtrophenyl)-3-cyclopentyl- propionic acid methyl ester (2.17 g, 32%) as a yellow oil: EI-HRMS m/e calcd for Cι5H18ClNO4 (M+) 311.0924, found 311.0927.
A solution of 2-(4-chloro-3-nιtrophenyl)-3-cyclopentyl-propιonιc acid methyl ester (1.00 g, 3.21 mmol) and sodium methanesulfmate (0.36 g, 3.53 mmol) in dimethyl sulfoxide (3 mL) was heated at 130°C for 5 h. The black reaction mixture was then poured over ice (20 g), resulting in the formation of a brown sticky substance. The resulting mixture was then treated with ethyl acetate (50 mL) and water (50 mL), and the layers were separated. The aqueous layer was further extracted with ethyl acetate (2 x 50 mL). The combined organic layers were washed with a saturated aqueous sodium chlonde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nιtrophenyl)-propιonιc acid methyl ester (0.95 g, 84%) as a yellow gel. FAB-HRMS m/e calcd for C16H2ιNO6S (M+H)+ 356.1169, found 356.1175.
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-nιtrophenyl)-propιonιc acid methyl ester (865 mg, 2.43 mmol) in tetrahydrofuran (6 mL) was treated with a 0.8M aqueous lithium hydroxide solution (4.6 mL, 3.65 mmol) The reaction mixture was stiπed at 25°C for 3 h The reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The resulting aqueous residue was diluted with water (25 mL) and then treated with a IN aqueous hydrochlonc acid solution (10 mL) The resulting aqueous layer was then extracted with ethyl acetate (2 x 50 mL). The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/4 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nitrophenyl)-propionic acid (723 mg, 87%) as a white foam. Analytical data indicated the presence of a small impurity; however, the 3-cyclopentyl-2- (4-methanesulfonyl-3-nitrophenyl)-propionic acid was used without further purification in subsequent reactions.
A solution of triphenylphosphine (138 mg, 0.53 mmol) in methylene chloride (2 mL) was cooled to 0°C and then slowly treated with N-bromosuccinimide (94 mg, 0.53 mmol).
The reaction mixture was stirred at 0°C for 10 min and then treated with 3-cyclopentyl-2-
(4-methanesulfonyl-3-nitrophenyl)-propionic acid (150 mg, 0.44 mmol). The resulting reaction mixture was stiπed at 0°C for 5 min and then allowed to warm to 25°C, where it was stiπed for 25 min. The reaction mixture was then treated with 2-aminothiazole (97 mg, 0.97 mmol). The resulting reaction mixture was stiπed at 25°C for 15 h. The crude reaction mixture was directly purified by flash chromatography, (Merck Silica gel 60,
230-400 mesh, 1/1 hexanes/ethyl acetate), to afford 3-cyclopentyl-2-(4-methanesulfonyl-
3-nitrophenyl)-Ν-thiazol-2-yl-propionamide (96 mg, 52%) as a pale yellow solid: mp
121-124°C; FAB-HRMS m/e calcd for C18H2ιN3O5S2 (M+H)+ 424.1001, found 424.1000.
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-N-thiazol-2-yl- propionamide (100 mg, 0.236 mmol) in methanol (2 mL) was treated with a solution of ammonium chloride (27 mg, 0.500 mmol) in water (200 μL). The reaction mixture was then treated with zinc dust (151 mg, 2.31 mmol). The reaction mixture was heated under reflux for 2 h. The reaction mixture was allowed to cool to 25°C and then filtered through a pad of celite. The celite pad was washed well with methanol. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 2-(3-amino-4-methanesulfonyl-phenyl)-3-cyclopentyl-N- thιazol-2-yl-propιonamιde (40 mg, 43%) as a white solid: mp 207-209°C; EI-HRMS m/e calcd for Cι8H23N3O3S2 (M+) 393.1181, found 393.1180.
Example 69 3-Cyclopentyl-N-thiazol-2-yl-2-(3-trifluoromethanesulfonyl-phenyl)-propionamide
Figure imgf000146_0001
A solution of 3-(tiιfluoromethylthιo)phenylacetic acid (5.00 g, 21.17 mmol) in methanol (50 mL) was treated slowly with 10 drops of concentrated sulfunc acid The resulting reaction mixture was heated under reflux for 18 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The residue was diluted with ethyl acetate (100 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 100 mL), dned over magnesium sulfate, and filtered The filtrate was concentrated in vacuo to afford (3-tnfluoromethylsulfanyl- phenyl)-acetιc acid methyl ester (5.28 g, 99%) as a pale yellow oil which was used without further puπfication: EI-HRMS m/e calcd for Cι0H9F3O2S (M+) 250.0275, found 250 0274
A solution of diisopropylamine (1.5 mL, 10.5 mmol) in dry tetrahydrofuran (27 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pyπmιdmone (8 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butylhthium in hexanes (4.2 mL, 10.5 mmol). The resulting reaction mixture was stirred at -78°C for 30 mm and then treated dropwise with a solution of (3-tπfluoromethylsulfanyl-phenyl)-acetιc acid methyl ester (2.50 g, 10 0 mmol) in a small amount of tetrahydrofuran. The reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (2.10 g, 10 0 mmol) m a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stirred for 15 h. The reaction mixture was quenched with water (50 mL) and then partitioned between water (75 mL) and ethyl acetate (75 mL). The layers were shaken and separated. The organic layer was dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 8/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2- (3-tnfluoromethylsulfanyl-phenyl)-propιonιc acid methyl ester (2.95 g, 89%) as a colorless oil. EI-HRMS m/e calcd for C16H19F3O2S (M+) 332.1058, found 332.1047.
A solution of 3-cyclopentyl-2-(3-tnfluoromethylsulfanyl-phenyl)-propιonιc acid methyl ester (2.75 g, 8.27 mmol) m methylene chloπde (30 mL) was treated with 3- chloroperoxybenzoic acid (80-85% grade, 4.28 g based on 80%, 20.67 mmol). The reaction mixture was stirred at 25°C for 6 h, at which time, thm layer chromatography showed the presence of two new lower Rf products. An additional 4.00 g of 3- chloroperoxybenzoic acid was added to the reaction mixture to dnve the conversion of the sulfoxide to the sulfone, and the resulting reaction mixture was stiπed at 40°C for 3 d The reaction mixture was allowed to cool to 25°C and then partitioned between water (100 mL) and methylene chloπde (100 mL) The layers were shaken and separated. The organic phase was washed twice with a saturated aqueous sodium bicarbonate solution, washed with water, dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/methylene chlonde) afforded 3-cyclopentyl-2-(3-tnfluoromethanesulfonyl-phenyl)-propιonιc acid methyl ester (2.07 g, 69%) as a colorless oil: EI-HRMS m/e calcd for C16H19F3O4S (NT) 364.0956, found 364.0947.
A solution of 3-cyclopentyl-2-(3-tnfluoromethanesulfonyl-phenyl)-propιomc acid methyl ester (1.28 g, 3.52 mmol) in tetrahydrofuran (12 mL) was treated with a 0.8M aqueous lithium hydroxide solution (4.9 mL, 3.88 mmol). The reaction mixture was stiπed at 25°C for 24 h and then concentrated in vacuo to remove tetrahydrofuran. The resulting yellow oil was partitioned between water (50 mL) and ethyl acetate (50 mL) and then treated with a IN aqueous hydrochloric acid solution. The organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3- trifluoromethanesulfonyl-phenyl)-propionic acid (1.09 g, 99%) as a viscous yellow oil that solidified upon sitting to a white solid: mp 86-88°C; EI-HRMS m/e calcd for C,5H17F3O4S (M +) 350.0800, found 350.0792.
A solution of triphenylphosphine (194 mg, 0.74 mmol) in methylene chloride (3 mL) was cooled to 0°C and then slowly treated with N-bromosuccinimide (132 mg, 0.74 mmol). The reaction mixture was stiπed at 0°C for 15 min and then treated with 3-cyclopentyl-2- (3-trifluoromethanesulfonyl-phenyl)-propionic acid (200 mg, 0.57 mmol). The resulting reaction mixture was stirred at 0°C for 5 min and then allowed to warm to 25°C over 30 min. The reaction mixture was then treated with 2-aminothiazole (143 mg, 1.43 mmol). The resulting reaction mixture was stiπed at 25°C for 15 h. The crude reaction mixture was then directly purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) to afford pure 3-cyclopentyl-Ν-thiazol-2-yl-2-(3- trifluoromethanesulfonyl-phenyl)-propionamide (178 mg, 72%) as a light yellow foam: mp 61-64°C (foam to gel); EI-HRMS m/e calcd for Cι8H19F3N2O3S2 (M+) 432.0789, found 432.0790.
Example 70 3-CyclopentyI-2-(3-fluoro-4-trifluoromethyl-phenyl)-N-thiazoI-2-yl-propionamide
Figure imgf000149_0001
A solution of 3-fluoro-4-(tπfluoromethyl)phenylacetιc acid (2.50 g, 11.25 mmol) in methanol (25 mL) was treated slowly with 4 drops of concentrated sulfunc acid. The resulting reaction mixture was heated under reflux for 15 h The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded (3-fluoro-4-tπfluoromethyl-phenyl)-acetιc acid methyl ester (2.58 g, 97%) as a colorless oil. EI-HRMS m/e calcd for Cι0H8F4O2 (M+) 236.0460, found 236.0457
A solution of diisopropylamine (1.5 mL, 10.67 mmol) in dry tetrahydrofuran (24 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdιnone (8 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butyllithium m hexanes (4.3 mL, 10.67 mmol) The resulting reaction mixture was stirred at -78°C for 45 mm and then treated dropwise with a solution of (3-fluoro-4-tπfluoromethyl-phenyl)-acetιc acid methyl ester (2.40 g, 10.16 mmol) m a small amount of tetrahydrofuran. The reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (2.24 g, 10.67 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stirred for 15 h. The reaction mixture was quenched with a saturated aqueous ammonium chloπde solution (10 mL) and then partitioned between water (75 mL) and ethyl acetate (75 mL). The layers were shaken and separated. The aqueous layer was further extracted with ethyl acetate (1 x 75 mL). The combined organic layers were washed with a saturated aqueous sodium chlonde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 5/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3-fluoro-4-trifluoromethyl-phenyl)-propiomc acid methyl ester (2 69 g, 83%) as a colorless oil. EI-HRMS m/e calcd for Cι6Hι8F4O2 (M+) 318.1243, found 318.1250.
A solution of 3-cyclopentyl-2-(3-fluoro-4-tπfluoromethyl-phenyl)-propιonιc acid methyl ester (1.80 g, 5.69 mmol) m tetrahydrofuran (15 mL) was treated with a 0.8M aqueous lithium hydroxide solution (7.1 mL, 5.69 mmol). The reaction mixture was stiπed at 25 °C for 15 h The reaction mixture was concentrated in vacuo. The resulting residue was diluted with ethyl acetate (100 mL) and then washed with a 5% aqueous hydrochlonc acid solution and a saturated aqueous sodium chloπde solution The organic layer was dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2- (3-fluoro-4-tπfluoromethyl-phenyl)-propιonιc acid (1.11 g, 64%) as a white solid: mp 93- 95°C; FAB-HRMS m/e calcd for Cι5H16F4O2 (M+H)+ 305.1165, found 305.1175.
A solution of tnphenylphosphme (312 mg, 1.19 mmol) in methylene chlonde (5 mL) was cooled to 0°C and then slowly treated with N-bromosuccinimide (212 mg, 1.19 mmol). The reaction mixture was stiπed at 0°C for 30 mm and then treated with 3-cyclopentyl-2- (3-fluoro-4-tnfluoromethyl-phenyl)-propιonιc acid (300 mg, 0.99 mmol). The resulting reaction mixture was stirred at 0°C for 15 mm and then allowed to warm to 25°C where it was stiπed for 30 min The reaction mixture was then treated with 2-ammothιazole (218 mg, 2 18 mmol). The resulting reaction mixture was stiπed at 25°C for 3 d The crude reaction mixture was then directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) to afford 3-cyclopentyl-2-(3-fluoro-4- trifluoromethyl-phenyl)-Ν-thιazol-2-yl-propιonamιde (243 mg, 64%) as a white solid: mp 194-195°C; EI-HRMS m/e calcd for C18Hι8F4N2OS (M+) 386.1076, found 386.1076. Example 71 3-CyclopentyI-2-(3-fluoro-4-trifluoromethyl-phenyl)-N-pyridin-2-yl-propionamide
Figure imgf000151_0002
Figure imgf000151_0001
A solution of 3-fluoro-4-(trifluoromethyl)phenylacetic acid (2.50 g, 11.25 mmol) in methanol (25 mL) was treated slowly with 4 drops of concentrated sulfuric acid. The resulting reaction mixture was heated under reflux for 15 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded (3-fluoro-4-trifluoromethyl-phenyl)-acetic acid methyl ester (2.58 g, 97%) as a colorless oil: EI-HRMS m/e calcd for Cι0H8F4O2 (M+) 236.0460, found 236.0457.
A solution of diisopropylamine (1.5 mL, 10.67 mmol) in dry tetrahydrofuran (24 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (8 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of π-butyllithium in hexanes (4.3 mL, 10.67 mmol). The resulting reaction mixture was stirred at -78°C for 45 min and then treated dropwise with a solution of (3-fluoro-4-trifluoromethyl-phenyl)-acetic acid methyl ester (2.40 g, 10.16 mmol) in a small amount of tetrahydrofuran. The reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (2.24 g, 10.67 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stiπed for 15 h. The reaction mixture was quenched with a saturated aqueous ammonium chloride solution (10 mL) and then partitioned between water (75 mL) and ethyl acetate (75 mL). The layers were shaken and separated. The aqueous layer was further extracted with ethyl acetate (75 mL). The combined organic layers were washed with a saturated aqueous sodium chloπde solution, dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 5/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3-fluoro-4-tnfluoromethyl-phenyl)-propιonιc acid methyl ester (2.69 g, 83%) as a colorless oil: EI-HRMS m/e calcd for C16H18F4O2 (M+) 318.1243, found 318.1250.
A solution of 3-cyclopentyl-2-(3-fluoro-4-tπfluoromethyl-phenyl)-propιonιc acid methyl ester (1.80 g, 5.69 mmol) in tetrahydrofuran (15 mL) was treated with a 0.8M aqueous lithium hydroxide solution (7.1 mL, 5.69 mmol). The reaction mixture was stiπed at 25°C for 15 h. The reaction mixture was concentrated in vacuo The resulting residue was diluted with ethyl acetate (100 mL) and then washed with a 5% aqueous hydrochlonc acid solution and a saturated aqueous sodium chlonde solution The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2- (3-fluoro-4-tnfluoromethyl-phenyl)-propιomc acid (1.11 g, 64%) as a white solid: mp 93- 95°C; FAB-HRMS m/e calcd for C15Hι6F4O2 (M+H)+ 305.1165, found 305.1175.
A solution of tnphenylphosphme (312 mg, 1.19 mmol) in methylene chloride (5 mL) was cooled to 0°C and then slowly treated with N-bromosuccmimide (212 mg, 1.19 mmol). The reaction mixture was stirred at 0°C for 30 mm and then treated with 3-cyclopentyl-2- (3-fluoro-4-tnfluoromethyl-phenyl)-propιonιc acid (300 mg, 0.99 mmol). The resulting reaction mixture was stiπed at 0°C for 15 mm and then allowed to warm to 25°C where it was stiπed for 30 mm. The reaction mixture was then treated with 2-amιnopyπdme (205 mg, 2.18 mmol) The resulting reaction mixture was stiπed at 25°C for 3 d. The crude reaction mixture was then directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) to afford 3-cyclopentyl-2-(3-fluoro-4- tnfluoromethyl-phenyl)-Ν-pyπdm-2-yl-propιonamιde (171 mg, 45%) as a pale yellow foam: mp 40-44°C (foam to gel); EI-HRMS m/e calcd for C20H20F4N2O (M+) 380.1512, found 380.1519. Example 72 2-(3-Bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thiazol-2-yl-propionamide
Figure imgf000153_0001
A solution of 4-(methylthιo)phenylacetιc acid (21.21 g, 116 38 mmol) in methanol (291 mL) was treated slowly with concentrated sulfuπc acid (3 mL) The resulting reaction mixture was heated under reflux for 3 d The reaction mixture was allowed to cool to 25 °C and then concentrated in vacuo to remove methanol The resulting residue was diluted with diethyl ether (600 mL) The organic layer was washed with a saturated aqueous sodium bicarbonate solution (3 x 300 mL) and a saturated aqueous sodium chloπde solution (1 x 300 mL) The organic layer was dπed over sodium sulfate, filtered, and concentrated in vacuo to afford (4-methylsulfanyl-phenyl)-acetιc acid methyl ester (20 95 g, 92%) as a yellow liquid which was used without further puπfrcation EI-HRMS m/e calcd for C10H12O2S (M+) 196.0558, found 196 0559
A solution of (4-methylsulfanyl-phenyl)-acetιc acid methyl ester (5.11 g, 26.03 mmol) in carbon tetrachlonde (130 mL) was slowly treated with bromine (1 74 mL, 33.84 mmol). The reaction mixture was stiπed at 25°C for 4 h, at which time, thm layer chromatography still indicated the presence of a substantial amount of starting matenal. The reaction mixture was treated with more bromine (1.74 mL, 33.84 mmol) The reaction mixture was stirred an additional 4 h at 25°C and then quenched with a 10% aqueous sodium bisulfite solution (150 mL) The reaction mixture was concentrated in vacuo to remove carbon tetrachlonde The resulting aqueous layer was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were dned over sodium sulfate, filtered and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded (3-bromo-4-methylsulfanyl-phenyl)-acetιc acid methyl ester (6.10 g, 85%) as a light yellow oil: EI-HRMS m/e calcd for C10HnBrO2S (M +) 273 9663, found 273.9661
A solution of diisopropylamine (3 4 mL, 24.38 mmol) in dry tetrahydrofuran (21 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdmone (7 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butyllithium in hexanes (9.8 mL, 24 38 mmol) The resulting reaction mixture was stiπed at -78°C for 30 mm and then treated dropwise with a solution of (3-bromo-4-methylsulfanyl-phenyl)-acetιc acid methyl ester (6 10 g, 22 17 mmol) dry tetrahydrofuran (21 mL) and l,3-dιmethyl-3,4,5,6- tetrahydro-2(lH)-pynmιdιnone (7 mL) The resulting reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (5.59 g, 26.60 mmol) in a small amount of dry tetrahydrofuran was added dropwise The reaction mixture was allowed to warm to 25°C where it was stiπed for 15 h The reaction mixture was quenched with water (300 mL) and then concentrated in vacuo to remove tetrahydrofuran The remaining aqueous phase was extracted with ethyl acetate (3 x 150 mL) The combined organic layers were washed with a saturated aqueous sodium chloπde solution (1 x 200 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propιomc acid methyl ester (4.52 g, 57%) as a light yellow oik EI-HRMS m/e calcd for Cι6H2ιBrO2S (M+) 356 0446, found 356.0435
A solution of 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (1 07 g, 2.99 mmol) m methylene chlonde (15 mL) was treated with 3- chloroperoxybenzoic acid (57-86% grade, 1.81 g based on 57%, 5.99 mmol) The reaction mixture was stirred at 25 °C for 3 h. The reaction mixture was concentrated in vacuo to remove methylene chloπde. The resulting residue was diluted with diethyl ether (300 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 200 mL) and a saturated aqueous sodium chloπde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl -propionic acid methyl ester (1.09 g, 94%) as a colorless oil: EI-HRMS m/e calcd for Cι6H19BrO4S (M+) 388.0344, found 388.0343.
A solution of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (1 62 g, 4.16 mol) m methanol (10 mL) was treated with a IN aqueous sodium hydroxide solution (8.7 mL, 8.74 mol). The reaction mixture was stiπed at 25°C for 27 h The reaction mixture was concentrated in vacuo to remove methanol. The resulting aqueous residue was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (1 x 400 mL). The organic layer was washed with water (1 x 300 mL) and a saturated aqueous sodium chloride solution (1 x 300 mL) The organic layer was then dned over sodium sulfate, filtered, and concentrated in vacuo to afford 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionic acid (1.39 g, 89%) as a white solid which was used without further punfication mp 149-150°C: FAB-HRMS m/e calcd for C15H19BrO4S (M+H)+ 375.0266, found 375.0274
A solution of tnphenylphosphme (168 mg, 0.64 mmol) in methylene chlonde (3 mL) was cooled to 0°C and then slowly treated with N-bromosuccmimide (114 mg, 0.64 mmol). The reaction mixture was stirred at 0°C for 10 mm and then treated with 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιomc acid (200 mg, 0.53 mmol). The resulting reaction mixture was stiπed at 0°C for 5 mm and then allowed to warm to 25°C where it was stiπed for 25 mm. The reaction mixture was then treated with 2- aminothiazole (117 mg, 1.17 mmol) The resulting reaction mixture was stiπed at 25°C for 15 h The crude reaction mixture was then directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonarmde (214 mg, 88%) as a yellow solid, mp 106-107°C, EI-HRMS m/e calcd for Cι8H2ιBrN2O3S2 (M+) 456.0177, found 456 0175.
Example 73
2-(3-Bromo-4-methanesulfonyl-phenyI)-3-cyclopentyl-N-pyridin-2-yl-propionamide
Figure imgf000156_0001
A solution of 4-(methylthιo)phenylacetιc acid (21.21 g, 116 38 mmol) in methanol (291 mL) was treated slowly with concentrated sulfunc acid (3 mL). The resulting reaction mixture was heated under reflux for 3 d The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol The resulting residue was diluted with diethyl ether (600 mL) The organic layer was washed with a saturated aqueous sodium bicarbonate solution (3 x 300 mL) and a saturated aqueous sodium chloπde solution (1 x 300 mL) The organic layer was dπed over sodium sulfate, filtered, and concentrated in vacuo to afford (4-methylsulfanyl-phenyl)-acetιc acid methyl ester (20.95 g, 92%) as a yellow liquid which was used without further punfication: EI-HRMS m/e calcd for Cι0Hι2O2S (M+) 196.0558, found 196.0559.
A solution of (4-methylsulfanyl-phenyl)-acetιc acid methyl ester (5.11 g, 26.03 mmol) in carbon tetrachlonde (130 mL) was slowly treated with bromine (1.74 mL, 33.84 mmol) The reaction mixture was stirred at 25°C for 4 h, at which time, thm layer chromatography still indicated the presence of a substantial amount of starting matenal The reaction mixture was treated with more bromine (1.74 mL, 33.84 mmol) The reaction mixture was stirred an additional 4 h at 25°C and then quenched with a 10% aqueous sodium bisulfite solution (150 mL). The reaction mixture was concentrated in vacuo to remove carbon tetrachloride. The resulting aqueous layer was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded (3-bromo-4-methylsulfanyl-phenyl)-acetic acid methyl ester (6.10 g, 85%) as a light yellow oil: EI-HRMS m/e calcd for C10HπBrO2S (M+) 273.9663, found 273.9661.
A solution of diisopropylamine (3.4 mL, 24.38 mmol) in dry tetrahydrofuran (21 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (7 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butyllithium in hexanes (9.8 mL, 24.38 mmol). The resulting reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of (3-bromo-4-methylsulfanyl-phenyl)-acetic acid methyl ester (6.10 g, 22.17 mmol) in dry tetrahydrofuran (21 mL) and l,3-dimethyl-3,4,5,6- tetrahydro-2(lH)-pyrimidinone (7 mL). The resulting reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (5.59 g, 26.60 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stiπed for 15 h. The reaction mixture was quenched with water (300 mL) and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (4.52 g, 57%) as a light yellow oil: EI-HRMS m/e calcd for d6H2ιBrO2S (M+) 356.0446, found 356.0435. A solution of 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (1 07 g, 2 99 mmol) in methylene chloπde (15 mL) was treated with 3- chloroperoxybenzoic acid (57-86% grade, 1.81 g based on 57%, 5.99 mmol) The reaction mixture was stiπed at 25°C for 3 h The reaction mixture was concentrated in vacuo to remove methylene chloπde. The resulting residue was diluted with diethyl ether (300 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 200 mL) and a saturated aqueous sodium chloπde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (1.09 g, 94%) as a colorless oil: EI-HRMS m/e calcd for C16Hι9BrO4S (M +) 388.0344, found 388.0343.
A solution of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (1.62 g, 4.16 mol) in methanol (10 mL) was treated with a IN aqueous sodium hydroxide solution (8.7 mL, 8.74 mol). The reaction mixture was stirred at 25°C for 27 h The reaction mixture was concentrated in vacuo to remove methanol. The resulting aqueous residue was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (1 x 400 mL). The organic layer was washed with water (1 x 300 mL) and a saturated aqueous sodium chlonde solution (1 x 300 mL). The organic layer was then dned over sodium sulfate, filtered, and concentrated in vacuo to afford 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionic acid (1.39 g, 89%) as a white solid which was used without further punfication- mp 149-150°C; FAB-HRMS m/e calcd for C15H19BrO4S (M+H)+ 375.0266, found 375.0274.
A solution of tnphenylphosphme (168 mg, 0.64 mmol) in methylene chloride (3 mL) was cooled to 0°C and then slowly treated with N-bromosuccimmide (114 mg, 0.64 mmol). The reaction mixture was stiπed at 0°C for 10 min and then treated with 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (200 mg, 0.53 mmol). The resultmg reaction mixture was stirred at 0°C for 5 mm and then allowed to warm to 25°C where it was stiπed for 25 mm The reaction mixture was then treated with 2- ammopyndme (110 mg, 1 17 mmol) The resulting reaction mixture was stirred at 25°C for 15 h The crude reaction mixture was then directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-N-pyndm-2-yl-propιonamιde (175 mg, 73%) as a white foam mp 99-101°C, FAB-HRMS m/e calcd for C2oH23BrN2O3S (M+H)+ 451 0692, found 451 0689
Example 74
2-(3-Bromo-4-methanesulfonyl-phenyI)-N-(5-bromo-pyridin-2-yl)-3-cyclopentyl- propionamide
Figure imgf000159_0001
A solution of 4-(methylthιo)phenylacetιc acid (21 21 g, 116 38 mmol) in methanol (291 mL) was treated slowly with concentrated sulfuπc acid (3 mL) The resulting reaction mixture was heated under reflux for 3 d The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol The resulting residue was diluted with diethyl ether (600 mL) The organic layer was washed with a saturated aqueous sodium bicarbonate solution (3 x 300 mL) and a saturated aqueous sodium chlonde solution (1 x 300 mL) The organic layer was dπed over sodium sulfate, filtered, and concentrated in vacuo to afford (4-methylsulfanyl-phenyl)-acetιc acid methyl ester (20 95 g, 92%) as a yellow liquid which was used without further punfication EI-HRMS m/e calcd for C10H12O2S (M ; 196 0558, found 196 0559 A solution of (4-methylsulfanyl-phenyl)-acetic acid methyl ester (5.11 g, 26.03 mmol) in carbon tetrachloride (130 mL) was slowly treated with bromine (1.74 mL, 33.84 mmol). The reaction mixture was stiπed at 25°C for 4 h, at which time, thin layer chromatography still indicated the presence of a substantial amount of starting material. The reaction mixture was treated with more bromine (1.74 mL, 33.84 mmol). The reaction mixture was stiπed an additional 4 h at 25°C and then quenched with a 10% aqueous sodium bisulfite solution (150 mL). The reaction mixture was concentrated in vacuo to remove carbon tetrachloride. The resulting aqueous layer was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded (3-bromo-4-methylsulfanyl-phenyl)-acetic acid methyl ester (6.10 g, 85%) as a light yellow oil: EI-HRMS m/e calcd for C10HnBrO2S (M+) 273.9663, found 273.9661.
A solution of diisopropylamine (3.4 mL, 24.38 mmol) in dry tetrahydrofuran (21 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (7 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butyllithium in hexanes (9.8 mL, 24.38 mmol). The resulting reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of (3-bromo-4-methylsulfanyl-phenyl)-acetic acid methyl ester (6.10 g, 22.17 mmol) in dry tetrahydrofuran (21 mL) and l,3-dimethyl-3,4,5,6- tetrahydro-2(lH)-pyrimidinone (7 mL). The resulting reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (5.59 g, 26.60 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stiπed for 15 h. The reaction mixture was quenched with water (300 mL) and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid ethyl ester (4.52 g, 57%) as a light yellow oil: EI-HRMS m/e calcd for C16H21BrO2S (M +) 356.0446, found 356.0435.
A solution of 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (1.07 g, 2.99 mmol) in methylene chloride (15 mL) was treated with 3- chloroperoxybenzoic acid (57-86% grade, 1.81 g based on 57%, 5.99 mmol). The reaction mixture was stiπed at 25°C for 3 h. The reaction mixture was concentrated in vacuo to remove methylene chloride. The resulting residue was diluted with diethyl ether (300 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 200 mL) and a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (1.09 g, 94%) as a colorless oil: EI-HRMS m/e calcd for Cι6Hι9BrO4S (M+) 388.0344, found 388.0343.
A solution of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (1.62 g, 4.16 mol) in methanol (10 mL) was treated with a IN aqueous sodium hydroxide solution (8.7 mL, 8.74 mol). The reaction mixture was stirred at 25°C for 27 h. The reaction mixture was concentrated in vacuo to remove methanol. The resulting aqueous residue was acidified to pH = 2 with a 10% aqueous hydrochloric acid solution and then extracted with ethyl acetate (1 x 400 mL). The organic layer was washed with water (1 x 300 mL) and a saturated aqueous sodium chloride solution (1 x 300 mL). The organic layer was then dried over sodium sulfate, filtered, and concentrated in vacuo to afford 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionic acid (1.39 g, 89%) as a white solid which was used without further purification: mp 149-150°C; FAB-HRMS m/e calcd for Cι5H19BrO4S (M+H)+ 375.0266, found 375.0274. A solution of tnphenylphosphme (154 mg, 0.59 mmol) in methylene chloπde (3 mL) was cooled to 0°C and then slowly treated with N-bromosuccinimide (104 mg, 0.59 mmol) The reaction mixture was stirred at 0°C for 10 mm and then treated with 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (200 mg, 0.53 mmol). The resulting reaction mixture was stiπed at 0°C for 5 mm and then allowed to warm to 25°C where it was stiπed for 30 m The reaction mixture was then treated with 2-amιno-5- bromopyndme (203 mg, 1 17 mmol) The resulting reaction mixture was stirred at 25 °C for 15 h The crude reaction mixture was then directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) to afford the 2-(3-bromo- 4-methanesulfonyl-phenyl)-Ν-(5-bromo-pyndιn-2-yl)-3-cyclopentyl -propionamide (164 mg, 58%) as a white foam: mp 83-86°C (foam to gel); FAB-HRMS m/e calcd for C20H22Br2N2O3S (M+H)+ 528 9796, found 528 9783.
Example 75 2-(3-Cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thiazol-2-yl-propionamide
Figure imgf000162_0001
A solution of 4-(methylthιo)phenylacetιc acid (21.21 g, 116.38 mmol) in methanol (291 mL) was treated slowly with concentrated sulfunc acid (3 mL). The resulting reaction mixture was heated under reflux for 3 d. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol The resulting residue was diluted with diethyl ether (600 mL). The organic layer was washed with a saturated aqueous sodium bicarbonate solution (3 x 300 mL) and a saturated aqueous sodium chlonde solution (1 x 300 mL). The organic layer was dned over sodium sulfate, filtered, and concentrated in vacuo to afford (4-methylsulfanyl-phenyl)-acetιc acid methyl ester (20 95 g, 92%) as a yellow liquid which was used without further puπfication EI-HRMS m/e calcd for C10H,2O2S (M+) 196.0558, found 196.0559
A solution of (4-methylsulfanyl-phenyl)-acetιc acid methyl ester (5.11 g, 26.03 mmol) m carbon tetrachlonde (130 mL) was slowly treated with bromine (1.74 mL, 33.84 mmol) The reaction mixture was stirred at 25 °C for 4 h, at which time, thm layer chromatography still indicated the presence of a substantial amount of starting matenal The reaction mixture was treated with more bromine (1 74 mL, 33.84 mmol) The reaction mixture was stirred an additional 4 h at 25°C and then quenched with a 10% aqueous sodium bisulfite solution (150 mL) The reaction mixture was concentrated in vacuo to remove carbon tetrachlonde The resulting aqueous layer was extracted with ethyl acetate (3 x 150 mL) The combined organic layers were dned over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded (3-bromo-4-methylsulfanyl-phenyl)-acetιc acid methyl ester (6 10 g, 85%) as a light yellow oil EI-HRMS m/e calcd for CιoHπBrO2S (M +) 273 9663, found 273.9661
A solution of diisopropylamine (3 4 mL, 24 38 mmol) in dry tetrahydrofuran (21 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdmone (7 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butyllithium in hexanes (9 8 mL, 24.38 mmol) The resulting reaction mixture was stiπed at -78°C for 30 mm and then treated dropwise with a solution of (3-bromo-4-methylsulfanyl-phenyl)-acetιc acid methyl ester (6 10 g, 22.17 mmol) in dry tetrahydrofuran (21 mL) and l,3-dιmethyl-3,4,5,6- tetrahydro-2(lH)-pynmιdmone (7 mL) The resulting reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (5.59 g, 26.60 mmol) a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stiπed for 15 h. The reaction mixture was quenched with water (300 mL) and then concentrated in vacuo to remove tetrahydrofuran The remaining aqueous phase was extracted with ethyl acetate (3 x 150 mL) The combined organic layers were washed with a saturated aqueous sodium chlonde solution (1 x 200 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (4.52 g, 57%) as a light yellow oil EI-HRMS m/e calcd for Cι6H2ιBrO2S (M+) 356 0446, found 356.0435
A solution of 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propιomc acid methyl ester (1 07 g, 2 99 mmol) in methylene chlonde (15 mL) was treated with 3- chloroperoxybenzoic acid (57-86% grade, 1 81 g based on 57%, 5.99 mmol) The reaction mixture was stirred at 25°C for 3 h The reaction mixture was concentrated in vacuo to remove methylene chloπde The resulting residue was diluted with diethyl ether (300 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 200 mL) and a saturated aqueous sodium chloπde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (1.09 g, 94%) as a colorless oil. EI-HRMS m/e calcd for C16Hι9BrO4S (M+) 388 0344, found 388.0343
A mixture of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιomc acid methyl ester (990 0 mg, 2.54 mmol) and copper(I) cyanide (273.3 mg, 3.05 mmol) in dry N,N- dimethylformamide (2.5 mL) was heated under reflux for 4 h. The reaction was allowed to cool to 25°C, and the crude reaction mixture was directly punfied without further chemical work-up Flash chromatography (Merck Silica gel 60, 70-230 mesh, 100% hexanes then 3/1 hexanes/ethyl acetate) afforded 2-(3-cyano-4-methanesulfonyl-phenyl)- 3-cyclopentyl-propιonιc acid methyl ester (646 5 mg, 76%) as a very light yellow oil: EI- HRMS m/e calcd for C H2ιΝO4S (M+) 335.1191, found 335.1185. A solution of 2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (4.84 g, 14 4 mol) in tetrahydrofuran (25 mL) was treated with a 0.8M aqueous lithium hydroxide solution (27 mL, 21.6 mmol). The reaction mixture was stiπed at 25°C for 2.5 h The reaction mixture was partitioned between water and ethyl acetate and then acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution. The layers were shaken and separated. The resulting organic layer was washed with a saturated aqueous sodium chlonde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo to afford crude 2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (3 80 g, 82%) as a pale yellow oil that solidified to a pale yellow solid. An analytical sample was obtained by recrystalhzation from ethyl acetate to afford 2-(3-cyano-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιomc acid as a white solid: mp 180-181°C, EI-HRMS m/e calcd for d6H19NO4S (M+) 321.1034, found 321.1039.
A solution of tnphenylphosphme (98 mg, 0.37 mmol) in methylene chlonde (1 mL) was cooled to 0°C and then slowly treated with N-bromosuccimmide (67 mg, 0.37 mmol).
The reaction mixture was stiπed at 0°C for 15 mm and then treated with 2-(3-cyano-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (100 mg, 0.31 mmol). The resulting reaction mixture was stirred at 0°C for 5 mm and then allowed to warm to 25°C where it was stirred for 30 mm. The reaction mixture was then treated with 2- ammothiazole (68 mg, 0.68 mmol) The resulting reaction mixture was stiπed at 25°C for 15 h. The crude reaction mixture was then directly punfied by flash chromatography
(Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 2-(3-cyano-4- methanesulfonyl-phenyl)-3-cyclopentyl-Ν-thιazol-2-yl-propιonamιde (117 mg, 93%) as a white solid: mp 145-148°C; EI-HRMS m/e calcd for Cι9H21N3O3S2 (M ") 403.1024, found 403.1023 Example 76 2-(3-Cyano-4-methanesulfonyl-phenyI)-3-cyclopentyl-N-pyridin-2-yl-propionamide
Figure imgf000166_0001
A solution of 4-(methylthio)phenylacetic acid (21.21 g, 116.38 mmol) in methanol (291 mL) was treated slowly with concentrated sulfuric acid (3 mL). The resulting reaction mixture was heated under reflux for 3 d. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The resulting residue was diluted with diethyl ether (600 mL). The organic layer was washed with a saturated aqueous sodium bicarbonate solution (3 x 300 mL) and a saturated aqueous sodium chloride solution (1 x 300 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo to afford (4-methylsulfanyl-phenyl)-acetic acid methyl ester (20.95 g, 92%) as a yellow liquid which was used without further purification: EI-HRMS m/e calcd for C10H12O2S (M+) 196.0558, found 196.0559.
A solution of (4-methylsulfanyl-phenyl)-acetic acid methyl ester (5.11 g, 26.03 mmol) in carbon tetrachloride (130 mL) was slowly treated with bromine (1.74 mL, 33.84 mmol). The resulting reaction mixture was stiπed at 25°C for 4 h, at which time, thin layer chromatography still indicated the presence of a substantial amount of starting material. The reaction mixture was treated with more bromine (1.74 mL, 33.84 mmol). The reaction mixture was stiπed an additional 4 h at 25°C and then quenched with a 10% aqueous sodium bisulfite solution (150 mL). The reaction mixture was concentrated in vacuo to remove carbon tetrachloride. The resulting aqueous layer was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded (3-bromo-4-methylsulfanyl-phenyl)-acetic acid methyl ester (6.10 g, 85%) as a light yellow oil: EI-HRMS m/e calcd for Ci0HnBrO2S (M+) 273.9663, found 273.9661.
A solution of diisopropylamine (3.4 mL, 24.38 mmol) in dry tetrahydrofuran (21 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (7 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of π-butyllithium in hexanes (9.8 mL, 24.38 mmol). The reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of (3-bromo-4-methylsulfanyl-phenyl)-acetic acid methyl ester (6.10 g, 22.17 mmol) in dry tetrahydrofuran (21 mL) and l,3-dimethyl-3,4,5,6-tetrahydro- 2(lH)-pyrimidinone (7 mL). The resulting reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (5.59 g, 26.60 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stiπed for 15 h. The reaction mixture was quenched with water (300 mL) and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (4.52 g, 57%) as a light yellow oil: EI-HRMS m/e calcd for C16H2ιBrO2S (Ivf) 356.0446, found 356.0435.
A solution of 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (1.07 g, 2.99 mmol) in methylene chloride (15 mL) was treated with 3- chloroperoxybenzoic acid (57-86% grade, 1.81 g based on 57%, 5.99 mmol). The reaction mixture was stirred at 25°C for 3 h. The reaction mixture was concentrated in vacuo to remove methylene chloride. The resulting residue was diluted with diethyl ether (300 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 200 mL) and a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (1.09 g, 94%) as a colorless oil EI-HRMS m/e calcd for Cι6Hι9BrO4S (M+) 388.0344, found 388.0343.
A mixture of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (990 0 mg, 2 54 mmol) and copper(I) cyanide (273.3 mg, 3.05 mmol) in dry N,N- dimethylformamide (2.5 mL) was heated under reflux for 4 h The reaction was allowed to cool to 25°C, and the crude reaction mixture was directly punfied without further chemical work-up Flash chromatography (Merck Silica gel 60, 70-230 mesh, 100% hexanes then 3/1 hexanes/ethyl acetate) afforded 2-(3-cyano-4-methanesulfonyl-phenyl)- 3-cyclopentyl-propιonιc acid methyl ester (646.5 mg, 76%) as a very light yellow oil: EI- HRMS m/e calcd for C17H2ιΝO4S (M+) 335.1191, found 335.1185
A solution of 2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (4 84 g, 14 4 mol) in tetrahydrofuran (25 mL) was treated with a 0.8M aqueous lithium hydroxide solution (27 mL, 21.6 mmol) The reaction mixture was stiπed at 25°C for 2.5 h. The reaction mixture was partitioned between water and ethyl acetate and then acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution. The layers were shaken and separated. The resulting organic layer was washed with a saturated aqueous sodium chloπde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo to afford crude 2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιomc acid (3.80 g, 82%) as a pale yellow oil that solidified to a pale yellow solid. An analytical sample was obtained by recrystalhzation from ethyl acetate to afford 2-(3-cyano-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid as a white solid: mp 180-181°C; EI-HRMS m/e calcd for C16Hι9NO4S (M+) 321 1034, found 321.1039. A solution of tnphenylphosphme (98 mg, 0.37 mmol) in methylene chlonde (1 mL) was cooled to 0°C and then slowly treated with N-bromosuccimmide (67 mg, 0.37 mmol) The reaction mixture was stiπed at 0°C for 15 mm and then treated with 2-(3-cyano-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (100 mg, 0.31 mmol) The resulting reaction mixture was stiπed at 0°C for 5 mm and then allowed to warm to 25°C where it was stirred for 30 min The reaction mixture was then treated with 2- aminopyndme (64 mg, 0.68 mmol) The resulting reaction mixture was stiπed at 25°C for 15 h The crude reaction mixture was then directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 2-(3-cyano-4- methanesulfonyl-phenyl)-3-cyclopentyl-Ν-pyπdm-2-yl-propιonamιde (94.5 mg, 76%) as a yellow foam- mp 87-90°C (foam to gel), EI-HRMS m/e calcd for C21H23N3O3S (M+) 397 1460, found 397 1460
Example 77 3-Cyclopentyl-2-(4-ethanesulfonyl-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000169_0001
A mixture of aluminum chloπde (72.35 g, 0.54 mol) in chloroform (181 mL) was cooled to 0°C and stiπed until the solid matenal dissolved The reaction mixture was then slowly treated with ethyl oxalyl chlonde (61 mL, 0.54 mol), and the resulting reaction mixture was stiπed at 0°C for 30 mm The reaction mixture was then slowly treated with ethyl phenyl sulfide (25.00 g, 0.18 mol). The solution turned to a wine color and slowly became gum-like The resulting reaction mixture was then stirred at 0°C for 2 h The reaction mixture was slowly poured into a large amount of ice/water. The resulting aqueous layer was extracted with chloroform (3 x 200 mL). The combined organic layers were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded (4-ethylsulfanyl-phenyl)-oxo-acetιc acid ethyl ester (23.64 g, 55%) as a yellow oil. The matenal was used without further punfication and charactenzation m subsequent reactions
A solution of lodomethylcyclopentane (4.60 g, 21.89 mmol) and tnphenylphosphme (5.74 g, 21.89 mmol) m acetomtnle (22 mL) was heated under reflux for 2 weeks. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to provide an orange solid. The orange solid was tnturated with diethyl ether and then filtered. The solid was washed well with diethyl ether until the washings showed the absence of lodomethylcyclopentane and tnphenylphosphme by thm layer chromatography. The solid was allowed to air dry to afford cyclopentylmethyl tnphenylphosphomum iodide (8.92 g, 86%) as a light orange solid: mp 195-198°C; FAB-HRMS m/e calcd for C24H26P (M+H)+ 345.1772, found 345.1784.
A suspension of cyclopentylmethyl tnphenylphosphomum iodide (24.48 g, 51.82 mmol) in dry tetrahydrofuran (100 mL) was cooled to 0°C and then treated dropwise with a 1.0M solution of sodium bιs(tnmethylsιlyl)amιde m tetrahydrofuran (52 mL, 51.82 mmol). The bnght orange reaction mixture was stiπed at 0°C for 1 h The reaction mixture was then treated with (4-ethylsulfanyl-phenyl)-oxo-acetιc acid ethyl ester (9.50 g, 39.87 mmol). The resulting reaction mixture was allowed to warm to 25°C where it was stiπed for 20 h. The reaction mixture was concentrated in vacuo to remove tetrahydrofuran and then diluted with water (300 mL). The aqueous layer was extracted with ethyl acetate (3 x 200 mL). The combined organic layers were washed with a saturated aqueous sodium chlonde solution (1 x 200 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded the 3-cyclopentyl-2-(4-ethylsulfanyl-phenyl)-acrylιc acid ethyl ester (6 08 g, 50%) as a yellow oil containing a 1.82:1 mixture of (E):(Z) isomers: FAB-LRMS m/e calcd for C] 8H24O2S (M+H)+ integer mass 304, found 305. The isomenc mixture was used without further separation in subsequent reactions.
A solution of 3-cyclopentyl-2-(4-ethylsulfanyl-phenyl)-acryhc acid ethyl ester [5.76 g, 18.92 mmol, (E):(Z) = 1.82:1] in methylene chloπde (47 mL) was slowly treated with 3- chloroperoxybenzoic acid (57-86% grade. 11.45 g based on 57%, 37.83 mmol). The reaction mixture was stiπed at 25°C for 1 h The reaction mixture was concentrated in vacuo to remove methylene chloπde. The resulting residue was diluted with diethyl ether (300 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 200 mL) and a saturated aqueous sodium chloπde solution (1 x 200 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2- (4-ethanesulfonyl-phenyl)-acrylιc acid ethyl ester (4.89 g, 77%) as a colorless oil. The product was a 3T mixture of (E):(Z) isomers that was used without further purification and charactenzation.
A solution of 3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-acryhc acid ethyl ester [4.89 g, 14.53 mmol, (E):(Z) = 3:1] in ethanol (36 mL) was slowly treated with 10% palladium on activated carbon (244.5 mg). The reaction mixture was stiπed under a positive pressure of hydrogen gas (balloon) at 25°C and atmosphenc pressure for 44 h. The catalyst was then filtered off through a pad of celite, and the celite pad was washed well with ethyl acetate. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-ethanesulfonyl- phenyl)-propιonιc acid ethyl ester (3.50 g, 71%) as a colorless viscous oil: FAB-LRMS m/e calcd for 8H26O4S (M+H)+ integer mass 338, found 339.
A solution of 3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-propιomc acid ethyl ester (2.50 g, 7.39 mmol) in tetrahydrofuran (30 mL) was treated with a 0.8M aqueous lithium hydroxide solution (11.1 mL, 8.86 mmol). The reaction mixture was stirred at 25°C for 23 h The resulting reaction mixture was partitioned between water (75 mL) and ethyl acetate (75 mL) and then treated with a IN aqueous hydrochlonc acid solution (15 mL). The layers were shaken and separated The organic layer was dπed over magnesium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2-(4-ethanesulfonyl- phenyl)-propιomc acid (2.20 g, 96%) as a white solid which was used without further puπfication- mp 137-138°C; FAB-HRMS m/e calcd for Cι6H22O4S (M+H)+ 311.1317, found 311.1321.
A solution of tnphenylphosphme (279 mg, 1.06 mmol) in methylene chlonde (5 mL) was cooled to 0°C and then slowly treated with N-bromosuccmimide (189 mg, 1.06 mmol). The reaction mixture was stiπed at 0°C for 20 mm and then treated with 3-cyclopentyl-2- (4-ethanesulfonyl-phenyl)-propιonιc acid (300 mg, 0.97 mmol). The resulting reaction mixture was stirred at 0°C for 10 mm and then allowed to warm to 25°C where it was stiπed for 30 mm. The reaction mixture was then treated with 2-ammothιazole (213 mg, 2 13 mmol) The resulting reaction mixture was stiπed at 25°C for 15 h. The crude reaction mixture was then directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 3-cyclopentyl-2-(4-ethanesulfonyl- phenyl)-Ν-thιazol-2-yl-propιonarmde (330 mg, 87%) as a pale yellow solid: mp 178- 179°C; EI-HRMS m/e calcd for C19H24N2O3S2 (M+) 392.1228, found 392.1230.
Example 78 3-CyclopentyI-2-(4-ethanesulfonyl-phenyl)-N-pyridin-2-yl-propionamide
Figure imgf000172_0001
A mixture of aluminum chloπde (72.35 g, 0.54 mol) in chloroform (181 mL) was cooled to 0°C and stiπed until the solid matenal dissolved The reaction mixture was then slowly treated with ethyl oxalyl chlonde (61 mL, 0.54 mol), and the resulting reaction mixture was stirred at 0°C for 30 m . The reaction mixture was then slowly treated with ethyl phenyl sulfide (25.00 g, 0.18 mol). The solution turned to a wine color and slowly became gum-like The resulting reaction mixture was then stirred at 0°C for 2 h. The reaction mixture was slowly poured into a large amount of ice/water. The resulting aqueous layer was extracted with chloroform (3 x 200 mL). The combined organic layers were dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded (4-ethylsulfanyl-phenyl)-oxo-acetιc acid ethyl ester (23.64 g, 55%) as a yellow oil. The matenal was used without further punfication and charactenzation m subsequent reactions.
A solution of lodomethylcyclopentane (4.60 g, 21.89 mmol) and tnphenylphosphme (5.74 g, 21 89 mmol) in acetomtπle (22 mL) was heated under reflux for 2 weeks. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to provide an orange solid. The orange solid was tnturated with diethyl ether and then filtered. The solid was washed well with diethyl ether until the washings showed the absence of lodomethylcyclopentane and tnphenylphosphme by thin layer chromatography. The solid was allowed to air dry to afford cyclopentylmethyl tnphenylphosphomum iodide (8.92 g, 86%) as a light orange solid: mp 195-198°C; FAB-HRMS m/e calcd for C24H26P (M+H)+ 345.1772, found 345.1784.
A suspension of cyclopentylmethyl tnphenylphosphomum iodide (24.48 g, 51.82 mmol) in dry tetrahydrofuran (100 mL) was cooled to 0°C and then treated dropwise with a 1.0M solution of sodium bιs(tnmethylsιlyl)amιde in tetrahydrofuran (52 mL, 51.82 mmol). The bnght orange reaction mixture was stirred at 0°C for 1 h. The reaction mixture was then treated with (4-ethylsulfanyl-phenyl)-oxo-acetιc acid ethyl ester (9.50 g, 39.87 mmol). The resulting reaction mixture was allowed to warm to 25°C where it was stirred for 20 h. The reaction mixture was concentrated in vacuo to remove tetrahydrofuran and then diluted with water (300 mL). The aqueous layer was extracted with ethyl acetate (3 x 200 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded the 3-cyclopentyl-2-(4-ethylsulfanyl-phenyl)-acrylic acid ethyl ester (6.08 g, 50%) as a yellow oil containing a 1.82:1 mixture of (E):(Z) isomers: FAB-LRMS m/e calcd for C18H24O2S (M+H)+ integer mass 304, found 305.
A solution of 3-cyclopentyl-2-(4-ethylsulfanyl-phenyl)-acrylic acid ethyl ester [5.76 g, 18.92 mmol, (E):(Z) = 1.82:1] in methylene chloride (47 mL) was slowly treated with 3- chloroperoxybenzoic acid (57-86% grade, 11.45 g based on 57%, 37.83 mmol). The reaction mixture was stiπed at 25°C for 1 h. The reaction mixture was concentrated in vacuo to remove methylene chloride. The resulting residue was diluted with diethyl ether (300 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 200 mL) and a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2- (4-ethanesulfonyl-phenyl)-acrylic acid ethyl ester (4.89 g, 77%) as a colorless oil. The product was a 3: 1 mixture of (E):(Z) isomers that was used without further purification and characterization.
A solution of 3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-acrylic acid ethyl ester [4.89 g, 14.53 mmol, (E):(Z) = 3:1] in ethanol (36 mL) was slowly treated with 10% palladium on activated carbon (244.5 mg). The reaction mixture was stirred under a positive pressure of hydrogen gas (balloon) at 25°C and atmospheric pressure for 44 h. The catalyst was then filtered off through a pad of celite, and the celite pad was washed well with ethyl acetate. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-ethanesulfonyl- phenyl)-propιonιc acid ethyl ester (3.50 g, 71%) as a colorless viscous oil: FAB-LRMS m/e calcd for Cι8H26O4S (M+H)+ integer mass 338, found 339.
A solution of 3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-propιonιc acid ethyl ester (2.50 g, 7.39 mmol) in tetrahydrofuran (30 mL) was treated with a 0.8M aqueous lithium hydroxide solution (11.1 mL, 8.86 mmol). The reaction mixture was stirred at 25°C for 23 h The resulting reaction mixture was partitioned between water (75 mL) and ethyl acetate (75 mL) and then treated with a IN aqueous hydrochlonc acid solution (15 mL). The layers were shaken and separated The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2-(4-ethanesulfonyl- phenyl)-propιonιc acid (2.20 g, 96%) as a white solid which was used without further punfication: mp 137-138°C; FAB-HRMS m/e calcd for Cι6H22O4S (M+H)+ 311.1317, found 311.1321.
A solution of tnphenylphosphme (279 mg, 1.06 mmol) in methylene chlonde (5 mL) was cooled to 0°C and then slowly treated with N-bromosuccmimide (189 mg, 1.06 mmol). The reaction mixture was stiπed at 0°C for 20 m and then treated with 3-cyclopentyl-2- (4-ethanesulfonyl-phenyl)-propιonιc acid (300 mg, 0.97 mmol). The resulting reaction mixture was stiπed at 0°C for 10 mm and then allowed to warm to 25°C where it was stiπed for 30 mm. The reaction mixture was then treated with 2-ammopyndme (200 mg, 2.13 mmol) The resulting reaction mixture was stiπed at 25°C for 15 h. The crude reaction mixture was then directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 3-cyclopentyl-2-(4-ethanesulfonyl- phenyl)-Ν-pyndιn-2-yl-propιonamιde (185 mg, 50%) as a pale orange solid: mp 144- 145°C; EI-HRMS m/e calcd for C2ιH26N2O3S (NT) 386.1664, found 386.1660. Example 79 2-(3,4-Bis-methanesulfonyl-phenyl)-3-cyclopentyl-N-thiazoI-2-yl-propionamide
Figure imgf000176_0001
A solution of 3,4-dιfluorophenylacetιc acid (5.00 g, 29.05 mmol) in methanol (73 mL) was slowly treated with concentrated sulfunc acid (4 mL). The resulting reaction mixture was heated under reflux for 65 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The resulting residue was slowly diluted with a saturated aqueous sodium bicarbonate solution (300 mL) and then extracted with ethyl acetate (1 x 300 mL). The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo to afford (3,4-dιfluoro-phenyl)-acetιc acid methyl ester (5.38 g, 99%) as a yellow oil which was used without further punfication
A solution of sodium thiomethoxide (6.39 g, 86.69 mmol) m dimethyl sulfoxide (72 mL) was treated with (3,4-dιfluoro-phenyl)-acetιc acid methyl ester (5.38 g, 28.89 mmol). The reaction mixture was stirred at 25°C for 2 h then heated at 70°C for 15 mm, at which time, thm layer chromatography indicated the absence of starting matenal and the presence of a very polar new product. The reaction indicated that the ester hydrolyzed to the acid upon heating. The resulting reaction mixture was allowed to cool to 25°C. The reaction mixture was then treated with a 10% aqueous hydrochlonc acid solution (200 mL) and then extracted with chloroform (3 x 200 mL). The combined organic layers were dπed over magnesium sulfate, filtered, and concentrated in vacuo to afford a yellow oil. This yellow oil was dissolved in methanol (100 mL) and then slowly treated with concentrated sulfuπc acid (5 mL). The resulting reaction mixture was heated under reflux for 3 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The resulting residue was slowly diluted with a saturated aqueous sodium bicarbonate solution (300 mL) and then extracted with ethyl acetate (1 x 300 mL). The organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo to afford an inseparable, isomeric mixture of (3-fluoro-4-methylsulfanyl-phenyl)-acetic acid methyl ester and (4-fluoro-3-methylsulfanyl-phenyl)-acetic acid methyl ester as a yellow oil (4.65 g, 75%) which was used without further purification and characterization.
A solution of the inseparable, isomeric mixture of (3-fluoro-4-methylsulfanyl-phenyl)- acetic acid methyl ester and (4-fluoro-3-methylsulfanyl-phenyl)-acetic acid methyl ester (4.44 g, 20.72 mmol) in methylene chloride (103 mL) was slowly treated with 3- chloroperoxybenzoic acid (57-86% grade, 13.80 g based on 57%, 45.59 mmol). The reaction mixture was stiπed at 25°C for 4 h. The reaction mixture was concentrated in vacuo to remove methylene chloride. The resulting residue was diluted with ethyl acetate (300 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 200 mL) and a saturated aqueous sodium chloride solution (1 x 200 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 20/1 methylene chloride/ethyl acetate) afforded an inseparable, isomeric mixture of (3-fluoro-4-methanesulfonyl-phenyl)-acetic acid methyl ester and (4-fluoro-3-methanesulfonyl-phenyl)-acetic acid methyl ester as a colorless liquid (3.31 g, 65%) which was used without further purification and characterization.
A solution of the inseparable, isomeric mixture of (3-fluoro-4-methanesulfonyl-phenyl)- acetic acid methyl ester and (4-fluoro-3-methanesulfonyl-phenyl)-acetic acid methyl ester (2.28 g, 9.26 mmol) in dimethyl sulfoxide (23 mL) was treated with sodium thiomethoxide (1.37 g, 18.52 mmol). The reaction mixture was stirred at 25°C for 4 h and then quenched with a 10% aqueous hydrochloric acid solution. The aqueous layer was extracted with chloroform (1 x 400 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/2 hexanes/ethyl acetate) afforded an inseparable, isomenc mixture of (3-methanesulfonyl-4- methylsulfanyl-phenyl)-acetιc acid methyl ester and (4-methanesulfonyl-3- methylsulfanyl-phenyl)-acetιc acid methyl ester as a yellow liquid (2.19 g, 86%) which was used without further punfication and charactenzation.
A solution of the inseparable, isomenc mixture of (3-methanesulfonyl-4-methylsulfanyl- phenyl)-acetιc acid methyl ester and (4-methanesulfonyl-3-methylsulfanyl-phenyl)-acetιc acid methyl ester (2.19 g, 7.98 mmol) m methylene chlonde (20 mL) was slowly treated with 3-chloroperoxybenzoic acid (57-86% grade, 6.41 g based on 57%, 31.93 mmol) The reaction mixture was stiπed at 25°C for 5 h and then slowly quenched with a 1.5N aqueous sodium sulfite solution. The resulting reaction mixture was extracted with methylene chloπde (300 mL) The organic phase was dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 10/1 methylene chloπde/ethyl acetate) afforded (3,4-bιs-methanesulfonyl-phenyl)- acetic acid methyl ester (1.89 g, 77%) as a white solid: mp 157-158°C; EI-HRMS m e calcd for CnH14O6S2 (M+) 306.0232, found 306.0234
A solution of diisopropylamine (951 μL, 6.79 mmol) in dry tetrahydrofuran (6 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdmone (2 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of π-butylhthium in hexanes (2.5 mL, 6.79 mmol). The resultmg reaction mixture was stiπed at -78°C for 30 m and then treated dropwise with a solution of (3,4-bιs-methanesulfonyl-phenyl)-acetιc acid methyl ester (1.89 g, 6.17 mmol) in dry tetrahydrofuran (12 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro- 2(lH)-pyπmιdmone (4 mL). The resulting reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (1.56 g, 7.40 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stirred for 64 h. The reaction mixture was quenched with water (150 mL) and then concentrated in vacuo to remove tetrahydrofuran. The remaining residue was further diluted with water (100 mL) and then extracted with ethyl acetate (1 x 250 mL). The organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(3,4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl- propiomc acid methyl ester (1.61 g, 67%) as a yellow oil: EI-HRMS m/e calcd for C,7H24O6S2 (M+) 388.1014, found 388.1014
A solution of 2-(3,4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (1 17 g, 3 01 mmol) in tetrahydrofuran (12 mL) was treated with a 0.8M aqueous lithium hydroxide solution (5.6 mL, 4.52 mmol) The reaction mixture was stiπed at 25°C for 3 h. The resulting reaction mixture was partitioned between water (75 mL) and ethyl acetate (75 mL) and then treated with a IN aqueous hydrochlonc acid solution (10 mL). The layers were shaken and separated The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo to afford 2-(3,4-bιs- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (1.10 g, 98%) as a white foam which was used without further puπfication: mp 64-68°C (foam to gel); FAB-HRMS m/e calcd for C16H22O6S2 (M+H)+ 375.0936, found 375.0932
A solution of tnphenylphosphme (154 mg, 0.59 mmol) in methylene chlonde (2 mL) was cooled to 0°C and then slowly treated with N-bromosuccmimide (105 mg, 0.59 mmol). The reaction mixture was stiπed at 0°C for 10 mm and then treated with 2-(3,4-bιs- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (200 mg, 0.53 mmol). The resulting reaction mixture was stiπed at 0°C for 5 mm and then allowed to warm to 25°C where it was stiπed for 30 mm. The reaction mixture was then treated with 2- ammothiazole (118 mg, 1.18 mmol). The resulting reaction mixture was stiπed at 25°C for 15 h. The crude reaction mixture was then directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 2-(3,4-bιs- methanesulfonyl-phenyl)-3-cyclopentyl-Ν-thιazol-2-yl-propιonarmde (150 mg, 61%) as a pale yellow foam: mp 104-107°C; EI-HRMS m/e calcd for Cι9H24N2O5S3 (M+) 456.0847, found 456.0846.
Example 80 2-(3,4-Bis-methanesul onyl-phenyI)-3-cyclopentyl-N-pyridin-2-yl-propionamide
Figure imgf000180_0001
A solution of 3,4-difluorophenylacetιc acid (5.00 g, 29.05 mmol) m methanol (73 mL) was slowly treated with concentrated sulfunc acid (4 mL) The resulting reaction mixture was heated under reflux for 65 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The resulting residue was slowly diluted with a saturated aqueous sodium bicarbonate solution (300 mL) and then extracted with ethyl acetate (1 x 300 mL) The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo to afford (3,4-dιfluoro-phenyl)-acetιc acid methyl ester (5.38 g, 99%) as a yellow oil which was used without further puπfication.
A solution of sodium thiomethoxide (6.39 g, 86.69 mmol) in dimethyl sulfoxide (72 mL) was treated with (3,4-dιfluoro-phenyl)-acetιc acid methyl ester (5.38 g, 28.89 mmol). The reaction mixture was stirred at 25°C for 2 h then heated at 70°C for 15 m , at which time, thin layer chromatography indicated the absence of starting matenal and the presence of a very polar new product. The reaction indicated that the ester hydrolyzed to the acid upon heating. The resulting reaction mixture was allowed to cool to 25°C. The reaction mixture was then treated with a 10% aqueous hydrochlonc acid solution (200 mL) and then extracted with chloroform (3 x 200 mL) The combined organic layers were dned over magnesium sulfate, filtered, and concentrated in vacuo to afford a yellow oil This yellow oil was dissolved in methanol (100 mL) and then slowly treated with concentrated sulfuπc acid (5 mL) The resultmg reaction mixture was heated under reflux for 3 h The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol The resulting residue was slowly diluted with a saturated aqueous sodium bicarbonate solution (300 mL) and then extracted with ethyl acetate (1 x 300 mL) The organic layer was dπed over magnesium sulfate, filtered, and concentrated in vacuo to afford an inseparable, isomenc mixture of (3-fluoro-4-methylsulfanyl-phenyl)-acetιc acid methyl ester and (4-fluoro-3-methylsulfanyl-phenyl)-acetιc acid methyl ester as a yellow oil (4 65 g, 75%) which was used without further punfication and charactenzation
A solution of the inseparable, isomenc mixture of (3-fluoro-4-methylsulfanyl-phenyl)- acetic acid methyl ester and (4-fluoro-3-methylsulfanyl-phenyl)-acetic acid methyl ester (4 44 g, 20 72 mmol) in methylene chlonde (103 mL) was slowly treated with 3- chloroperoxybenzoic acid (57-86% grade, 13 80 g based on 57%, 45 59 mmol) The reaction mixture was stiπed at 25°C for 4 h The reaction mixture was concentrated in vacuo to remove methylene chlonde The resulting residue was diluted with ethyl acetate (300 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 200 mL) and a saturated aqueous sodium chloπde solution (1 x 200 mL), dned over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 20/1 methylene chlonde/ethyl acetate) afforded an inseparable, isomenc mixture of (3-fluoro-4-methanesulfonyl-phenyl)-acetιc acid methyl ester and (4-fluoro-3-methanesulfonyl-phenyl)-acetιc acid methyl ester as a colorless liquid (3 31 g, 65%) which was used without further puπfication and charactenzation
A solution of the inseparable, isomenc mixture of (3-fluoro-4-methanesulfonyl-phenyl)- acetic acid methyl ester and (4-fluoro-3-methanesulfonyl-phenyl)-acetιc acid methyl ester (2 28 g, 9 26 mmol) in dimethyl sulfoxide (23 mL) was treated with sodium thiomethoxide (1.37 g, 18.52 mmol). The resulting reaction mixture was stiπed at 25°C for 4 h and then quenched with a 10% aqueous hydrochlonc acid solution. The aqueous layer was extracted with chloroform (1 x 400 mL), dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/2 hexanes/ethyl acetate) afforded an inseparable, isomenc mixture of (3-methanesulfonyl-4- methylsulfanyl-phenyl)-acetιc acid methyl ester and (4-methanesulfonyl-3- methylsulfanyl-phenyl)-acetιc acid methyl ester as a yellow liquid (2.19 g, 86%) which was used without further punfication and charactenzation.
A solution of the inseparable, isomenc mixture of (3-methanesulfonyl-4-methylsulfanyl- phenyl)-acetιc acid methyl ester and (4-methanesulfonyl-3-methylsulfanyl-phenyl)-acetιc acid methyl ester (2.19 g, 7.98 mmol) in methylene chlonde (20 mL) was slowly treated with 3-chloroperoxybenzoic acid (57-86% grade, 6.41 g based on 57%, 31.93 mmol) The reaction mixture was stiπed at 25°C for 5 h and then slowly quenched with a 1.5N aqueous sodium sulfite solution. The resulting reaction mixture was extracted with methylene chloπde (300 mL) The organic phase was dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 10/1 methylene chlonde/ethyl acetate) afforded (3,4-bιs-methanesulfonyl-phenyl)- acetic acid methyl ester (1.89 g, 77%) as a white solid: mp 157-158°C; EI-HRMS m/e calcd for d ιH14O6S2 (M+) 306.0232, found 306.0234.
A solution of diisopropylamine (951 μL, 6.79 mmol) m dry tetrahydrofuran (6 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdmone (2 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of π-butylhthium in hexanes (2.5 mL, 6.79 mmol) The resulting reaction mixture was stirred at -78°C for 30 mm and then treated dropwise with a solution of (3,4-bιs-methanesulfonyl-phenyl)-acetιc acid methyl ester (1.89 g, 6.17 mmol) in dry tetrahydrofuran (12 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro- 2(lH)-pynmιdmone (4 mL). The resulting reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (1.56 g, 7.40 mmol) m a small amount of dry tetrahydrofuran was added dropwise The reaction mixture was allowed to warm to 25°C where it was stiπed for 64 h. The reaction mixture was quenched with water (150 mL) and then concentrated in vacuo to remove tetrahydrofuran. The remaining residue was further diluted with water (100 mL) and then extracted with ethyl acetate (1 x 250 mL). The organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(3,4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl- propiomc acid methyl ester (1.61 g, 67%) as a yellow oil: EI-HRMS m/e calcd for C17H24O6S2 (M+) 388.1014, found 388.1014.
A solution of 2-(3,4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl -propionic acid methyl ester (1.17 g, 3.01 mmol) in tetrahydrofuran (12 mL) was treated with a 0.8M aqueous lithium hydroxide solution (5.6 mL, 4.52 mmol) The reaction mixture was stiπed at 25°C for 3 h. The resultmg reaction mixture was partitioned between water (75 mL) and ethyl acetate (75 mL) and then treated with a IN aqueous hydrochlonc acid solution (10 mL). The layers were shaken and separated The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo to afford 2-(3,4-bιs- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (1.10 g, 98%) as a white foam which was used without further punfication: mp 64-68°C (foam to gel); FAB-HRMS m/e calcd for C16H22O6S2 (M+H)+ 375.0936, found 375.0932.
A solution of tnphenylphosphme (154 mg, 0.59 mmol) in methylene chlonde (2 mL) was cooled to 0°C and then slowly treated with N-bromosuccimmide (105 mg, 0.59 mmol) The reaction mixture was stirred at 0°C for 10 min and then treated with 2-(3,4-bιs- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (200 mg, 0.53 mmol). The resulting reaction mixture was stiπed at 0°C for 5 mm and then allowed to warm to 25°C where it was stiπed for 30 mm The reaction mixture was then treated with 2- ammopyndme (110 mg, 1.18 mmol) The resulting reaction mixture was stiπed at 25°C for 15 h The crude reaction mixture was then directly punfied by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 2-(3,4-bιs- methanesulfonyl-phenyl)-3-cyclopentyl-N-pyndm-2-yl-propιonamιde (117 mg, 49%) as a pale yellow foam- mp 107-110°C; EI-HRMS m/e calcd for C21H26N2O5S2 (M+) 450.1283, found 450.1282.
Example 81 3-Cyclopentyl-2-(3,4-dichlorophenyl)-N-[l,2,4]triazin-3-yl-propionamide
Figure imgf000184_0001
A solution of 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid (prepared in Example 38, 400 mg, 1.40 mmol) m dry pyπdine (5 mL) was treated with 1,3- dicyclohexylcarbodnmide (316 mg, 1.53 mmol) The reaction mixture was stiπed at 25°C for 3.5 h and then treated with 3-ammo-l,2,4-tπazme (296 mg, 3.08 mmol) and an additional amount of pyndme (1 mL) The reaction mixture was warmed at 100°C for 20 h The reaction mixture was concentrated in vacuo to remove pyndme. The resulting residue was diluted with ethyl acetate then filtered. The filtrate was washed with a IN aqueous hydrochlonc acid solution and washed with water. The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 ethyl acetate/hexanes) afforded 3-cyclopentyl-2- (3,4-dιchlorophenyl)-N-[l,2,4]tnazιn-3-yl-propιonarmde (40.9 mg, 8%) as a yellow- orange solid: mp 81-83°C; EI-HRMS m/e calcd for CπH18Cl2N4O (M+) 364.0858, found 364 0857 Example 82 3-CyclopentyI-2-(4-sulfamoyl-phenyl)-N-thiazoI-2-yl-propionamide
Figure imgf000185_0001
A solution of diisopropylamine (3.3 mL, 23.5 mmol) in dry tetrahydrofuran (50 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (10 mL) was cooled to -78°C under nitrogen and then treated with a 10M solution of n-butyllithium in hexanes (2.35 mL, 23.5 mmol). The yellow reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of 4-methylsulfonylphenylacetic acid (2.40 g, 11.2 mmol) in a small amount of dry tetrahydrofuran. After approximately one-half of the 4- methylsulfonylphenylacetic acid in dry tetrahydrofuran was added, a precipitate formed. Upon further addition of the remaining 4-methylsulfonylphenylacetic acid in dry tetrahydrofuran, the reaction mixture became thick in nature. After complete addition of the 4-methylsulfonylphenylacetic acid in dry tetrahydrofuran, the reaction mixture was very thick and became difficult to stir. An additional amount of dry tetrahydrofuran (20 mL) was added to the thick reaction mixture, and the reaction mixture was stiπed at - 78°C for 45 min, at which time, a solution of iodomethylcyclopentane (2.35 g, 11.2 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stiπed for 15 h. The reaction mixture was quenched with water (100 mL), and the resulting yellow reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The aqueous residue was acidified to pH = 2 using concentrated hydrochloric acid. The aqueous layer was extracted with ethyl acetate. The organic phase was dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ ethyl acetate) afforded 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propionic acid (1.80 g, 52%) as a white solid: mp 152-154°C; EI-HRMS m/e calcd for C15H20O4S (M+) 296 1082, found 296.1080.
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propιonιc acid (4.91 g, 16.56 mmol) and tnphenylphosphme (6.52 g, 24.85 mmol) in methylene chlonde (41 mL) was cooled to 0°C and then treated with N-bromosuccimmide (5.01 g, 28.16 mmol) in small portions. The reaction mixture color changed from light yellow to a darker yellow then to brown After the complete addition of N-bromosuccmimide, the reaction mixture was allowed to warm to 25°C over 30 mm The brown reaction mixture was then treated with 2-ammothιazole (4.98 g, 49.69 mmol). The resulting reaction mixture was stirred at 25°C for 19 h The reaction mixture was then concentrated in vacuo to remove methylene chloπde. The remaining black residue was diluted with a 10% aqueous hydrochlonc acid solution (400 mL) and then extracted with ethyl acetate (3 x 200 mL). The combined organic layers were washed with a saturated aqueous sodium chlonde solution (1 x 200 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 1/3 hexanes/ethyl acetate then 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-Ν-thιazol-2- yl-propionamide (4.49 g, 72%) as a white solid: mp 216-217°C; EI-HRMS m/e calcd for CI8H22N2O3S2 (M +) 378.1072, found 378.1071
A solution of diisopropylamine (559 μL, 3.99 mmol) in dry tetrahydrofuran (1.2 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butyllithium in hexanes (1.6 mL, 3.99 mmol). The resulting reaction mixture was allowed to warm to 0°C and then was treated with 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-thιazol-2- yl-propionamide (463.1 mg, 1.22 mmol) in small portions. The reaction mixture turned orange in color The reaction mixture was then allowed to warm to 25°C where it was stirred for 30 mm. After 30 mm at 25°C, the reaction mixture was cooled back down to 0°C and then treated with a IM solution of tπbutylborane in tetrahydrofuran (1.8 mL, 1.84 mmol). The resulting reaction mixture was stiπed at 0°C for 10 mm then allowed to waπn to 25°C. The reaction mixture was stiπed at 25°C for 30 min then heated under reflux for 20 h. The reaction mixture was cooled to 0°C and then treated with water (3 mL) followed by sodium acetate (702.5 mg, 8.56 mmol) and then finally hydroxyamine- O-sulfonic acid (484.2 mg, 4.28 mmol). The resulting reaction mixture was stiπed at 0°C for 30 min then allowed to warm to 25°C where it was stirred for 44 h. The reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The resulting aqueous residue was diluted with ethyl acetate (150 mL). The organic layer was washed with a saturated aqueous sodium bicarbonate solution (1 x 100 mL) and a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/2 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-sulfamoyl-phenyl)-N-thiazol-2-yl- propionamide (191.8 mg, 72%) as a white solid: mp 179-181°C; EI-HRMS m/e calcd for C17H21N3O2S2 (M+) 379.1024, found 379.1029.
Example 85
3-Cyclopentyl-2-(3,4-dichlorophenyl)-N-[l,3,4]thiadiazol-2-yl-propionamide
Figure imgf000187_0001
A solution of 3-cyclopentyl-2-(3,4-dichlorophenyl)-propionic acid (prepared from Example 38, 200.0 mg, 0.70 mmol), O-benzotriazol-l-yl-N,N,N',N'-tetramethyluronium hexafluorophosphate (316.9 mg, 0.84 mmol), N,N-diisopropylethylamine (365 mL, 2.09 mmol), and 2-amino-l,3,4-thiadiazole (140.8 mg, 1.39 mmol) in dry N,N- dimethylformamide (2 mL) was stirred at 25°C under nitrogen for 20 h. The reaction mixture was concentrated in vacuo to remove N,N-dimethylformamide. The resulting residue was diluted with ethyl acetate (100 mL). The organic layer was washed with a saturated aqueous sodium bicarbonate solution (1 x 50 mL), a 10% aqueous hydrochloric acid solution (1 x 100 mL), and a saturated aqueous sodium chloride solution (1 x 100 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dichlorophenyl)-N-[l,3,4]thiadiazol-2-yl- propionamide (197.3 mg, 77%) as a white foam: mp 90-91°C; EI-HRMS m e calcd for Cι6Hι7Cl2N3OS (M+) 369.0469, found 369.0476.
Example 86 (A) 2-(4-Cyano-phenyl)-3-cyclopentyl-N-thiazol-2-yl-propionamide
Figure imgf000188_0001
A solution of freshly prepared lithium dusopropylamide (23 mL of a 0.32M stock solution, 7.13 mmol) cooled to -78°C was treated with (4-bromo-phenyl)-acetic acid methyl ester (1.48 g, 6.48 mmol) in tetrahydrofuran/l,3-dimethyl-3,4,5,6-tetrahydro- 2(lH)-pyrimidinone (16.2 mL, 3: 1). The resulting solution was stirred at -78°C for 45 min. lodomethylcyclopentane (1.49 g, 7.13 mmol) was then added in 1,3-dimethyl- 3,4,5,6-tetrahydro-2(lH)-pyrimidinone (2 mL). The reaction mixture was stiπed at -78°C for 4 h. The reaction was then warmed to 25°C and was stirred at 25°C for 18 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (10 mL). This mixture was poured into water (100 mL) and extracted with ethyl acetate (3 x 50 mL). The organics were washed with a saturated aqueous lithium chloride solution (1 x 50 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 95/5 hexanes/ethyl acetate) afforded 2-(4-bromo-phenyl)-3-cyclopentyl-propionic acid methyl ester (1.60 g, 79 3%) as a clear oil: EI-HRMS m/e calcd for C15Hι9O2Br (M+) 310.0568 found 310.0564.
A solution of 2-(4-bromo-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (500 mg, 1.60 mmol) in N,N-dimethylformarmde (4.01 mL) was treated with copper(I) cyanide (144 mg, 1 60 mmol) The mixture was heated at 170°C for 1 h. At this time, the reaction was cooled to 25°C and poured into aqueous ammonium hydroxide (5 mL). The solution was diluted with water (25 mL) and extracted with ethyl acetate (3 x 35 mL) The organics were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded 2-(4-cyano-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (65.6 g, 15.8%) as a clear oil: EI-HRMS m/e calcd for C16Hι9ΝO2 (M+) 257.1415 found 257.1406.
A solution of 2-(4-cyano-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (65.0 mg, 0.25 mmol) in tetrahydrofuran/water/methanol (2.5 mL, 3.1:1) was treated with a IN aqueous lithium hydroxide solution (0.27 mL, 0.27 mmol). The reaction was stiπed at 25°C for 6 h. At this time, the reaction was acidified to pH = 1 with a IN aqueous hydrochlonc acid solution and extracted with chloroform/methanol (9:1, 3 x 25 mL). The organics were dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 2-(4-cyano-phenyl)-3-cyclopentyl-propιonιc acid (36.0 mg, 58.6%) as a white solid: mp 126-128°C; EI-HRMS m/e calcd for C15H17NO2 (M 243.1259 found 243.1268.
A solution of 2-(4-cyano-phenyl)-3-cyclopentyl-propιonιc acid (33.0 mg, 0.13 mmol) in methylene chloπde (1.36 mL) was cooled to 0°C and then treated with a 2.0M solution of oxalyl chloπde in methylene chloπde (0.07 mL, 0.14 mmol) and a few drops of N,N- dimethylformamide. The reaction mixture was stirred at 0°C for 10 mm and at 25°C for 30 min. The reaction mixture was then treated with a solution of 2-aminothiazole (30.0 mg, 0.29 mmol) and N,N-diisopropylethylamine (0.05 mL, 0.32 mmol) in tetrahydrofuran (0.67 mL). This solution was stirred at 25°C for 3 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 2-(4-cyano-phenyl)-3-cyclopentyl-Ν-thiazol-2-yl- propionamide (44.1 mg, 100%) as a white solid: mp 64-66°C; EI-HRMS m/e calcd for C,8H19N3OS (M +) 325.1248 found 325.1247.
(B) In an analogous manner, there was obtained: (a) From 2-aminopyridine and 2-(4-cyano-phenyl)-3-cyclopentyl -propionic acid: 2-(4- Cyano-phenyl)-3-cyclopentyl-N-pyridin-2-yl-propionamide as a white solid: mp 61-63°C; EI-HRMS m/e calcd for C20H21N3O (M*) 319.1684, found 319.1697.
(b) From 2-(4-cyano-phenyl)-3-cyclopentyl-propionic acid and 6-amino-nicotinic acid methyl ester: 6-[2-(4-Cyano-phenyl)-3-cyclopentyl-propionylamino]-nicotinic acid methyl ester as a white solid: mp 62-64°C; EI-HRMS m/e calcd for C22H23N3O3 (M+) 377.1739, found 377.1736.
Example 87 (A) 3-Cyclopentyl-N-pyridin-2-yl-2-(4-trifluoromethyI-phenyl)-propionamide
Figure imgf000190_0001
A solution of freshly prepared lithium dusopropylamide (23 mL of a 0.3 IM stock solution, 7.13 mmol) cooled to -78°C was treated with (4-trifluoromethyl)phenylacetic acid (693 mg, 3.4 mmol) in tetrahydrofuran/ hexamethylphosphoramide (8.5 mL, 3:1). The resulting solution was stiπed at -78°C for 30 min. lodomethylcyclopentane (784 mg, 3.7 mmol) was then added in hexamethylphosphoramide (1 mL). The reaction mixture was stiπed at -78°C for 4 h. The reaction was then warmed to 25 °C and was stiπed at 25 °C for 16 h. The reaction mixture was then quenched by the dropwise addition of saturated aqueous ammonium chloride solution (10 mL). The excess solvent was removed in vacuo. The residue was acidified to pH = 1 with a IN aqueous hydrochloric acid solution. The mixture was poured into water (150 mL) and extracted with ethyl acetate (3 x 100 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 95/5 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-trifluoromethyl-phenyl)-propionic acid (634.9 mg, 65%) as a white solid: mp 94-95°C; FAB-HRMS m/e calcd for C15H17F3O2 (M+Na)+ 309.1079, found 309.1072.
A solution of benzotriazol-l-yloxy-tris(dimethylamino)phosphonium hexafluorophosphate (170 mg, 0.38 mmol), 3-cyclopentyl-2-(4-trifluoromethyl-phenyl)- propionic acid (100 mg, 0.34 mmol), and 2-aminopyridine (36 mg, 0.38 mmol) in N,N- dimethylformamide (1.75 mL) was treated with N,N-diisopropylethylamine (0.12 mL, 0.73 mmol). The reaction mixture was stiπed at 25°C for 18 h . At this time, the reaction was poured into water (50 mL) and extracted with ethyl acetate (3 x 50 mL). The combined organic layers were washed with a IN aqueous hydrochloric acid solution (1 x 50 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded 3-cyclopentyl-Ν-pyridin-2-yl-2-(4-trifluoromethyl-phenyl)-propionamide (127 mg, 53.3%) as a white gum: EI-HRMS m/e calcd for C20H2ιF3N2O (M+) 362.1605, found 362.1592.
(B) In an analogous manner, there was obtained:
(a) From 6-amino-nicotinic acid methyl ester and 3-cyclopentyl-2-(4-trifluoromethyl- phenyl)-propionic: 6-[3-Cyclopentyl-2-(4-trifluoromethyl-phenyl)-propionylamino]- nicotinic acid methyl ester as a white gum: EI-HRMS m/e calcd for C 2H23F3N2O3 (M+) 420.1660, found 420.1661.
Example 88 (A) 2-[4-(Butane-l-sulfonyl)-phenyl]-3-cyclopentyl-N-thiazol-2-yl-propionamide
Figure imgf000192_0001
A solution of freshly prepared lithium dusopropylamide (430.55 mL of a 0.3M stock solution, 129.16 mmol) cooled to -78°C was treated with (4-nitro-phenyl)-acetic acid ethyl ester (prepared in Example 22, 26.32 g, 125.83 mmol) in tetrahydrofuran/hexamethylphosphoramide (312.5 mL, 3:1). The resulting solution was stirred at -78°C for 45 min. lodomethylcyclopentane (27.75 g, 132.1 mmol) was then added in hexamethylphosphoramide (27.75 mL). The mixture was stiπed at -78°C for 4 h. The reaction was then warmed to 25°C and was stiπed at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (250 mL). This mixture was concentrated in vacuo. The residue was diluted with water (250 mL) and extracted with ethyl acetate (3 x 300 mL). The organics were washed with a saturated aqueous lithium chloride solution (2 x 250 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 98/2 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- nitro-phenyl)-propionic acid ethyl ester (28.30 g, 77.2%) as a yellow oil: EI-HRMS m/e calcd for C16H21NO4 (M+) 291.1470, found 291.1470.
A solution of 3-cyclopentyl-2-(4-nitro-phenyl)-propionic acid ethyl ester (7.37 g, 25.3 mmol) in ethyl acetate (316 mL) was treated with 10% palladium on activated carbon. The reaction mixture was stiπed under hydrogen gas at 60 psi at 25°C for 18 h. The catalyst was then filtered off through a pad of celite (ethyl acetate). The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 2-(4-amino-phenyl)-3-cyclopentyl-propionic acid ethyl ester (3.52 mg, 53.3%) as a yellow oil: EI-HRMS m/e calcd for d6H23NO2 (M+) 261.1729 found 261.1727.
A mixture of concentrated hydrochloric acid (0.38 mL) and ice (380 mg) cooled to 0°C was treated with 2-(4-amino-phenyl)-3-cyclopentyl-propionic acid ethyl ester (497 mg, 1.90 mmol). After 5 min, a solution of sodium nitrite (139 mg, 2.01 mmol) in water (0.31 mL) was added to the reaction mixture. The resulting solution was stiπed at 0°C for 5 min. At this time, the solution was added to a solution of n-butyl mercaptan (0.23 mL, 2.20 mmol) in water (0.41 mL) warmed to 45°C. The reaction was stiπed at 45°C for 3 h. At this time, the reaction was diluted with water (50 mL) and extracted with chloroform (3 x 50 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. The crude brown oil (588 mg) in methylene chloride (8.8 mL) was cooled to 0°C and treated with 3-chloroperoxybenzoic acid (80-85% grade, 1.5 g, 8.78 mmol). The reaction mixture was stirred at 25°C for 18 h. At this time, the reaction was diluted with water (75 mL) and extracted with chloroform (2 x 30 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 2-[4-(butane-l-sulfonyl)-phenyl]-3-cyclopentyl-propionic acid ethyl ester (144.3 mg, 20.7%) as a yellow oil: EI-HRMS m/e calcd for C20H30O4S (M+) 366.1865 found 366.1858.
A solution of 2-[4-(butane-l-sulfonyl)-phenyl]-3-cyclopentyl-propionic acid ethyl ester (140 mg, 0.38 mmol in tetrahydrofuran/water/methanol (0.95 mL, 3: 1:1) was treated with a IN aqueous lithium hydroxide solution (0.76 mL, 0.76 mmol). The reaction was stirred at 25°C for 8 h. At this time, the reaction was acidified to pH = 1 with a IN aqueous hydrochloric acid solution and extracted with chloroform (3 x 50 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 chloroform/methanol) afforded 2-[4-(butane- l-sulfonyl)-phenyl]-3-cyclopentyl-propionic acid (88.3 mg, 68.4%) as a clear oil: FAB- HRMS m/e calcd for C18H26O4S (M+H)+ 339.1631 found 339.1638.
A solution of triphenylphosphine (99 mg, 0.37 mmol) and N-bromosuccinimide (76 mg, 0.42 mmol) in methylene chloride (1.26 mL) cooled to 0°C was treated with 2-[4- (butane-l-sulfonyl)-phenyl]-3-cyclopentyl-propionic acid (85 mg, 0.25 mmol) in methylene chloride. The reaction mixture was stiπed at 25°C for 45 min. At this time, the reaction was treated with 2-aminothiazole (33 mg, 0.32 mmol) and pyridine (0.03 mL, 0.37 mmol). The reaction was stiπed at 25°C for 18 h. The reaction mixture was then concentrated in vacuo to remove methylene chloride. At this time, the reaction was diluted with water (50 mL) and extracted with chloroform (3 x 50 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 50/50 hexanes/ethyl acetate) afforded 2-[4-(butane-l-sulfonyl)-phenyl]-3-cyclopentyl-Ν-thiazol-2-yl-propionamide (69.3 mg, 65.6%) as an off-white solid: mp 163-165°C; EI-HRMS m/e calcd for C^HjgN^Sj (M+) 420.1541 found 420.1535.
(B) In an analogous manner, there was obtained:
(a) From 2-aminothiazole and 3-cyclopentyl-2-[4-(propane-l-sulfonyl)-phenyl]-propionic acid: 3-Cyclopentyl-2-[4-(propane-l-sulfonyl)-phenyl]-N-thiazol-2-yl-propionamide as a yellow oil: EI-HRMS m/e calcd for C20H26N2O3S2 (JVT) 406.1385 found 406.1389. Example 89
(A) 3-Cyclopentyl-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-thiazol-2-yl- propionamide
Figure imgf000195_0001
A solution of freshly prepared lithium dusopropylamide (35.32 mL of a 0.3 IM stock solution, 10.95 mmol) cooled to -78°C was treated with (4-fluoro-3-tnfluoromethyl- phenyl)-acetιc acid (1.11 g, 5.0 mmol) in tetrahydrofuran/l,3-dιmethyl-3,4,5,6-tetrahydro- 2(lH)-pynmιdιnone (12.42 mL, 3.1). The resulting solution was stirred at -78°C for 1 h lodomethylcyclopentane (1.16 g, 5.52 mmol) was then added in l,3-dιmethyl-3,4,5,6- tetrahydro-2(lH)-pynmιdmone (1.2 mL). The reaction mixture was stiπed at -78°C for 4 h. The reaction was then warmed to 25°C and was stiπed at 25°C for 24 h. This solution was then quenched by the slow addition of the reaction mixture to a 2N aqueous hydrochlonc acid solution (50 mL). The product was extracted into ethyl acetate (1 x 300 mL) and diethyl ether (1 x 50 mL). The organics were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-fluoro-3-tπfluoromethyl- phenyl)-propιonιc acid (1.28 g, 84.3%) as a white solid: mp 65-68°C; EI-HRMS m/e calcd for C15H16F4O2 (M+ ) 305.1165, found 305.1174.
A solution of 3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)-propιomc acid (304 mg, 1.0 mmol) in methylene chloπde (10 mL) was cooled to 0°C and then treated with a 2.0M solution of oxalyl chlonde in methylene chlonde (0.6 mL, 1.2 mmol) and a few drops of N,N-dimethylformarmde. The reaction mixture was stirred at 0°C for 15 mm and at 25°C for 24 h. The reaction mixture was then treated with 2-ammo-thιazole (175 mg, 1.75 mmol) and N,N-diisopropylethylamine (0.4 mL, 2.41 mmol). This solution was stiπed at 25°C for 48 h. At this time, the reaction was concentrated in vacuo. High pressure liquid chromatography (Chromegasphere SI-60, 10 μM, 60A, 25cm x 23cm ID, 60/40 heptane/ethyl acetate) afforded 3-cyclopentyl-2-(4-fluoro-3-trifluoromethyl- phenyl)-Ν-thiazol-2-yl-propionamide (326 mg, 84.5%) as a light yellow solid: mp 125- 127°C; EI-HRMS m/e calcd for Cι8H18F4N2OS (M+) 386.1076, found 386.1086.
(B) In an analogous manner, there was obtained:
(a) From ethyl 2-amino-4-thiazole glyoxylate and 3-cyclopentyl-2-(4-fluoro-3- trifluoromethyl-phenyl)-propionic acid: {2-[3-Cyclopentyl-2-(4-fluoro-3-trifluoromethyl- phenyl)-propionylamino]-thiazol-4-yl}-oxo-acetic acid ethyl ester as a light yellow solid: mp 155-158°C; FAB-HRMS m/e calcd for C22H22F4N2O4S (M+H)+ 487.1314, found 487.1319.
(b) From 5-methyl-2-aminopyridine and 3-cyclopentyl-2-(4-fluoro-3-trifluoromethyl- phenyl)-propionic acid: 3-Cyclopentyl-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-(5- methyl-pyridin-2-yl)-propionamide as a white solid: mp 132-133°C; EI-HRMS m/e calcd for C21H22F4N2O (M+) 392.1668, found 392.1669.
(c) From 2-aminopyridine and 3-cyclopentyl-2-(4-fluoro-3-trifluoromethyl-phenyl)- propionic acid: 3-Cyclopentyl-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-pyridin-2-yl- propionamide as a light yellow oil: EI-HRMS m/e calcd for C20H20F N2O (M+) 380.1511, found 380.1521.
Example 90 3-Cyclopentyl-N-thiazol-2-yl-2-(3-trifluoromethyl-phenyl)-propionamide
Figure imgf000197_0001
A solution of freshly prepared lithium dusopropylamide (35.32 mL of a 0.3 IM stock solution, 10 9 mmol) cooled to -78°C was treated with (3-tnfluoromethyl-phenyl)-acetιc acid (1.02 g, 5.0 mmol) tetrahydrofuran/l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)- pyπmidinone (12 4 mL, 3.1) The resulting solution was stirred at -78°C for 3 h lodomethylcyclopentane (1.16 g, 5.52 mmol) was then added m 1, 3-dιmethyl-3, 4,5,6- tetrahydro-2(lH)-pynmιdmone (1.16 mL) The reaction mixture was stirred at -78°C for 4 h The reaction was then warmed to 25°C and was stiπed at 25°C for 48 h This solution was then quenched by the slow addition of the reaction mixture to a 2N aqueous hydrochlonc acid solution (50 mL) The product was extracted into ethyl acetate (3 x 100 mL) and diethyl ether (1 x 50 mL) The organics were washed with a saturated aqueous lithium chlonde solution (2 x 100 mL) and a saturated aqueous sodium chlonde solution (1 x 150 mL), dπed over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate with acetic acid) afforded 3-cyclopentyl-2-(3-tπfluoromethyl- phenyl)-propιonιc acid (1.16 g, 80.5%) as an off-white solid: mp 64-65°C; EI-HRMS m/e calcd for Cι5H17F3O2 (M+ Na+) 309.1079, found 309.1084.
A solution of 3-cyclopentyl-2-(3-tnfluoromethyl-phenyl)-propιonιc acid (286 mg, 1.0 mmol) in methylene chlonde (10 mL) was cooled to 0°C and then treated with a 2.0M solution of oxalyl chlonde in methylene chloπde (0.6 mL, 1.2 mmol) and a few drops of N,N-dιmethylformamιde. The reaction mixture was stirred at 0°C for 15 m and at 25°C for 1.25 h. The reaction mixture was then treated with a solution of 2-aminothiazole (175 mg, 1.75 mmol) and N,N-diisopropylethylamine (0.42 mL, 2.41mmol) in tetrahydrofuran (10 mL). This solution was stirred at 25°C for 24 h. At this time, the reaction was concentrated in vacuo. High pressure liquid chromatography (Chromegasphere SI-60, 10 μM, 60A, 25cm x 23cm ID, 60/40 heptane/ethyl acetate) afforded 3-cyclopentyl-Ν- thiazol-2-yl-2-(3-trifluoromethyl-phenyl)-propionamide (299.2 mg, 81.4%) as a light yellow solid: mp 134-136°C; EI-HRMS m/e calcd for C18Hι9F3N2OS (M+) 368.1170, found 368.1165.
Example 91
(A) 3-Cyclopentyl-2-(4-methanesulfonyI-3-trifluoromethyl-phenyl)-N-thiazoI-2-yl- propionamide
Figure imgf000198_0001
A solution of freshly prepared lithium dusopropylamide (35.3 mL of a 0.3 IM stock solution, 10.9 mmol) cooled to -78°C was treated with (4-fluoro-3-trifluoromethyl- phenyl)-acetic acid (1.11 g, 5.0 mmol) in tetrahydrofuran/l,3-dimethyl-3,4,5,6-tetrahydro- 2(lH)-pyrimidinone (12.4 mL, 3:1). The resulting solution was stirred at -78°C for 1 h. At this time, the reaction was treated with a solution of iodomethylcyclopentane (1.16 g, 5.52 mmol) in l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (1.2 mL). The reaction mixture was stirred at -78°C for 4 h. The reaction was then warmed to 25°C and was stiπed at 25°C for 48 h. This solution was then quenched by the slow addition of the reaction mixture to a 2N aqueous hydrochloric acid solution (50 mL). The product was extracted into ethyl acetate (3 x 100 mL) and diethyl ether (1 x 50 mL). The organics were dried over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate with acetic acid) afforded 3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)- propiomc acid (1.28 g, 84.3%) as a white solid- mp 66-68°C; EI-HRMS m/e calcd for Cι5Hι6F4O2 (M+) 305.1165, found 305.1174
A solution of 3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)-propιonιc acid (7.77 g, 25.3 mmol) in methanol (50 mL) was treated slowly with concentrated sulfuπc acid (0.01 mL). The resultmg reaction mixture was heated under reflux for 24 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo. The residue was dissolved in ethyl acetate (75 mL) and washed with a saturated aqueous sodium bicarbonate solution (1 x 50 mL), water (1 x 50 mL), and a saturated aqueous sodium chloπde solution (4 x 50 mL). The organics were dπed over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2-(4-fluoro-3- tnfluoromethyl-phenyl)-propιonιc acid methyl ester (8.48 g, 87.5%) as yellow oil: EI- HRMS m/e calcd for d6Hι8F4O2 (M+) 318.1243, found 318.1240.
A solution of 3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)-propιomc acid methyl ester (7 0 g, 21.9 mmol) in N,N-dιmethylformamιde (50 mL) was treated with sodium methanethiolate (2.61 g, 33.0 mmol). The reaction mixture was then heated at 100-110°C for 24 h. At this time, the reaction was poured onto a mixture of ice and a 2Ν aqueous hydrochlonc acid solution (100 mL). This mixture was extracted into ethyl acetate (3 x 75 mL) and diethyl ether (1 x 50 mL). The organics were then washed with water (1 x 75 mL) and a saturated aqueous sodium chlonde solution (3 x 100 mL). The organics were dned over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 85/15 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methylsulfanyl-3-trifluoromethyl-phenyl)-propιomc acid methyl ester (2.48g, 35.5%) as a pale yellow oil: EI-HRMS m/e calcd for C17H2ιF3O2S (M+) 346.1214 , found 346.1212. A solution of 3-cyclopentyl-2-(4-methylsulfanyl-3-trifluoromethyl-phenyl)-propιonic acid methyl ester (2.36 g, 6.81 mmol) methylene chloπde (75 mL) at 25°C was treated with 3 -chloroperoxybenzoic acid (80-85% grade, 9.69 g, 40.1 mmol). The reaction mixture was stiπed at 25°C for 16 h. At this time, the reaction was diluted with methylene chloπde (75 mL) The solution was washed with a saturated aqueous sodium bisulfite solution (2 x 50 mL), water (1 x 50 mL), a saturated aqueous sodium chloπde solution (3 x 75 mL), a saturated aqueous sodium bicarbonate solution (1 x 75 mL), and a saturated aqueous sodium chlonde solution (3 x 75 mL). The organics were dπed over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2- (4-methanesulfonyl-3-tnfluoromethyl-phenyl)-propιonιc acid methyl ester (2.88 g) as a clear oil. EI-HRMS m/e calcd for CπH2ιF3O4S (M+) 378.1112 found 3-78.1116.
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-tπfluoromethyl-phenyl)-propιonιc acid methyl ester (395mg, 1.04 mmol) and 2-amιnothιazole (209 mg, 1.38 mmol) in a solution of magnesium methoxide in methanol (7.4 wt%, 2.09 mL, 1.38 mmol) was heated at 110°C for 24 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded the 3-cyclopentyl-2-(4-methanesulfonyl-3-trifluoromethyl-phenyl)-N-thιazol-2- yl-propionamide (256.7 mg, 55.1%) as a white solid: mp 95-100°C; EI-HRMS m/e calcd for Cι9H2iF3N2O3S2 (M+)446.0946, found 446.0944.
(B) In an analogous manner, there was obtained:
(a) From (2-ammo-thιazol-4-yl)-acetιc acid methyl ester and 3-cyclopentyl-2-(4- methanesulfonyl-3-tnfluoromethyl-phenyl)-propionιc acid: { 2-[3-Cyclopentyl-2-(4- methanesulfonyl-3-tnfluoromethyl-phenyl)-propιonylammo]-thιazol-4-yl }-acetιc acid methyl ester as a white solid: mp 81-86°C; FAB-HRMS m/e calcd for C22H25F3N2O5S2 (M+H)+ 518.1157, found 518.1161. (b) From 2-amino-thiazole-4-carboxylic acid methyl ester and 3-cyclopentyl-2-(4- methanesulfonyl-3-trifluoromethyl-phenyl)-propionic acid: 2-[3-Cyclopentyl-2-(4- methanesulfonyl-3-trifluoromethyl-phenyl)-propionylamino]-thiazole-4-carboxylic acid methyl ester as a white solid: mp 117-121°C; FAB-HRMS m/e calcd for C2iH23F3N2O5S2 (M+H)+ 504.1000, found 504.1000.
Example 92
3-CyclopentyI-2-(4-methanesulfonyl-3-trifluoromethyl-phenyl)-N-pyridin-2-yl- propionamide
Figure imgf000201_0001
A solution of freshly prepared lithium dusopropylamide (141.28 mL of a 0.31M stock solution, 43.8 mmol) cooled to -78°C was treated with (4-fluoro-3-trifluoromethyl- phenyl)-acetic acid (4.44 g, 20.0 mmol) in tetrahydrofuran/l,3-dimethyl-3,4,5,6- tetrahydro-2(lH)-pyrimidinone (49.68 mL, 3: 1). The resulting solution was stiπed at - 78°C for 1 h. At this time, the reaction was treated with a solution of iodomethylcyclopentane (4.64 g, 22.09 mmol) in l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyrimidinone (4.6 mL). The reaction mixture was stiπed at -78°C for 4 h. The reaction was then warmed to 25°C and was stirred at 25°C for 48 h. This solution was then quenched by the slow addition of the reaction mixture to a 2N aqueous hydrochloric acid solution. The product was extracted into ethyl acetate (3 x 400 mL) and diethyl ether (1 x 200 mL). The organics were dried over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate with acetic acid) afforded 3-cyclopentyl-2-(4-fluoro-3- trifluoromethyl-phenyl)-propionic acid (3.37 g, 55.4%) as a white solid: mp 66-68°C; EI- HRMS m/e calcd for Cι5Hι6F4O2 (M+) 305.1165, found 305.1174.
A solution of 3-cyclopentyl-2-(4-fluoro-3-trifluoromethyl-phenyl)-propionic acid (1.52 g, 5.0 mmol) in N,N-dimethylformamide (lOmL) was treated with sodium methanethiolate (0.59 g, 7.5 mmol). The reaction mixture was then heated to 100-110°C for 14 h. At this time, the reaction was poured onto a mixture of ice and a 2Ν aqueous hydrochloric acid solution (25 mL). This mixture was extracted into ethyl acetate (3 x 35 mL) and diethyl ether (1 x 25 mL). The organics were then washed with water (1 x 50 mL) and a saturated aqueous sodium chloride solution (3 x 75 mL). The organics were dried over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate w/acetic acid) afforded 3-cyclopentyl-2-(4-methylsulfanyl-3-trifluoromethyl-phenyl)- propionic acid (1.36 g, 83.4%) as a pale yellow oil: EI-HRMS m/e calcd for Cι6Hι9F3O2S (M+) 332.1058, found 332.1057.
A solution of 3-cyclopentyl-2-(4-methylsulfanyl-3-trifluoromethyl-phenyl)-propionic acid (1.29 g, 3.89 mmol) in ethanol (25 mL) was treated slowly with concentrated sulfuric acid (0.01 mL). The resulting reaction mixture was heated under reflux for 48 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo. The residue was dissolved in ethyl acetate (35 mL) and washed with a saturated aqueous sodium bicarbonate solution (1 x 15 mL), water (1 x 15 mL), and a saturated aqueous sodium chloride solution (3 x 20 mL). The organics were dried over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2-(4- methylsulfanyl-3-trifluoromethyl-phenyl)-propionic acid ethyl ester (1.39 g, 94.8%) as yellow oil: EI-HRMS m/e calcd for C18H23F3O2S (M+) 360.1370, found 360.1370.
A solution of 3-cyclopentyl-2-(4-methylsulfanyl-3-trifluoromethyl-phenyl)-propionic acid ethyl ester (1.32 g, 3.69 mmol) in methylene chloride (50 mL) at 25°C was treated with 3- chloroperoxybenzoic acid (80-85% grade, 4.8 g, 19.8 mmol). The reaction mixture was stiπed at 25°C for 4 d. At this time, the reaction was diluted with methylene chloride (25 mL). This solution was washed with a saturated aqueous sodium bisulfite solution (1 x 50 mL), water (1 x 50 mL), a saturated aqueous sodium bicarbonate solution (1 x 50 mL), water (1 x 50 mL), and a saturated aqueous sodium chloride solution (3 x 50mL). The organics were dried over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate with acetic acid) afforded 3-cyclopentyl-2-(4-methanesulfonyl-3- trifluoromethyl-phenyl)-propionic acid ethyl ester (1.28 g, 89.0%) as a clear oil: EI- HRMS m/e calcd for Cι8H23F3O4S (M+) 392.1269 found 392.1268.
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-trifluoromethyl-phenyl)-propionic acid ethyl ester (707mg, 1.80 mmol in tetrahydrofuran/water (24 mL, 3:1) was treated with lithium hydroxide (166 mg, 3.97 mmol). The reaction was stirred at 25°C for 24 h. At this time, the reaction concentrated in vacuo. The residue was diluted with water (25 mL) and extracted with diethyl ether (1 x 15 mL). The aqueous layer was acidified to pH = 1 with a 2N aqueous hydrochloric acid solution, and extracted with chloroform (3 x 25 mL). The organics were washed with water (1 x 25 mL), a saturated aqueous sodium chloride solution (3 x 25 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2-(4-methanesulfonyl-3-trifluoromethyl-phenyl)-propionic acid (426.7 mg, 65%) as a white solid: mp 122-123°C; EI-HRMS m/e calcd for CI6H19F3O4S (M+) 364.0956 found 364.0956.
A solution of and 3-cyclopentyl-2-(4-methanesulfonyl-3-trifluoromethyl-phenyl)- propionic acid (73 mg, 0.2 mmol) and triphenylphosphine (79 mg, 0.3 mmol) in methylene chloride (5.0 mL) was cooled to 0°C and then treated with N- bromosuccinimide (60.5 mg, 0.34 mmol). After the complete addition of N- bromosuccinimide, the reaction mixture was allowed to warm to 25 °C over 30 min. The reaction mixture was then treated with 2-aminopyridine (28.2 mg, 0.3mmol) and pyridine (1 drop) The resultmg reaction mixture was stirred at 25°C for 48 h The reaction mixture was then diluted with methylene chloπde (50 mL) The organic layer was washed with water (1 x 50 mL) and a saturated aqueous sodium chloπde solution (2 x 25 mL), dπed over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo High pressure liquid chromatography (Chromegasphere SI-60, 10 μM, 60A, 25cm x 23cm ID, 50/50 heptane/ethyl acetate) afforded 3-cyclopentyl-2-(4-methanesulfonyl-3- tπfluoromethyl-phenyl)-N-pyndm-2-yl-propιonamιde (54 2 mg, 61.5%) as a white solid mp 86-89°C, EI-HRMS m/e calcd for C2ιH23F3N2O3S (M+) 440 1383, found 440 1381
Example 93
3-Cyclopentyl-2-(4-methylsulfanyl-3-trifluoromethyl-phenyl)-N-thiazol-2-yl- propionamide
Figure imgf000204_0001
A solution of 3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)-propιonιc acid (prepared in Example 89, 1.52 g, 5 0 mmol) in N,N-dιmethylformamιde (10 mL) was treated with sodium methanethiolate (593 mg, 7 5 mmol) The reaction mixture was then heated to 100-110°C for 14 h At this time, the reaction was cooled to 25°C and poured onto a IN aqueous hydrochlonc acid solution (25 mL) and extracted into ethyl acetate (3 x 25 mL) and diethyl ether (1 x 25 mL) The organics were then washed with water (1 x 50 mL) and a saturated aqueous sodium chloπde solution (3 x 75 mL), dπed over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methylsulfanyl-3-tnfluoromethyl-phenyl)-propιonιc acid (1 37 g, 82 4%) as a pale yellow oil EI-HRMS m/e calcd for d6H19F3O2S (M+) 332 1058, found 332 1057 A solution of benzotnazol-l-yloxy-tπs(dιmethylammo)phosphonιum hexafluorophosphate (188 mg, 0.42 mmol) and 3-cyclopentyl-2-(4-methylsulfanyl-3- tπfluoromethyl-phenyl)-propιomc acid (94 mg, 0.28 mmol) in N,N-dιmethylformamιde (5 mL) was treated with N,N-diisopropylethylamine (150 μL, 0.85 mmol) and 2- aminothiazole (42.5 mg, 0.42 mmol) The mixture was stirred at 25°C for 48 h. At this time, the reaction mixture was poured into cold water (25 mL) containing a IN aqueous hydrochlonc acid solution (50 mL) and extracted into ethyl acetate (2 x 75 mL) and diethyl ether (1 x 25 mL) The organics were then washed with water (2 x 75 mL) and a saturated aqueous sodium chlonde solution (3 x 75 mL), dned over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methylsulfanyl-3-tπfluoromethyl-phenyl)-Ν-thιazol-2-yl-propιonamιde (50.5 mg, 43.1%) as a clear oil: FAB-HRMS m/e calcd for Cι9H2ιF3N2OS2 (M+H)+ 415.1125, found 415.1123
Example 94 2-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyridin-2-yl-propionamide
Figure imgf000205_0001
A solution of aluminum tnchlonde (34.8 g, 261.4 mmol) in chloroform (120 mL) under argon and cooled to 0°C and was then treated dropwise with a solution of ethyl chlorooxoacetate (18.7 mL, 167.5 mmol) m chloroform (120 mL). The mixture was then stiπed at 0°C for 30 m . After this time a solution of 2-chlorothιoamsole (25.0 g, 156.5 mmol) in chloroform (120 mL) was added dropwise to the above mixture at 0°C and it tuπied red in color. It was allowed to warm to 25°C and stirred for an additional 3.5 h. The reaction was quenched by slowly adding water (500 mL). The solution turned yellow in color and was then transfeπed to a separatory funnel and extracted with chloroform (3 x 50 mL). The organic phase was dried over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded (3-chloro-4-methylsulfanyl-phenyl)-oxo-acetic acid ethyl ester (31.37 g, 77%) as a yellow oil.
A solution of cylcopenytlmethyl triphenylphosphine iodide (725 mg, 1.53 mmol) in tetrahydrofuran (10 mL) was cooled to 0°C. To this cooled solution was added sodium bis(trimethylsilyl)amide (1.0 M in THF, 2.14 mL, 2.14 mmol) and the reaction turned red in color. It was stiπed at 0°C for 45 minutes and then a solution of (3-chloro-4- methylsulfanyl-phenyl)-oxo-acetic acid ethyl ester (355 mg, 1.37 mmol) in tetrahydrofuran (5 mL) was added slowly. The reaction was warmed to 25°C and stiπed for 20 h. The reaction was diluted with water (50 mL) and transfeπed to a separatory funnel and extracted with diethyl ether ( 3 x 25 mL). The organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. Chromatography (Biotage Flash 12M column, 80/20 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methylsulfanyl-phenyl)-3- cyclopentyl-acrylic acid ethyl ester (267 mg, 60%, mixture of E and Z isomers (2:1)) as a yellow oil and taken on without characterization.
A solution of E and Z 2-(3-chloro-4-methylsulfanyl-phenyl)-3-cyclopentyl-acrylic acid ethyl ester (100 mg, 0.31 mmol) dissolved in methylene chloride (5 mL) cooled to 0°C was treated with 3-chloroperoxybenzoic acid (80%, 157 mg, 0.729 mmol) and stiπed for 3.5 h. The reaction mixture was diluted with methylene chloride (25 mL), transfeπed to a separatory funnel and washed with saturated aqueous sodium carbonate solution (2 x 10 mL) and brine (2 x lOmL). The organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. Chromatography (Biotage Flash 12M column, 80/20 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- acryhc acid ethyl ester (95 mg, 86%, mixture of E and Z isomers (2:1)) as a colorless oil and taken on without charactenzation.
The mixture of E and Z isomers of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- acrylic acid ethyl ester (1.04 g, 2.91 mmol), nickel chlonde hexahydrate (69 mg, 0.29 mmol) and methanol (25 mL) were placed m a flask under argon. To this green solution was then added sodium borohydnde (221 mg, 5.83 mmol) slowly in small portions using an ice bath if necessary to keep the temperature at 20°C. The solution turned black and a fine precipitate formed after addition of the sodium borohydnde. This was then stiπed at 25°C for 1 5 h After such time the reaction was filtered through celite and washed with methanol. The filtrate and washings were combined and concentrated in vacuo to reduce the volume The residual solution was then diluted with water (15 mL) and extracted with ethyl acetate (3 x 15 mL) dπed over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded a mixture of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionic acid methyl ester and 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- propiomc acid ethyl ester (transestenfication occuπed under the reaction conditions) (937 mg) as a clear colorless oil. (It was earned on without charactenzation because it was a mixture of esters)
The mixture of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιomc acid methyl ester and 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid ethyl ester, from above, (937 mg) was dissolved m ethanol (30 mL) and allowed to dissolve. To this solution was then added a solution of potassium hydroxide (733 mg, 13.1 mmol) in water (7 mL). The yellow solution was then stirred for 3 h at 25°C. It was concentrated in vacuo to remove the ethanol and then IN hydrochlonc acid was added until the pH = 2. This was then extracted with methylene chlonde (3 X 15 mL). The organic layers were then dned over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate plus 1% acetic acid) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- propiomc acid (787 mg, 82% over two steps) as a white solid: mp: 123.9-126.2°C; FAB- HRMS m/e calcd for C15HI9O4SCl (M+H)+ 331.0771, found 331.0776.
Tnphenylphosphme (238 mg, 0.91 mmol) was dissolved in methylene chlonde (10 mL) and cooled to 0°C. To this solution was added N-bromosuccmimide (183 mg, 1.03 mmol) and was stirred at 0°C until it was completely dissolved and became light purple m color The 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (200 mg, 0.61 mmol) was then added and it was stiπed at 0°C for 20 mm and then warmed to 25°C and stirred for 30 mm After such time 2-amιnopyndme (85 mg, 0.91 mmol) and pyndme (0.088 mL, 1.09 mmol) were added and it was stiπed at 25°C for 16 h. The reaction was then diluted with water (10 mL) and then extracted with methylene chlonde (3 x 15 mL) The organic layers were then combined and dned over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 60/40 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3- cyclopentyl-N-pyndιn-2-yl-propιonamιde (210 mg, 85%) as a colorless oil: EI-HRMS m/e calcd for CJiJt SCl (JVT) 406.1118, found 406.1120
Example 95 N-(5-Bromo-pyridin-2-yI)-2-(3-chloro-4-methanesulfonyl-phenyI)-3-cyclopentyl- propionamide
Figure imgf000208_0001
A solution of tnphenylphosphme (238 mg, 0.91 mmol) in methylene chloride (10 mL) was cooled to 0°C and then treated with N-bromosuccmimide (183 mg, 1.03 mmol). The reaction mixture was stirred at 0°C until it was completely dissolved and became light purple in color. The reaction mixture was then treated with 2-(3-chloro-4- methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (prepared in Example 94, 200 mg, 0.61 mmol) and stiπed at 0°C for 20 min and then warmed to 25°C where it was stiπed for 30 min. After such time, the reaction mixture was treated with 2-amino-5- bromopyridine (157 mg, 0.91 mmol) and pyridine (0.088 mL, 1.09 mmol), and reaction mixture was stirred at 25°C for 16 h. The reaction was then diluted with water (10 mL) and then extracted with methylene chloride (3 x 15 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-(5-bromo-pyridin-2-yl)- propionamide (245 mg, 83%) as a white foam: EI-HRMS m/e calcd for C oH22Br ClN2O3S (M+) 484.0223, found 484.0222.
Example 96
N-(5-Chloro-pyridin-2-yl)-2-(3-chloro-4-methanesulfonyl-phenyl)-3-cydopentyI- propionamide
Figure imgf000209_0001
A solution of triphenylphosphine (238 mg, 0.91 mmol) in methylene chloride (10 mL) was cooled to 0°C and then treated with N-bromosuccinimide (183 mg, 1.03 mmol). The reaction mixture was stirred at 0°C until it was completely dissolved and became light purple in color. The reaction mixture was then treated with 2-(3-chloro-4- methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (prepared in Example 94, 200 mg, 0.61 mmol) and stiπed at 0°C for 20 min and then warmed to 25°C where it was stiπed for 30 mm After such time, the reaction mixture was treated with 2-amιno-5- chloropyπdine (117 mg, 0.91 mmol) and pyndme (0.088 mL, 1.09 mmol), and the reaction mixture was stiπed at 25°C for 16 h. The reaction was then diluted with water (10 mL) and then extracted with methylene chlonde (3 x 15 mL). The combined organic layers were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-(5-chloro-pyπdm-2-yl)- propionamide (110 mg, 41%) as a yellow foam: EI-HRMS m/e calcd for C2oH22 Cl2N2O3S (M+) 440.0728, found 440.0728
Example 97
2-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-(5-trifluoromethyl-pyridin-
2-yl)-propionamide
Figure imgf000210_0001
A solution of tnphenylphosphme (238 mg, 0.91 mmol) in methylene chlonde (10 mL) was cooled to 0°C and then treated with N-bromosuccmimide (183 mg, 1.03 mmol). The reaction mixture was stirred at 0°C until it was completely dissolved and became light purple m color The reaction mixture was then treated with 2-(3-chloro-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιomc acid (prepared in Example 94, 200 mg, 0.61 mmol) and stirred at 0°C for 20 mm and then warmed to 25°C where it was stirred for 30 mm. After such time, the reaction mixture was treated with 2-ammo-5- tnfluoromethyl-pyndine (147 mg, 0.91 mmol) and pyndme (0.088 mL, 1.09 mmol), and the reaction mixture was stiπed at 25°C for 16 h The reaction was then diluted with water (10 mL) and then extracted with methylene chloπde (3 x 15 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 60/40 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-(5- trifluoromethyl - pyridin-2-yl)-propionamide (122 mg, 43%) as a white foam: EI-HRMS m/e calcd for C20H22 ClF3N2O3S (M+) 474.0992, found 474.0990.
Example 98
{2-[2-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionylamino]-thiazol-
4-yl}-oxo-acetic acid ethyl ester
Figure imgf000211_0001
A solution of triphenylphosphine (238 mg, 0.91 mmol) in methylene chloride (10 mL) was cooled to 0°C and then treated with N-bromosuccinimide (183 mg, 1.03 mmol). The reaction mixture was stiπed at 0°C until it was completely dissolved and became light purple in color. The reaction mixture was then treated with 2-(3-chloro-4- methanesulfonyl-phenyl)-3-cyclopentyl -propionic acid (prepared in Example 94, 200 mg, 0.61 mmol) and stiπed at 0°C for 20 min and then warmed to 25°C where it was stirred for 30 min. After such time, the reaction mixture was treated with 2-(amino-thiazol-4- yl)-oxo-acetic acid ethyl ester (182 mg, 0.91 mmol) and pyridine (0.088 mL, 1.09 mmol), and the reaction mixture was stirred at 25°C for 16 h. The reaction was then diluted with water (10 mL) and then extracted with methylene chloride (3 x 15 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded {2-[2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionylamino]- thιazol-4-yl } -oxo-acetic acid ethyl ester (208 mg, 67%) as a clear colorless oil: EI-HRMS m/e calcd for C22H25ClN2O6S2 (M+) 513.0921, found 513.0919.
Example 99
2(R)-(3-Chloro-4-methanesuIfonyl-phenyl)-3-cyclopentyl-N-thiazol-2-yl- propionamide
Figure imgf000212_0001
A mixture of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (prepared in Example 94, 6.07 g, 18.35 mmol), (R)-(+)-4-benzyl-2-oxazolιdιnone (2.83 g, 15.96 mmol), and tπethylamine (6 68 mL, 47.71 mmol) in toluene (50 mL) was heated at 80°C under argon until a homogeneous solution was obtained. The reaction mixture was then treated with tπmethylacetyl chlonde (3.55 mL, 28 81 mmol) in toluene (10 mL), and the reaction became yellow in color and a precipitate formed The reaction mixture was then heated at 80°C for 36 h. The reaction was cooled to 25°C and then the toluene was removed in vacuo The residue was diluted with ethyl acetate (150 mL) The organic layer was washed with a IN aqueous hydrochlonc solution (1 x 100 mL), a 10% aqueous sodium carbonate solution (1 x 100 mL), and a saturated aqueous sodium chlonde solution (1 x 100 mL) The organic layer was then dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/5/5 methylene chlonde/hexanes/ethyl acetate) afforded (1) 4(R)-benzyl-3-[2(S)-(3- chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonyl]-oxazolιdm-2-one (2.08 g, 23%) as a white foam [α]23 589 = +10.4° (c=0.144, chloroform); FAB-HRMS m/e calcd for C25H28ClNO5S (M+H)+ 490.1455, found 490 1457 and (2) 4(R)-benzyl-3-[2(R)-(3- chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonyl]-oxazolιdιn-2-one (2.20 g, 25%) as a white foam- [α]23 589 = -93 9° (c=0.165, chloroform); FAB-HRMS m/e calcd for C25H28ClNO5S (M+H)+ 490.1455, found 490.1443.
A solution of lithium hydroxide (215 mg, 9.0 mmol) m water (2.8 mL) was treated with a 30% aqueous hydrogen peroxide solution (2.0 mL, 18 mmol) This freshly prepared lithium hydroperoxide solution was then cooled to 0°C and then slowly added to a cooled (0°C) solution of 4(R)-benzyl-3-[2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3- cyclopentyl-propιonyl]-oxazolιdιn-2-one (2.20 g, 4.5 mmol) m tetrahydrofuran (18 mL) and water (5.8 mL). After 1.5 h at 0°C, the reaction was quenched with a 1.5N aqueous sodium sulfite solution (25 mL) and was diluted with water (150 mL) The aqueous layer was extracted with diethyl ether (3 x 50 mL) The aqueous layer was then acidified with a IN aqueous hydrochlonc acid solution to pH = 2 and extracted with ethyl acetate (3 x 50 mL) The combined organic layers were dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate with 1% acetic acid) afforded 2(R)-(3-chloro-4-methanesulfonyl- phenyl)-3-cyclopentyl-propιonιc acid (1.26 g, 85%) as a white solid mp 106.1-108 8°C; [α]23 589 = -43 0° (c=0 172, chloroform); EI-HRMS m/e calcd for C15H19ClO4S (M+) 330.0692, found 330.0690
A solution of tnphenylphosphme (248 mg, 0.94 mmol) in methylene chloπde (9 mL) was cooled to 0°C and then treated with N-bromosuccmimide (190 mg, 1.07 mmol). The reaction mixture was stiπed at 0°C until it was completely dissolved and became light purple m color The reaction mixture was then treated with 2(R)-(3-chloro-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (208 mg, 0.63 mmol). The reaction mixture was stiπed at 0°C for 20 mm and then warmed to 25°C where it was stiπed for 30 mm After such time, the reaction mixture was treated with 2- aminothiazole (95 mg, 0 94 mmol) and pyπdine (0.092 mL, 1.13 mmol), and the reaction mixture was stirred at 25°C for 16 h The reaction was then diluted with water (10 mL) and then extracted with methylene chlonde (3 x 15 mL) The combined organic layers were dπed over sodium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 65/35 hexanes/ethyl acetate) afforded 2(R)-(3- chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde (210 mg, 81%) as a white foam- [α]23 589 = -54.3° (c=0.081, chloroform); EI-HRMS m/e calcd for C18H2iClN2O3S2 (M+) 412.0682. found 412.0679
Example 100
2(R)-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyridin-2-yl- propionamide
Figure imgf000214_0001
A solution of tnphenylphosphme (238 mg, 0 91 mmol) in methylene chlonde (10 mL) was cooled to 0°C and then treated with N-bromosuccmimide (183 mg, 1.03 mmol). The reaction mixture was stiπed at 0°C until it was completely dissolved and became light purple in color The reaction mixture was then treated with 2(R)-(3-chloro-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιomc acid (prepared in Example 99, 200 mg, 0.61 mmol). The reaction mixture was stirred at 0°C for 20 mm and then warmed to 25 °C where rt was stirred for 30 mm. After such time, the reaction mixture was treated with 2-amιnopyndme (85 mg, 0.91 mmol) and pyndme (0.088 mL, 1.09 mmol), and the reaction mixture was stirred at 25°C for 16 h. The reaction was then diluted with water (10 mL) and then extracted with methylene chlonde (3 x 15 mL) The combined organic layers were dned over sodium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 60/40 hexanes/ethyl acetate) afforded 2(R)-(3- chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-Ν-pyπdm-2-yl-propιonamιde (202 mg, 81.5%) as a white foam: [α]23 58 = -41.8° (c=0.098, chloroform); EI-HRMS m/e calcd for C2oH23ClN2O3S (M+) 406.1118, found 406.1119.
Example 101
N-(5-Bromo-pyridin-2-yl)-2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionamide
Figure imgf000215_0001
A solution of triphenylphosphine (238 mg, 0.91 mmol) in methylene chloride (10 mL) was cooled to 0°C and then treated with N-bromosuccinimide (183 mg, 1.03 mmol). The reaction mixture was stirred at 0°C until it was completely dissolved and became light purple in color. The reaction mixture was then treated with 2(R)-(3-chloro-4- methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (prepared in Example 99, 200 mg, 0.61 mmol). The reaction mixture was stiπed at 0°C for 20 min and then warmed to 25°C where it was stirred for 30 min. After such time, the reaction mixture was treated with 2-aminopyridine (85 mg, 0.91 mmol) and pyridine (0.088 mL, 1.09 mmol), and the reaction mixture was stiπed at 25 °C for 16 h. The reaction was then diluted with water (10 mL) and then extracted with methylene chloride (3 x 15 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 60/40 hexanes/ethyl acetate) afforded Ν-(5-bromo- pyridin-2-yl)-2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionamide (222 mg, 76%) as an off-white foam: [α]23 589 = -48.6° (c=0.105, chloroform); EI-HRMS m/e calcd for C20H22BrClN2O3S (M+) 484.0223, found 484.0223. Example 102 N-(5-Cyano-pyridin-2-yl)-3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide
Figure imgf000216_0001
A solution of nickel(II) bromide (253 mg, 1.16 mmol), triphenylphosphine (1.15g, 4.39 mmol), and zinc powder (113 mg, 1.73 mmol) in acetonitrile (11 mL) was stiπed under argon at 60°C for 1 h. The reaction turned dark brown in color. After such time, the reaction mixture was treated with sodium cyanide (578 mg, 11.8 mmol) and 2-amino-5- bromopyridine (2.00 g, 11.6 mmol), and the reaction mixture was stiπed at 60°C for 16 h. The reaction mixture was then cooled to 25°C, diluted with ethyl acetate (50 mL), and then filtered through celite. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 100% ethyl acetate) afforded 6-ammo-nicotinonitrile (577 mg, 42%) as a white solid: mp 156.8-158.5°C; EI-HRMS m/e calcd for C6H5N3 (M+) 119.0483, found 119.0480.
A solution of triphenylphosphine (1.23 g, 4.70 mmol) in methylene chloride (26 mL) was cooled to 0°C and then treated with N-bromosuccinimide (948 mg, 5.33 mmol). The reaction mixture was stirred at 0°C until it was completely dissolved and became light purple in color. The reaction mixture was then treated with 3-cyclopentyl-2-(3,4- dichloro-phenyl)-propionic acid (prepared in Example 38, 900 mg, 3.13 mmol). The reaction mixture was stirred at 0°C for 20 min and then warmed to 25°C where it stiπed for 30 min. After such time, the reaction mixture was treated with 6-amino- nicotinonitrile (560 mg, 4.70 mmol) and pyridine (0.46 mL, 5.64 mmol), and the reaction mixture was stirred at 25°C for 16 h. The reaction was then diluted with water (25 mL) and then extracted with methylene chloride (3 x 25 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 85/15 hexanes/ethyl acetate) afforded N-(5-cyano-pyridin-2-yl)-3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide (882 mg, 73%) as a pink foam: EI-HRMS m/e calcd for C20Hι9Cl2N3O (M j 387.0905, found 387.0905.
Example 103
3-Cyclopentyl-2(R)-(3,4-dichloro-phenyl)-N-(5-trifluoromethyl-pyridin-2-yl)- propionamide
Figure imgf000217_0001
A solution of 3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionic acid (prepared in Example 54, 200 mg, 0.69 mmol) in methylene chloride (10 mL) and one drop of N,N- dimethylformamide was cooled to 0°C and then treated with a 2.0M solution of oxalyl chloride in methylene chloride (0.42 mL, 0.84 mmol). Gas evolution began immediately. The reaction mixture was allowed to warm slowly to 25°C where it was stirred for 30 min. After this time, the reaction mixture was treated with a solution of N,N- diisopropylethylamine (0.24 mL, 1.39 mmol) and 5-trifluoromethyl-2-aminopyridine (150 mg, 0.905 mmol) in tetrahydrofuran (4 mL) in one portion. The resulting reaction mixture was stiπed for 16 h at 25°C. After such time, the reaction was diluted with water (15 mL) and was extracted with methylene chloride (3 x 15 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded the 3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-Ν-(5-trifluoromethyl-pyridin-2-yl)- propionamide (77 mg, 26%) as a white solid: mp 113.8-117.5°C; EI-HRMS m/e calcd for C20Hι9Cl2F3N2O (M+) 430.0826, found 430.0835.
Example 104 6-[3-Cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionylamino]-nicotinic acid
Figure imgf000218_0001
A solution of 6-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonylamιno]-nιcotιmc acid methyl ester (prepared in Example 45, 188 mg, 0.45 mmol) in tetrahydrofuran (3 mL) was treated with a 3N aqueous hydrochlonc acid solution (3 mL). The resultmg reaction mixture was heated under reflux at 60°C for 4 h. After such time, the reaction was cooled to 25°C, diluted with water (5 mL), and then extracted with ethyl acetate (3 x 20 mL). The combined organic layers were dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate with 1% acetic acid) afforded 6-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)- propιonylamιno]-nιcotmιc acid (8 mg, 4%) as a white solid: [α]23 589 = -41.4° (c=0.099, chloroform), FAB-HRMS m/e calcd for C2oH2oCl2N2O3 (M+H)+ 407.0930, found 407 0928
Example 105 6-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionylamino]-N-methyl-nicotinamide
Figure imgf000219_0001
A solution of 6-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonylamιno]-nιcotιmc acid (prepared in Example 46, 125 mg, 0.31 mmol), N,N-dnsopropylethylamme (0.10 mL, 0.61 mmol), and benzotnazol-l-yloxy-tns(dιmethylammo)phosphonιum hexafluorophosphate (142 mg, 0.32 mmol) in N,N-dιmethylformamιde (15 mL) at 25°C was treated dropwise with a 2.0M solution of methylamme in tetrahydrofuran (0.16 mL, 0.32 mmol). The resulting reaction mixture was stiπed at 25°C for 16 h. The reaction mixture was then diluted with water (10 mL) and extracted with ethyl acetate (3 x 10 mL) The combined organic layers were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 6-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)- propιonylamιno]-Ν-methyl-nιcotmamιde (83 mg, 64%) as white solid: mp 229.1- 231 7°C; FAB-HRMS m/e calcd for C21H23CI2N3O2 (M+H)+ 420.1245, found 420.1247.
Example 106 3-Cyclopentyl-2-(3,4-dichloro-phenyl)-N-pyrazin-2-yl-propionamide
Figure imgf000219_0002
A solution of 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιomc acid (prepared in Example 38, 100 mg, 0.35 mmol) in methylene chlonde (5 mL) and one drop of N,N- dimethylformamide was cooled to 0°C and then treated with a 2.0M solution of oxalyl chlonde in methylene chlonde (0.20 mL, 0.39 mmol). Gas evolution began immediately. The reaction mixture was stiπed for 30 mm at 0°C. After this time, the reaction mixture was treated with a solution of N,N-dnsopropylethylamme (0.15 mL, 0.84 mmol) and am opyrazine (69 mg, 0.73 mmol) in tetrahydrofuran (4 mL) in one portion. The resulting reaction mixture was stirred for 16 h at 25°C The reaction mixture was then diluted with water (10 mL) and extracted with methylene chlonde (3 x 15 mL). The combined organic layers were dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh. 90/10 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-Ν-pyrazm-2-yl-propιonamιde (38 mg, 30%) as a yellow solid: mp 46.5-51.3°C; EI-HRMS m/e calcd for C18H19Cl2N3O (M+) 363 0905, found 363.0907.
Example 107 N-(5-Bromo-pyridin-2-yl)-3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionamide
Figure imgf000220_0001
A solution of tnphenylphosphme (411 mg, 1.57 mmol) in methylene chlonde (15 mL) was cooled to 0°C and then treated with N-bromosuccinimide (316 mg, 1.78 mmol). The reaction mixture was stirred at 0°C until it was completely dissolved and became light purple in color. The reaction mixture was then treated with 3-cyclopentyl-2(R)-(3,4- dιchloro-phenyl)-propιonιc acid (prepared in Example 54, 300 mg, 1.05 mmol). The reaction mixture was stirred at 0°C for 20 mm and then warmed to 25°C where it was stirred for 30 min. After such time, the reaction mixture was treated with 2-amino-5- bromopyridine (271 mg, 1.57 mmol) and pyridine (0.15 mL, 1.88 mmol). The resulting reaction mixture was stiπed at 25°C for 16 h. The reaction was then diluted with water (10 mL) and extracted with methylene chloride (3 x 15 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded N-(5-bromo-pyridin-2-yl)-3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)- propionamide (448 mg, 97%) as a white solid: mp 107.3-109.9°C; [α]23 589 = -66.7° (c=0.084, chloroform); EI-HRMS m/e calcd for C]9Hι9BrCl2N2O (M+) 440.0058, found 440.0056.
Example 108
3-CyclopentyI-2(R)-(3,4-dichloro-phenyl)-N-(5-hydroxymethyI-pyridin-2-yl) propionamide
Figure imgf000221_0001
A solution of 6-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionylamino]-nicotinic acid methyl ester (prepared in Example 45, 398 mg, 0.95 mmol) in diethyl ether (30 mL) was cooled to 0°C and then treated with lithium aluminum hydride (54 mg, 1.4 mmol) in one portion. There was immediate gas evolution. The reaction mixture was allowed to slowly warm to 25°C and was stiπed at 25°C 16 h. After such time, the reaction mixture was diluted with water (10 mL) and then extracted with ethyl acetate (3 x 15 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(5-hydroxymethyl-pyridin-2- yl) propionamide (131 mg, 35%) as a white foam: FAB-HRMS m/e calcd for C2oH22Cl2N2O2 (M+H)+ 392.1058, found 392.1062.
Example 109 3-CycloheptyI-2-(4-methanesulfonyl-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000222_0001
A mixture of magnesium metal (4.81 g, 200 mmol) and dry tetrahydrofuran (10 mL) under argon was treated with a solution of 1,2-dibromoethane (0.94 g, 5 mmol) in dry tetrahydrofuran (5 mL). The resulting reaction mixture was stiπed for 10 min to activate the magnesium metal. The reaction mixture was then treated dropwise with a solution of cycloheptyl bromide (17.7 g, 100 mmol) in dry tetrahydrofuran (30 mL), one-fifth portion over a period of 5 min. The resulting reaction mixture was stiπed for 5-10 min to initiate the exothermic reaction. The remaining portion of the cycloheptyl bromide solution was then added dropwise while controlling the inside temperature below 50°C. After complete addition, the solution was stirred for 1 h and then diluted with dry tetrahydrofuran (80 mL). In a separate reaction flask, a mixture of lithium chloride (8.48 g, 200 mmol, predried at 130°C under high vacuum for 3 h) and copper(I) cyanide (8.96 g, 100 mmol) in dry tetrahydrofuran (110 mL) was stiπed at 25°C under argon for 10 min to obtain a clear solution. The reaction mixture was cooled to -70°C and then slowly treated with the freshly prepared cycloheptylmagnesium bromide. After the addition, the reaction mixture was allowed to warm to -10°C where it was stiπed for 5 min. The resulting reaction mixture was again cooled back to -70°C and then treated with methyl propiolate (7.57 g, 90 mmol). The reaction mixture was stirred for 15 h at -70°C to -50°C and then slowly treated with a solution of iodine (34.3 g, 135 mmol) in dry tetrahydrofuran (30 mL), with the temperature kept at -70°C to -60°C. After addition of the iodine solution, the cooling bath was removed, and the reaction mixture was allowed to warm to 25 °C where it was stiπed for 2 h. The reaction mixture was then poured into a solution consisting of a saturated aqueous ammonium chloride solution (400 mL) and ammonium hydroxide (100 mL), and the organic compound was extracted into ethyl acetate (3 x 200 mL). The combined organic extracts were successively washed with a saturated aqueous sodium thiosulfate solution (1 x 400 mL) and a saturated aqueous sodium chloride solution (1 x 400 mL). The organic layer was then dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 20/1 to 10/1 hexanes/diethyl ether) afforded (E)-3- cycloheptyl-2-iodo- acrylic acid methyl ester (17.86 g, 64%) as a colorless oil: EI-HRMS m/e calcd for CπH17IO2 (M+) 308.0273, found 308.0273.
A mixture of zinc dust (2.6 g, 40 mmol, Aldrich, -325 mesh) and dry tetrahydrofuran (3 mL) under argon was treated with 1,2-dibromoethane (0.38 g, 2 mmol). The zinc suspension was then heated with a heat gun to ebullition, allowed to cool, and heated again. This process was repeated three times to make sure the zinc dust was activated. The activated zinc dust suspension was then treated with trimethylsilyl chloride (220 mg, 2 mmol), and the suspension was stiπed for 15 min at 25°C. The reaction mixture was then treated dropwise with a solution of (E)-3-cycloheptyl-2-iodo-acrylic acid methyl ester (6.16 g, 20 mmol) in dry tetrahydrofuran (5 mL) over 10 min. The reaction mixture was then stirred at 40-45°C for 1 h and then stiπed overnight at 25°C. The reaction mixture was then diluted with dry tetrahydrofuran (10 mL), and the stirring was stopped to allow the excess zinc dust to settle down (~2 h). In a separate reaction flask, bis(dibenzylideneacetone)palladium(0) (270 mg, 0.5 mmol) and triphenylphosphine (520 mg, 2 mmol) in dry tetrahydrofuran (25 mL) was stiπed at 25°C under argon for 10 min and then treated with 4-bromophenyl methyl sulfone (4.23 g, 18 mmol) and the freshly prepared zinc compound in tetrahydrofuran. The resulting brick red solution was heated at 50°C for 24 h. The reaction mixture was cooled to 25 °C and then poured into a saturated aqueous ammonium chloride solution (150 mL), and the organic compound was extracted into ethyl acetate (3 x 150 mL). The combined organic extracts were washed with a saturated aqueous sodium chloπde solution (1 x 300 mL), dned over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 to 1/1 hexanes/ethyl acetate) afforded (E)-3-cycloheptyl- 2-(4-methanesulfonyl-phenyl)-acryhc acid methyl ester (6.01 g, 99%) as a viscous yellow oil: EI-HRMS m/e calcd for Cι8H24O4S (M+) 336.1395, found 336.1395.
A solution of nιckel(II) chloπde hexahydrate (7.8 mg, 0.033 mmol) and (E)-3- cycloheptyl-2-(4-methanesulfonyl-phenyl)-acrylιc acid methyl ester (111 mg, 0.33 mmol) in methanol (3 mL) was cooled to 0°C and then treated with sodium borohydnde (25 mg, 0.66 mmol) in two portions. After the addition, the black reaction mixture was stirred for 15 mm at 0°C and then allowed to warm to 25°C where it was stiπed for 15 h. The black solid was filtered using filter paper and washed with methanol. The combined solvents were concentrated in vacuo, and the residue was diluted with water (25 mL) and ethyl acetate (25 mL). The two layers were separated, and the aqueous layer was extracted with ethyl acetate (1 x 15 mL). The combined organic extracts were washed with a saturated aqueous sodium chloπde solution (1 x 50 mL), dned over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford racemic 3-cycloheptyl-2-(4-methanesulfonyl- phenyl)-propιonιc acid methyl ester (101 mg, 91%) as a colorless oil: EI-HRMS m/e calcd for d8H26O4S (M+) 338.1552, found 338.1555.
A solution of 3-cycloheptyl-2-(4-methanesulfonyl-phenyl)-propιonιc acid methyl ester (95 mg, 0.28 mmol) in ethanol (2 mL) was treated with a IN aqueous sodium hydroxide solution (1.5 mL). The solution was heated at 45-50°C for 15 h, at which time, thm layer chromatography analysis of the reaction mixture indicated the absence of starting matenal The reaction mixture was concentrated in vacuo to remove ethanol. The residue was diluted with water (10 mL) and extracted with diethyl ether (1 x 20 mL) to remove any neutral impunties. The aqueous layer was then acidified with a IN aqueous hydrochlonc acid solution, and the resultmg acid was extracted into ethyl acetate (2 x 15 mL). The combined organic layers were washed with a saturated aqueous sodium chlonde solution (1 x 50 mL), dπed over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford 3-cycloheptyl-2-(4-methanesulfonyl-phenyl)-propιomc acid (78 mg, 86%) as a white solid: EI-HRMS m/e calcd for C H24O4S (M+H)+ 325.1474, found 325.1478.
A solution of tnphenylphosphme (116 mg, 0.44 mmol) m methylene chlonde (2 mL) was cooled to 0°C and then treated with N-bromosuccmimide (78 mg, 0.44 mmol). The reaction mixture was stiπed at 0°C for 30 m and then treated with a solution of 3- cycloheptyl-2-(4-methanesulfonyl-phenyl)-propιonιc acid (72 mg, 0.22 mmol) m methylene chloπde (2 mL). The clear solution was stirred for 10 m at 0°C and then allowed to warm to 25°C where it was stiπed for 1.5 h. The reaction mixture was then treated with 2-ammothιazole (66 mg, 0.66 mmol), and the resulting suspension was stirred for 20 h at 25°C. The reaction mixture was then concentrated in vacuo to remove methylene chlonde, and the residue was diluted with ethyl acetate (30 mL) and a IN aqueous hydrochlonc acid solution (30 mL) The two layers were separated, and the aqueous layer was extracted with ethyl acetate (1 x 10 mL). The combined organic extracts were successively washed with a saturated aqueous sodium bicarbonate solution (1 x 20 mL) and a saturated aqueous sodium chloπde solution (1 x 30 mL), dned over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 4/1 to 1/1 hexanes/ethyl acetate) afforded 3- cycloheptyl-2-(4-methanesulfonyl-phenyl)-Ν-thιazol-2-yl-propιonamιde (68 mg, 76%) as an amorphous solid: EI-HRMS m/e calcd for C20H26N2O3S2 (M+) 406.1426, found 406.1424.
Example 110 3-CyclohexyI-2-(4-methanesulfonyl-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000226_0001
A mixture of zmc dust (16.34 g, 250 mmol, Aldnch, -325 mesh) and dry tetrahydrofuran (6 mL) under argon was treated with 1,2-dibromoethane (0.94 g, 5 mmol). The zmc suspension was then heated with a heat gun to ebullition, allowed to cool, and heated again This process was repeated three times to make sure the zmc dust was activated. The activated zmc dust suspension was then treated with tnmethylsilyl chloπde (0 54 g, 5 mmol), and the suspension was stiπed for 15 m at 25°C The reaction mixture was then treated dropwise with a solution of cyclohexyl iodide (21 g, 100 mmol) m dry tetrahydrofuran (30 mL) over 15 mm. Dunng the addition, the temperature rose to 60°C. The reaction mixture was then stiπed for 3 h at 40-45°C. The reaction mixture was then cooled to 25°C and diluted with dry tetrahydrofuran (60 mL) The stirπng was stopped to allow the excess zmc dust to settle down (~3 h) In a separate reaction flask, a mixture of lithium chlonde (8 48 g, 200 mmol, predned at 130°C under high vacuum for 3 h) and copper(I) cyanide (8.95 g, 100 mmol) in dry tetrahydrofuran (110 mL) was stirred for 10 mm at 25°C to obtain a clear solution. The reaction mixture was cooled to -70°C and then slowly treated with the freshly prepared zmc solution using a syπnge. After the addition, the reaction mixture was allowed to warm to 0°C where it was stirred for 5 mm. The reaction mixture was again cooled back to -70°C and then slowly treated with methyl propiolate (7.56 g, 90 mmol) The resulting reaction mixture was stiπed for 15 h at -70°C to -50°C and then slowly treated with a solution of iodine (34.26 g, 135 mmol) in dry tetrahydrofuran (30 mL), with the temperature kept at -70°C to -60°C. After addition of the iodine solution, the cooling bath was removed, and the reaction mixture was allowed to warm to 25°C where it was stiπed for 2 h. The reaction mixture was then poured into a solution consisting of a saturated aqueous ammonium chloride solution (400 mL) and ammonium hydroxide (100 mL), and the organic compound was extracted into ethyl acetate (3 x 250 mL). The combined organic extracts were successively washed with a saturated aqueous sodium thiosulfate solution (1 x 500 mL) and a saturated aqueous sodium chloride solution (1 x 500 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 9/1 hexanes/diethyl ether) afforded (E)-3-cyclohexyl-2-iodo-acrylic acid methyl ester (26.3 g, 99%) as a light pink oil: EI-HRMS m e calcd for C10Hι5IO2 (M+) 294.0117, found 294.0114.
A mixture of zinc dust (2.6 g, 40 mmol, Aldrich, -325 mesh) and dry tetrahydrofuran (3 mL) under argon was treated with 1,2-dibromoethane (0.37 g, 2 mmol). The zinc suspension was then heated with a heat gun to ebullition, allowed to cool, and heated again. This process was repeated three times to make sure the zinc dust was activated. The activated zinc dust suspension was then treated with trimethylsilyl chloride (217 mg, 2 mmol), and the suspension was stirred for 15 min at 25°C. The reaction mixture was then treated dropwise with a solution of (E)-3-cyclohexyl-2-iodo-acrylic acid methyl ester (5.88 g, 20 mmol) in dry tetrahydrofuran (5 mL) over 5 min. During the addition, the temperature rose to 50°C. The reaction mixture was then stiπed at 40-45°C for 1 h and then stiπed overnight at 25°C. The reaction mixture was then diluted with dry tetrahydrofuran (10 mL), and the stirring was stopped to allow the excess zinc dust to settle down (~2 h). In a separate reaction flask, bis(dibenzylideneacetone)palladium(0) (270 mg, 0.5 mmol) and triphenylphosphine (520 mg, 2 mmol) in dry tetrahydrofuran (25 mL) was stirred at 25°C under argon for 10 min and then treated with 4-bromophenyl methyl sulfone (4.23 g, 18 mmol) and the freshly prepared zinc compound in tetrahydrofuran. The resulting brick red solution was heated at 50°C for 24 h, at which time, thin layer chromatography analysis of the reaction mixture indicated the absence of starting material. The reaction mixture was cooled to 25°C and then poured into a saturated aqueous ammonium chloride solution (150 mL), and the organic compound was extracted into ethyl acetate (3 x 100 mL). The combined organic extracts were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/2 hexanes/ethyl acetate) afforded (E)-3-cyclohexyl-2-(4- methanesulfonyl-phenyl)-acrylic acid methyl ester (5.79 g, 99%) as a low melting white solid: EI-HRMS m/e calcd for C17H22O4S (M+) 322.1238, found 322.1236.
A solution of nickel(II) chloride hexahydrate (157 mg, 0.66 mmol) and (E)-3-cyclohexyl- 2-(4-methanesulfonyl-phenyl)-acrylic acid methyl ester (1.07 g, 3.31 mmol) in methanol (30 mL) was cooled to 0°C and then treated with sodium borohydride (380 mg, 10 mmol) in four portions. After the addition, the black reaction mixture was stirred for 15 min at 0°C and then allowed to warm to 25°C where it was stiπed for 15 h. The black solid was filtered using filter paper and washed with methanol. The combined solvents were concentrated in vacuo, and the residue was diluted with water (50 mL) and ethyl acetate (50 mL). The two layers were separated, and the aqueous layer was extracted with ethyl acetate (1 x 25 mL). The combined organic extracts were washed with a saturated aqueous sodium chloride solution (1 x 50 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford racemic 3-cyclohexyl-2-(4-methanesulfonyl- phenyl)-propionic acid methyl ester (1.04 g, 97%) as an amorphous white solid: EI- HRMS m/e calcd for C17H24O4S (M+) 324.1395, found 324.1395.
A solution of 3-cyclohexyl-2-(4-methanesulfonyl-phenyl)-propionic acid methyl ester (1.00 g, 3.08 mmol) in ethanol (15 mL) was treated with a IN aqueous sodium hydroxide solution (6 mL). The solution was heated at 45-50°C for 15 h, at which time, thin layer chromatography analysis of the mixture indicated the absence of starting material. The reaction mixture was then concentrated in vacuo to remove ethanol, and the residue was diluted with water (20 mL) and extracted with diethyl ether (1 x 40 mL) to remove any neutral impurities. The aqueous layer was acidified with a IN aqueous hydrochloric acid solution. The resulting acid was extracted into ethyl acetate (2 x 50 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 50 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford 3-cyclohexyl-2-(4-methanesulfonyl-phenyl)-propionic acid (570 mg, 60%) as a white solid: mp 139-143°C; EI-HRMS m/e calcd for C16H22O4S (M+) 310.1239, found 310.1241.
A solution of triphenylphosphine (416 mg, 1.58 mmol) in methylene chloride (8 mL) was cooled to 0°C and then treated with N-bromosuccinimide (281 mg, 1.58 mmol). The reaction mixture was stiπed at 0°C for 30 min and then treated with a solution of 3- cyclohexyl-2-(4-methanesulfonyl-phenyl)-propionic acid (290 mg, 0.93 mmol) in methylene chloride (5 mL). The clear solution was stirred for 15 min at 0°C and then allowed to warm to 25°C where it was stiπed for 1.5 h. The reaction mixture was then treated with 2-aminothiazole (233 mg, 2.32 mmol), and the resulting suspension was stiπed for 20 h at 25 °C. The reaction mixture was concentrated in vacuo to remove methylene chloride, and the residue was diluted with ethyl acetate (50 mL) and a IN aqueous hydrochloric acid solution (50 mL). The two layers were separated, and the aqueous layer was extracted with ethyl acetate (1 x 30 mL). The combined organic extracts were successively washed with a saturated aqueous sodium bicarbonate solution (1 x 50 mL) and a saturated aqueous sodium chloride solution (1 x 50 mL), dried over anhydrous magnesium sulfate, filtered, and, concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 4/1 to 1/1 hexanes/ethyl acetate) afforded 3- cyclohexyl-2-(4-methanesulfonyl-phenyl)-Ν-thiazol-2-yl-propionamide (337 mg, 92%) as an amorphous solid: EI-HRMS m/e calcd for C]9H24N2O3S2 (M+) 392.1228, found 392.1230.
Example 111 3-Cyclopentyl-2-(3-nitrophenyl)-N-thiazoI-2-yl-propionamide
Figure imgf000230_0001
A solution of (3-nitro-phenyl)-acetic acid (5.0 g, 27.6 mmol) in methanol (50 mL) was treated with a catalytic amount of sulfuric acid. The reaction mixture was refluxed for 48 h. The reaction was then concentrated in vacuo. The residue was dissolved in methylene chloride (50 mL) and washed with a saturated aqueous sodium bicarbonate solution (2 x 25 mL), water (1 x 50 mL) and a saturated aqueous sodium chloride solution (1 x 50 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo to give (4-nitro-phenyl)-acetic acid methyl ester (5.27 g, 97.9%) as a pale yellow solid: mp 29-30°C; EI-HRMS m/e calcd for C9H9NO4 (M+) 195.0531, found 195.0532.
A solution of freshly prepared lithium dusopropylamide (43.3 mL of a 0.3M stock solution, 12.99 mmol) cooled to -78°C was treated with (3-nitro-phenyl)-acetic acid methyl ester (2.45 g, 12.56 mmol) in tetrahydrofuran/l,3-dimethyl-3,4,5,6-tetrahydro- 2(lH)-pyrimidinone (32 mL, 3:1). The resulting solution was stirred at -78°C for 45 min. At this time, the reaction was treated with a solution of iodomethylcyclopentane (2.78 g, 13.23 mmol) in l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (2.78 mL) and the mixture was stiπed at -78°C for 3 h. The reaction was warmed to 25°C and was stiπed at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (25 mL) and was concentrated in vacuo. The residue was diluted with water (50 mL) and extracted with ethyl acetate (3 x 50 mL). The organics were washed with a saturated aqueous lithium chloride solution (2 x 25 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh 80/20 hexanes/ ethyl acetate) afforded 3-cyclopentyl-2-(3-nitro-phenyl)-propionic acid methyl ester (1.63 g, 46.8%) as pale yellow oil: EI-HRMS m/e calcd for CI5H19NO4 (M+) 277.1314, found 277.1317.
A solution of 3-cyclopentyl-2-(3-nitro-phenyl)-propionic acid methyl ester (0.55 g, 2.0 mmol) in tetrahydrofuran/water (12 mL, 3:1) was treated with lithium hydroxide (185 mg, 4.40 mmol). The reaction was stiπed at 25°C for 48 h. The tetrahydrofuran was then removed in vacuo. The residue was diluted with water (25 mL) and extracted with ether (1 x 20 mL). The aqueous layer was acidified to pH = 2 with a 3N aqueous hydrochloric acid solution. The solution was extracted with methylene chloride (3 x 25 mL). The organics were washed with a saturated aqueous sodium chloride solution (2 x 25 mL), dried over sodium sulfate, filtered, and concentrated in vacuo to give 3-cyclopentyl-2-(3- nitro-phenyl)-propionic acid (0.48 g, 91.9%) as a tan solid: mp 95-99°C; EI-HRMS m/e calcd for C,4HπNO4 (M+) 263.1157, found 263.1156.
A solution of 3-cyclopentyl-2-(3-nitro-phenyl)-propionic acid (432 mg, 1.64 mmol) in methylene chloride (16 mL) was cooled to 0°C and then treated with a 2.0M solution of oxalyl chloride in methylene chloride (0.90 mL, 1.80 mmol) and a few drops of N,N- dimethylformamide. The reaction mixture was stirred at 0°C for 15 min and at 25°C for 1.2 h. The reaction mixture was then treated with a solution of 2-aminothiazole (361.4 mg, 3.61 mmol) and N,N-diisopropylethylamine (0.70 mL, 3.93 mmol) in tetrahydrofuran (16 mL). The reaction mixture was stirred at 25°C for 6 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh 70/30 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(nitrophenyl)-Ν-thiazol-2-yl- propionamide (409.3 mg, 72.2%) as a tan solid: mp 171-174°C; EI-HRMS m/e calcd for C,7H19N3O3S (M+) 345.1147, found 345.1153. Example 112 3-Cyclopentyl-2-(3-methoxy-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000232_0001
A solution of freshly prepared lithium dusopropylamide (23 mL of a 0.3 IM stock solution, 7.13 mmol) cooled to -78°C was treated with (3-methoxy-phenyl)-acetic acid methyl ester (1.07 g, 5.94 mmol) in tetrahydrofuran/l,3-dimethyl-3,4,5,6-tetrahydro- 2(lH)-pyrimidinone (14.8 mL, 3:1). The resulting solution was stirred at -78°C for 45 min. At this time, the reaction was treated with a solution of iodomethylcyclopentane (1.37 g, 6.53 mmol) in l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (1.16 mL). The reaction mixture was stirred at -78°C for 3 h. The reaction was then warmed to 25°C and was stirred at 25°C for 16 h. At this time, the reaction was quenched by the dropwise addition of a saturated aqueous ammonium chloride solution. This solution was diluted with water (100 mL) and extracted into ethyl acetate (3 x 50 mL). The organics were washed with a saturated aqueous lithium chloride solution (1 x 75 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 95/5 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3-methoxy- phenyl)-propionic acid methyl ester (1.39 g, 89.1%) as a clear oil: EI-HRMS m/e calcd for C]6H22O3 (M+) 262.1568, found 262.1561.
A solution of 3-cyclopentyl-2-(3-methoxy-phenyl)-propionic acid methyl ester (1.39 g, 5.29 mmol) in tetrahydrofuran/water/methanol (13.2 mL, 3:1:1) at 25°C was treated with a 2N aqueous sodium hydroxide solution (3.97 mL, 7.94 mmol). The reaction was stirred at 25°C for 48 h. At this time, the reaction mixture was poured into water (50 mL) and extracted with chloroform (3 x 25 mL). The aqueous layer was acidified to pH = 1 with a IN aqueous hydrochloric acid solution. The aqueous layer was extracted with a solution of chloroform/methanol (9:1). The organics were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate with glacial acetic acid) afforded 3-cyclopentyl-2-(3-methoxy- phenyl)-propιonιc acid (1.05 g, 79.8%) as a clear wax: EI-HRMS m/e calcd for Cι5H2oO3 (M +) 248.1412, found 248.1409.
A solution of 3-cyclopentyl-2-(3-methoxy-phenyl)-propιomc acid (500 mg, 2.0 mmol) m methylene chlonde (20 mL) cooled to 0°C was treated with a 2.0M solution of oxalyl chlonde in methylene chlonde (1.1 mL, 2.20 mmol) and a few drops of N,N- dimethylformamide. The reaction mixture was stiπed at 0°C for 10 m then at 25°C for 30 min The reaction mixture was then treated with 2-amιnothιazole (444 mg, 4.42 mmol) and N,N-dnsopropylethylamme (0.84 mL, 4.83 mmol) in tetrahydrofuran (10.1 mL) This solution was stiπed at 25°C for 18 h. At this time, the reaction was concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3-methoxy-phenyl)-Ν-thιazol-2-yl- propionamide (549mg, 82.6%) as a white solid: mp 44-45°C; EI-HRMS m/e calcd for C18H22N2O2S (M+) 330.1402 found 330.1398.
Example 113 3-Cyclopentyl-2-(3-hydroxy-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000233_0001
A l.OM solution of boron tnbromide in methylene chlonde (3.53 mL, 3.53 mmol) at 25°C was treated with a solution of 3-cyclopentyl-2-(3-methoxy-phenyl)-N-thιazol-2-yl- propionamide (prepared m Example 112, 0.11 g, 0.35 mmol) in methylene chlonde (3.5 mL). This solution was stirred at 25°C for 1 h. At this time, the reaction was cooled to 0°C and treated with a dilute aqueous ammonium hydroxide solution. This mixture was stirred at 0°C for 15 min. At this time, the aqueous layer was separated from the organic layer. The aqueous layer was extracted with chloroform (3 x 50 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclopentyl- 2-(3-hydroxy-phenyl)-N-thiazol-2-yl-propionamide (50 mg, 44.7%) as a white solid: mp 177-179°C; EI-HRMS m/e calcd for Cι7H2oN2O2S (M+) 316.1245 found 316.1244.
Example 114
3-Cyclopentyl-N-thiazoI-2-yl-2-(4-trifluoromethoxy-phenyI)-propionamide
Figure imgf000234_0001
A solution of freshly prepared lithium dusopropylamide (23 mL of a 0.3 IM stock solution, 7.13 mmol) cooled to -78°C was treated with (4-trifluorornethoxy-phenyl)-acetic acid (0.74 g, 3.39 mmol) in tetrahydrofuran/ l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyrimidinone (8.5 mL, 3:1). The resulting solution was stirred at -78°C for 45 min. At this time, the reaction was treated with a solution of iodomethylcyclopentane (0.78 g, 3.73 mmol) in l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (1 mL). The reaction mixture was stirred at -78°C for 4 h. The reaction was then warmed to 25°C and was stirred at 25°C for 18 h. The reaction mixture was then quenched by the dropwise addition of saturated aqueous ammonium chloride solution (10 mL). The resulting mixture was concentrated in vacuo to remove the excess solvent. The residue was diluted with water (100 mL) and acidified to pH = 1 with a IN aqueous hydrochloric acid solution. This solution was extracted with ethyl acetate (3 x 50 mL). The organics were washed with a saturated aqueous lithium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- tnfluoromethoxy-phenyl)-propιonιc acid (0.31 g, 30.6%) as a tan solid: mp 62-64°C; EI- HRMS m/e calcd for Ci5H17F3 O3 (M+) 302.1129 found 302.1131.
A solution of 3-cyclopentyl-2-(4-tnfluoromethoxy-phenyl)-propιomc acid (0.16 g, 0.52 mmol) in methylene chlonde (5.3 mL) cooled to 0°C was treated with a 2.0M solution of oxalyl chlonde in methylene chlonde (0.29 mL, 0.58 mmol) and a few drops of N,N- dimethylformamide. The reaction mixture was stiπed at 0°C for 10 mm and at 25°C for 30 min The reaction mixture was then treated with a solution of 2-amιnothιazole (0.11 g, 1.16 mmol) and N,N-dπsopropylethylamιne (0.22 mL, 1.27 mmol) in tetrahydrofuran (2.65 mL) The reaction mixture was stirred at 25°C for 18 h. At this time, the reaction was concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl-Ν-thιazol-2-yl-2-(4- tnfluoromethoxy-phenyl)-propιonamιde (203.8 mg, 100%) as a white solid: mp 168- 170°C, EI-HRMS m/e calcd for C18H19F3N2O2S (M+) 384.1119, found 384.1118
Example 115 3-CycIopentyl-2-(3,4-dimethoxy-phenyl)-N-thiazoI-2-yl-propionamide
Figure imgf000235_0001
A solution of freshly prepared lithium dusopropylamide (58.5 mL of a 0.91M stock solution, 53.2 mmol) cooled to -78°C was treated with (3,4-dιmethoxy-phenyl)-acetιc acid (4.97 g, 25.3 mmol) m tetrahydrofuran/l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)- pyπmidinone (25 3 mL, 3:1). The resulting solution was stirred at -78°C for 45 mm and at 25°C for 15 mm At this time, the reaction was cooled to 0°C and was treated with a solution of lodomethylcyclopentane (5.87 g, 27.8 mmol) in l,3-dιmethyl-3, 4,5,6- tetrahydro-2(lH)-pyπmιdmone (1 mL). The reaction mixture was stirred at 0°C for 30 min The reaction was then warmed to 25°C and was stiπed at 25°C for 18 h. The reaction mixture was then quenched by the dropwise addition of saturated aqueous ammonium chlonde solution (10 mL). The resulting mixture was concentrated in vacuo The residue was diluted with water (100 mL) and acidified to pH = 1 with a IN aqueous hydrochlonc acid solution This solution was extracted with ethyl acetate (3 x 50 mL) The organics were washed with a saturated aqueous lithium chloπde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dιmethoxy-phenyl)-propιonιc acid (4.5 g, 63.8%) as a yellow solid: mp 111-112°C; EI-HRMS m/e calcd for Cι6H22O4 (M1") 278.1518 found 278 1517
A solution of 3-cyclopentyl-2-(3,4-dιmethoxy-phenyl)-propιonιc acid (0.50 g, 1.79 mmol) in methylene chlonde (17.9 mL) cooled to 0°C was treated with a 2.0M solution of oxalyl chlonde in methylene chloπde (1.0 mL, 1.97 mmol) and a few drops of NJSl- dimethylformamide. The reaction mixture was stiπed at 0°C for 10 mm and at 25°C for 30 mm. The reaction mixture was then treated with a solution of 2-amιnothιazole (0.39 g, 3.95 mmol) and N,N-dιιsopropylethylamιne (0.76 mL, 4.3 mmol) in tetrahydrofuran (8.98 mL). The reaction mixture was stirred at 25°C for 18 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dιmethoxy-phenyl)-Ν-thιazol-2-yl- propionamide (665 mg, 100%) as a pale yellow solid: mp 50-52°C; EI-HRMS m/e calcd for C19H24N2O3S (M+) 360.1507, found 360.1516 Example 116 3-Cyclopentyl-2-(3,4-dihydroxy-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000237_0001
A l.OM solution of boron tribromide in methylene chloride (7.43 mL, 7.43 mmol) at 25°C was treated with a solution of 3-cyclopentyl-2-(3,4-dimethoxy-phenyl)-N-thiazol-2- yl-propionamide (prepared in Example 115, 0.27 g, 0.74 mmol) in methylene chloride (7.43 mL). This solution was stiπed at 25°C for 1 h. At this time, the reaction was cooled to 0°C and treated with a dilute aqueous ammonium hydroxide solution. This mixture was stirred at 0°C for 20 min. At this time, the reaction was poured into water and was extracted with chloroform (3 x 50 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dihydroxy- phenyl)-N-thiazol-2-yl-propionamide (38.8 mg, 15.7%) as a white solid: mp 170-173°C; EI-HRMS m/e calcd for C17H20N2O3S (M*) 332.1194 found 332.1192.
Example 117 3-Cyclopentyl-2-(4-methoxy-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000237_0002
A solution of freshly prepared lithium dusopropylamide (58.5 mL of a 0.93M stock solution, 53.2 mmol) cooled to -78°C was treated with (4-methoxy-phenyl)-acetic acid (4.21 g, 25.35 mmol) in tetrahydrofuran/ l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyrimidinone (25.3 mL, 3:1). The resulting solution was stirred at -78°C for 45 min. At this time, the reaction was treated with a solution of iodomethylcyclopentane (5.85 g, 27.8 mmol) in l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (1 mL). The reaction mixture was stiπed at -78°C for 45 min and at 0°C for 1 h. The reaction was then warmed to 25°C and was stirred at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of saturated aqueous ammonium chloride solution (10 mL). The excess solvent was removed in vacuo. The residue was acidified to pH = 1 with a IN aqueous hydrochloric acid solution. This mixture was poured into water (50 mL) and extracted with ethyl acetate (3 x 50mL). The organics were washed with a saturated aqueous lithium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methoxy-phenyl)- propionic acid (2.76 g, 43.8%) as a yellow solid: mp 119-121°C; EI-HRMS m/e calcd for C15H20O3 (M+) 248.1412 found 248.1415.
A solution of 3-cyclopentyl-2-(4-methoxy-phenyl)-propionic acid (500 mg, 2.0 mmol) in methylene chloride (20.1 mL) cooled to 0°C was treated with a 2.0M solution of oxalyl chloride in methylene chloride (1.1 mL, 2.21 mmol) and a few drops of N,N- dimethylformamide. The reaction mixture was stiπed at 0°C for 10 min then at 25°C for 30 min. The reaction mixture was then treated with a solution of 2-aminothiazole (444 mg, 4.42 mmol) and N,N-diisopropylethylamine (0.84 mL, 4.83 mmol) in tetrahydrofuran (10.1 mL). This solution was stiπed at 25°C for 18 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methoxy-phenyl)-Ν-thiazol-2-yl- propionamide (638 mg, 95.8%) as a pale yellow solid: mp 166-167°C; EI-HRMS m/e calcd for Cι8H22N2O2S (M+) 330.1402 found 330.1398. Example 118 3-Cyclopentyl-2-(4-hydroxy-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000239_0001
A solution 3-cyclopentyl-2-(4-methoxy-phenyl)-N-thiazol-2-yl -propionamide (1.03 g, 3.12 mmol) in methylene chloride (31.26 mL) at 25°C was treated with a l.OM solution of boron tribromide in methylene chloride (31.26 mL, 31.26 mmol). This solution was stiπed at 25°C for 4 h. At this time, the reaction was cooled to 0°C and was then quenched by the dropwise addition of a dilute aqueous ammonium hydroxide solution. The resulting solution was stiπed at 0°C for 15 min. This mixture was then poured into water (50 mL) and extracted with ethyl acetate (3 x 30 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-hydroxy- phenyl)-N-thiazol-2-yl-propionamide (626.8 mg, 63.4%) as a off-white solid: mp 198- 200°C; EI-HRMS m/e calcd for C17H20N2O2S (M+) 316.1245 found 316.1256.
Example 119 4-[2-CycIopentyl-l-(thiazol-2-ylcarbamoyl)-ethyI]-benzoic acid methyl ester
Figure imgf000239_0002
A solution of 4-methyl-benzoιc acid (10 g, 73.4 mmol) m benzene (133 mL) was treated with benzoyl peroxide (72 mg, 0.29 mmol). This mixture was heated to reflux until it became homogeneous. At this time, the reaction was treated with N-bromosuccmimide (13 g, 73 4 mmol) and additional benzoyl peroxide (72 mg, 0.29 mmol). This mixture was heated at reflux for 2.5 h. At this time, the reaction was cooled to 25°C. The resulting precipitate was collected by filtration and washed with hot water (50 mL). The solid was taken up in water (150 mL). This slurry was heated at 80°C and then filtered while hot The solid that was collected was dπed in vacuo to afford 4-bromomethyl- benzoic acid (12.3, 77.9%) as a white solid, mp 224-226°C; EI-HRMS m/e calcd for C8H7BrO2 (M +) 213.9629, found 213.9628.
A solution of 4-bromomethyl-benzoιc acid (4.0 g, 18.6 mmol) in acetomtπle (186 mL) was treated with a solution of sodium cyanide (1.0 g, 204 mmol) and sodium hydroxide (0 74 g, 18 6 mmol) in water (24 mL) The reaction mixture was heated at reflux for 2 h. At this time, the reaction was cooled to 25°C and concentrated in vacuo The resulting solution was washed with chloroform (1 x 50 mL). The aqueous layer was acidified to pH = 3 with a IN aqueous hydrochlonc acid solution. The aqueous layer was extracted with a solution of chloroform/methanol (9: 1, 3 x 100 mL). The organics were dned over sodium sulfate, filtered, and concentrated in vacuo to afford 4-cyanomethyl-benzoιc acid (0 79 g, 26.3%) as a white solid: mp 193-195°C; EI-HRMS m/e calcd for C9H7ΝO2 (M+) 161.0476, found 161.0483.
A solution of 4-cyanomethyl-benzoιc acid (0.53 g, 3.31 mmol) in a 50% aqueous hydrochlonc acid solution (42.8 mL) was heated at 80°C for 16 h. At this time, the reaction was cooled to 25°C and brought to pH = 3 by the dropwise addition of a 50% aqueous sodium hydroxide solution. The resulting mixture was diluted with water and extracted with butanol (2 x 50 mL). The organics were then extracted with water (5 x 50 mL, pH = 6-7). The aqueous extracts were brought to pH = 3 with a 3M aqueous hydrochlonc acid solution and concentrated in vacuo to afford 4-carboxymethyl-benzoιc acid (70 mg, 11.7%) as a white solid: mp 235-237°C; EI-HRMS m/e calcd for C9H8O4 (M+) 180.0422, found 180.
A mixture of 4-carboxymethyl-benzoic acid (0.20 g, 1.11 mmol) and nickel (II) chloride hexahydrate (27 mg, 0.11 mol) in methanol (1.11 mL) was heated at 120°C for 24 h. At this time, the reaction mixture was cooled to 25°C and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded 4-methoxycarbonylmethyl-benzoic acid methyl ester (66.7 mg, 28.8%) as a clear oil: EI-HRMS m/e calcd for C„H,2O4 (M+) 208.0735, found 208.0733.
A solution of freshly prepared lithium dusopropylamide (2.3 mL of a 0.3 IM stock solution, 0.71mmol) cooled to -78°C was treated with a solution of 4- methoxycarbonylmethyl-benzoic acid methyl ester (66 mg, 0.31 mmol) in tetrahydrofuran l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (0.85 mL, 3:1). The resulting solution was stirred at -78°C for 45 min. At this time, the reaction was treated with a solution of iodome hylcyclopentane (86 mg, 0.40 mmol) in 1,3-dimethyl- 3,4,5,6-tetrahydro-2(lH)-pyrimidinone (1 mL). The reaction mixture was stirred at - 78°C for 4 h. The reaction was then warmed to 25°C and stirred at 25°C for 18 h. At this time, the reaction mixture was quenched by the slow addition of a saturated aqueous ammonium chloride solution (10 mL). The reaction mixture was then poured into water (50 mL). This solution was extracted into ethyl acetate (3 x 25 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 4-(2- cyclopentyl-l-methoxycarbonyl-ethyl)-benzoic acid methyl ester (60.5 mg, 65.7%) as a clear oil: EI-HRMS m/e calcd for C17H22O4 (M+) 290.1518, found 290.1518.
A solution of 4-(2-cyclopentyl-l-methoxycarbonyl-ethyl)-benzoic acid methyl ester (0.40 g, 1.37 mmol) in tetrahydrofuran/water/methanol (13.7 mL, 3:1:1) was treated with a IN aqueous lithium hydroxide solution. The reaction mixture was stirred at 25°C for 1 h. At this time, the reaction was poured into water. The aqueous layer was acidified to pH = 1 with a IN aqueous hydrochlonc acid solution and extracted with a solution of chloroform/methanol (9:1, 4 x 25 mL). The organics were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded a mixture of 4-(l-carboxy-2-cyclopentyl- ethyl)-benzoιc acid methyl ester and 4-(l-carboxy-2-cyclopentyl-ethyl)-benzoιc acid methyl ester (161.8 mg, 42.5%) as a clear oil: EI-HRMS m/e calcd for C16H20O4 (M +) 276.1361, found 276.1364
A solution of the mixture of 4-(l-carboxy-2-cyclopentyl-ethyl)-benzoιc acid methyl ester and 4-(l-carboxy-2-cyclopentyl-ethyl)-benzoιc acid methyl ester (24.2 mg, 0.08 mmol) m methylene chloπde (0.87 mL) cooled to 0°C was treated with a 2.0M solution of oxalyl chlonde in methylene chlonde (0.05 mL, 0.10 mmol) and a few drops of NN- dimethylformamide The reaction mixture was stiπed at 0°C for 10 mm and at 25°C for 30 mm The reaction mixture was then treated with a solution of 2-ammothiazole (19.3 mg, 0.19 mmol) and N,N-dιιsopropylethylamιne (0.04 mL, 0.21 mmol) in tetrahydrofuran (0 44 mL). The reaction mixture was stirred at 25°C for 4 h At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 4-[2-cyclopentyl-l-(thιazol-2-ylcarbamoyl)-ethyl]- benzoic acid methyl ester (18.1 mg, 57.6%) as an off-white solid: mp 54-56°C; EI-HRMS m/e calcd for Cι9H22Ν2O3S (M +) 358.1351, found 358 1346
Example 120 3-Cyclopentyl-2-(3-fluoro-4-methoxy-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000243_0001
A solution of (3-fluoro-4-hydroxy-phenyl)-acetic acid (1.0 g, 5.87 mmol) in methanol (20 mL) was treated with a catalytic amount of sulfuric acid. The reaction was heated at 120°C for 6 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded (3-fluoro-4-hydroxy-phenyl)-acetic acid methyl ester (1.05 g, 97.6%) as a white solid: mp 34-36°C: EI-HRMS m/e calcd for C9H9FO3 (M+) 184.0535, found 184.0533.
A mixture of 3-fluoro-4-hydroxy-phenyl)-acetic acid methyl ester (1.0 g, 5.43 mmol), potassium carbonate (1.87 g, 13.57 mmol), and methyl iodide (1.12 g, 8.14 mmol) in acetone (27.1 mL) was heated at 90°C for 4 h. At this time, the potassium carbonate was removed by filtration. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded (3-fluoro-4- methoxy-phenyl)-acetic acid methyl ester (1.01 g, 94.3%) as a clear oil: EI-HRMS m/e calcd for C10H„FO3(M+) 198.0692, found 198.0693.
A solution of freshly prepared lithium dusopropylamide (21.6 mL of 0.3 IM stock solution, 6.69 mmol) cooled to -78°C was treated with a solution of (3-fluoro-4-methoxy- phenyl)-acetic acid methyl ester (1.26 g, 6.38 mmol) in tetrahydrofuran/l,3-dimethyl- 3,4,5, 6-tetrahydro-2(lH)-pyrimidinone (16 mL, 3:1). The resulting solution was stirred at -78°C for 45 min. At this time, the reaction was treated with a solution of iodomethylcyclopentane (1.47 g, 7.02 mmol) in l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyrimidinone (2 mL). The reaction mixture was stirred at -78°C for 4 h. The reaction was warmed to 25°C and stirred at 25°C for 48 h. The reaction mixture was then quenched by the slow addition of a saturated aqueous ammonium chloride solution (10 mL). The reaction mixture was then poured into water (100 mL) and extracted with ethyl acetate (3 x 50 mL). The organics were washed with a saturated aqueous lithium chloride solution (1 x 50 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3-fluoro-4-methoxy-phenyl)-propionic acid methyl ester (1.50 g, 83.8%) as a clear oil: EI-HRMS m/e calcd for C16H2ιFO3(M+) 280.1477 found 280.1474.
A solution of 3-cyclopentyl-2-(3-fluoro-4-methoxy-phenyl)-propionic acid methyl ester (1.04 g, 3.73 mmol) in tetrahydrofuran/water/methanol (9.3 mL, 3:1:1) was treated with a IN aqueous lithium hydroxide solution (3.73 mL, 3.73 mmol). The reaction was stiπed at 25°C for 18 h. At this time, the reaction was acidified to pH = 1 with a IN aqueous hydrochloric acid solution and extracted with ethyl acetate (3 x 50 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3-fluoro-4-methoxy-phenyl)-propionic acid (707.8 mg, 71.3%) as a white solid: mp 149-151°C; EI-HRMS m/e calcd for C15H19F O3 (M+) 266.1318 found 266.1317.
A solution of 3-cyclopentyl-2-(3-fluoro-4-methoxy-phenyl)-propionic acid (400.0 mg, 1.50 mmol) in methylene chloride (5.0 mL) cooled to 0°C was treated with a 2.0M solution of oxalyl chloride in methylene chloride (0.82 mL, 1.65 mmol) and a few drops of N,N-dimethylformamide. The reaction mixture was stiπed at 0°C for 10 min and at 25°C for 30 min. The reaction mixture was then treated with a solution of 2- aminothiazole (331 mg, 3.30 mmol) and N,N-diisopropylethylamine (0.62 mL, 3.60 mmol) in tetrahydrofuran (7.5 mL). This solution was stiπed at 25°C for 18 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3-fluoro-4- methoxy-phenyl)-N-thiazol-2-yl-propionamide (538.4 mg, 100%) as a white solid: mp 51-53°C: EI-HRMS m/e calcd for Cι8H2!FN2O2S (M+) 348.1307 found 348.1312.
Example 121 3-CyclopentyI-2-(3-fluoro-4-hydroxy-phenyl)-N-thiazol-2-yl-propionamide
Figure imgf000245_0001
A solution of 3-cyclopentyl-2-(3-fluoro-4-methoxy-phenyl)-N-thiazol-2-yl-propionamide (prepared in Example 120, 305.4 mg, 0.87 mmol) in methylene chloride (8.7 mL) at 25°C was treated with a l.OM solution of boron tribromide in methylene chloride (8.75 mL,
8.75 mmol). This solution was stiπed at 25°C for 5 h. At this time, the reaction was cooled to 0°C and quenched by the dropwise addition of a dilute aqueous ammonium hydroxide solution. The resulting solution was stiπed at 0°C for 15 min. This mixture was then poured into water (50 mL) and extracted with ethyl acetate (3 x 30 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3-fluoro-4-hydroxy-phenyl)-N-thiazol-2-yl-propionamide
(212.7 mg, 72.5%) as a white solid: mp 199-201°C: EI-HRMS m/e calcd for C17H19FN2O2S (M+) 334.1151 found 334.1152. Example 122 6-[2-(3-Chloro-phenyl)-3-cycIopentyl-propionyIamino]-nicotinic acid
Figure imgf000246_0001
A solution of freshly prepared lithium dusopropylamide (141.3 mL of a 0.32M stock solution, 45.0 mmol) cooled to -78°C was treated with (3-chloro-phenyl)-acetιc acid (3.41 g, 20 0 mmol) in tetrahydrofuran/l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynrrndιnone (49 7 mL, 3: 1) The resulting solution was stiπed at -78°C for 1 h. At this time, the reaction was treated with a solution of lodomethylcyclopentane (4.64 g, 22.08 mmol) m l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pyπmιdmone (4 64 mL) The reaction mixture was stiπed at -78°C for 4 h. The reaction was then warmed to 25°C and was stiπed at 25 °C for 48 h This solution was then quenched by the slow addition of the reaction mixture to a 2N aqueous hydrochlonc acid solution (50 mL) The product was extracted into ethyl acetate (1 x 150 mL). The organic layer was dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 85/15 hexanes/ethyl acetate) afforded 2-(3-chloro-phenyl)-3-cyclopentyl-propιomc acid (3 68 g, 72 9%) as a yellow solid: mp 70-72°C, EI-HRMS m/e calcd for d4Hι7C102 (M+) 252.0917, found 252.0915
A solution of 2-(3-chloro-phenyl)-3-cyclopentyl-propιomc acid (504 mg, 2.0 mmol) in methylene chlonde (20 mL) cooled to 0°C was treated with a 2.0M solution of oxalyl chlonde in methylene chlonde (1.1 mL, 2.2 mmol) and a few drops of N,N- dimethylformamide The reaction mixture was stirred at 0°C for 15 mm and at 25°C for 2 h The reaction mixture was then treated with 6-amino-nicotmic acid methyl ester (532 mg, 3.5 mmol) and N,N-dπsopropylethylamme (0.84 mL, 4.8 mmol). This solution was stiπed at 25°C for 18 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 6-[2-(3-chloro-phenyl)-3-cyclopentyl-propιonylammo]-nιcotmιc acid methyl ester (151.9 mg, 19.7%) as a colorless oil: EI-HRMS m/e calcd for C2ιH23ClN2O3 (M+) 386.1397, found 386.1398.
A solution of 6-[2-(3-chloro-phenyl)-3-cyclopentyl-propιonylammo]-nιcotιnιc acid methyl ester (146.9 mg, 0.38 mmol) in tetrahydrofuran/water/methanol (10 mL, 3:1:1) at 25°C was treated with a 2N aqueous sodium hydroxide solution (0 4 mL, 0.80 mmol). The reaction mixture was stiπed at 25°C for 4 d At this time, the reaction was concentrated in vacuo The residue was diluted with water (50 mL) and extracted with diethyl ether (1 x 50 mL) The aqueous layer was acidified to pH = 1 by the dropwise addition of a 3N aqueous hydrochlonc acid solution This solution was extracted with a solution of methylene chlonde/methanol (3: 1, 3 x 75 mL) The organics were dned over magnesium sulfate, filtered, and concentrated in vacuo The resulting solid was tnturated with diethyl ether/hexanes (2:1) to afford 6-[2-(3-chloro-phenyl)-3-cyclopentyl- propionylammo]-nicotinic acid (63.6 mg, 44 4%) as a white solid: mp 251-255°C; EI- HRMS m/e calcd for C20H21C1N2O3 (M+) 372.1240, found 372.1250.
Example 123
6-[3-CyclopentyI-2-(4-nitro-phenyl)-propionylamino]-nicotinic acid methyl ester
Figure imgf000247_0001
A solution of freshly prepared lithium dusopropylamide (430.55 mL of a 0.3M stock solution, 129.16 mmol) cooled to -78°C was treated with (4-nιtro-phenyl)-acetιc acid ethyl ester (26.32 g, 125.83 mmol) m tetrahydrofuran/hexamethylphosphorarmde (312.5 mL, 3.1) The resulting solution was stirred at -78°C for 45 m . At this time, the reaction was treated with a solution of lodomethylcyclopentane (27.75 g, 132.1 mmol) in hexamethylphosphoramide (27.75 mL). The mixture was stiπed at -78°C for 4 h. The reaction was then warmed to 25°C and was stiπed at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (250 mL). This mixture was concentrated in vacuo. The resulting residue was diluted with water (250 mL) and extracted with ethyl acetate (3 x 300 mL). The organics were washed with a saturated aqueous lithium chloπde solution (2 x 250 mL), dned over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 98/2 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- nιtro-phenyl)-propιomc acid ethyl ester (28.30 g, 77.2%) as an yellow oil: EI-HRMS m/e calcd for C16H21NO4 (M+) 291.1470, found 291.1470.
A solution of 3-cyclopentyl-2-(4-nιtro-phenyl)-propιomc acid ethyl ester (14.1 g, 48.06 mmol) in tetrahydrofuran/water (300 mL, 3:1) was treated with lithium hydroxide (4.35 g, 103.67 mmol). The reaction was stiπed at 25°C for 21 h. The tetrahydrofuran was then removed in vacuo. The residue was diluted with water (75 mL) and extracted with ether (3 x 75 mL). The aqueous layer was acidified to pH = 1 with a 3N aqueous hydrochlonc acid solution and extracted into methylene chlonde (3 x 75 mL). The organics were washed with a saturated aqueous sodium chloπde solution (2 x 100 mL), dπed over magnesium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2-(4-nιtro- phenyl)-propιomc acid (11.97 g, 93.6%) as a yellow solid: mp 119-125°C; EI-HRMS m/e calcd for C14Hι7NO4 (M+) 263.1157, found 263.1162.
A solution of 3-cyclopentyl-2-(4-nιtro-phenyl)-propιonιc acid (526 mg, 2.0 mmol) m methylene chlonde (20 mL) cooled to 0°C was treated with a 2.0M solution of oxalyl chloride m methylene chlonde (1.2 mL, 2.4 mmol) and a few drops of N,N- dimethylformamide. The reaction mixture was stirred at 0°C for 15 min and at 25°C for 30 mm The reaction mixture was then treated with a solution of 6-ammo-nιcotmιc acid methyl ester (532 mg, 3 5 mmol) m tetrahydrofuran (10 mL) and NN- diisopropylethylamme (0.84 mL, 4.8 mmol). This solution was stiπed at 25°C for 48 h At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 6-[3-cyclopentyl-2-(4- nitro-phenyl)-propionylammo]-nicotmic acid methyl ester (353.9 mg, 44.6%) as a pale orange glass: EI-HRMS m/e calcd for C2ιH23Ν3O5 (M+) 397.1637, found 397.1631.
Example 124 2-(4-Amino-phenyl)-3-cyclopentyl-N-pyridin-2-yl-propionamide
Figure imgf000249_0001
A solution of 3-cyclopentyl-2-(4-nιtro-phenyl)-propιomc acid (prepared in Example 22, 263 mg, 1.0 mmol) in methylene chloπde (10 mL) cooled to 0°C was treated with a 2.0M solution of oxalyl chlonde in methylene chlonde (0.6 mL, 1.2 mmol) and a few drops of N,N-dιmethylformamιde. The reaction mixture was stirred at 0°C for 15 mm and at 25°C for 30 mm. The reaction mixture was then treated with a solution of 2-ammopyπdme (200.6 mg, 2.14 mmol) in tetrahydrofuran (5 mL) and N,N-dusopropylethylamine (0.42 mL, 2.4 mmol). This solution was stiπed at 25°C for 48 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-mtro-phenyl)-Ν-pyπdιn-2-yl- propionamide (138.6 mg, 40.9%) as a pale yellow glass: EI-HRMS m/e calcd for C,9H21N3O3 (M+) 339.1581, found 339.1582.
A mixture of 3-cyclopentyl-2-(4-nιtro-phenyl)-N-pyndm-2-yl-propιonamιde (130 mg, 0.38 mmol) in ethyl acetate (50 mL) and methanol (5 mL) was treated with a catalytic amount of 10% palladium on activated carbon (50 mg). The resulting mixture was shaken at 25°C under 60 psi of hydrogen gas in a Pan apparatus for 24 h. At this time, the catalyst was removed by filtration through a plug of celite. The filtrate was concentrated in vacuo to afford 2-(4-amino-phenyl)-3-cyclopentyl-N-pyridin-2-yl- propionamide (99.9 mg, 84.3%) as a tan oil: EI-HRMS m/e calcd for C19H23N3O (M+) 309.1834, found 309.1849.
Example 125 6-[2-(4-Amino-phenyI)-3-cyclopentyl-propionylamino]-nicotinic acid methyl ester
Figure imgf000250_0001
A solution of 3-cyclopentyl-2-(4-nitro-phenyl)-propionic acid (prepared in Example 22, 526 mg, 2.0 mmol) in methylene chloride (20 mL) cooled to 0°C was treated with a 2.0M solution of oxalyl chloride in methylene chloride (1.2 mL, 2.4 mmol) and a few drops of N,N-dimethylformamide. The reaction mixture was stiπed at 0°C for 15 min and at 25°C for 30 min. The reaction mixture was then treated with a solution of 6-amino-nicotinic acid methyl ester (532 mg, 3.5 mmol) in tetrahydrofuran (10 mL) and NN- diisopropylethylamine (0.84 mL, 4.8 mmol). This solution was stiπed at 25°C for 48 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 6-[3-cyclopentyl-2-(4- nitro-phenyl)-propionylamino]-nicotinic acid methyl ester (353.9 mg, 44.6%) as a pale orange glass: EI-HRMS m/e calcd for C21H23Ν3O5 (M+) 397.1637, found 397.1631.
A mixture of 6-[3-cyclopentyl-2-(4-nitro-phenyl)-propionylamino]-nicotinic acid methyl ester (300 mg, 0.75 mmol) in ethyl acetate (30 mL) was treated with a catalytic amount of 10% palladium on activated carbon (30 mg). The resulting mixture was shaken at 25°C under 60 psi of hydrogen gas in a Parr apparatus for 24 h. At this time, the catalyst was removed by filtration through a plug of celite The filtrate was concentrated in vacuo to afford 6-[2-(4-amino-phenyl)-3-cyclopentyl-propionylammo]-nicotmic acid methyl ester (262 8 mg, 94.7%) as a pale yellow glass: EI-HRMS m/e calcd for C21H25N3O3 (M+) 367.1895, found 367.1899.
Example 126
3-Cyclohexyl-2-(4-methanesulfonyl-3-trifluoromethyl-phenyl)-N-thiazol-2-yl- propionamide
Figure imgf000251_0001
A solution of isoamyl nitπte (4.02 mL, 30 mmol) in dimethyl disulfide (19.8 mL, 220 mmol) at 25°C was slowly treated with 4-bromo-2-(tπfluoromethyl)anιlme (4.8 g, 20 mmol) The reaction was exothermic with gas evolution. The resulting brown reaction mixture was heated to 80-90°C for 2 h, at which time, thm layer chromatography analysis of the reaction mixture indicated the absence of starting matenal. The reaction mixture was cooled to 25°C and then concentrated in vacuo. The resulting residue was dissolved in ethyl acetate (200 mL). The organic layer was washed successively with a IN aqueous hydrochlonc acid solution (1 x 200 mL) and a saturated aqueous sodium chlonde solution (1 x 200 mL), dned over anhydrous magnesium sulfate, filtered, and concentrated in vacuo Biotage chromatography (FLASH 40M, Silica, 8/1 hexanes/ethyl acetate) afforded 4-bromo-l-methylsulfanyl-2-tnfluoromethyl-benzene (4.73 g, 87%) as a brown oil: EI-HRMS m/e calcd for C8H6BrF3S (M+) 269.9326, found 269.9327. A solution of 4-bromo-l-methylsulfanyl-2-trifluoromethyl-benzene (4.71 g, 17.4 mmol) in methylene chlonde (100 mL) was cooled to -10°C and then treated with 3- chloroperoxybenzoic acid (86% grade, 9.0 g, 52.2 mmol) The reaction mixture was stiπed at -10°C for 10 min and then allowed to warm to 25°C where it was stiπed overnight At this time, thin layer chromatography analysis of the reaction mixture indicated the absence of starting matenal. The reaction mixture was then filtered, and the solids were washed with methylene chloπde (1 x 50 mL). The filtrate was concentrated in vacuo. The resulting residue was dissolved in ethyl acetate (100 mL). The organic layer was washed successively with a saturated aqueous sodium bicarbonate solution (2 x 100 mL) and a saturated aqueous sodium chloπde solution (1 x 100 mL), dned over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford a yellow solid. Recrystalhzation from methylene chlonde (20 mL), diethyl ether (10 mL), and hexanes afforded 4-bromo-l-methanesulfonyl-2-tnfluoromethyl-benzene (3.46 g, 57%) as a white solid: mp 110-112 °C; EI-HRMS m/e calcd for C8H6BrF3O2S (M+) 301.9224, found 301.9223.
A mixture of zinc dust (1.3 g, 20 mmol, Aldnch, -325 mesh) and dry tetrahydrofuran (2 mL) under argon was treated with 1,2-dibromoethane (187 mg, 1 mmol). The zinc suspension was then heated with a heat gun to ebullition, allowed to cool, and heated again This process was repeated three times to make sure the zmc dust was activated. The activated zmc dust suspension was then treated with tπmethylsilyl chlonde (110 mg, 1 mmol), and the suspension was stiπed for 15 mm at 25 °C. The reaction mixture was then treated dropwise with a solution of (E)-3-cyclohexyl-2-ιodo-acryhc acid methyl ester (prepared in Example 110, 2.5 g, 8.5 mmol) in dry tetrahydrofuran (3 mL) over 5 mm. After the addition, the reaction mixture was stiπed for 1 h at 40-45°C and then stiπed overnight at 25°C. The reaction mixture was then diluted with dry tetrahydrofuran (4 mL), and the stirnng was stopped to allow the excess z c dust to settle down (~2 h) In a separate reaction flask, bιs(dιbenzylιdeneacetone)palladιum(0) (108 mg, 0.2 mmol) and tnphenylphosphme (209 mg, 0.8 mmol) in dry tetrahydrofuran (10 mL) was stiπed at 25°C under argon for 10 mm and then treated with 4-bromo-l-methanesulfonyl-2- trifluoromethyl-benzene (2.12 g, 7 mmol) and the freshly prepared zinc compound in tetrahydrofuran. The resulting brick red solution was heated at 40-45°C for 2 d. The reaction mixture was cooled to 25°C and then poured into a saturated aqueous ammonium chloride solution (100 mL), and the organic compound was extracted into ethyl acetate (3 x 75 mL). The combined organic extracts were washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40M, Silica, 9/1 to 3/1 hexanes/ethyl acetate) afforded (E)-3-cyclohexyl-2-(4-methanesulfonyl-3-trifluoromethyl- phenyl)-acrylic acid methyl ester (2.7 g, 99%) as a viscous oil: EI-HRMS m/e calcd for CI 8H2ιF304S (M+) 391.1191, found 391.1200.
A solution of nickel(U) chloride hexahydrate (36.6 mg, 0.154 mmol) and (E)-3- cyclohexyl-2-(4-methanesulfonyl-3-trifluoromethyl-phenyl)-acrylic acid methyl ester (302 mg, 0.77 mmol) in methanol (8 mL) was cooled to 0°C and then treated with sodium borohydride (87 mg, 2.29 mmol) in four portions. After the addition, the black reaction mixture was stirred for 15 min at 0°C and then allowed to warm to 25°C where it was stiπed for 15 h. The black solid was filtered using filter paper and washed with methanol. The combined solvents were concentrated in vacuo, and the residue was diluted with ethyl acetate (50 mL). The organic layer was washed successively with a 3N aqueous hydrochloric acid solution (1 x 50 mL), a saturated aqueous sodium bicarbonate solution (1 x 50 mL) and a saturated aqueous sodium chloride solution (1 x 50 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford racemic 3-cyclohexyl-2-(4-methanesulfonyl-3-trifluoromethyl-phenyl)-propionic acid methyl ester (280 mg, 93%) as a viscous oil: EI-HRMS m/e calcd for C18H23F3O4S (M+) 392.1269, found 392.1276.
A solution of 3-cyclohexyl-2-(4-methanesulfonyl-3-trifluoromethyl-phenyl)-propionic acid methyl ester (265 mg, 0.67 mmol) in ethanol (5 mL) was treated with a IN aqueous sodium hydroxide solution (1.5 mL). The solution was heated at 45-50°C for 5 h, at which time, thin layer chromatography analysis of the mixture indicated the absence of starting matenal. The reaction mixture was then concentrated in vacuo to remove ethanol, and the residue was diluted with water (20 mL) and extracted with diethyl ether (1 x 40 mL) to remove any neutral impuπties. The aqueous layer was acidified with a IN aqueous hydrochlonc acid solution. The resulting acid was extracted into ethyl acetate (2 x 50 mL) The combined organic layers were washed with a saturated aqueous sodium chlonde solution (1 x 50 mL), dned over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford 3-cyclohexyl-2-(4-methanesulfonyl-3-trifluoromethyl- phenyl)-propιomc acid (249 mg, 97%) as a viscous oil' EI-HRMS m/e calcd for C17H21F3O4S (M +) 378.1113, found 378.1121.
A solution of tnphenylphosphme (279 mg, 1.06 mmol) in methylene chlonde (5 mL) was cooled to 0°C and then treated with N-bromosuccmimide (188.7 mg, 1.06 mmol). The reaction mixture was stiπed at 0°C for 30 m and then treated with a solution of 3- cyclohexyl-2-(4-methanesulfonyl-3-tnfluoromethyl-phenyl)-propιonιc acid (237 mg, 0.626 mmol) in methylene chlonde (4 mL). The clear solution was stirred for 15 mm at 0°C and then allowed to warm to 25°C where it was stiπed for 2 h. The reaction mixture was then treated with 2-amιnothιazole (188 mg, 1.88 mmol), and the resulting suspension was stiπed for 15 h at 25°C. The reaction mixture was concentrated in vacuo to remove methylene chlonde, and the residue was diluted with ethyl acetate (50 mL) and a IN aqueous hydrochlonc acid solution (50 mL). The two layers were separated, and the aqueous layer was extracted with ethyl acetate (1 x 30 mL). The combined organic extracts were successively washed with a saturated aqueous sodium bicarbonate solution (1 x 50 mL) and a saturated aqueous sodium chloride solution (1 x 50 mL), dned over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 4/1 to 2/1 hexanes/ethyl acetate) afforded 3- cyclohexyl-2-(4-methanesulfonyl-3-tπfluoromethyl-phenyl)-Ν-thιazol-2-yl-propιonamιde (83 mg, 29%) as an amorphous solid: EI-HRMS m/e calcd for C20H23F3N2O3S2 (M+) 460.1102, found 460.1100. Example 127 (A) 3-Cyclohexyl-2-(3,4-dichloro-phenyl)-propionyl]-urea
Figure imgf000255_0001
A solution of (3,4-dichloro-phenyl)-acetic acid (14.0 g, 0.068 mol) in methanol (71mL) was treated with a catalytic amount of sulfuric acid. The reaction mixture was refluxed for 12 h. The reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded (3,4-dichloro-phenyl)-acetic acid methyl ester (15.0 g, quant.) as a white solid: mp 30-32°C; EI-HRMS m/e calcd for C9H8Cl2O2 (M+) 217.9901, found 217.9907.
A solution of freshly prepared lithium dusopropylamide (16.3 mL of a 0.3 IM stock solution, 5.04 mmol) cooled to -78°C was treated with (3,4-dichloro-phenyl)-acetic acid methyl ester (1.0 g, 4.58 mmol) in tetrahydrofuran/hexamethylphosphora ide (8.6 mL, 3:1). The resulting solution was stiπed at -78°C for 45 min. At this time, the reaction was treated with a solution of bromomethylcyclohexane (1.92 mL, 13.76 mmol) in hexamethylphosphoramide (1 mL). The reaction mixture was stirred at -78°C for 3 h. The reaction was warmed to 25°C and stirred at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (20 mL). This mixture was poured into water (100 mL) and extracted with ethyl acetate (3 x 50 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded 3-cyclohexyl-2-(3,4-dichloro-phenyl)-propionic acid methyl ester (1.5 g, quant.) as a clear oil: EI-HRMS m/e calcd for Cι6H2oCl2O2 (M+) 314.0840, found 314.0836
A mixture of 3-cyclohexyl-2-(3,4-dιchloro-phenyl)-propιonιc acid methyl ester (582 mg, 1.84 mmol) and urea (222 mg, 3.69 mmol) in a solution of magnesium methoxide m methanol (7.4 wt%, 3.96 mL, 2.76 mmol) was refluxed at 120°C for 12 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclohexyl-2-(3,4-dιchloro- phenyl)-propιonyl]-urea (52.9 mg, 8.3%) as a white solid: mp 76-79°C; EI-HRMS m/e calcd for C 16H2oCl2N2O2 (M+) 342.0902, found 342 0904
(B) In an analogous manner, there were obtained:
(a) From 3-cyclopropyl-2-(3,4-dιchloro-phenyl)-propιonιc acid methyl ester and urea: [3- Cyclopropyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea as a white solid: mp 117-119°C; EI- HRMS m/e calcd for dsHuC^Oz (M+) 300.0432, found 300.0431.
(b) From 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonιc acid methyl ester and urea: [3- Cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea as a white solid: mp 103-105°C; EI- HRMS m/e calcd for Ci5H18Cl2N2O2 (M+) 328.0745, found 328.0750.
(c) From 3-cyclobutyl-2-(3,4-dιchloro-phenyl)-propιonιc acid methyl ester and urea: [3- Cyclobutyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea as a white solid: mp 65-67°C; EI- HRMS m/e calcd for C14Hι6Cl2N2θ2 (M+) 314.0589, found 314.0597.
(d) From 3-cycloheptyl-2-(3,4-dιchloro-phenyl)-propιonιc acid methyl ester and urea: [3- Cycloheptyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea as a white solid: mp 69-71°C, EI- HRMS m/e calcd for Cι7H22Cl2N2O2 (M+) 356.1058, found 356.1054. (e) From l-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-3-methyl ester and methyl urea: l-[3-Cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-3-methyl-urea as a white solid: mp 120-125°C; EI-HRMS m/e calcd for C16H20C12N2O2 (M+) 342.0902, found 342.0903. (f) From 3-cyclohexyl-2-(3,4-dichloro-phenyl)-propionic acid methyl ester and methyl urea: [3-Cyclohexyl-2-(3,4-dichloro-phenyl)-propionyl]-3-methyl-urea as a white solid: mp 69-73°C; EI-HRMS m/e calcd for d7H22Cl2N2O2 (M+) 356.1058, found 356.1046.
(g) From l-[2-(3,4-dichloro-phenyl)-4-methyl-pentanoyl]-3-methyl ester and methyl-urea: l-[2-(3,4-Dichloro-phenyl)-4-methyl-pentanoyl]-3-methyl-urea as a white solid: mp 123- 125°C; EI-HRMS m/e calcd for C14H18Cl2N2O2 (M+) 316.0745, found 316.0740.
(h) From 2-(3,4-dichloro-phenyl)-hexanoic acid methyl ester and methyl-urea: l-[2-(3,4- Dichloro-phenyl)-hexanoyl]-3-methyl-urea as a clear oil: EI-HRMS m/e calcd for C14H18Cl2N2O2 (Nr) 316.0743, found 316.0745.
Example 128 l-[2-(3-Chloro-phenyl)-3-cyclopentyl-propionyI]-3-methyl-urea
Figure imgf000257_0001
(3-Chloro-phenyl)-acetic acid (6.03 g, 0.03 mol) was dissolved in ethanol (37.7 mL) and treated with a catalytic amount of sulfuric acid. The reaction mixture was refluxed for 12 h. The reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded (3-chloro-phenyl)-acetic acid ethyl ester (6.10 g, 86.8%) as a clear oil: EI-HRMS m/e calcd for C10HnClO2 (M+) 198.0448, found 198.0442.
A solution of freshly prepared lithium dusopropylamide (23 mL of 0.3 IM stock solution, 7.13 mmol) cooled to -78°C was treated with (3-chloro-phenyl)-acetic acid ethyl ester (1.28 g, 6.48 mmol) in tetrahydrofuran/hexamethylphosphoramide (16.1 mL, 3:1). The resultmg solution was stiπed at -78°C for 45 mm. At this time, the reaction was treated with a solution of lodomethylcyclopentane (1.50 g, 7.13 mmol) in hexamethylphosphoramide (1 mL) The reaction mixture was stiπed at -78°C for 4 h. The reaction was warmed to 25 °C and stirred at 25 °C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloπde solution (20 mL). This mixture was poured into water (100 mL) and extracted with ethyl acetate (3 x 50 mL) The organics were dπed over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded 2-(3-chloro-phenyl)-3-cyclopentyl-propιonιc acid ethyl ester (1.70 g, 93%) as a yellow oil: EI-HRMS m/e calcd for Cι6H21ClO2 (M+) 280.1230, found 280.1238
A mixture of 2-(3-chloro-phenyl)-3-cyclopentyl-propιonιc acid ethyl ester (1 70 g. 6.05 mmol) and methyl urea (673 mg, 9.08 mmol) in a solution of magnesium methoxide m methanol (7.4 wt%, 17.3 mL, 12.1 mmol) was refluxed at 100°C for 6 h. The reaction mixture was then concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded l-[2-(3-chloro-phenyl)-3- cyclopentyl-propιonyl]-3-methyl-urea (149.1 mg, 8 %) as a white solid: mp 52-55°C; EI- HRMS m/e calcd for Cι6H2]ClN2O2 (M+) 308.1292, found 308.1287
Example 129 l-[3-Cyclopentyl-2-(3,4-difluoro-phenyl)-propionyl]-3-methyl-urea
Figure imgf000258_0001
A solution of (3,4-dιfluoro-phenyl)-acetιc acid (5.0 g, 0.029 mol) m methanol (30.0 mL) was treated with a catalytic amount of sulfuπc acid The reaction mixture was refluxed for 4 h. The reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded (3,4-dιfluoro-phenyl)-acetιc acid methyl ester (5.15 g, 95.2%) as a clear oil: EI-HRMS m/e calcd for C9H8F2O2 (M+) 186.0493, found 186 0492.
A solution of freshly prepared lithium dusopropylamide (23.0 mL of a 0.3 IM stock solution, 7.13 mmol) cooled to -78°C was treated with (3,4-dιfluoro-phenyl)-acetιc acid methyl ester (1.20 g, 6.48 mmol) in tetrahydrofuran/hexamethylphosphorarmde (16.1 mL, 3: 1). The resultmg solution was stiπed at -78°C for 45 m . At this time, the reaction was treated with a solution of lodomethylcyclopentane (1.50 g, 7.13 mmol) m hexamethylphosphoramide (1 mL). The reaction mixture was stirred at -78°C for 4 h. The reaction was then warmed to 25°C and was stiπed at 25°C for 16 h The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chlonde solution (20 mL). This mixture was poured into water (100 mL) and extracted with ethyl acetate (3 x 50 mL) The organics were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dιfluoro-phenyl)-propιomc acid methyl ester (1.79 g, quant.) as a clear oil: EI-HRMS m/e calcd for d5Hι8F2O2 (M+) 268.1275, found 268.1278.
A mixture of 3-cyclopentyl-2-(3,4-dιfluoro-phenyl)-propιomc acid methyl ester (1.65 g, 6.14 mmol) and methyl urea (683 mg, 9.22 mmol) in a solution of magnesium methoxide in methanol (7.4 wt%, 16.6 mL, 12.3 mmol) was refluxed at 100°C for 8 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2-(3,4-dιfluoro- phenyl)-propιonyl]-3-methyl-urea (180 mg, 9.4%) as a white solid: mp 111-113°C; EI- HRMS m/e calcd for d6H20F2N2O2 (M+) 310.1493, found 310.1499. Example 130 l-[2-(4-Chloro-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea
Figure imgf000260_0001
A solution of (4-chloro-phenyl)-acetιc acid (6.29 g, 0.03 mol) m ethanol (38.4 mL) was treated with a catalytic amount of sulfunc acid The reaction mixture was refluxed for 12 h. The reaction was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded (4-chloro-phenyl)-acetιc acid ethyl ester (6.45 g, 88%) as a pale yellow solid: mp 39-41°C; EI-HRMS m/e calcd for CioHi 1CIO2 (M+) 198.0448, found 198.0452.
A solution of freshly prepared lithium dusopropylamide (23.0 mL of 0.3 IM stock solution, 7.13 mmol) cooled to -78°C was treated with (4-chloro-phenyl)-acetιc acid ethyl ester (1.28 g, 6.48 mmol) tetrahydrofuran/hexamethylphosphoramide (16.1 mL, 3:1) The resulting solution was stirred at -78°C for 45 m . At this time, the reaction was treated with a solution of lodomethylcyclopentane (1.50 mg, 7.13 mmol) in hexamethylphosphoramide (1 mL). The reaction mixture was stiπed at -78°C for 4 h. The reaction was warmed to 25°C and stirred at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (20 mL). This mixture was poured into water (100 mL) and extracted with ethyl acetate (3 x 50 mL). The organics were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded 2-(4-chloro-phenyl)-3-cyclopentyl-propιonιc acid ethyl ester (1 65 g, 90.9%) as a yellow oil: EI-HRMS m/e calcd for d6H2ιCl2O2 (M+) 280.1230, found 280.1227 A mixture of 2-(4-chloro-phenyl)-3-cyclopentyl-propionic acid ethyl ester (1.65 g, 5.89 mmol) and methyl urea (654 mg, 8.83 mmol) in a solution of magnesium methoxide in methanol (7.4 wt%, 16.9 mL, 11.78 mmol) was refluxed at 100°C for 6 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded l-[2-(4-chloro-phenyl)-3- cyclopentyl-propionyl]-3-methyl-urea (105.3 mg, 5.8 %) as a white solid: mp 145-147°C; EI-HRMS m e calcd for d6H2ιClN2O2 (M+) 308.1292, found 308.1291.
Example 131 l-[3-Cyclopentyl-2-(4-nitro-phenyI)-propionyl]-3-methyl-urea
Figure imgf000261_0001
A solution of freshly prepared lithium dusopropylamide (430.55 mL of a 0.3M stock solution, 129.16 mmol) cooled to -78°C was treated with (4-nitro-phenyl)-acetic acid ethyl ester (26.32 g, 125.83 mmol) in tetrahydrofuran/hexamethylphosphoramide (312.5 mL, 3:1). The resulting solution was stiπed at -78°C for 45 min. At this time, the reaction was treated with a solution of iodomethylcyclopentane (27.75 g, 132.1 mmol) in hexamethylphosphoramide (27.8 mL). The mixture was stirred at -78°C for 4 h. The reaction was then warmed to 25°C and was stirred at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (250 mL). The reaction mixture was concentrated in vacuo. The residue was diluted with water (250 mL) and extracted with ethyl acetate (3 x 300 mL). The organics were washed with a saturated aqueous lithium chloride solution (2 x 250 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 95/5 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- nιtro-phenyl)-propιonιc acid ethyl ester (28.30 g, 77.2%) as a yellow oil: EI-HRMS m/e calcd for C16H2,NO4 (M+) 291.1470, found 291.1470.
A mixture of 3-cyclopentyl-2-(4-mtro-phenyl)-propιonιc acid ethyl ester (1.27 g, 4.36 mmol) and methyl urea (647 mg, 8.73 mmol) in a solution of magnesium methoxide in methanol (7.4 wt%, 9.36 mL, 6.54 mmol) was refluxed at 100°C for 8.5 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2-(4-nιtro-phenyl)- propιonyl]-3-methyl-urea (183.6 mg, 13.2 %) as a white solid, mp 179-183°C; EI-HRMS m/e calcd for d6H21N3O4 (M+) 319 1532, found 319.1527
Example 132 l-(3-Cyclopentyl-2-phenyl-propionyl)-3-methyl-urea
Figure imgf000262_0001
A solution of freshly prepared lithium dusopropylamide (23 mL of a 0.3 IM stock solution, 7.13 mmol) cooled to -78°C was treated with phenyl-acetic acid ethyl ester (1.06 g, 6 48 mmol) in tetrahydrofuran/hexamethylphosphorarmde (16.1 mL, 3:1) The resulting solution was stiπed at -78°C for 45 mm. At this time, the reaction was treated with a solution of lodomethylcyclopentane (1.50 g, 7.14 mmol) m hexamethylphosphoramide (1.5 mL). The mixture was stiπed at -78°C for 4 h The reaction was then warmed to 25°C and was stirred at 25°C for 48 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chlonde solution (5 mL) The reaction mixture was poured into water (100 mL) and extracted with ethyl acetate (2 x 100 mL). The organics were washed with a saturated aqueous lithium chloride solution (2 x 50 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 95/5 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-phenyl-propionic acid ethyl ester (1.70 g, quant.) as a pale yellow oil: EI-HRMS m/e calcd for Cι6H22O2 (M+) 247.1698, found 247.1704.
A mixture of 3-cyclopentyl-2-phenyl-propionic acid ethyl ester (1.70 g, 7.06 mmol) and methyl urea (1.04 mg, 14.13 mmol) in a solution of magnesium methoxide in methanol (7.4 wt%, 130.3 mL, 21.18 mmol) was refluxed at 100°C for 24 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded l-(3-cyclopentyl-2-phenyl-propionyl)-3- methyl-urea (1.21 mg, 62.4 %) as a white solid: mp 145-147°C; EI-HRMS m/e calcd for C16H22N2O2 (M+) 274.1681, found 274.1682.
Example 133 l-[2-(4-Bromo-phenyl)-3-cyclopentyl-propionyl]-3-methyl urea
Figure imgf000263_0001
A solution of diisopropylamine (7.7 mL, 54.88 mmol) in dry tetrahydrofuran (23 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (10 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of π-butyllithium in hexanes (22.0 mL, 54.88 mmol). The reaction mixture was stirred at -78°C for 30 min and then treated dropwise with a solution of 4-bromophenylacetic acid (5.62 g, 26.13 mmol) in dry tetrahydrofuran (23 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (10 mL). The reaction mixture turned dark in color and was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (5.76 g, 27.44 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stirred for 24 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran. The aqueous residue was acidified using a 10% aqueous hydrochloric acid solution. The resulting aqueous layer was extracted with ethyl acetate (2 x 100 mL). The combined organic extracts were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(4-bromo- phenyl)-3-cyclopentyl-propionic acid (3.88 g, 50%) as a light yellow solid: mp 91-93°C; EI-HRMS m/e calcd for C14H17BrO2 (M÷) 296.0412, found 296.0417.
A solution of 2-(4-bromo-phenyl)-3-cyclopentyl-propionic acid (1.37 g, 4.61 mmol) in methanol (23 mL) was treated slowly with 5 drops of concentrated sulfuric acid. The resulting reaction mixture was heated under reflux for 42 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The residue was diluted with ethyl acetate (200 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 100 mL), washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 2-(4-bromo-phenyl)-3-cyclopentyl-propionic acid methyl ester (1.40 g, 97%) as a light yellow oil: EI-HRMS m/e calcd for C15H19BrO2 (M*) 310.0568, found 310.0569.
2-(4-Bromo-phenyl)-3-cyclopentyl-propionic acid methyl ester (420.0 mg, 1.35 mmol) and methyl urea (299.9 mg, 4.05 mmol) were treated with a solution of magnesium methoxide in methanol (7.4 wt%, 7.7 mL, 5.40 mmol). The resulting reaction mixture was then heated under reflux for 48 h. The reaction mixture was allowed to cool to 25°C and then filtered through celite. The celite was thoroughly washed with ethyl acetate, and the filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70- 230 mesh, 3/1 hexanes/ethyl acetate) afforded l-[2-(4-bromo-phenyl)-3-cyclopentyl- propionyl]-3-methyl urea (58.7 mg, 12%) as a white solid: mp 184-186°C; EI-HRMS m e calcd for d6H2ιBrN2O2 (M+) 352.0786, found 352.0791.
Example 134 l-[3-CycIopentyl-2-(4-trifluoromethylsulfanyl-phenyl)-propionyl]-3-methyl urea
Figure imgf000265_0001
A solution of diisopropylamine (2.4 mL, 16.80 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (2.5 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butyllithium in hexanes (6.7 mL, 16.80 mmol). The resulting reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of 4-(trifluoromethylthio)phenylacetic acid (1.89 g, 8.00 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyrimidinone (2.5 mL). The reaction mixture was allowed to stir at -78°C for 55 min, at which time, a solution of iodomethylcyclopentane (1.85 g, 8.80 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stirred for 41 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochloric acid solution and then extracted with ethyl acetate (1 x 300 mL). The organic layer was washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-trifluoromethylsulfanyl- phenyl)propionic acid (1.47 g, 58%) as a cream solid: mp 69-71°C; EI-HRMS m/e calcd for C15H17F3O2S (M+) 318.0901, found 318.0912.
A solution of 3-cyclopentyl-2-(4-trifluoromethylsulfanyl-phenyl)propionic acid (1.33 g, 4.18 mmol) in methanol (10 mL) was treated slowly with 4 drops of concentrated sulfuric acid. The resulting reaction mixture was heated under reflux for 36 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The residue was diluted with ethyl acetate (200 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 100 mL), washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 97/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-trifluoromethylsulfanyl- phenyl)propionic acid methyl ester (1.37 g, 99%) as a light yellow oil: EI-HRMS m/e calcd for d6Hι9F3O2S (MT) 332.1058, found 332.1052.
3-Cyclopentyl-2-(4-trifluoromethylsulfanyl-phenyl)propionic acid methyl ester (210.1 mg, 0.63 mmol) and methyl urea (140.5 mg, 1.90 mmol) were treated with a solution of magnesium methoxide in methanol (7.4 wt%, 3.6 mL, 2.53 mmol). The resulting reaction mixture was then heated under reflux for 64 h. The reaction mixture was allowed to cool to 25°C and then filtered through celite. The celite was thoroughly washed with ethyl acetate until the solvent passing through the celite showed absence of desired product by thin layer chromatography. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 1 -[3-cyclopentyl-2-(4-trifluoromethylsulfanyl-phenyl)-propionyl]-3-methyl urea (42.7 mg, 18%) as a white solid: mp 144-145°C; EI-HRMS m/e calcd for Cι7H2ιF3N2O2S (M+) 374.1276, found 374.1270. Example 135 1 - [3- Cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)-propionyl]-3-methyl urea
Figure imgf000267_0001
A solution of diisopropylamine (2 4 mL, 16 80 mmol) m dry tetrahydrofuran (7.5 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdmone (2.5 mL) was cooled to -78°C under nitrogen and then treated with a 2 5M solution of n-butyllithium in hexanes (6.7 mL, 16 80 mmol). The resulting reaction mixture was stiπed at -78°C for 30 mm and then treated dropwise with a solution of 4-(tnfluoromethylthιo)phenylacetιc acid (1.89 g, 8.00 mmol) in dry tetrahydrofuran (7.5 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyπmidmone (2.5 mL). The reaction mixture was allowed to stir at -78°C for 55 mm, at which time, a solution of lodomethylcyclopentane (1.85 g, 8.80 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stiπed for 41 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochlonc acid solution and then extracted with ethyl acetate (1 x 300 mL). The organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tπfluoromethylsulfanyl- phenyl)propιonιc acid (1.47 g, 58%) as a cream solid: mp 69-71°C; EI-HRMS m/e calcd for Cι5Hι7F3O2S (M+) 318.0901, found 318.0912.
A solution of 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl-phenyl)propιonιc acid (1.33 g, 4.18 mmol) in methanol (10 mL) was treated slowly with 4 drops of concentrated sulfunc acid The resulting reaction mixture was heated under reflux for 36 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The residue was diluted with ethyl acetate (200 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 100 mL), washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 97/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tnfluoromethylsulfanyl- phenyl)propιonιc acid methyl ester (1.37 g, 99%) as a light yellow oil: EI-HRMS m/e calcd for d6H19F3O2S (M+) 332 1058, found 332.1052
A solution of 3-cyclopentyl-2-(4-tπfluoromethylsulfanyl-phenyl)propιonιc acid methyl ester (1 14 g, 3 43 mmol) in methylene chloπde (8 6 mL) was treated with 3- chloroperoxybenzoic acid (80-85% grade, 2 00 g based on 80%, 9.26 mmol) The reaction mixture was stirred at 25°C for 17 h, at which time, thm layer chromatography showed the presence of two new lower Rf products An additional 2.00 g of 3- chloroperoxybenzoic acid was added to the reaction mixture to dnve the conversion of the sulfoxide to the sulfone, and the resultmg reaction mixture was stiπed at 25°C for 3 d. The reaction mixture was concentrated in vacuo to remove methylene chlonde The resulting residue was diluted with ethyl acetate (300 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 100 mL), washed with a saturated aqueous sodium chlonde solution (1 x 100 mL), dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-tnfluoromethanesulfonyl- phenyl)propιonιc acid methyl ester (1.19 g, 95%) as a light yellow oil: EI-HRMS m/e calcd for Cι6H19F3O4S (M+) 364.0956, found 364.0965
3-Cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)propιonιc acid methyl ester (383 8 mg, 1 05 mmol) and methyl urea (234 1 mg, 3.16 mmol) were treated with a solution of magnesium methoxide in methanol (7 4 wt%, 6.0 mL, 4.21 mmol). The resultmg reaction mixture was then heated under reflux for 2 d. The reaction mixture was allowed to cool to 25 °C and then filtered through celite. The celite was thoroughly washed with ethyl acetate until the solvent passing through the celite showed absence of desired product by thin layer chromatography. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2-(4-trifluoromethanesulfonyl-phenyl)-propionyl]-3-methyl urea (119.3 mg, 28%) as a white solid: mp 191-192°C; FAB-HRMS m/e calcd for C H2ιF3N2O4S (M+H)+ 407.1252, found 407.1247.
Example 136 l-[3-Cyclopentyl-2-(4-methylsulfanyl-phenyl)-propionyI]-3-methyl urea
Figure imgf000269_0001
A solution of diisopropylamine (3.2 mL, 23.16 mmol) in dry tetrahydrofuran (10.3 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (3.4 mL) was cooled to -78°C under nitrogen and then treated with a 10M solution of n-butyllithium in hexanes (2.3 mL, 23.16 mmol). The resulting reaction mixture was stirred at -78°C for 30 min and then treated dropwise with a solution of 4-(methylthio)phenylacetic acid (2.01 g, 11.03 mmol) in dry tetrahydrofuran (10.3 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)- pyrimidinone (3.4 mL). The reaction mixture was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (2.55 g, 12.13 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was stiπed at - 78°C for 30 min and then allowed to warm to 25°C where it was stirred for 24 h. The reaction mixture was quenched with water and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was acidified to pH = 2 with a 10% aqueous hydrochloric acid solution and then extracted with ethyl acetate (200 mL). The organic layer was washed with a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)propionic acid (1.01 g, 35%) as a cream solid: mp 91-93°C; EI-HRMS m/e calcd for Cι5H20O2S (M+) 264.1184, found 264.1177.
A solution of 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)propionic acid (500 mg, 1.89 mmol) in methanol (8 mL) was treated slowly with 2 drops of concentrated sulfuric acid. The resulting reaction mixture was heated under reflux for 15 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo. The orange residue was partitioned between water and ethyl acetate. The organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo to provide pure 3-cyclopentyl-2-(4- methylsulfanyl-phenyl)propionic acid methyl ester (481 mg, 91%) as a yellow-orange oil which was used without further purification: EI-HRMS m/e calcd for Cι6H22O2S (M+) 278.1341, found 278.1347.
3-Cyclopentyl-2-(4-methylsulfanyl-phenyl)propionic acid methyl ester (400 mg, 1.44 mmol) and methyl urea (267 mg, 3.60 mmol) were treated with a solution of magnesium methoxide in methanol (7.4 wt%, 5.6 mL, 3.89 mmol). The reaction mixture was then concentrated in vacuo to approximately one-half the volume of methanol. The resulting reaction mixture was then heated under reflux for 15 h. The reaction mixture was allowed to cool to 25°C, filtered through celite, and the celite was thoroughly washed with ethyl acetate. The ethyl acetate filtrate was washed with water. The organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-propionyl]-3-methyl urea (141 mg, 31%) as a white solid: mp 185-186°C; EI-HRMS m/e calcd for C17H24N2O2S (M , 320.1559, found 320.1559. Example 137 l-[3-Cyclopentyl-2-(4-methanesulfonyl-phenyl)-propionyl]-3-methyl urea
Figure imgf000271_0001
A solution of diisopropylamine (3.3 mL, 23.5 mmol) in dry tetrahydrofuran (50 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (10 mL) was cooled to -78°C under nitrogen and then treated with a 10M solution of n-butyllithium in hexanes (2.35 mL, 23.5 mmol). The yellow reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of 4-methylsulfonylphenylacetic acid (2.40 g, 11.2 mmol) in a small amount of dry tetrahydrofuran. After approximately one-half of the 4- methylsulfonylphenylacetic acid in dry tetrahydrofuran was added, a precipitate formed. Upon further addition of the remaining 4-methylsulfonylphenylacetic acid in dry tetrahydrofuran, the reaction mixture became thick in nature. After complete addition of the 4-methylsulfonylphenylacetic acid in dry tetrahydrofuran, the reaction mixture was very thick and became difficult to stir. An additional amount of dry tetrahydrofuran (20 mL) was added to the thick reaction mixture, and the reaction mixture was stiπed at - 78°C for 45 min, at which time, a solution of iodomethylcyclopentane (2.35 g, 11.2 mmol) in a small amount of dry tetrahydrofuran was added dropwise. The reaction mixture was allowed to warm to 25°C where it was stiπed for 15 h. The reaction mixture was quenched with water (100 mL), and the resulting yellow reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The aqueous residue was acidified to pH = 2 using concentrated hydrochloric acid. The aqueous layer was extracted with ethyl acetate. The organic phase was dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propionic acid (1.80 g, 52%) as a white solid: mp 152-154°C; EI-HRMS m/e calcd for Cι5H20O4S (M+) 296.1082, found 296.1080.
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-phenyl)propionic acid (500 mg, 1.89 mmol) in methanol (15 mL) was treated slowly with concentrated sulfuric acid (3 drops). The resulting reaction mixture was heated under reflux for 15 h. The reaction mixture was allowed to cool to 25 °C and then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2- (4-methanesulfonyl-phenyl)propionic acid methyl ester (377 mg, 72%) as a white solid: mp 63-66°C; EI-HRMS m/e calcd for C16H22O4S (MT) 310.1239, found 310.1230.
3-Cyclopentyl-2-(4-methanesulfonyl-phenyl)propionic acid methyl ester (350 mg, 1.13 mmol) and methyl urea (184 mg, 2.48 mmol) were treated with a solution of magnesium methoxide in methanol (7.4 wt%, 6.0 mL, 4.18 mmol). The reaction mixture was then concentrated in vacuo to approximately one-half the volume of methanol. The resulting reaction mixture was then heated under reflux for 15 h. The reaction mixture was allowed to cool to 25°C, filtered through celite, and the celite was thoroughly washed with ethyl acetate. The ethyl acetate filtrate was washed with water. The organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propionyl]-3-methyl urea (124 mg, 31%) as a white solid: mp 205-206°C; EI-HRMS m/e calcd for C17H2 N2O4S (M+) 352.1457, found 352.1445. Example 138 (A) l-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-ethyI-urea
Figure imgf000273_0001
A solution of triphenylphosphine (28.80 g, 109.8 mmol) and imidazole (14.9 g, 219.6 mmol) in methylene chloride (160 mL) was cooled to 0°C and then slowly treated with iodine (27.87 g, 109.8 mmol). The reaction mixture was then treated dropwise with a solution of cyclopentylmethanol (10.0 g, 99.8 mmol) in methylene chloride (10 mL). The resulting reaction mixture was allowed to warm to 25°C, where it was stirred for 4 h. The reaction mixture was then diluted with water (50 mL), and the reaction mixture was further extracted with methylene chloride (3 x 20 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo at 25°C. The resulting solid was washed with pentane (4 x 50 mL) and filtered through a silica gel plug. The filtrate was concentrated in vacuo at 25°C to afford iodomethylcyclopentane (18.48 g, 88%) as a clear colorless liquid: EI-HRMS m/e calcd for C6HπI (M+) 209.9906, found 209.9911.
A solution of diisopropylamine (13.36 mL, 101.89 mmol) in tetrahydrofuran (250 mL) was cooled to -78°C under a nitrogen atmosphere and then treated with a 2.0M solution of n-butyllithium in hexanes (51 mL, 101.89 mmol). The reaction mixture was stiπed at - 78°C for 15 min, at which time, a solution of 3,4-dichlorophenyl acetic acid (9.08 g, 44.3 mmol) in tetrahydrofuran (60 mL) and hexamethylphosphoramide (20 mL) was slowly added via a cannula. The bright yellow solution was allowed to stir at -78°C for 1 h, at which time, a solution of iodomethylcyclopentane (11.17 g, 53.2 mmol) in hexamethylphosphoramide (10 mL) was added via a cannula. The reaction mixture was stiπed at -78°C for 1 h. The reaction mixture was then allowed to warm to 25°C, where it was stiπed for 14 h. The reaction mixture was then acidified to pH = 2 by the dropwise addition of a IN aqueous hydrochlonc acid solution and extracted with ethyl acetate (3 x 50 mL) The combined organic layers were dned with sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, chloroform then 99/1 chloroform/methanol) afforded 3-cyclopentyl-2-(3,4- dιchlorophenyl)-propιomc acid (10.28 g, 81%) as a white solid: mp 74.5-76.9°C; EI- HRMS m/e calcd for Cι4H16Cl2O2 (M+) 286.0527, found 286.0534.
A solution of 3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonιc acid (366 mg, 1.27 mmol) in methylene chlonde (10 mL) and 1 drop of N,N-dιmethylformamιde was cooled to 0°C and then treated with a 2.0M solution of oxalyl chloπde in methylene chloπde (0.76 mL, 1.53 mmol) The reaction was stiπed for 30 mm at 0°C, at which time, 1,1,1,3,3,3- hexamethyldisilazane (0.81 mL, 3.81 mmol) was added to the reaction mixture. The reaction was allowed to slowly warm to 25°C and then stirred at 25°C for 16 h. The reaction mixture was then treated with methanol (5 mL). The resulting reaction mixture was washed with a 5% aqueous sulfuπc acid solution (2 x 10 mL). The combined aqueous layers were extracted with methylene chloπde (3 x 10 mL). The combined organic layers were then washed with a saturated aqueous sodium chlonde solution (1 x 10 mL), dned over magnesium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonamιde (229 mg, 63%) as a white solid: mp 98.6-100.1°C; EI-HRMS m/e calcd for C14H17Cl2ΝO (M+) 285.0687, found 285.0688
A solution of 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonamιde (98 mg, 0.33 mmol) m toluene (10 mL) was treated with ethyl isocyanate (0.03 mL, 0.42 mmol). The resulting solution was heated under reflux for 24 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl afforded l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-ethyl-urea (29 mg, 26%) as a white foam: EI-HRMS m/e calcd for C17H22Cl2N2O2 (M+) 356.1058, found 356.1066.
(B) In an analogous manner, there were obtained:
(a) From 3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide and isopropyl isocyanate: l-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-isopropyl-urea as a white solid: mp 134.6-138.3°C; EI-HRMS m/e calcd for C18H24Cl2N2O2 (M+) 370.1215, found 370.1232. (b) From 3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide and propyl isocyanate: 1- [3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-propyl-urea as a white solid: mp 117.8-120°C; EI-HRMS m/e calcd for Cι8H24Cl2N2O2 (M+) 370.1215, found 370.1209.
(c) From 3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide and ethyl 3- isocyanatopropionate: 3-{3-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}- propionic acid ethyl ester as a light yellow oil: EI-HRMS m/e calcd for C2oH26Cl2N2O (M+) 428.1270, found 428.1265.
(d) From 3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide and ethyl isocyanatoacetate: {3-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-acetic acid ethyl ester as a light yellow oil: EI-HRMS m/e calcd for Cι9H2 Cl2N O (M+) 414.1113, found 414.1108.
(e) From 3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide and allyl isocyanate: 1- Allyl-3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-urea as a clear colorless oil: EI-HRMS m/e calcd for d8H22Cl2N2O2 (M+) 368.1058, found 368.1064. Example 139 l-[3-Cyclopentyl-2(R)-(3,4-dichloro-phenyI)-propionyl]-3-methyl-urea
Figure imgf000276_0001
A solution of 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιomc acid (prepared in Example 12, 5.00 g, 17 4 mmol) in tetrahydrofuran (150 mL) cooled to -78°C was treated with tπethylamine (2.77 mL, 19.9 mmol) followed by tnmethylacetyl chlonde (2.24 mL, 18.2 mmol) The resulting white slurry was stiπed at -78°C for 15 mm and then at 0°C for 45 min. In a separate flask, a solution of (S)-4-ιsopropyl-2-oxazolιdιnone (2.14 g, 16.57 mmol) m tetrahydrofuran (80 mL) cooled to -78°C was treated with a 2.0M solution of n- butyllithium in hexanes (8.7 mL, 17.4 mmol). This solution was stirred at -78°C for 10 min. It was then warmed 25°C and stirred for an additional 10 mm. At this time, the first reaction mixture was re-cooled to -78°C. The second reaction mixture was added to the first reaction mixture over a penod of 5 mm via cannula. The combined reaction was then stiπed at -78 °C for 15 min. It was then warmed to 25°C and was stirred for an additional 1.5 h At this time, the reaction was quenched by the addition of a saturated aqueous sodium bisulfite solution (50 mL) and extracted with ethyl acetate (3 x 40 mL). The organic layers were combined, washed with a saturated aqueous sodium bicarbonate solution (1 x 20 mL), a saturated aqueous sodium chloπde solution (1 x 20 mL), dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Sihca gel 60, 230-400 mesh, 85/15 hexanes/ethyl acetate) afforded (1) 3-[3-cycloρentyl- 2(S)-(3,4-dιchloro-phenyl)-propιonyl]-4(S)-ιsopropyl-oxazohdιn-2-one (2.15 g, 33%) as a clear oil: [α]23 589 = +87.5° (c=0.160, chloroform); EI-HRMS m/e calcd for C20H25C12NO3 (M+) 397.1211, found 397.1215 and (2) 3-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)- propιonyl]-4(S)-ιsopropyl-oxazohdm-2-one (1.88 g, 28%) as a white solid: mp 71.9- 74.6°C; [α]23 589 = -27.6° (c=0.188, chloroform); EI-HRMS m/e calcd for C20H25C12NO3 (M +) 397.1211, found 397.1212.
A solution of 3-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-4(S)-isopropyl- oxazolidin-2-one (1.88 g, 4.72 mmol) in tetrahydrofuran (73 mL) and water (22 mL) cooled to 0°C was treated with a 30% aqueous hydrogen peroxide solution (2.1 mL) and lithium hydroxide (394 mg, 9.4 mmol). The reaction was stiπed at 0°C for 1 h. At this time, the reaction was quenched with a saturated aqueous sodium sulfite solution (16 mL) followed by the addition of an aqueous solution of 0.5N sodium bicarbonate (50 mL). The tetrahydrofuran was then removed in vacuo. The residue was diluted with water (40 mL) and extracted with methylene chloride (3 x 20 mL). The aqueous layer was then acidified to pH = 2 with a 5N aqueous hydrochloric acid solution and extracted with ethyl acetate (4 x 25 mL). The ethyl acetate layers were then dried over sodium sulfate, filtered, and concentrated in vacuo to afforded of 3-cyclopentyl-2(R)-(3,4-dichloro- phenyl)-propionic acid (928 mg, 70%) as a white solid: mp 75.1-78.3°C; [α]23 589 = -50.3° (c=0.100, chloroform); EI-HRMS m/e calcd for C14Hι6Cl2O2 (M+) 286.0527, found 286.0535.
A solution of 3-cyclopentyl-2(R)-(3,4-dichlorophenyl)-propionic acid (105 mg, 0.37 mmol) in methylene chloride (10 mL) and 1 drop of N,N-dimethylformamide was cooled to 0°C and then treated with a 2.0M solution of oxalyl chloride in methylene chloride (0.18 mL, 0.37 mmol). The reaction was stiπed for 30 min at 0°C, at which time, 1,1,1,3,3,3-hexamethyldisilazane (0.25 mL, 1.17 mmol) was added to the reaction mixture. The reaction was then allowed to slowly warm to 25°C and stirred at 25°C for 16h. The reaction mixture was then washed with a 5% aqueous sulfuric acid solution (2 x 10 mL). The combined aqueous layers were extracted with methylene chloride (3 x 10 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 10 mL), dried over magnesium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 60/40 hexanes/ethyl acetate) afforded 3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionamide (60 mg, 58%) as a white solid: [α]23 589 = -67.6° (c=0.106, chloroform); EI-HRMS m/e calcd for Ci4Hι7Cl2NιOι (M+) 285.0687, found 285.0685.
A solution of 3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionamide (54 mg, 0.19 mmol) in toluene (5 mL) was treated with methyl isocyanate (0.03 mL, 0.47 mmol). The resulting solution was heated under reflux for 24 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh 70/30 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]- 3-methyl-urea (40 mg, 63%) as a white solid: mp 124.8-127.5 °C; [ ]23 589 = -21.2° (c=0.099, chloroform); EI-HRMS m/e calcd for C16H20C12N2O2 (M+) 342.0902, found 342.0902.
Example 140 l-[3-Cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-propionyI]-3-methyl-urea
Figure imgf000278_0001
A solution of 4-chloro-3-nitrophenylacetamide (2.00 g, 9.32 mmol) in methanol (40 mL) was treated with Amberlyst® 15 ion exchange resin (15.00 g). The resulting reaction mixture was heated under reflux for 64 h. The reaction mixture was allowed to cool to 25°C and then filtered to remove the Amberlyst® 15 ion exchange resin. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 4-chloro-3-nitrophenylacetic acid methyl ester (1.91 g, 89%) as a yellow oil EI-HRMS m/e calcd for C9H8ClNO4 (M+) 229.0142, found 229 0146
A solution of diisopropylamine (3.35 mL, 23.9 mmol) in dry tetrahydrofuran (45 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdmone (15 mL) was cooled to -78°C and then treated dropwise with a 2.5M solution of n-butylhthium in hexanes (9.56 mL, 23.9 mmol) over a 10 mm penod The pale yellow reaction mixture was stiπed at -78°C for 20 min and then slowly treated with a solution of 4-chloro-3-nιtrophenylacetιc acid methyl ester (5 00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 mm penod The reaction mixture turned deep purple (almost black) in color The reaction mixture was then stiπed at -78°C for 1 h, at which time, a solution of lodomethylcyclopentane (4.58 g, 21.8 mol) in a small amount of dry tetrahydrofuran was added dropwise The reaction mixture was then stirred at -78°C and then allowed to warm to 25°C, where it was stiπed for 48 h. The reaction mixture was quenched with a saturated aqueous ammonium chloπde solution (50 mL), and the resultmg reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL) The organic phase was washed with a saturated aqueous sodium chloπde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(4-chloro-3-nιtrophenyl)-3-cyclopentyl- propiomc acid methyl ester (2 17 g, 32%) as a yellow oil: EI-HRMS m/e calcd for C15H18ClNO4 (M+) 311.0924, found 311 0927
A solution of 2-(4-chloro-3-nιtrophenyl)-3-cyclopentyl-propιomc acid methyl ester (1.00 g, 3.21 mmol) and sodium methanesulfinate (0.36 g, 3.53 mmol) in dimethyl sulfoxide (3 mL) was heated at 130°C for 5 h The black reaction mixture was then poured over ice (20 g), resulting in the formation of a brown sticky substance. The resulting mixture was then diluted with ethyl acetate (50 mL) and water (50 mL), and the layers were separated The aqueous layer was further extracted with ethyl acetate (2 x 50 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nitrophenyl)-propionic acid methyl ester (0.95 g, 84%) as a yellow gel: FAB-HRMS m/e calcd for C16H2ιNO6S (M+H)+ 356.1169, found 356.1175.
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-propionic acid methyl ester (865 mg, 2.43 mmol) in tetrahydrofuran (6 mL) was treated with a 0.8M aqueous lithium hydroxide solution (4.6 mL, 3.65 mmol). The reaction mixture was stiπed at 25°C for 3 h. The reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The resulting aqueous residue was diluted with water (25 mL) and then treated with a IN aqueous hydrochloric acid solution (10 mL). The resulting aqueous layer was then extracted with ethyl acetate (2 x 50 mL). The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/4 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nitrophenyl)-propionic acid (723 mg, 87%) as a white foam. Analytical data indicated the presence of a small impurity; however, the 3-cyclopentyl-2- (4-methanesulfonyl-3-nitrophenyl)-propionic acid was used without further purification in subsequent reactions.
A mixture of 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-propionic acid (300 mg, 0.88 mmol) and 1 drop of N,N-dimethylformamide in methylene chloride (2 mL) was cooled to 0°C and then slowly treated with oxalyl chloride (84 μL, 0.97 mmol). The reaction mixture was stirred at 0°C for 10 min and then stiπed at 25°C for 1 h. The resulting reaction mixture was then treated dropwise with 1,1,1,3,3,3- hexamethyldisilazane (560 μL, 2.64 mmol) and subsequently stirred at 25°C for 15 h. The resulting reaction mixture was diluted with methylene chloride (20 mL) and methanol (15 mL) and then washed with a 5% aqueous sulfuric acid solution (20 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-propionamide (140 mg, 47%) as a yellow foam: mp 72-76°C (foam to gel); FAB-HRMS m/e calcd for C] 5H20N2O5S (M+H)+ 341.1172, found 341.1181.
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-propionamide (126 mg, 0.37 mmol) and methyl isocyanate (211 mg, 3.70 mmol) in toluene (2 mL) was heated under reflux (120°C) for 15 h. The reaction mixture was allowed to cool to 25 °C and then concentrated in vacuo. The resulting yellow oil was treated with a small amount of a 1/1 mixture of hexanes/ethyl acetate, and a precipitate started to form. The material was further cooled in the freezer for 2 h to facilitate additional precipitation. The solid was collected by filtration and then dried in vacuo to afford l-[3-cyclopentyl-2-(4- methanesulfonyl-3-nitrophenyl)-propionyl]-3-methyl-urea (50 mg, 35%) as a pale yellow solid: mp 241-242°C; FAB-HRMS m/e calcd for d7H23N3O6S (M+H)+ 398.1386, found 398.1399.
Example 141 1 - [3- Cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl] -3-ethyl-urea
Figure imgf000281_0001
A solution of 3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionamide (prepared in Example 139, 103 mg, 0.36 mmol) in toluene (10 mL) was treated with ethyl isocyanate (40 μL, 0.54 mmol). The resulting reaction mixture was heated under reflux for 24 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2(R)- (3,4-dichloro-phenyl)-propionyl]-3-ethyl-urea (54 mg, 42%) as a white foam: [ ] 589 = -41.9° (c=0.031, chloroform); FAB-HRMS m/e calcd for C17H22Cl2N2O2 (M+H)+ 357.1136, found 357.1137.
Example 142 [2-(4-Chloro-phenyl)-4-methyl-pentanoyl]-urea
Figure imgf000282_0001
A solution of (4-chloro-phenyl)-acetic acid (6.29 g, 0.03 mol) in ethanol (38.4 mL) was treated with a catalytic amount of sulfuric acid. The reaction mixture was refluxed for 12 h. The reaction was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded (4-chloro-phenyl)-acetic acid ethyl ester (6.45 g, 88%) as a pale yellow solid: mp 39-41°C; EI-HRMS m/e calcd for doHπClOz (M+) 198.0448, found 198.0452.
A solution of freshly prepared lithium dusopropylamide (21.2 mL of a 0.3 IM stock solution, 6.14 mmol) cooled to -78°C was treated with (4-chloro-phenyl)-acetic acid ethyl ester (1.11 g, 5.58 mmol) in tetrahydrofuran/hexamethylphosphoramide (13.9 mL, 3:1). The resulting solution was stirred at -78°C for 45 min. At this time, the reaction was treated with a solution of l-bromo-2-methyl-propane (1.81 mL, 16.7 mmol) in hexamethylphosphoramide (1 mL). The mixture was stiπed at -78°C for 3 h. The reaction was then warmed to 25°C and was stiπed at 25°C for 16 h. The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloride solution (20 mL). The reaction mixture was poured into water (100 mL) and extracted with ethyl acetate (3 x 50 mL). The organics layers dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 2-(4-chloro-phenyl)-4-methyl-pentanoic acid ethyl ester (1.24 g, 87.1%) as a white solid: mp 34-35°C; EI-HRMS m/e calcd for d4H19C102 (M+) 254.1074, found 254.1069.
A mixture of 2-(4-chloro-phenyl)-4-methyl-pentanoic acid ethyl ester (508 mg, 1.99 mmol) and urea (239 mg, 3.99 mmol) in a solution of magnesium methoxide in methanol (7.4 wt%, 4.28 mL, 2.99 mmol) was heated to reflux for 24 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded [2-(4-chloro-phenyl)-4-methyl-pentanoyl]-urea (28.1 mg, 5.2%) as a white solid: mp 164-165°C; EI-HRMS m/e calcd for d3H17ClN2O2 (M+) 268.0979, found 268.0972.
Example 143 R-[2-(3,4-Dichloro-phenyl)-4-methyl-pentanoyl]-urea
Figure imgf000283_0001
A solution of (3,4-dichloro-phenyl)-acetic acid (10.0 g, 0.048 mol) in ethanol (50 mL) was treated with a catalytic amount of sulfuric acid. The reaction mixture was refluxed for 7 h. The reaction was concentrated in vacuo, diluted with diethyl ether, and poured into water. The ether layer was washed with a saturated aqueous sodium bicarbonate solution and water. The organics were then dried over sodium sulfate, filtered, and concentrated in vacuo. Vacuum distillation (bath temperature: 175°C; head temperature: 125°C) afforded (3,4-dichloro-phenyl)-acetic acid ethyl ester (9.38 g, 82.5%) as a clear oil: EI-HRMS m/e calcd for C10HιoCl2O2 (M+) 232.0058, found 232.0066. A solution of freshly prepared lithium dusopropylamide (4.88 mL of 0.29M stock solution, 1.41 mmol) cooled to -78°C was treated with (3,4-dιchloro-phenyl)-acetιc acid ethyl ester (300 mg, 1.28 mmol) m tetrahydrofuran/hexamethylphosphoramide (3 2 mL, 3 1) The resulting solution was stirred at -78°C for 45 mm At this time, the reaction was treated with a solution of l-bromo-2-methyl-propane (1.53 mL, 1.41 mmol) in hexamethylphosphoramide (1 mL) The reaction mixture was stiπed at -78°C for 6 h The reaction was then warmed to 25°C and stiπed at 25°C for 16 h The reaction mixture was then quenched by the dropwise addition of saturated aqueous ammonium chlonde solution (1 mL) This mixture was poured into water (50 mL) and extracted with ethyl acetate (3 x 50 mL) The organics were dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 2-(3,4-dιchloro-phenyl)-4-methyl-pentanoιc acid ethyl ester (356.4 mg, 95.8%) as a clear oil: EI-HRMS m/e calcd for d4Hι8Cl2O2 (MT) 288.0683, found 288.0677
A mixture of 2-(3,4-dιchloro-phenyl)-4-methyl-pentanoιc acid ethyl ester (197 mg, 0.68 mmol) and urea (82 mg, 1.36 mmol) in a solution of magnesium methoxide methanol (7 4 wt%, 1 46 mL, 1.02 mmol) was heated to reflux for 3 h The reaction mixture was then concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) followed by high pressure liquid chromatography [Chirobiotic T, 5μM, 25cm x 4.6mm ID, 60/40 buffer (0.1% tnethylamme in water titrated to pH 5 with glacial acetic acιd)/ethanol] afforded R-[2-(3,4-dιchloro-phenyl)-4- methyl-pentanoyl]-urea (120.0 mg, 58.1%) as a white solid mp 138-140°C; EI-HRMS m/e calcd for C,3H16Cl2N2O2 (M+) 302.0589, found 302.0595. Example 144 l-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionyI]-3-(2-hydroxy-ethyl)-urea
Figure imgf000285_0001
A solution of l-allyl-3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-urea (prepared in Example 12B-e, 75 mg, 0.20 mmol) in dry methylene chloride (10 mL) and methanol (2 drops, needed to solubilize the compound) was cooled to -78°C and deoxygenated by bubbling argon through the reaction mixture. Ozone was then generated and bubbled through the reaction until a blue color appeared and then the reaction was stirred for five min. At this time, argon was bubbled through the solution again until the blue color disappeared. Triphenylphosphine (54 mg, 0.20 mmol) was then added and the reaction warmed to 25°C and stirred for 16 h. At this time, the reaction was concentrated in vacuo and then dissolved in dry methanol (10 mL). The reaction was cooled to 0°C and then slowly treated with sodium borohydride (31 mg, 0.81 mmol). The reaction was then warmed to 25°C and stirred for 1 h. It was then quenched with water (10 mL) and extracted with ethyl acetate (3 15 mL). The organics were combined and washed with water (1 x 15 mL), a saturated aqueous sodium chloride solution (1 x 15 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2-(3,4- dichloro-phenyl)-propionyl]-3-(2-hydroxy-ethyl)-urea (48 mg, 64%) as a hygroscopic white solid: EI-HRMS m/e calcd for d7H22Cl2N2O3 (M +) 370.1215, found 370.1209. Example 145 l-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-(2-hydroxy-propyl)-urea
Figure imgf000286_0001
A solution of l-allyl-3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea (prepared m Example 12B-e, 132 mg, 0.36 mmol) in tetrahydrofuran (10 mL) cooled to 0°C was treated with a IM solution of borane-tetrahydrofuran (0.7 mL, 0.72 mmol). The reaction mixture was allowed to warm from 0°C to 25°C over 1 h. At this time, the solution was re-cooled to 0°C and treated with ethanol (2 mL) followed by the slow addition of a mixture of a saturated aqueous sodium bicarbonate solution (6 mL) and 30% hydrogen peroxide (2 mL) The resulting mixture was allowed to slowly warm to 25°C over 1 h. At this time, the reaction was re-cooled to 0°C and was slowly quenched with a saturated aqueous sodium sulfite solution (20 mL). This mixture was extracted with ethyl acetate (3 x 20 mL). The organics were washed with a saturated aqueous sodium chloπde solution (1 x 15 mL), dπed over sodium sulfate, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) effected the separation of two spots, the first of the two product spots to elute off the column afforded l-[3- cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-3-(2-hydroxy-propyl)-urea (36 mg, 26%) as a white solid: mp 116.7-119.9°C; EI-HRMS m/e calcd for C18H24Cl2N2O3 (M+) 386.1164, found 386.1173. Example 146 l-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-(3-hydroxy-propyI)-urea
Figure imgf000287_0001
A solution of l-allyl-3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-urea (prepared in Example 12B-e, 132 mg, 0.36 mmol) in tetrahydrofuran (10 mL) cooled to 0°C was treated with a IM solution of borane-tetrahydrofuran (0.7 mL, 0.72 mmol). The reaction mixture was allowed to slowly warm from 0°C to 25°C over 1 h.. At this time, the solution was re-cooled to 0°C and ethanol (2 mL) followed by a mixture of a saturated aqueous sodium bicarbonate solution (6 mL) and 30% hydrogen peroxide (2 mL) was added slowly. This mixture was allowed to slowly warm to 25°C while stirring for 1 h. At this time, the reaction was re-cooled to 0°C and slowly quenched with a saturated aqueous sodium sulfite solution (20 mL). This solution was extracted with ethyl acetate (3 x 20 mL). The organics were washed with a saturated aqueous sodium chloride solution (1 x 15 mL), dried over sodium sulfate, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) effected the separation of two spots, the second of the two product spots to elute off the column afforded l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-(3-hydroxy- propyl)-urea (73 mg, 53%) as a white hygroscopic solid: EI-HRMS m/e calcd for C18H24Cl2N2O3 (M+) 386.1164, found 386.1172. Example 147
{3-[3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionyI]-ureido}-acetic acid methyl ester
Figure imgf000288_0001
A solution of {3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-acetic acid ethyl ester (prepared in Example 12B-d, 77 mg, 0.19 mmol) in ethanol (5 mL) at 25°C was treated with a solution of potassium hydroxide (36 mg, 0.65 mmol) in water (1 mL). The reaction mixture was stiπed at 25 °C for 2 h. At this time, the reaction was diluted with water (5 mL) and the ethanol was removed in vacuo. The aqueous layer was then acidified to pH = 2 with a IN aqueous hydrochloric acid solution and extracted with methylene chloride (3 x 15 mL). The organics were then dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 88/12 chloroform/methanol plus 1% acetic acid) afforded {3-[3-cyclopentyl-2-(3,4- dichloro-phenyl)-propionyl]-ureido} -acetic acid (43 mg, 60%) as a white solid: mp 204.2- 206.8°C; EI-HRMS m/e calcd for C17H20C12N2O4 (VT) 386.0800, found 386.0795.
A solution of {3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-acetic acid (30 mg, 0.08 mmol) in methanol (5 mL) was treated with concentrated sulfuric acid (4 drops). The reaction was heated to 80°C for 8 h. At this time, the reaction was cooled to 25°C and diluted with water (lOmL). This solution was extracted with ethyl acetate (3 x 20 mL). The organics were washed with a saturated aqueous sodium bicarbonate solution (1 x 20 mL), a saturated aqueous sodium chloride solution (1 x 20 mL) and water (1 x 10 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded {3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-acetic acid methyl ester (21 mg, 68%) as a white solid: mp 134.5-136.6°C; EI-HRMS m/e calcd for C,8H22Cl2N2O4 (M+) 400.0957, found 400.0970.
Example 148
3-{3-[3-CycIopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-propionic acid methyl ester
Figure imgf000289_0001
A solution of 3-{3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-propionic acid ethyl ester (prepared in Example 12B-C, 94 mg, 0.22 mmol) in ethanol (5 mL) at 25 °C was treated with a solution of potassium hydroxide (43 mg, 0.77 mmol) in water (1 mL). This solution was stiπed at 25°C for 2 h. At this time, the reaction was diluted with water (5 mL) and the ethanol was removed in vacuo. The aqueous layer was acidified to pH = 2 with a IN aqueous hydrochloric acid solution and extracted with methylene chloride (3 x 15 mL). The organic layers were then dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate plus 1% acetic acid) afforded 3-{3-[3-cyclopentyl-2-(3,4- dichloro-phenyl)-propionyl]-ureido}-propionic acid (30 mg, 35%) as a white foam: FAB- HRMS m/e calcd for C18H22Cl2N2O4 (M+H)+ 401.1035, found 401.1022.
A solution of 3-{3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-propionic acid (20 mg, 0.05 mmol) in methanol (5 mL) was treated with concentrated sulfuric acid (4 drops). This solution was heated to 80°C for 8 h. At this time, the reaction was cooled to 25°C and diluted with water (lOmL). This solution extracted with ethyl acetate (3 x 20 mL). The organics were washed with a saturated aqueous sodium bicarbonate solution (1 x 20 mL), a saturated aqueous sodium chloride solution (1 x 20 mL) and water (1 x 10 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 3-{3-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-ureido}-propionic acid methyl ester (18 mg, 86%) as a white solid: 93.6-95.8°C: EI-HRMS m e calcd for Cι9H24Cl2N2O4 (M+) 414.1113, found 414.1114.
Example 149
{3-[3-Cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-ureido}-acetic acid ethyl ester
Figure imgf000290_0001
A solution of 3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionamide (prepared in Example 13, 600 mg, 2.10 mmol) in toluene (15 mL) was treated with ethyl isocyantoacetate (0.35 mL, 3.14 mmol). This solution was heated under reflux for 16 h. At this time, the reaction was cooled to 25°C and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded { 3-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-ureido }-acetic acid ethyl ester (525 mg, 60%) as a colorless oil; [α]23 589 = -27.4° (c=0.113, chloroform); EI- HRMS m/e calcd for Cι9H24Cl2N2O4 (M+) 414.1113, found 414.1123. Example 150 l-Allyl-3-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyI)-propionyI]-urea
Figure imgf000291_0001
A solution of 3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionamide (prepared in Example 13, 1.02 g, 3.55 mmol) in toluene (30 mL) was treated with allyl isocyanate (0.47 mL, 5.33 mmol). This solution was heated to reflux for 16 h. At this time, the reaction was cooled to 25°C and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded l-allyl-3-[3- cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-urea (1.06 g, 81%) as a colorless oil: [α]23 589 = -25.2° (c=0.151, chloroform); EI-HRMS m/e calcd for C18H22Cl2N2O2 (M+) 368.1058, found 368.1054.
Example 151 l-[3-Cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyI]-3-(2-hydroxy-propyl)-urea
Figure imgf000291_0002
A solution of l-allyl-3-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-urea (prepared in Example 24, 765 mg, 2.07 mmol) in tetrahydrofuran (50 mL) cooled to 0°C was treated with a l.OM borane solution in tetrahydrofuran (4.14 mL, 4.14 mmol). The reaction was allowed to warm from 0°C to 25°C over 1 h. At this time, the reaction was re-cooled to 0°C and treated with ethanol (15 mL) followed by a mixture of a saturated aqueous sodium bicarbonate solution (45 mL) and hydrogen peroxide (15 mL). The resulting mixture was allowed to warm from 0°C to 25°C over 1 h. The reaction was then slowly quenched with a saturated aqueous sodium sulfite solution and then extracted with ethyl acetate (3 x 30 mL). The organics were washed with a saturated aqueous sodium chloride solution (1 x 20 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-3-(2-hydroxy- propyl)-urea (103 mg, 11%) as a white foam: [α]23 589 = -33.0° (c=0.094, chloroform); EI- HRMS m/e calcd for C18H24Cl2N2O3 (M+) 386.1164, found 386.1151.
Example 152 l-[3-Cyclopentyl-2(R)-(3,4-dichloro-pheny!)-propionyl]-3-(3-hydroxy-propyI)-urea
Figure imgf000292_0001
A solution of l-allyl-3-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-urea (prepared in Example 24, 765 mg, 2.07 mmol) in tetrahydrofuran (50 mL) cooled to 0°C was treated with a l.OM borane solution in tetrahydrofuran (4.14 mL, 4.14 mmol). The reaction was allowed to warm from 0°C to 25°C over 1 h. At this time, the reaction was re-cooled to 0°C and treated with ethanol (15 mL) followed by a mixture of a saturated aqueous sodium bicarbonate solution (45 mL) and hydrogen peroxide (15 mL). The resulting mixture was allowed to warm from 0°C to 25°C over 1 h. The reaction was then slowly quenched with a saturated aqueous sodium sulfite solution and then extracted with ethyl acetate (3 x 30 mL). The organics were washed with a saturated aqueous solution of sodium chloride (1 x 20 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionyl]-3-(3-hydroxy- propyl)-urea (173 mg, 22%) as a white foam: [α]23 589 = -37.3° (c=0.075, chloroform); EI- HRMS m/e calcd for Cι8H24Cl2N2O3 (M+) 386.1164, found 386.1154.
Example 153 l-[2-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea
Figure imgf000293_0001
A solution of aluminum trichloride (34.8 g, 261.4 mmol) in chloroform (120 mL) cooled to 0°C was treated with a solution of ethyl chlorooxoacetate (18.7 mL, 167.5 mmol) in chloroform (120 mL). The mixture was stirred at 0°C for 30 min. At this time, a solution of 2-chlorothioanisole (25.0 g, 156.5 mmol) in chloroform (120 mL) was added dropwise to the reaction mixture. It was then allowed to warm to 25°C and stiπed for an additional 3.5 h at 25°C. At this time, the reaction was quenched by the slow addition of water (500 mL) and extracted with chloroform (3 x 50 mL). The organics were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded (3-chloro-4-methylsulfanyl-phenyl)- oxo-acetic acid ethyl ester (31.37 g, 77%) as a yellow oil: EI-HRMS m e calcd for C18H24Cl2N2O3 (M+) 386.1164, found 386.1154.
A solution of cylcopentylmethyl triphenylphosphonium iodide (prepared in Example 33, 725 mg, 1.53 mmol) in tetrahydrofuran (10 mL) cooled to 0°C was treated with a l.OM solution of sodium bis(trimethylsilyl)amide in tetrahydrofuran (2.14 mL, 2.14 mmol). The reaction was stiπed at 0°C for 45 m . At this time, the reaction was treated with a solution of (3-chloro-4-methylsulfanyl-phenyl)-oxo-acetιc acid ethyl ester (355 mg, 1.37 mmol) in tetrahydrofuran (5 mL). The reaction was then warmed to 25°C and stiπed at 25°C for 20 h The reaction was then diluted with water (50 mL) and extracted with diethyl ether (3 x 25 mL). The organics were dned over sodium sulfate, filtered, and concentrated in vacuo Biotage chromatography (FLASH 12M, Silica, 80/20 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methylsulfanyl-phenyl)-3-cyclopentyl- acryhc acid ethyl ester (267 mg, 60%, 2: 1 mixture of E:Z isomers) as a yellow oil and taken on without charactenzation
A solution of E:Z isomers of 2-(3-chloro-4-methylsulfanyl-phenyl)-3-cyclopentyl-acryhc acid ethyl ester (100 mg, 0.31 mmol) methylene chloπde (5 mL) cooled to 0°C was treated with 3-chloroperoxybenzoic acid (80%, 157 mg, 0 73 mmol) and stiπed for 3.5 h. The reaction mixture was then diluted with methylene chloπde (25 mL) This solution was washed with a saturated aqueous sodium carbonate solution (2 x 10 mL) and a saturated aqueous sodium chlonde solution (2 x lOmL). The organics were dned over sodium sulfate, filtered, and concentrated in vacuo Biotage chromatography (FLASH 12M, Silica, 80/20 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methanesulfonyl- phenyl)-3-cyclopentyl-acryhc acid ethyl ester (95 mg, 86%, 2:1 mixture of E:Z isomers) as a colorless oil and taken on without charactenzation.
A solution of E:Z isomers of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- acryhc acid ethyl ester (1.04 g, 2.91 mmol), nickel chloride hexahydrate (69 mg, 0.29 mmol) in methanol (25 mL) cooled to 0°C was treated with sodium borohydnde (221 mg, 5.83 mmol) at a rate to maintain the reaction temperature below 20°C. After complete addition of the sodium borohydnde, the reaction was stiπed at 25°C for 1.5 h. At this time, the reaction was filtered through celite and washed with methanol. The filtrate was concentrated in vacuo. The residue was diluted with water (15 mL) and extracted with ethyl acetate (3 x 15 mL). The organics were dπed over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded a mixture of 2-(3-chloro-4-methanesulfonyl-phenyl)-3- cyclopentyl-propionic acid methyl ester and 2-(3-chloro-4-methanesulfonyl-phenyl)-3- cyclopentyl-propionic acid ethyl ester (transesterification occuπed under the reaction conditions) (937 mg) as a clear colorless oil. (Transesterification occuπed under the reaction conditions and the mixture of esters was carried on without characterization)
A solution of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid methyl ester and 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid ethyl ester (268 mg) and methyl urea (110 mg, 1.5 mmol) in magnesium methoxide in methanol (7.4 wt%, 1.6 mL, 1.1 mmol) was heated to 100°C for 8 h. At this time, the reaction was concentrated in vacuo. The residue was then dissolved in ethyl acetate (50 mL), filtered through a plug of silica gel, and washed with ethyl acetate (100 mL). The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 60/40 hexanes/ethyl acetate) afforded l-[2-(3-chloro-4-methanesulfonyl-phenyl)-3- cyclopentyl-propionyl]-3-methyl-urea (55 mg, 19% yield) as a white foam: FAB-HRMS m/e calcd for C17H23ClN2O4S (M+H)* 387.1145, found 387.1156.
Example 154 l-[2-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionyl]-3-ethyl-urea
Figure imgf000295_0001
A solution of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid methyl ester and 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid ethyl ester (prepared in Example 27, 937 mg) in ethanol (30 mL) at 25°C was treated with a solution of potassium hydroxide (733 mg, 13.1 mmol) in water (7 mL). This solution was stiπed at 25°C for 3 h. At this time, the reaction mixture was concentrated in vacuo. The residue was acidified to pH = 2 by treatment with a IN aqueous hydrochlonc acid solution. This solution was then extracted with methylene chlonde (3 x 15 mL). The organics were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate plus 1% acetic acid) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιomc acid (787 mg, 82% over two steps) as a white solid: mp 123.9-126.2°C; FAB-HRMS m/e calcd for C,5H19ClO4S (M+H)+ 331.0771, found 331.0776.
A solution of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (147 mg, 0.44 mmol) in toluene (5 mL) with N,N-dιmethylformamιde (2 drops) at 25 °C was treated with oxalyl chlonde (0.05 mL, 0.53 mmol). The reaction was stiπed at 25°C for 30 m . At this time, the reaction was cooled to -60°C and treated with ammonium hydroxide (0.50 mL, 3.8 mmol). The resulting suspension was allowed to warm to 25°C and stiπed at 25°C for 1 h. At this time, the reaction was quenched by the addition of a 2Ν aqueous hydrochlonc acid solution (1 mL) and then extracted with diethyl ether (3 x 25 mL) The organics were dned over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 65/35 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonamιde (130 mg, 89%) as a white foam: EI-HRMS m/e calcd for C15H20C1NO3S (M+) 329.0852, found 329.0852.
Example 155
l-[2(R)-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionyl]-3-methyl urea
Figure imgf000297_0001
A solution of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (prepared in Example 28, 6.1 g, 18.3 mmol), (R)-(+)-4-benzyl-2-oxazolidinone (2.83g, 15.9 mmol), triethylamine (6.68 mL, 47.7 mmol), in toluene (50 mL) heated to 80°C was treated with pivaloyl chloride (3.55 mL, 28.8 mmol) in toluene (10 mL). The resulting slurry was heated at 80°C for 36 h. At this time, the reaction was cooled to 20°C and concentrated in vacuo. The residue was diluted with ethyl acetate (150 mL) washed with a IN aqueous hydrochloric acid solution (100 mL), a 10% aqueous sodium carbonate solution (100 mL), and a saturated aqueous sodium chloride solution (100 mL). The organics were dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/5/5 methylene chloride/hexanes/ethyl acetate) afforded 4(R)-benzyl-3-[2(S)-(3-chloro-4- methanesulfonyl-phenyl)-3-cyclopentyl-propionyl]-oxazolidin-2-one (2.08 g, 23%) as a white foam: [α]23 589 = +10.4° (c=0.144, chloroform); FAB-HRMS m/e calcd for C25H28ClNO5S (M+H)+ 490.1455, found 490.1457 and 4(R)-benzyl-3-[2(R)-(3-chloro-4- methanesulfonyl-phenyl)-3-cyclopentyl-propionyl]-oxazolidin-2-one (2.20 g, 25%) as a white foam: [α]23 589 = -93.9° (c=0.165, chloroform); FAB-HRMS m/e calcd for C25H28ClNO5S (M+H)+ 490.1455, found 490.1443.
A solution of lithium hydroxide (215 mg, 9.0 mmol) in water (2.8 mL) was treated with a 30% aqueous solution of hydrogen peroxide (2.0 mL, 18 mmol). This lithium hydroperoxide solution was cooled to 0°C and was then slowly added to a solution of 4(R)-benzyl-3-[2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonyl]- oxazohdm-2-one (2.20 g, 4.5 mmol) in tetrahydrofuran (18 mL) and water (5.8 mL) cooled to 0°C The reaction was stirred at 0°C for 1.5 h. At this time, the reaction was quenched with a 1.5N aqueous sodium sulfite solution (25 mL) and was further diluted with water (150 mL) This solution was extracted with diethyl ether (3 x 50 mL). The aqueous layer was then acidified to pH = 2 with a IN aqueous hydrochlonc acid solution and extracted with ethyl acetate (3 x 50 mL) The organics were dned over sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate plus 1% acetic acid) afforded 2(R)-(3-chloro- 4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (1.26 g, 85%) as a white solid mp 106.1-108.8°C, [α]23 589 = -43 0° (c=0.172, chloroform); EI-HRMS m/e calcd for Cι5H19ClO4S (M+) 330.0692, found 330.0690
A solution of 2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl -propionic acid (200 mg, 0.61 mmol) m toluene (4.8 mL) and N,N-dιmethylformamιde (12 μL) at 25°C was treated with a 2.0 M solution of oxalyl chloπde in methylene chlonde (0.36 mL, 0.73 mmol) This solution was stiπed at 25°C for 30 mm At this time, the reaction was cooled to -60°C and treated dropwise with a 30% aqueous ammonium hydroxide solution (0.59 mL, 5.24 mmol) The resultmg suspension was allowed to gradually warm to 25°C and stiπed at 25 °C for 1 h. The reaction mixture was then extracted with ethyl acetate (3 x 25 mL) The organics were dned over magnesium sulfate, filtered and concentrated in vacuo Flash chromatography (Biotage Flash 40S column, ethyl acetate) afforded 2(R)- (3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonamιde (175 mg. 88%) as a colorless oik [α]23 589 = -45.8° (c=0.096, chloroform); EI-HRMS m/e calcd for C15H20C1ΝO3S (M+) 329.0852, found 329.0851
A solution of 2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonamιde (160 mg, 0.49 mmol) in toluene (5 mL) was treated with methyl isocyanate (0.12 mL, 1.94 mmol). The reaction mixture was then heated at 100°C for 16 h. At this time, the reaction was concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 60/40 hexanes/ethyl acetate) afforded l-[2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3- cyclopentyl-propionyl]-3-methyl-urea (79 mg, 42%) as a white foam: [ ]23 589 = -8.9° (c=0.09, chloroform); FAB-HRMS m/e calcd for C.^CINAS (M+H)+ 387.1145, found 387.1142.
Example 156
l-(2-Chloro-ethyI)-3-[3-cyclopentyl-2-(3,4-dichlorophenyl)-propionyI]-urea
Figure imgf000299_0001
A solution of 3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide (prepared in Example 12, 182 mg, 0.64 mmol) in toluene (10 mL) was treated with 2-chloroethyl isocyanate (0.08 mL, 0.95 mmol). The reaction was heated at reflux for 16 h. At this time, the reaction was cooled to 25°C and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded l-(2-chloro-ethyl)-3- [3-cyclopentyl-2-(3,4-dichlorophenyl)-propionyl]-urea (189 mg, 76%) as a colorless oil: EI-HRMS m/e calcd for d7H21Cl3N2O2 (M j 390.0669, found 390.0659.
Example 157 l-[3-CyclopentyI-2-(3-trifluoromethanesulfonyl-phenyl)-propionyI]-3-methyl-urea
Figure imgf000300_0001
A solution of 3-(tπfluoromethylthιo)phenylacetιc acid (5.00 g, 21.17 mmol) in methanol (50 mL) was treated slowly with concentrated sulfunc acid (10 drops) The resulting reaction mixture was heated to reflux for 18 h. The reaction mixture was allowed to cool to 25 °C and then concentrated in vacuo to remove methanol The residue was diluted with ethyl acetate (100 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 100 mL), dned over magnesium sulfate, and filtered The filtrate was concentrated in vacuo to afford crude (3-tnfluoromethylsulfanyl -phenyl)- acetic acid methyl ester (5.28 g, 99%) as a pale yellow oil which was used without further punfication: EI-HRMS m/e calcd for C10H9F3O2S (M+) 250.0275, found 250.0274.
A solution of diisopropylamine (1.5 mL, 10.5 mmol) in dry tetrahydrofuran (27 mL) and l,3-dιmethyl-3,4,5,6-tetrahydro-2(lH)-pynmιdmone (8 mL) cooled to -78°C was treated with a 2.5M solution of n-butyllithium in hexanes (4.2 mL, 10.5 mmol). The resulting reaction mixture was stiπed at -78°C for 30 mm and then treated dropwise with a solution of (3-tπfluoromethylsulfanyl-phenyl)-acetιc acid methyl ester (2.50 g, 10.0 mmol) in a small amount of tetrahydrofuran. The reaction mixture was allowed to stir at -78°C for 1 h. At this time, the reaction was treated with a solution of iodomethylcyclopentane (2.10 g, 10.0 mmol) in a small amount of dry tetrahydrofuran. The reaction mixture was allowed to warm to 25°C where it was stirred for 15 h. The reaction mixture was quenched with water (50 mL) and then partitioned between water (75 mL) and ethyl acetate (75 mL). The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 8/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3-trifluoromethylsulfanyl-phenyl)- propionic acid methyl ester (2.95 g, 89%) as a colorless oil: EI-HRMS m/e calcd for C16H19F3O2S (M+) 332.1058, found 332.1047.
A solution of 3-cyclopentyl-2-(3-tπfluoromethylsulfanyl-phenyl)-propιonιc acid methyl ester (2.75 g, 8.27 mmol) in methylene chloπde (30 mL) was treated with 3- chloroperoxybenzoic acid (80-85% grade, 4.28 g based on 80%, 20.67 mmol). The reaction mixture was stiπed at 25°C for 6 h At this time, thm layer chromatography showed the presence of two new lower Rf products. An additional 4.00 g of 3- chloroperoxybenzoic acid was added to the reaction mixture to dnve the conversion of the sulfoxide to the sulfone, and the resulting reaction mixture was stirred at 40°C for 3 d. The reaction mixture was cooled to 25°C and then partitioned between water (100 mL) and methylene chloπde (100 mL). The layers were shaken and separated. The organic phase was washed twice with a saturated aqueous sodium bicarbonate solution, washed with water, dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/methylene chloπde) afforded 3-cyclopentyl-2-(3-tπfluoromethanesulfonyl-phenyl)-propιomc acid methyl ester (2 07 g, 69%) as a colorless oil: EI-HRMS m/e calcd for C16H19F3O4S (M+) 364.0956, found 364.0947
3-Cyclopentyl-2-(3-tnfluoromethanesulfonyl-phenyl)-propιonιc acid methyl ester (500 mg, 1.37 mmol) and methyl urea (305 mg, 4.12 mmol) were treated with a solution of magnesium methoxide in methanol (7.4 wt%, 5.9 mL, 4.12 mmol). The reaction mixture was then concentrated in vacuo to approximately one-half the volume of methanol. The resulting reaction mixture was then heated under reflux for 15 h. The reaction mixture was allowed to cool to 25°C, diluted with ethyl acetate (10 mL), and then filtered through celite. The celite was thoroughly washed with ethyl acetate. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2-(3-trifluoromethanesulfonyl-phenyl)- propionyl]-3-methyl-urea (253 mg, 45%) as a white foam: mp 59-62°C (foam to gel); EI- HRMS m/e calcd for Cι7H2ιF3N2O4S (M+) 406.1174, found 406.1178.
Example 158 l-[3-CycIopentyl-2-(3-fluoro-4-trifluoromethyl-phenyl)-propionyl]-3-methyl-urea
Figure imgf000302_0001
A solution of 3-fluoro-4-(trifluoromethyl)phenylacetic acid (2.50 g, 11.25 mmol) in methanol (25 mL) was treated with concentrated sulfuric acid (4 drops). The resulting reaction mixture was heated under reflux for 15 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded (3-fluoro-4- trifluoromethyl-phenyl)-acetic acid methyl ester (2.58 g, 97%) as a colorless oil: EI- HRMS m/e calcd for Cι0H8F4O2 (M+) 236.0460, found 236.0457.
A solution of diisopropylamine (1.5 mL, 10.67 mmol) in dry tetrahydrofuran (24 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (8 mL) cooled to -78°C was treated with a 2.5M solution of n-butyllithium in hexanes (4.3 mL, 10.67 mmol). The resulting reaction mixture was stirred at -78°C for 45 min and then treated dropwise with a solution of (3-fluoro-4-trifluoromethyl-phenyl)-acetic acid methyl ester (2.40 g, 10.16 mmol) in a small amount of tetrahydrofuran. The reaction mixture was allowed to stir at -78°C for 1 h. At this time, the reaction was treated with a solution of iodomethylcyclopentane (2.24 g, 10.67 mmol) in a small amount of dry tetrahydrofuran. The reaction mixture was allowed to warm to 25°C where it was stiπed for 15 h. The reaction mixture was quenched with a saturated aqueous ammonium chloride solution (10 mL) and then partitioned between water (75 mL) and ethyl acetate (75 mL). The layers were shaken and separated. The aqueous layer was further extracted with ethyl acetate (75 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 5/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2- (3-fluoro-4-trifluoromethyl-phenyl)-propionic acid methyl ester (2.69 g, 83%) as a colorless oil: EI-HRMS m/e calcd for d6Hι8F4O2 (MT) 318.1243, found 318.1250.
3-Cyclopentyl-2-(3-fluoro-4-trifluoromethyl-phenyl)-propionic acid methyl ester (750 mg, 2.36 mmol) and methyl urea (437 mg, 5.90 mmol) were treated with a solution of magnesium methoxide in methanol (7.4 wt%, 14.5 mL, 7.08 mmol). The reaction mixture was then concentrated in vacuo to approximately one-half the volume of methanol. The resulting reaction mixture was then heated under reflux for 15 h. The reaction mixture was allowed to cool to 25°C and then partitioned between water (75 mL) and ethyl acetate (75 mL). An emulsion formed, and a saturated aqueous sodium chloride solution was added to break down the emulsion. The aqueous layer was further extracted with ethyl acetate (2 x 75 mL). The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo to afford a white semi-solid. The semi-solid was treated with a solution of 2/1 hexanes/ethyl acetate, and a white solid formed. The solid was filtered, washed well with hexanes, and dried to afford l-[3-cyclopentyl-2-(3- fluoro-4-trifluoromethyl-phenyl)-propionyl]-3-methyl-urea (322 mg, 38%) as a white solid: mp 187-189°C; FAB-HRMS m/e calcd for C,7H20F4N2O2 (M+H)+ 361.1539, found 361.1549. Example 159 l-[3-Cyclopentyl-2-(4-ethanesulfonyl-phenyl)-propionyI]-3-methyl-urea
Figure imgf000304_0001
A mixture of aluminum chlonde (72.35 g, 0.54 mol) in chloroform (181 mL) cooled to 0°C was stiπed until homogeneous The reaction mixture was then treated slowly with ethyl oxalyl chlonde (61 mL, 0.54 mol) The resulting reaction mixture was stiπed at 0°C for 30 m It was then slowly treated with ethyl phenyl sulfide (25.0 g, 0.18 mol) The solution turned to a wine color and slowly became gum-like. The resultmg reaction mixture was then stirred at 0°C for 2 h The reaction mixture was slowly poured into a large amount of ice/water The resulting aqueous layer was extracted with chloroform (3 x 200 mL) The combined organic layers were dned over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded (4-ethylsulfanyl-phenyl)-oxo-acetιc acid ethyl ester (23.64 g, 55%) as a yellow oil The matenal was used without further punfication and charactenzation in subsequent reactions
A solution of lodomethylcyclopentane (4.60 g, 21.89 mmol) and tnphenylphosphme (5.74 g, 21.89 mmol) in acetomtπle (22 mL) was heated under reflux for 2 weeks. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to provide an orange solid The orange solid was tnturated with diethyl ether and then filtered. The solid was washed well with diethyl ether until the washings showed the absence of lodomethylcyclopentane and tnphenylphosphme by thin layer chromatography. The solid was allowed to air dry to afford cyclopentylmethyl tnphenylphosphomum iodide (8.92 g, 86%) as a light orange solid: mp 195-198°C; FAB-HRMS m/e calcd for C24H26P (M+H)+ 345.1772, found 345.1784.
A suspension of cyclopentylmethyl triphenylphosphonium iodide (24.48 g, 51.82 mmol) in tetrahydrofuran (100 mL) cooled to 0°C was treated dropwise with a l.OM solution of sodium bis(trimethylsilyl)amide in tetrahydrofuran (52 mL, 51.82 mmol). The bright orange reaction mixture was stirred at 0°C for 1 h. The reaction mixture was then treated with (4-ethylsulfanyl-phenyl)-oxo-acetic acid ethyl ester (9.50 g, 39.87 mmol). The resulting reaction mixture was allowed to warm to 25°C where it was stirred for 20 h. The reaction mixture was concentrated in vacuo to remove tetrahydrofuran and then diluted with water (300 mL). The aqueous layer was extracted with ethyl acetate (3 x 200 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded the 3-cyclopentyl-2-(4-ethylsulfanyl-phenyl)-acrylic acid ethyl ester (6.08 g, 50%) as a yellow oil containing a 1.82:1 mixture of E:Z isomers: FAB-LRMS m/e calcd for Cι8H24O2S (M+H)+ integer mass 304, found 305.
A solution of 3-cyclopentyl-2-(4-ethylsulfanyl-phenyl)-acrylic acid ethyl ester [5.76 g, 18.92 mmol, E:Z = 1.82:1] in methylene chloride (47 mL) was slowly treated with 3- chloroperoxybenzoic acid (57-86% grade, 11.45 g based on 57%, 37.83 mmol). The reaction mixture was stirred at 25°C for 1 h. The reaction mixture was concentrated in vacuo to remove methylene chloride. The resulting residue was diluted with diethyl ether (300 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 200 mL), washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-acrylic acid ethyl ester (4.89 g, 77%) as a colorless oil. The product was a 3:1 mixture of (E):(Z) isomers that was used without further purification and characterization.
A solution of 3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-acrylic acid ethyl ester [4.89 g, 14.53 mmol, (E):(Z) = 3: 1] in ethanol (36 mL) was slowly treated with 10% palladium on activated carbon (244.5 mg). The reaction mixture was stiπed under a positive pressure of hydrogen gas (balloon) at 25°C and atmospheric pressure for 44 h. The catalyst was then filtered off through a pad of celite, and the celite pad was washed well with ethyl acetate. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-ethanesulfonyl- phenyl)-propionic acid ethyl ester (3.50 g, 71%) as a colorless viscous oil: FAB-LRMS m/e calcd for d8H26O4S (M+H)+ integer mass 338, found 339.
3-Cyclopentyl-2-(4-ethanesulfonyl-phenyl)-propionic acid ethyl ester (500 mg, 1.48 mmol) and methyl urea (274 mg, 3.70 mmol) were treated with a solution of magnesium methoxide in methanol (7.4 wt%, 6.5 mL, 4.43 mmol). The reaction mixture was then concentrated in vacuo to approximately one-half the volume of methanol. The resulting reaction mixture was then heated under reflux for 2 d. The reaction mixture was allowed to cool to 25°C and then diluted with ethyl acetate (25 mL). The mixture was filtered through a pad of celite, and the celite pad was washed with ethyl acetate (50 mL). The resulting filtrate was washed with water (40 mL) then the water layer was further extracted with ethyl acetate (40 mL). The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo to afford a colorless oil. The oil was treated with a solution of 2/1 hexanes/ethyl acetate (10 mL), and a white solid began to precipitate. The suspension was placed in the freezer to enhance crystallization. The solid was filtered to afford l-[3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-propionyl]-3- methyl-urea (178 mg, 33%) as a white solid: mp 200-201°C; FAB-HRMS m/e calcd for d8H26N2O4S (M+H)+ 367.1691, found 367.1697. Example 160 l-[2-(4-Chloro-3-nitro-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea
Figure imgf000307_0001
A solution of 4-chloro-3-nitrophenylacetamide (2.00 g, 9.32 mmol) in methanol (40 mL) was treated with Amberlyst® 15 ion exchange resin (15.00 g). The resulting reaction mixture was heated under reflux for 64 h. The reaction mixture was allowed to cool to 25°C and then filtered to remove the Amberlyst® 15 ion exchange resin. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 4-chloro-3-nitro-phenylacetic acid methyl ester (1.91 g, 89%) as a yellow oil: EI-HRMS m/e calcd for C9H8ClNO4 (NT) 229.0142, found 229.0146.
A solution of diisopropylamine (3.35 mL, 23.9 mmol) in dry tetrahydrofuran (45 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (15 mL) cooled to -78°C was treated dropwise with a 2.5M solution of n-butyllithium in hexanes (9.56 mL, 23.9 mmol) over a 10 min period. The pale yellow reaction mixture was stiπed at -78°C for 20 min. At this time, the reaction was treated with a solution of 4-chloro-3-nitrophenylacetic acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 min period. The reaction mixture turned deep purple (almost black) in color. The reaction mixture was then stirred at -78°C for 1 h. At this time, the reaction was treated with a solution of iodomethylcyclopentane (4.58 g, 21.8 mol) in a small amount of dry tetrahydrofuran. The reaction mixture was then stirred at -78°C and then allowed to warm to 25°C, where it was stirred for 48 h. The reaction mixture was then quenched with a saturated aqueous ammonium chloπde solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The residue was diluted with ethyl acetate (150 mL) and water (50 mL). The organic phase was washed with a saturated aqueous sodium chloπde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(4-chloro-3-nιtro-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (2.17 g, 32%) as a yellow oil: EI-HRMS m/e calcd for C15Hι8ClNO4 (M +) 311.0924, found 311.0927.
A solution of 2-(4-chloro-3-nιtro-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (260 mg, 0.834 mmol) in tetrahydrofuran (3 mL) at 25°C was treated with a 0.8M aqueous lithium hydroxide solution (1.25 mL, 1.00 mmol). The reaction mixture was stirred at 25°C for 15 h. The resulting reaction mixture was partitioned between water (50 mL) and ethyl acetate (50 mL) and then treated with a IN aqueous hydrochlonc acid solution (10 mL). The layers were shaken and separated. The aqueous layer was further extracted with ethyl acetate (50 mL). The combined organic layers were dned over magnesium sulfate, filtered, and concentrated in vacuo to afford 2-(4-chloro-3-nιtro-phenyl)-3- cyclopentyl-propionic acid (243 mg, 98%) as a yellow solid which was used without further punfication: mp 112-115°C; FAB-HRMS m/e calcd for C14Hι6ClNO4 (M+H)+ 298.0847, found 298.0851.
A mixture of 2-(4-chloro-3-mtro-phenyl)-3-cyclopentyl-propiomc acid (450 mg, 1.51 mmol) in methylene chlonde (4 mL) was treated with NN-dimethylformamide (1 drop) and then cooled to 0°C. The reaction mixture was then slowly treated with oxalyl chloπde (145 μL, 1.66 mmol). The reaction mixture was stiπed at 0°C for 10 mm and then stiπed at 25°C for 1 h. The resultmg reaction mixture was then treated dropwise with 1,1,1,3,3,3-hexamethyldιsιlazane (960 μL, 4.53 mmol) and subsequently stirred at 25°C for 15 h. The resulting reaction mixture was diluted with methylene chlonde (10 mL) and methanol (10 mL) The organic layer was washed with a 5% aqueous sulfuπc acid solution and a saturated aqueous sodium chloride solution. The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo to afford 2-(4-chloro-3- nitro-phenyl)-3-cyclopentyl-propionamide (295 mg, 67%) as a yellow oil which solidified upon sitting to a yellow solid. The yellow solid was used without further purification: mp 112-114°C; EI-HRMS m/e calcd for C14Hι7ClN2O3 (M+) 296.0927, found 296.0931.
A solution of 2-(4-chloro-3-nitro-phenyl)-3-cyclopentyl-propionamide (200 mg, 0.67 mmol) and methyl isocyanate (382 mg, 6.70 mmol) in toluene (3 mL) was heated under reflux (120°C) for 15 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) afforded l-[2-(4-chloro-3-nitro-phenyl)-3-cyclopentyl-propionyl]- 3-methyl-urea (139 g, 60%) as a white foam: mp 61-64°C (foam to gel); FAB-HRMS m/e calcd for C16H20C1N3O4 (M+H)+ 354.1220, found 354.1232.
Example 161 l-[2-(3-Bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea
Figure imgf000309_0001
A solution of 4-(methylthio)phenylacetic acid (21.21 g, 116.38 mmol) in methanol (291 mL) was treated slowly with concentrated sulfuric acid (3 mL). The resulting reaction mixture was heated under reflux for 3 d. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The resulting residue was diluted with diethyl ether (600 mL). The organic layer was washed with a saturated aqueous sodium bicarbonate solution (3 x 300 mL) and a saturated aqueous sodium chloride solution (1 x 300 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo to afford (4-methylsulfanyl-phenyl)-acetic acid methyl ester (20.95 g, 92%) as a yellow liquid which was used without further purification: EI-HRMS m/e calcd for CιoHι2O2S (M+) 196.0558, found 196.0559.
A solution of (4-methylsulfanyl-phenyl)-acetic acid methyl ester (5.11 g, 26.03 mmol) in carbon tetrachloride (130 mL) was treated slowly with bromine (1.74 mL, 33.84 mmol). The reaction mixture was stirred at 25°C for 4 h, at which time, thin layer chromatography still indicated the presence of a substantial amount of starting material. The reaction mixture was further treated with more bromine (1.74 mL, 33.84 mmol). The reaction mixture was stirred an additional 4 h at 25°C and then quenched with a 10% aqueous sodium bisulfite solution (150 mL). The reaction mixture was concentrated in vacuo to remove carbon tetrachloride. The resulting aqueous layer was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded (3-bromo-4-methylsulfanyl-phenyl)-acetic acid methyl ester (6.10 g, 85%) as a light yellow oil: EI-HRMS m/e calcd for Ci0HnBrO2S (M+) 273.9663, found 273.9661.
A solution of diisopropylamine (3.4 mL, 24.38 mmol) in dry tetrahydrofuran (21 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (7 mL) cooled to -78°C was treated with a 2.5M solution of n-butyllithium in hexanes (9.8 mL, 24.38 mmol). The resulting reaction mixture was stiπed at -78°C for 30 min and then treated dropwise with a solution of (3-bromo-4-methylsulfanyl-phenyl)-acetic acid methyl ester (6.10 g, 22.17 mmol) in dry tetrahydrofuran (21 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (7 mL). The resulting reaction mixture was allowed to stir at -78°C for 1 h. At this time, the reaction was treated with a solution of iodomethylcyclopentane (5.59 g, 26.60 mmol) in a small amount of dry tetrahydrofuran. The resulting reaction mixture was allowed to warm to 25°C where it was stirred for 15 h. The reaction mixture was quenched with water (300 mL) and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (4.52 g, 57%) as a light yellow oil: EI-HRMS m/e calcd for Cι6H2]BrO2S (M*) 356.0446, found 356.0435.
A solution of 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (1.07 g, 2.99 mmol) in methylene chloride (15 mL) was treated with 3- chloroperoxybenzoic acid (57-86% grade, 1.81 g based on 57%, 5.99 mmol). The reaction mixture was stirred at 25°C for 3 h. The reaction mixture was concentrated in vacuo to remove methylene chloride. The resulting residue was diluted with diethyl ether (300 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 200 mL) and a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (1.09 g, 94%) as a colorless oil: EI-HRMS m/e calcd for C16H!9BrO4S (M+) 388.0344, found 388.0343.
A solution of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (1.62 g, 4.16 mol) in methanol (10 mL) was treated with a IN aqueous sodium hydroxide solution (8.7 mL, 8.74 mol). The reaction mixture was stiπed at 25°C for 27 h. The reaction mixture was concentrated in vacuo to remove methanol. The resulting aqueous residue was acidified to pH = 2 with a 10% aqueous hydrochloric acid solution and then extracted with ethyl acetate (1 x 400 mL). The organic layer was washed with water (1 x 300 mL) and washed with a saturated aqueous sodium chloride solution (1 x 300 mL). The organic layer was then dried over sodium sulfate, filtered, and concentrated in vacuo to afford 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionic acid (1.39 g, 89%) as a white solid which was used without further purification: mp 149-150°C; FAB-HRMS m/e calcd for Cι5Hι9BrO4S (M+H)+ 375.0266, found
375.0274.
A mixture of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (400 mg, 1.07 mmol) in methylene chloride (4 mL) cooled to 0°C was treated with N,N- dimethylformamide (2 drops) followed by oxalyl chloride (100 μL, 1.18 mmol). The reaction mixture was stiπed at 0°C for 10 min and then stirred at 25°C for 1 h. The resulting reaction mixture was then treated dropwise with 1,1,1,3,3,3- hexamethyldisilazane (680 μL, 3.21 mmol) and subsequently stiπed at 25°C for 15 h. The reaction mixture was then diluted with methylene chloride (20 mL) and methanol (20 mL). The organic layer was washed with a 5% aqueous sulfuric acid solution (1 x 40 mL) and a saturated aqueous sodium chloride solution. The organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo to afford 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-propionamide (271 mg, 68%) as a white foam. The white foam was used without further purification: mp 60-63 °C; EI-HRMS m/e calcd for C15H2oBrΝO3S (M+) 373.0347, found 373.0348.
A solution of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionamide (200 mg, 0.53 mmol) and methyl isocyanate (61 mg, 1.07 mmol) in toluene (1 mL) was heated under reflux for 24 h. The reaction mixture turned very cloudy with the forming of a white precipitate. The reaction mixture was allowed to cool to 25°C and then treated with hexanes. The reaction mixture was placed in the freezer for 1 h then filtered. The white solid was washed with cold hexanes to afford l-[2-(3-bromo-4-methanesulfonyl-phenyl)- 3-cyclopentyl-propionyl]-3-methyl-urea (100 mg, 44%) as a white solid: mp 259-260°C; FAB-HRMS m/e calcd for d7H23BrN2O4S (M+H)+ 431.0641, found 431.0646. Example 162 l-[2-(3-Cyano-4-methanesulfonyl-phenyl)-3-cyclopentyI-propionyl]-3-methyl-urea
Figure imgf000313_0001
A solution of 4-(methylthio)phenylacetic acid (21.21 g, 116.38 mmol) in methanol (291 mL) was treated slowly with concentrated sulfuric acid (3 mL). The resulting reaction mixture was heated under reflux for 3 d. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The resulting residue was diluted with diethyl ether (600 mL). The organic layer was washed with a saturated aqueous sodium bicarbonate solution (3 x 300 mL) and a saturated aqueous sodium chloride solution (1 x 300 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo to afford (4-methylsulfanyl-phenyl)-acetic acid methyl ester (20.95 g, 92%) as a yellow liquid which was used without further purification: EI-HRMS m/e calcd for CιoH12O2S (M+) 196.0558, found 196.0559.
A solution of (4-methylsulfanyl-phenyl)-acetic acid methyl ester (5.11 g, 26.03 mmol) in carbon tetrachloride (130 mL) was treated slowly with bromine (1.74 mL, 33.84 mmol). The reaction mixture was stirred at 25°C for 4 h, at which time, thin layer chromatography still indicated the presence of a substantial amount of starting material. The reaction mixture was further treated with more bromine (1.74 mL, 33.84 mmol). The reaction mixture was stirred an additional 4 h at 25°C and then quenched with a 10% aqueous sodium bisulfite solution (150 mL). The reaction mixture was concentrated in vacuo to remove carbon tetrachloride. The resulting aqueous layer was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 hexanes/ethyl acetate) afforded (3-bromo-4-methylsulfanyl-phenyl)-acetic acid methyl ester (6.10 g, 85%) as a light yellow oil: EI-HRMS m/e calcd for C10HnBrO2S (M+) 273.9663, found 273.9661.
A solution of diisopropylamine (3.4 mL, 24.38 mmol) in dry tetrahydrofuran (21 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (7 mL) cooled to -78°C was treated with a 2.5M solution of n-butyllithium in hexanes (9.8 mL, 24.38 mmol). The resulting reaction mixture was stirred at -78°C for 30 min and then treated dropwise with a solution of (3-bromo-4-methylsulfanyl-phenyl)-acetic acid methyl ester (6.10 g, 22.17 mmol) in dry tetrahydrofuran (21 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (7 mL). The resulting reaction mixture was allowed to stir at -78°C for 1 h. At this time, the reaction was treated with a solution of iodomethylcyclopentane (5.59 g, 26.60 mmol) in a small amount of dry tetrahydrofuran. The reaction mixture was allowed to warm to 25°C where it was stirred for 15 h. The reaction mixture was quenched with water (300 mL) and then concentrated in vacuo to remove tetrahydrofuran. The remaining aqueous phase was extracted with ethyl acetate (3 x 150 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1 x 200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 19/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4-methylsulfanyl- phenyl)-3-cyclopentyl-propionic acid methyl ester (4.52 g, 57%) as a light yellow oil: EI- HRMS m/e calcd for C16H21BrO2S (M+) 356.0446, found 356.0435.
A solution of 2-(3-bromo-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (1.07 g, 2.99 mmol) in methylene chloride (15 mL) was treated with 3- chloroperoxybenzoic acid (57-86% grade, 1.81 g based on 57%, 5.99 mmol). The reaction mixture was stirred at 25°C for 3 h. The reaction mixture was concentrated in vacuo to remove methylene chloride. The resulting residue was diluted with diethyl ether (300 mL). The organic phase was washed with a saturated aqueous sodium bicarbonate solution (3 x 200 mL) and a saturated aqueous sodium chloride solution (1 x 100 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(3-bromo-4- methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (1.09 g, 94%) as a colorless oil: EI-HRMS m/e calcd for C16Hj9BrO4S (M+) 388.0344, found 388.0343.
A mixture of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (990.0 mg, 2.54 mmol) and copper(I) cyanide (273.3 mg, 3.05 mmol) in dry NN- dimethylformamide (2.5 mL) was heated under reflux for 4 h. The reaction was allowed to cool to 25°C, and the crude reaction mixture was directly purified without further chemical work-up. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 100% hexanes then 3/1 hexanes/ethyl acetate) afforded 2-(3-cyano-4-methanesulfonyl-phenyl)- 3-cyclopentyl-propionic acid methyl ester (646.5 mg, 76%) as a pale yellow oil: EI- HRMS m/e calcd for C17H2ιΝO4S (M+) 335.1191, found 335.1185.
A solution of 2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl -propionic acid methyl ester (4.84 g, 14.4 mol) in tetrahydrofuran (25 mL) was treated with a 0.8M aqueous lithium hydroxide solution (27 mL, 21.6 mmol). The reaction mixture was stiπed at 25°C for 2.5 h. The reaction mixture was partitioned between water and ethyl acetate and then acidified to pH = 2 with a 10% aqueous hydrochloric acid solution. The layers were shaken and separated. The resulting organic layer was washed with a saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered, and concentrated in vacuo to afford crude 2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (3.80 g, 82%) as a pale yellow oil that solidified to a pale yellow solid. An analytical sample was obtained by recrystallization from ethyl acetate to afford 2-(3-cyano-4- methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid as a white solid: mp 180-181°C; EI-HRMS m/e calcd for Cι6Hι9NO4S (M+) 321.1034, found 321.1039. A mixture of 2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid (200 mg, 0.62 mmol) in methylene chloπde (2 mL) cooled to 0°C was treated with NN- dimethylformamide (2 drops). The reaction mixture was then slowly treated with oxalyl chlonde (60 μL, 0.69 mmol). The reaction mixture was stiπed at 0°C for 10 min and then stiπed at 25°C for 1.5 h. The resultmg reaction mixture was then treated dropwise with 1,1,1,3,3,3-hexamethyldιsιlazane (395 μL, 1.87 mmol) and subsequently stiπed at 25°C for 15 h. The reaction mixture was then partitioned between methylene chlonde (20 mL), methanol (15 mL), and a 5% aqueous sulfunc acid solution (25 mL). The organic layer was washed with a saturated aqueous sodium chloπde solution, dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Sihca gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded 2-(3-cyano-4- methanesulf on yl-phenyl)-3-cyclopentyl -propionamide (141 mg, 70%) as a white foam: mp 67-70°C (foam to gel); EI-HRMS m/e calcd for Cι6H2oΝ2O3S (M+) 320.1195, found 320.1195.
A solution of 2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonamιde (135 mg, 0.42 mmol) and methyl isocyanate (72 mg, 1.26 mmol) in toluene (1 mL) was heated under reflux for 15 h. The reaction mixture was allowed to cool to 25 °C and then concentrated in vacuo to afford a yellow semi-solid. The semi-solid was treated with a solution of 2/1 hexanes/ethyl acetate (3 mL) and a white precipitate formed. The suspension was placed in the freezer for 1 h and then filtered to afford l-[2-(3-cyano-4- methanesulfonyl-phenyl)-3-cyclopentyl-propιonyl]-3-methyl-urea (55 mg, 35%) as a white solid: mp 237-239°C; FAB-HRMS m/e calcd for C18H23N3O4S (M+H)+ 378.1487, found 378.1483. Example 163 l-[2-(3,4-Bis-methanesulfonyl-phenyl)-3-cyclopentyl-propionyl]-3-methyl-urea
Figure imgf000317_0001
A solution of 3,4-difluorophenylacetic acid (5.00 g, 29.05 mmol) in methanol (73 mL) was slowly treated with concentrated sulfuric acid (4 mL). The resulting reaction mixture was heated under reflux for 65 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo to remove methanol. The resulting residue was slowly diluted with a saturated aqueous sodium bicarbonate solution (300 mL) and then extracted with ethyl acetate (1 x 300 mL). The organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo to afford (3,4-difluoro-phenyl)-acetic acid methyl ester (5.38 g, 99%) as a yellow oil which was used without further purification.
A solution of sodium thiomethoxide (6.39 g, 86.69 mmol) in dimethyl sulfoxide (72 mL) was treated with (3,4-difluoro-phenyl)-acetic acid methyl ester (5.38 g, 28.89 mmol). The reaction mixture was stiπed at 25°C for 2 h and then at 70°C for 15 min. At this time, thin layer chromatography indicated the absence of starting material and the presence of a very polar new product. The reaction indicated that the ester hydrolyzed to the acid upon heating. The resulting reaction mixture was allowed to cool to 25°C. The reaction mixture was then treated with a 10% aqueous hydrochloric acid solution (200 mL) and then extracted with chloroform (3 x 200 mL). The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo to afford a yellow oil. This yellow oil was dissolved in methanol (100 mL) and then slowly treated with concentrated sulfuric acid (5 mL). The resulting reaction mixture was heated under reflux for 3 h. The reaction mixture was allowed to cool to 25 °C and then concentrated in vacuo to remove methanol The resultmg residue was slowly diluted with a saturated aqueous sodium bicarbonate solution (300 mL) and then extracted with ethyl acetate (1 x 300 mL). The organic layer was dned over magnesium sulfate, filtered, and concentrated in vacuo to afford an inseparable, isomenc mixture of (3-fluoro-4-rnethylsulfanyl-phenyl)-acetιc acid methyl ester and (4-fluoro-3-methylsulfanyl-phenyl)-acetιc acid methyl ester as a yellow oil (4.65 g, 75%) which was used without further puπfication and charactenzation.
A solution of the inseparable, isomenc mixture of (3-fluoro-4-methylsulfanyl-phenyl)- acetic acid methyl ester and (4-fluoro-3-methylsulfanyl-phenyl)-acetιc acid methyl ester
(4 44 g, 20.72 mmol) in methylene chloπde (103 mL) was slowly treated with 3- chloroperoxybenzoic acid (57-86% grade, 13.80 g based on 57%, 45.59 mmol). The reaction mixture was stiπed at 25°C for 4 h The reaction mixture was concentrated in vacuo to remove methylene chloπde. The resulting residue was diluted with ethyl acetate (300 mL) The organic phase was washed with a saturated aqueous sodium bicarbonate solution (1 x 200 mL) and a saturated aqueous sodium chloπde solution (1 x 200 mL), dπed over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography
(Merck Silica gel 60, 70-230 mesh, 20/1 methylene chlonde/ethyl acetate) afforded an inseparable, isomenc mixture of (3-fluoro-4-methanesulfonyl-phenyl)-acetιc acid methyl ester and (4-fluoro-3-methanesulfonyl-phenyl)-acetιc acid methyl ester as a colorless liquid (3.31 g, 65%) which was used without further punfication and charactenzation.
A solution of the inseparable, isomenc mixture of (3-fluoro-4-methanesulfonyl-phenyl)- acetic acid methyl ester and (4-fluoro-3-methanesulfonyl-phenyl)-acetιc acid methyl ester (2.28 g, 9.26 mmol) m dimethyl sulfoxide (23 mL) was treated with sodium thiomethoxide (1.37 g, 18.52 mmol). The reaction mixture was stirred at 25°C for 4 h and then quenched with a 10% aqueous hydrochlonc acid solution. The aqueous layer was extracted with chloroform (1 x 400 mL), dned over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 3/2 hexanes/ethyl acetate) afforded an inseparable, isomeric mixture of (3-methanesulfonyl-4- methylsulfanyl-phenyl)-acetic acid methyl ester and (4-methanesulfonyl-3- methylsulfanyl-phenyl)-acetic acid methyl ester as a yellow liquid (2.19 g, 86%) which was used without further purification and characterization.
A solution of the inseparable, isomeric mixture of (3-methanesulfonyl-4-methylsulfanyl- phenyl)-acetic acid methyl ester and (4-methanesulfonyl-3-methylsulfanyl-phenyl)-acetic acid methyl ester (2.19 g, 7.98 mmol) in methylene chloride (20 mL) was slowly treated with 3-chloroperoxybenzoic acid (57-86% grade, 6.41 g based on 57%, 31.93 mmol). The reaction mixture was stirred at 25°C for 5 h and then slowly quenched with a 1.5N aqueous sodium sulfite solution. The resulting reaction mixture was extracted with methylene chloride (300 mL). The organic phase was dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 10/1 methylene chloride/ethyl acetate) afforded (3,4-bis-methanesulfonyl-phenyl)- acetic acid methyl ester (1.89 g, 77%) as a white solid: mp 157-158°C; EI-HRMS m/e calcd for CnH14O6S2 (M+) 306.0232, found 306.0234.
A solution of diisopropylamine (951 μL, 6.79 mmol) in dry tetrahydrofuran (6 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (2 mL) was cooled to -78°C under nitrogen and then treated with a 2.5M solution of n-butyllithium in hexanes (2.5 mL, 6.79 mmol). The resulting reaction mixture was stirred at -78°C for 30 min and then treated dropwise with a solution of (3,4-bis-methanesulfonyl-phenyl)-acetic acid methyl ester (1.89 g, 6.17 mmol) in dry tetrahydrofuran (12 mL) and l,3-dimethyl-3,4,5,6-tetrahydro- 2(lH)-pyrimidinone (4 mL). The resulting reaction mixture was allowed to stir at -78°C for 1 h. At this time, the reaction was treated with a solution of iodomethylcyclopentane (1.56 g, 7.40 mmol) in a small amount of dry tetrahydrofuran. The reaction mixture was allowed to warm to 25°C where it was stiπed for 64 h. The reaction mixture was quenched with water (150 mL) and then concentrated in vacuo to remove tetrahydrofuran. The remaining residue was further diluted with water (100 mL) and then extracted with .18-
ethyl acetate (1 x 250 mL). The organic layer was washed with a saturated aqueous sodium chlonde solution (1 x 100 mL). dned over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60. 70-230 mesh, 3/1 hexanes/ethyl acetate) afforded 2-(3.4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl- propio c acid methyl ester (1.61 g, 67%) as a yellow oil: EI-HRMS m/e calcd for Ci7H2 O6S2 (M+) 388 1014. found 388 1014
2-(3,4-Bιs-methanesulfonyl-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (375 mg, 0.97 mmol) and methyl urea (214 mg, 2 90 mmol) were treated with a solution of magnesium methoxide in methanol (7 4 wt%. 4.2 mL, 2.90 mmol). The reaction mixture was then concentrated in vacuo to approximately one-half the volume of methanol. The resulting reaction mixture was then heated under reflux for 48 h. The reaction mixture was allowed to cool to 25°C, diluted with ethyl acetate (5 mL), and then filtered through celite. The celite was thoroughly washed with ethyl acetate. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/2 hexanes/ethyl acetate) afforded l-[2-(3,4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl- propιonyl]-3-methyl-urea (65 mg, 16%) as a white solid: mp 220-222°C, EI-HRMS m/e calcd for C18H26N2O6S2 (M+) 430.1232, found 430.1231.
Example 164 l-[3-CyclopentyI-2-(4-fluoro-3-trifluoromethyI-phenyl)-propionyl]-3-methyl-urea
Figure imgf000320_0001
A solution of freshly prepared lithium dusopropylamide (35.3 mL of a 0.31M stock solution, 10.9 mmol) cooled to -78°C was treated with (4-fluoro-3-trifluoromethyl- phenyl)-acetic acid (1.11 g, 5.0 mmol) in tetrahydrofuran/l,3-dimethyl-3,4,5,6-tetrahydro- 2(lH)-pynmidιnone (12.4 mL, 3: 1). The resulting solution was stirred at -78°C for 1 h. At this time, the reaction was treated with a solution of iodomethylcyclopentane (1.16 g, 5.52 mmol) in l,3-dιmethyl-3,4,5.6-tetrahydro-2(lH)-pyrimιdinone (1.2 mL). The reaction mixture was stiπed at -78°C for 4 h. The reaction was then warmed to 25°C and was stiπed at 25°C for 48 h. This solution was then quenched by the slow addition of the reaction mixture to an aqueous solution of 2N hydrochloric acid (50 mL). The product was extracted into ethyl acetate (3 x 100 mL) and diethyl ether (1 x 50 mL). The organic layers were dried over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate with acetic acid) afforded 3-cyclopentyl-2-(4-fluoro-3- trifluoromethyl-phenyl)-propionic acid (1.28 g, 84.3%) as a white solid: mp 66-68°C: EI- HRMS m/e calcd for d5Hι6F4O2 (M j 305.1165, found 305.1174.
A solution 3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)-propionic acid (304 mg, 1.0 mmol) in methylene chloride (10 mL) and N,N-dimethylformamide (1 drop) was cooled to 0°C and then treated with a 2.0M solution of oxalyl chloride in methylene chloride (1.5 mL, 3.0 mmol). The reaction was stiπed for 30 min at 0°C. At this time, 1,1,1,3,3,3-hexamethyldisilazane (2.0 mL, 9.5 mmol) was added to the reaction mixture. The reaction was allowed to slowly warm to 25°C and then stirred at 25°C for 16 h. The reaction mixture was then treated with methanol (3 mL) and diluted with methylene chloride (35 mL). The resulting mixture was washed with a 5% aqueous sulfuric acid solution (2 x 10 mL), water (1 x 25 mL), and a saturated aqueous sodium chloride solution (3 x 25 mL). The organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2-(4-fluoro-3-trifluoromethyl-phenyl)- propionamide (333 mg, 92.5%) as a pale yellow oil: EI-HRMS m/e calcd for
Figure imgf000321_0001
(IVf) 303.1246, found 303.1252. A solution of 3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)-propιonamιde (303 mg, 1 0 mmol) in toluene (5 mL) was treated with methyl isocyanate (0 59 mL, 10 mmol) The resulting solution was heated to reflux for 24 h At this time, the reaction was concentrated in vacuo Flash chromatograph) (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl afforded l-[3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)- propιonyl]-3-methyl-urea (360 mg, 49 2%) as a pale yellow oil FAB-HRMS m/e calcd for C17H20F4N2O2 (M+H)+ 361 1539, found 361 1534
Example 165 l-{2-[4-(Butane-l-suIfonyl)-phenyl]-3-cyclopentyl-propionyl}-3-methyI-urea
Figure imgf000322_0001
A solution of freshly prepared lithium dusopropylamide (430 55 mL of a 0.3M stock solution, 129.16 mmol) cooled to -78°C w as treated with (4-nιtro-phenyl)-acetιc acid ethyl ester (26.32 g, 125.83 mmol) in tetrahydrofuran/hexamethylphosphoramide (312.5 mL, 3.1). The resulting solution was stiπed at -78°C for 45 mm. At this time, the reaction was treated with a solution of iodomethylcyclopentane (27 75 g, 132 1 mmol) in hexamethylphosphoramide (27 75 mL) The mixture was stirred at -78°C for 4 h The reaction was then warmed to 25°C and was stiπed at 25°C for 16 h The reaction mixture was then quenched by the dropwise addition of a saturated aqueous ammonium chloπde solution (250 mL). This mixture was concentrated in vacuo, diluted with water (250 mL), and extracted with ethyl acetate (3 x 300 mL). The organics were washed with a saturated aqueous lithium chloπde solution (2 x 250 mL), dned over magnesium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 98/2 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-nιtro-phenyl)-propιonιc acid ethyl ester (28 30 g, 77.2%) as an yellow oil EI-HRMS m/e calcd for Cι6H21NO4 (M+) 291.1470, found 291 1470
A solution of 3-cyclopentyl-2-(4-mtro-phen\l)-propιonιc acid ethyl ester (7.37 g, 25.3 mmol) in ethyl acetate (316 mL) was treated with 10% palladium on activated carbon (500 mg) The reaction mixture was stiπed under hydrogen gas at 60 psi at 25°C for 18 h. The catalyst was then filtered off through a pad of celite (ethyl acetate). The filtrate was concentrated in vacuo to give 2-(4-amιno-phenyl)-3-cyclopentyl-propιomc acid ethyl ester (3.52 g, 53.3%) as a yellow oil EI-HRMS m/e calcd for C16H23NO2 (M+) 261.1727, found 261.1727
A mixture of concentrated hydrochlonc acid (0.38 mL) and ice (380 mg) cooled to 0°C was treated with 2-(4-amιno-phenyl)-3-cyclopentyl-propιonιc acid ethyl ester (497 mg, 1.90 mmol). After 5 mm, a solution of sodium mtnte (139 mg, 2.0 mmol) m water (0 31 mL) was added to the reaction mixture The resulting solution was stiπed at 0°C for 5 mm. At this time, this solution was added to a solution of n-butyl mercaptan (0.23 mL, 2.20 mmol) in water (0.4 mL) warmed to 45°C. The reaction was stirred at 45°C for 3 h. At this time, the reaction was diluted with water (50 mL) and extracted with methylene chlonde (3 x 50 mL) The organics were dned over sodium sulfate, filtered, and concentrated in vacuo. The crude brown oil (588 mg) in methylene chlonde (16.5 mL) was cooled to 0°C and treated with 3 -chloroperoxybenzoic acid (80-85% grade, 1.5 g, 8.78 mmol). The reaction mixture was stirred at 25°C for 48 h. At this time, the reaction was diluted with methylene chloπde (100 mL). This solution was washed with a saturated aqueous sodium bisulfite solution (1 x 100 mL), a saturated aqueous sodium chloπde solution (1 x 100 mL), a saturated aqueous sodium bicarbonate solution (1 x 100 mL), and a saturated aqueous sodium chloπde solution (1 x 100 mL). The organics were dπed over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 2-[4-(butane- l-sulfonyl)-phenyl]-3-cyclopentyl-propιomc acid ethyl ester (144.3 mg, 20.7%) as a yellow oil. EI-HRMS m/e calcd for C20H30O4S (M+) 366.1865 found 366.1858.
A solution of 2-[4-(butane-l-sulfonyl)-phenyl]-3-cyclopentyl-propιomc acid ethyl ester (125.3 mg, 0.34mmol) in magnesium methoxide in methanol (7.4 wt%, 0.98 mL, 0.68 mmol) was treated with methyl urea (38 mg, 0.51 mmol). This mixture was refluxed at 110°C for 12 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded l-{2-[4-(butane-l-sulfonyl)-phenyl]-3-cyclopentyl-propιonyl}-3-methyl-urea (61.8 mg, 45.8%) as a white solid: mp 189-191°C: EI-HRMS m/e calcd for C2oH3oN2O4S (M+) 395.2005, found 395.2008.
Example 166 l-[3-CyclopentyI-2-(4-methanesulfonyl-3-trifluoromethyl-phenyl)-propionyl]-3- methvl-urea
Figure imgf000324_0001
A solution of freshly prepared lithium dusopropylamide (35.3 mL of a 0.3 IM stock solution, 10.9 mmol) cooled to -78°C was treated with (4-fluoro-3-trifluoromethyl- phenyl)-acetic acid (1.11 g, 5.0 mmol) m tetrahydrofuran/l,3-dimethyl-3,4,5,6-tetrahydro- 2(lH)-pyrimιdmone (12.4 mL, 3: 1). The resultmg solution was stirred at -78°C for 1 h. At this time, the reaction was treated with a solution of iodomethylcyclopentane (1.16 g, 5.52 mmol) in l,3-dimethyl-3,4,5.6-tetrahydro-2(lH)-pyrimidinone (1.2 mL). The reaction mixture was stirred at -78°C for 4 h. The reaction was then warmed to 25°C and was stiπed at 25°C for 48 h This solution w as then quenched by the slow addition of the reaction mixture to an aqueous solution of 2N hydrochlonc acid (50 mL) The product was extracted into ethyl acetate (3 x 100 mLj and diethyl ether (1 x 50 mL). The organics were dned over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate with acetic acid) afforded 3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)- propiomc acid (1.28 g, 84 3%) as a white solid, mp 66-68°C, EI-HRMS m/e calcd for C15H16F4O2 (M+) 305 1165. found 305 1174
A solution of 3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)-propιomc acid (7 77 g, 25.3 mmol) in methanol (50 mL) was treated slowly with concentrated sulfunc acid (0.01 mL) The resulting reaction mixture was heated under reflux for 24 h. The reaction mixture was allowed to cool to 25°C and then concentrated in vacuo. The residue was dissolved m ethyl acetate (75 mL) and washed with a saturated aqueous sodium bicarbonate solution (1 x 50 mL), water (1 x 50 mL), and a saturated aqueous sodium chloπde solution (4 x 50 mL) The organics were dned over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2-(4-fluoro-3- tπfluoromethyl-phenyl)-propιonιc acid methyl ester (8.48 g, 87.5%) as yellow oil: EI- HRMS m/e calcd for d6Hι8F4O2 (M+) 318 1243, found 318.1240.
A solution of 3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)-propιonιc acid methyl ester (7.0 g, 21.9 mmol) in N,N-dιmethylformamιde (50 mL) was treated with sodium methanethiolate (2.61 g, 33 0 mmol) The reaction mixture was then heated to 100- 110°C for 24 h. At this time, the reaction was poured onto a mixture of ice and an aqueous solution of 2Ν hydrochlonc acid (100 mL). This mixture was extracted into ethyl acetate (3 x 75 mL) and diethyl ether (1 x 50 mL). The organics were then washed with water (1 x 75 mL) and a saturated aqueous sodium chlonde solution (3 x 100 mL). The organics were dned over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 85/15 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-methylsulfanyl-3-tπfluoromethyl- phenyl)-propιonιc acid methyl ester (2.48g. 35.5%) as a pale yellow oil: EI-HRMS m/e calcd for C,7H2iF3O2S (MT) 346.1214 , found 346.1212
A solution of 3-cyclopentyl-2-(4-methylsulfanyl-3-tnfluoromethyl-phenyl)-propιomc acid methyl ester (2.36 g, 6.81 mmol) in methylene chlonde (75 mL) at 25°C was treated with 3-chloroperoxybenzoic acid (80-85% grade. 9 69 g, 40.1 mmol). The reaction mixture was stiπed at 25°C for 16 h. At this time, the reaction was diluted with methylene chlonde (75 mL). This solution was washed with a saturated aqueous sodium bisulfite solution (2 x 50 mL), water (1 x 50 mL). a saturated aqueous sodium chlonde solution (3 x 75 mL), a saturated aqueous sodium bicarbonate solution (1 x 75 mL), and a saturated aqueous sodium chloπde solution (3 x 75 mL). The organics were dπed over magnesium sulfate and sodium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2- (4-methanesulfonyl-3-tnfluoromethyl-phenyl)-propιonιc acid methyl ester (2.88 g) as a clear oil: EI-HRMS m/e calcd for Cι7H21F302S (MT) 378.1112, found 378.1116.
A solution of 3-cyclopentyl-2-(4-methylsulfanyl-3-tπfluoromethyl-phenyl)-propιonιc acid methyl ester (378 mg, 1.0 mmol) in magnesium methoxide in methanol (7.4 wt%, 2.0 mL, 1.40 mmol) was treated with methyl urea (148 mg. 2.0 mmol). This mixture was refluxed at 110°C for 12 h. The reaction mixture was then concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 40/60 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2-(4-methanesulfonyl-3-tnfluoromethyl-phenyl)-propιonyl]-3- methyl-urea (61.8 mg, 45.8%) as a white solid: mp 268-270°C; EI-HRMS m/e calcd for Ci8H23F3N2O4S (M+) 420.1331, found 420.1345. Example 167
3-{3-[3-Cyclopentyl-2-(3,4-dichIoro-phen\l)-propionyl]-ureido}-3-oxo-propionic acid etl 1 ester
Figure imgf000327_0001
A solution of [3-cyclopentyl-2-(3.4-dιchloro-phenyl)-propιonyl]-urea (prepared in Example lB-d, 402 mg, 1.22 mmol) and pyndme (0.15 mL, 1.83 mmol) m toluene (15 mL) was treated with ethyl malonyl chloπde (0 19 mL, 1.5 mmol). The resulting reaction mixture was heated at reflux for 2 h. At this time, additional pyndme (0.15 mL, 1.83 mmol) and ethyl malonyl chloπde (0.19 mL, 1.5 mmol) were added. The reaction was then heated at reflux for 90 mm. The reaction was then cooled to 25°C, diluted with ethyl acetate (50 mL), washed with water (2 x 25 mL), and dπed over magnesium sulfate. The solution was concentrated in vacuo. Flash column chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexane/ethyl acetate) afforded 3-{3-[3-cyclopentyl-2-(3,4-dιchloro- phenyl)-propιonyl]-ureιdo}-3-oxo-propιomc acid ethyl ester (172 mg, 32%) as a colorless gum: EI-HRMS m/e calcd for C2oH24Cl2N2O5 (M+) 443.1140, found 443.1128.
Example 168 l-[3-Cyclopentyl-2-(3-fluoro-4-methanesulfonyl-phenyl)-propionyl]-3-methyl-urea
Figure imgf000327_0002
A solution of 4-chloro-3-nitrophenylacetamide (2.00 g, 9.32 mmol) in methanol (40 mL) was treated with Amberlyst® 15 ion exchange resm (15.00 g). The resulting reaction mixture was heated under reflux for 64 h. The reaction mixture was allowed to cool to 25°C and then filtered to remove the Amberlyst® 15 ion exchange resin. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1 hexanes/ethyl acetate) afforded 4-chloro-3-nιtrophenylacetic acid methyl ester (1.91 g, 89%) as a yellow oil: EI-HRMS m/e calcd for C9H8ClNO4 (M÷) 229.0142, found 229.0146.
A solution of diisopropylamine (3.35 mL, 23.9 mmol) in dry tetrahydrofuran (45 mL) and l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidinone (15 mL) cooled to -78°C was treated dropwise with a 2.5M solution of n-butyllithium in hexanes (9.56 mL, 23.9 mmol) over a 10 min period. The pale yellow reaction mixture was stiπed at -78°C for 20 min and then slowly treated with a solution of 4-chloro-3-nitrophenylacetic acid methyl ester (5.00 g, 21.8 mmol) in a small amount of tetrahydrofuran over a 15 min period. The reaction mixture turned deep purple (almost black) in color. The reaction mixture was then stiπed at -78°C for 1 h. At this time, the reaction was treated with a solution of iodomethylcyclopentane (4.58 g, 21.8 mol) in a small amount of dry tetrahydrofuran. The reaction mixture was then stiπed at -78°C and then allowed to warm to 25°C, where it was stiπed for 48 h. The reaction mixture was quenched with a saturated aqueous ammonium chloride solution (50 mL), and the resulting reaction mixture was concentrated in vacuo to remove tetrahydrofuran. The remaining residue was diluted with ethyl acetate (150 mL) and water (50 mL). The organic phase was washed with a saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 2-(4-chloro-3-nitrophenyl)-3-cyclopentyl-propionic acid methyl ester (2.17 g, 32%) as a yellow oil: EI-HRMS m/e calcd for Cι5H18ClNO4 (M+) 311.0924, found 311.0927. A solution of 2-(4-chloro-3-nitrophenyl)-3-cyclopentyl-propionic acid methyl ester (1.00 g, 3.21 mmol) and sodium methanesulfinate (0.36 g, 3.53 mmol) in dimethyl sulfoxide (3 mL) was heated at 130°C for 5 h. The black reaction mixture was then poured over ice (20 g), resulting in the formation of a brown sticky substance. The resulting mixture was then treated with ethyl acetate (50 mL) and water (50 mL), and the layers were separated. The aqueous layer was further extracted with ethyl acetate (2 x 50 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4- methanesulfonyl-3-nitrophenyl)-propionic acid methyl ester (0.95 g, 84%) as a yellow gel: FAB-HRMS m/e calcd for C16H2ιNO6S (M+H)+ 356.1169, found 356.1175.
A solution of 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-propionic acid methyl ester (1.50 g, 4.22 mmol) in methanol (30 mL) was treated with a solution of ammonium chloride (474 mg, 8.86 mmol) in water (3 mL). The reaction mixture was stirred at 25°C for 5 min and then treated with zinc dust (2.70 g, 41.36 mmol). The reaction mixture was heated under reflux for 2 h. The reaction mixture was allowed to cool to 25°C and then filtered through a pad of celite. The filtrate was concentrated in vacuo. The resulting orange oil was dissolved in ethyl acetate, dried over magnesium sulfate, filtrated, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 2/1 hexanes/ethyl acetate) afforded 2-(3-amino-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionic acid methyl ester (1.49 g, 98%) as a white solid: mp 98-100°C; EI-HRMS m/e calcd for d6H23NO4S (M+) 325.1348, found 325.1358.
A slurry of nitrosonium tetrafluoroborate (215 mg, 1.84 mmol) in methylene chloride (6 mL) cooled to 0°C was treated dropwise with a solution of 2-(3-amino-4- methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (500 mg, 1.54 mmol) in a small amount of methylene chloride. The resulting reaction mixture was stiπed at 0°C for 1 h. The reaction mixture was then allowed to warm to 25 °C and then treated with 1,2-dichlorobenzene (6 mL) The resulting reaction mixture was heated at 100°C for 1 h, duπng which time, the methylene chlonde was distilled off After 1 h at 100°C, the reaction mixture w as allowed to cool to 25CC. The crude reaction mixture was directly punfied by flash chromatography, (Merck Silica gel 60, 230-400 mesh, 9/1 hexanes/ethyl acetate to elute 1,2-dichlorobenzene then 2/1 hexanes/ethyl acetate), to afford impure 3- cyclopentyl-2-(3-fluoro-4-methanesulfonyl-phenyl)-propιomc acid methyl ester as a yellow oil. Repunfication by flash chromatography (Merck Silica gel 60, 230-400 mesh, 3/1
Figure imgf000330_0001
acetate) afforded pure 3-cyclopentyl-2-(3-fluoro-4-methanesulfonyl- phenyl)-propιonιc acid methyl ester (214 mg, 42%) as a pale yellow oil which solidified upon sitting at 25°C to a pale yellow solid mp 66-68°C, EI-HRMS m/e calcd for Cι6H2ιFO4S (NT) 328.1144, found 328 1148
3-Cyclopentyl-2-(3-fluoro-4-methanesulfonyl-phenyl)-propιonιc acid methyl ester (90 mg, 0.274 mmol) and methyl urea (61 mg. 0.822 mmol) were treated with a solution of magnesium methoxide in methanol (7.4 wt%, 1.0 mL, 0.685 mmol). The reaction mixture was then concentrated in vacuo to approximately one-half the volume of methanol. The resulting reaction mixture was then heated under reflux for 24 h. The resulting cloudy, white reaction mixture was allowed to cool to 25°C and then filtered through celite. The celite was thoroughly washed with ethyl acetate. The filtrate was concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) afforded l-[3-cyclopentyl-2-(3-fluoro-4-methanesulfonyl-phenyl)- propιonyl]-3-methyl-urea (23.3 mg, 23%) as a white solid: mp 199-200°C; EI-HRMS m/e calcd for C)7H23FN2O4S (M+) 370.1362, found 370.1370
Example 169 l-[2-(4-Cyano-phenyl)-3-cyclopentyl-propionyl]-3-methvl-urea
Figure imgf000331_0001
A solution of (4-bromo-phenyl)-acetιc acid (6.77 g, 31 48 mmol) in methanol (32 mL) was treated with a catalytic amount of concentrated sulfunc acid (3 drops). The reaction mixture was then heated to reflux for 24 h At this time, the reaction as concentrated in vacuo. The residue was treated with an aqueous solution of sodium bicarbonate (100 mL). This solution was extracted with ethyl acetate (3 x 100 mL). The organic layers were washed with a saturated aqueous solution of sodium chloπde. dned over sodium sulfate, filtered and concentrated in vacuo to afford (4-bromo-phenyl)-acetιc acid methyl ester (6 75 g, 94%) as a yellow oil The product was used without further punfication
A solution of freshly prepared lithium dusopropylamide (50.5 mL of 0.3 M, 15.15 mmol) cooled to -78°C was treated with (4-bromo-phenyl)-acetιc acid methyl ester (3.36 g, 14.67 mmol) m tetrahydrofuran/l,3-dιmethyl-3.4,5,6-tetrahydro-2(lH)-pyπmιdmone (37 mL, 3:1). The resulting solution was stiπed at -78°C for 45 mm. At this time, the reaction was treated with a solution of iodomethylcyclopentane (3.24 g, 15.45 mmol) m 1,3-dιmethyl- 3,4,5,6-tetrahydro-2(lH)-pynmιdmone (3.24 mL). The reaction mixture was stiπed at - 78°C for 4 h. The reaction was warmed to 25°C and stiπed at 25°C for 20 h. The reaction mixture was then quenched by the slow addition of a saturated ammonium chloπde solution (40 mL). The reaction mixture was then poured into water (100 mL) and the product was extracted into ethyl acetate (3 x 75 mL). The organics were washed with a saturated aqueous sodium chloπde solution (3 x 100 mL) and a saturated aqueous solution of lithium chlonde (3 x 100 mL), dned over sodium sulfate and magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 2-(4-bromo-phenyl)-3-cyclopentyl- propiomc acid methyl ester (3 86 g, 84.6%) as a clear oil EI-HRMS m/e calcd for ClDH19BrO2 (M") 310.0568 found 310 0564
A solution of 2-(4-bromo-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (1.55 g, 5.0 mmol) in N,N-dιmethylformamιde (12 5 mL) was treated with copper cyanide (672 mg, 7.5 mmol). This mixture was heated at reflux for 21 h The reaction mixture was cooled to 25°C and poured into aqueous ammonium hydroxide (25 mL). The resulting solution was diluted with water (25 mL). This solution was extracted with ethyl acetate (3 x 50 mL). The organics were washed with a saturated aqueous sodium chloπde solution (3 x 75 mL), dπed over sodium sulfate and magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded 2-(4-cyano-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (1.17 g, 91.3%) as a clear oil; EI-HRMS m/e calcd for C16H19ΝO2 (M+) 257.1415 found 257.1406
A mixture of 2-(4-cyano-phenyl)-3-cyclopentyl-propιonιc acid methyl ester (257 mg, 1.0 mmol) and methyl urea (148 mg, 2.0 mmol) m a solution of magnesium methoxide m methanol (7.4 wt%, 2.0 mL, 1.40 mmol) was heated to reflux for 48 h. The reaction mixture was then concentrated in vacuo Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 ethyl acetate/hexanes) afforded l-[2-(4-cyano-phenyl)-3- cyclopentyl-propιonyl]-3-methyl-urea (48.8 mg, 16.3%) as a white solid: mp 61-65°C; FAB-HRMS m/e calcd for Cι7H2ιN3O2 (M+H)+ 300.1712 found 300.1722.
Biological Activity Examples
Example A: In Vitro Glucokinase Activity
Glucokinase Assay Glucokinase (GK) was assayed by coupling the production of glucose-6-phosphate to the generation of NADH with glucose-6-phosphate dehydrogenase (G6PDH, 0.75-1 kumts/mg, Boehπnger Mannheim. Indianapolis, IN) from Leuconostoc mesenteroides as the coupling enzyme (Scheme 2)
GK G6PDH
D-Glucose + ATP *- Glucose-6-Phosphate , *• 6-Phosphogluconolactone
NAD NADH
Scheme 2
Recombinant Human liver GK1 was expressed in E. coli as a glutathione S-transferase fusion protein (GST-GK) [Liang et al. 1995] and was punfied by chromatography over a glutathione-Sepharose 4B affinity column using the procedure provided by the manufacturer (Amersham Pharmacia Biotech, Piscataway, NJ). Previous studies have demonstrated that the enzymatic properties of native GK and GST-GK are essentially identical (Liang et al, 1995, Neet et al . 1990)
The assay was conducted at 25° C m a flat bottom 96-well tissue culture plate from Costar (Cambπdge, MA) with a final incubation volume of 120 μL. The incubation mixture contained 25 mM Hepes buffer (pH, 7.1), 25 mM KCl, 5 mM D-glucose, 1 mM ATP, 1.8 mM NAD, 2 mM MgCl2, 1 μM sorbιtol-6-phosphate, 1 mM dithiothreitol, test drug or 10% DMSO, 1.8 unit/ml G6PDH. and GK (see below). All organic reagents were > 98 % pure and were from Boehnnger Mannheim with the exceptions of D-glucose and Hepes that were from Sigma Chemical Co, St Louis, MO. Test compounds were dissolved in DMSO and were added to the incubation mixture minus GST-GK in a volume of 12 μl to yield a final DMSO concentration of 10%. This mix was premcubated m the temperature controlled chamber of a SPECTRAmax 250 microplate spectrophotometer (Molecular Devices Corporation, Sunnyvale, CA) for 10 minutes to allow temperature equihbπum and then the reaction was started by the addition of 20 μl GST-GK
After addition of enzyme, the increase in optical density (OD) at 340 nm was monitored over a 10 minute incubation penod as a measure of GK activity. Sufficient GST-GK was added to produce an increase in OD3 o of 0 08 to 0 1 units over the 10 minute incubation penod in wells containing 10% DMSO, but no test compound Preliminary expenments established that the GK reaction was linear over this penod of time even in the presence of activators that produced a 5-fold increase in GK activity The GK activity in control wells was compared with the activity in wells containing test GK activators, and the concentration of activator that produced a 50% increase in the activity of GK, i.e., the SC1 5, was calculated. All of the compounds of formula I descnbed in the Synthesis Examples had an SCi 5 less than or equal to 30 μM.
Liang, Y., Kesavan, P , Wang, L , Niswender, K., Tamzawa, Y., Permut, M. A., Magnuson, M., and Matschinsky, F. M Vanable effects of matunty-onset-diabetes-of- youth (MODY)-assocιated glucokinase mutations on the substrate interactions and stability of the enzyme. Biochem. J. 309- 167-173, 1995.
Neet, K., Keenan, R. P., and Tippett, P.S Observation of a kinetic slow transition in monomenc glucokinase. Biochemistry 29;770-777, 1990. Example B: In Vivo Glucokinase Activity
Glucokinase Activator in vivo Screen Protocol
C57BL/6J mice are orally dosed via gavage with Glucokinase (GK) activator at 50 mg/kg body weight following a two hour fasting period. Blood glucose determinations are made five times during the six hour post-dose study period.
Mice (n=6) are weighed and fasted for a two hour period prior to oral treatment. GK activators are formulated at 6.76 mg/ml in Gelucire vehicle (Ethanol:Gelucire44/14:PEG400q.s. 4:66:30 v/w/v. Mice are dosed orally with 7.5μL formulation per gram of body weight to equal a 50 mg/kg dose. Immediately prior to dosing, a pre dose (time zero) blood glucose reading is acquired by snipping off a small portion of the animals tail (~1 mm) and collecting 15 μL blood into a heparinized capillary tube for analysis. Following GK activator administration, additional blood glucose readings are taken at 1, 2, 4, and 6 hours post dose from the same tail wound. Results are interpreted by comparing the mean blood glucose values of six vehicle treated mice with six GK activator treated mice over the six hour study duration. Compounds are considered active when they exhibit a statistically significant (p ≤ 0.05) decrease in blood glucose compared to vehicle for two consecutive assay time points.

Claims

Claims
A compound compnsmg an amide of the formula I
Figure imgf000336_0001
wherein the * indicates an asymmetπc carbon atom,
R1 and R2 are independently hydrogen, halo, ammo, hydroxyammo, nitro, cyano, sulfonamido, lower alkyl, -OR3. -C(O)OR5, perfluoro-lower alkyl, lower alkyl thio, perfluoro-lower alkyl thio, lower alkyl sulfonyl, perfluoro-lower alkyl sulfonyl or lower alkyl sulfinyl,
R3 is cycloalkyl having from 3 to 7 carbon atoms or lower alkyl having from 2 to 4 carbon atoms,
R4 is -C(O)NHR40, or an unsubstituted or mono-substituted five- or six-membered heteroaromatic nng connected by a nng carbon atom to the am e group shown, which five- or six-membered heteroaromatic nng contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting πng carbon atom, said mono- substituted heteroaromatic πng being monosubstituted at a position on a nng carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of lower alkyl. halo, nitro, cyano,
-(CH2)n-OR6, -(CH2)n-C(O)OR7, -(CH2)n-C(O)NHR6, -C(O)-C(O)OR8, -(CH2)n-NHR6; R 4-0 is hydrogen, lower alkyl, lower alkenyl, hydroxy lower alkyl, halo lower alkyl, -(CH2)n-C(0)OR5 or -C(O)-(CH2)π-C(O)OR6,
R5 is hydrogen, lower alkyl or perfluoro-lower alkyl,
R6, R7 and R8 are independently hydrogen or lower alkyl; and
Figure imgf000337_0001
or a pharmaceutically acceptable salt thereof
A compound according to claim 1, wherein
R1 and R2 are independently hydrogen, halo, am o, hydroxyammo, cyano, nitro. lower alkyl, -OR5, -C(O)OR5, perfluoro-lower alkyl. lower alkyl thio, perfluoro- lower alkyl thio, lower alkyl sulfonyl, perfluoro-lower alkyl sulfonyl, lower alkyl sulfinyl, or sulfonamido,
RJ is cycloalkyl having from 3 to 7 carbon atoms;
R4 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic πng connected by a nng carbon atom to the amme group shown, which five- or six- membered heteroaromatic nng contams from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting nng carbon atom, said mono-substituted heteroaromatic nng being monosubstituted at a position on a nng carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of lower alkyl, halo, nitro, cyano, -(CH2)n-OR6, -(CH2)n-C(O)OR7, -(CH2)n-C(O)NHR6, -C(O)-C(O)OR8 or -(CH2)n-NHR6;
Figure imgf000337_0002
R5 is hydrogen, lower alkyl, or perfluoro-lower alkyl; and R6, R7 and R8 are independently hydrogen or lower alkyl; or a pharmaceutically acceptable salt thereof. - DΌ-
3. A compound according to any of claims 1 to 2, wherein R4 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring selected from the group consisting of thiazolyl, pyridinyl. imidazolyl, isoxazolyl, oxazolyl, pyridazinyl, pyrimidinyl or thiadiazolyl.
4. A compound according to any of claims 1 to 3, wherein R is unsubstituted thiazolyl, unsubstituted pyridinyl or pyridinyl substituted by halogen, lower alkyl, hydroxy lower alkyl or -C(O)OR5, wherein R5 is lower alkyl.
5. A compound according to claim 1, wherein
R1 and R2 are independently hydrogen, halo, amino, nitro, cyano, sulfonamido, lower alkyl, perfluoro-lower alkyl, lower alkyl thio, perfluoro-lower alkyl thio, lower alkyl sulfonyl, or perfluoro-lower alkyl sulfonyl;
RJ is cycloalkyl having from 3 to 7 carbon atoms or lower alkyl having from 2 to 4 carbon atoms;
R4 is -C(O)NHR40;
R40 is hydrogen, lower alkyl, lower alkenyl, hydroxy lower alkyl, halo lower alkyl, -(CH2)n-C(O)OR5 or -C(O)-(CH2)n-C(O)OR6;
R and R are hydrogen or lower alkyl; and n is 0, 1, 2, 3 or 4; or a pharmaceutically acceptable salt thereof.
6. A compound according to any of claims 1 or 5, wherein R4 is -C(O)NHR , and R4 is lower alkyl or lower alkenyl.
7. A compound according to any of claims 1 to 6, wherein R ,ι is hydrogen, halo, nitro or cyano.
8. A compound according to any of claims 1 to 7, wherein R1 is hydrogen or halo. J /"
A compound according to any of claims 1 to 8, wherein R2 is hvdrogen, lower alkyl sulfonyl perfluoro-lower alkyl, perfluoro-low er alkyl sulfonyl, halo or -OR5 wherein
R5 is perfluoro-lower alkyl
A compound according to any of claims 1 to 9, wherein R2 is halo or lower alkyl sulfonyl
A compound according to any of claims 1 to 10. wherein the amide is in the R configuration at the asy metnc carbon shown
A compound according to any of claims 1 to 11. wherein RJ is cyclopentyl, cyclohexyl or cycloheptyl
A compound according to any of claims 1 tol2, wherein RJ is cyclopentyl
A compound according to any of claims 1 to 13, selected from the group consisting of
2-(3-chloro-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, 2-(4-bromo-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, 2-(4-chloro-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonarmde,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-N-thιazol-2-yl-2-(4-tnfluoromethyl-phenyl)-propιonamιde, 3-cyclopentyl-2-(3-fluoro-4-tnfluoromethyl-phenyl)-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-N-thιazol-2-yl-2-(3-tnfluoromethyl-phenyl)-propιonamιde,
3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-2-(4-nιtrophenyl)-N-thιazol-2-yl-propιonamιde, 2-(4-amιno-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonannde, 2-(3-ammo-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, 2-(4-chloro-3-nιtro-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde,
2-(4-cyano-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonarmde, 3-cyclopentyl-N-thιazol-2-yl-2-(4-tnfluoromethylsulfanyl-phenyl)-propιonamιde,
3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(4-methylsulfanyl-3-tnfluoromethyl-phenyl)-N-thιazol-2-yl- propionamide, 3-cyclopentyl-2-(4-methanesulfinyl-phenyl)-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(4-methanesulfonyl-3-mtrophenyl)-N-thιazol-2-yl-propιonamιde,
2-(3-ammo-4-methanesulfonyl-phen\l)-3-cyclopentyl-N-thiazol-2-yl-propionamide,
3-cyclopentyl-2-(3-hydroxyammo-4-methanesulfonyl-phenyl)-N-thιazol-2-yl- propionamide,
2-(3-cyano-4-methanesulfonyl-phen\l)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-N-thιazol-2-yl-propιonamιde,
2-(3,4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(4-sulfamoyl-phenyl)-N-thιazol-2-yl-propιonamιde, 2-[4-(butane-l-sulfonyl)-phenyl]-3-cyclopentyl-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-[4-(propane-l-sulfonyl)-phenyl]-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(4-methanesulfonyl-3-tπfluoromethyl-phenyl)-N-thιazol-2-yl- propionamide,
2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl- propionamide,
2-[3-chloro-4-methanesulfonyl-phenyl]-3-cyclopentyl-N-thιazol-2-yl-propιonamιde,
2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-N-thιazol-2-yl-2-(4-tπfluoromethanesulfonyl-phenyl)-propιonamιde,
3-cyclopentyl-N-thιazol-2-yl-2-(3-tnfluoromethanesulfonyl-phenyl)-propιonamιde, 3-cyclopentyl-N-thιazol-2-yl-2-(4-tπfluoromethoxy-phenyl)-propιonamιde,
3-cyclopentyl-2-(3-methoxy-phenyl)-N-thιazol-2-yl-propιonarmde, 3-cyclopentyl-2-(3-hydroxy-phenyl)-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-2-(3,4-dιmethoxy-phenyl)-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-2-(3,4-dιhydroxy-phenyl)-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-2-(4-methoxy-phenyl)-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(4-hydroxy-phenyl)-N-thιazol-2-yl-propιonamιde, 4-[2-cyclopentyl-l-(thιazol-2-ylcarbamoyl)-ethyl]-benzoιc acid methyl ester, 3-cyclopentyl-2-(3-fluoro-4-methoxy-phenyl)-N-thιazol-2-yl-propιonamιde, 3-cyclopentyl-2-(3-fluoro-4-hydrox\-phenyl)-N-thιazol-2-yl-propιonamιde,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(5-hydroxymethyl-thιazol-2-yl)- propionamide,
3-cyclopentyl-2-(3.4-dιchlorophen\l)-N-[4-(2-hydroxyethyl)-thιazol-2-yl]- propionamide.
2-(4-chloro-phenyl)-3-cyclopent\l-N-(5-hydroxymethyl-thιazol-2-yl)-propιonamιde,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(4-hydroxymethyl-thιazol-2-yl)- propionamide,
3-cyclopentyl-N-(4-hydroxymethyl-thιazol-2-yl)-2-(4-methanesulfonyl-phenyl)- propionamide,
3-cyclopentyl-N-[4-(2-hydroxyethyl)-thιazol-2-yl]-2-(4-methanesulfonyl-phenyl)- propionamide,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(4-methyl-thιazol-2-yl)-propιonamιde,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(5-methyl-thιazol-2-yl)-propιonamιde, {2-[2-(3-chloro-phenyl)-3-cyclopentyl-propιonylammo]-thιazol-4-yl}-acetιc acid ethyl ester,
{2-[2-(3-chloro-phenyl)-3-cyclopent\l-propionylammo]-thiazol-4-yl}-acetic acid methyl ester,
2-[2-(3-chloro-phenyl)-3-cyclopent\l-propιonylammo]-thιazole-4-carboxyhc acid methyl ester,
2-[2-(3-chloro-phenyl)-3-cyclopentyl-propιonylammo]-thιazole-4-carboxylιc acid ethyl ester,
{ 2-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylammo]-thιazol-4-yl }-acetιc acid ethyl ester, 2-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-thιazole-4-carboxylιc acid methyl ester,
2-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylammo]-thιazole-4-carboxylιc acid ethyl ester,
{2-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylammo]-thιazol-4-yl}-acetιc acid methyl ester,
{2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thiazol-4-yl}-acetιc acid,
{ 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylamιno]-thιazol-4-yl}-acetιc acid ethyl ester, 2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylammo]-thιazole-5-carboxyhc acid, 2-[3-cyclopentyl-2-(3,4-dιchlorophen\l)-propιonylammo]-thιazole-4-carboxyhc acid,
Figure imgf000342_0001
methyl ester. (2R)-2-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonylamιno]-thιazole-4- carboxyhc acid methyl ester,
2-[3-cyclopentyl-2-(3 4-dιchlorophen\l)-propιonylamιno]-thιazole-5-carboxyhc acid methyl ester,
2-[3-cyclopentyl-2-(3.4-dιchlorophenλl)-propιonylamιno]-thιazole-5-carboxyhc acid ethyl ester.
{2-[3-cyclopentyl-2-(4-nιtro-phenyl)-propιonylammo]-thιazol-4-\l}-acetιc acid ethyl ester
{ 2-[3-cyclopentyl-2-C4-nιtro-phenyl)-propιonylamιno]-thιazol-4-yl }-acetιc acid methyl ester, 2-[3-cyclopentyl-2-(4-nιtro-phenyl)-propιonylamιno]-thιazole-4-carboxylιc acid methyl ester,
2-[3-cyclopentyl-2-(4-nιtro-phenyl)-propιonylamιno]-thιazole-4-carboxyhc acid ethyl ester,
{2-[2-(4-ammo-phenyl)-3-cyclopentyl-propιonylammo]-thιazol-4-yl} -acetic acid methyl ester,
2-[2-(4-armno-phenyl)-3-cyclopentyl-propιonylammo]-thιazole-4-carboxylιc acid methyl ester,
{2-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propιonylamιno]-thιazole-4- carboxyhc acid ethyl ester, { 2-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propionylam o]-thiazol-4-yl }-4- acetic acid methyl ester,
{2-[3-cyclopentyl-2-(4-methanesulfonyl-3-tnfluoromethyl-phenyl)- propιonylammo]-thιazol-4-yl} -acetic acid methyl ester,
2-[3-cyclopentyl-2-(4-methanesulfonyl-3-tnfluoromethyl-phenyl)-propιonylamιno]- thιazole-4-carboxylιc acid methyl ester,
{2-[3-cyclopentyl-2-(4-mtro-phenyl)-propιonylarmno]-thιazol-4-yl} -oxo-acetic acid ethyl ester,
{2-[3-cyclopentyl-2-(3,4-dιchlorophenyl)-propιonylarmno]thιazol-5-yl}-oxo-acetιc ethyl ester, {2-[3-cyclopentyl-2-(4-fluoro-3-tπfluoromethyl-phenyl)-propιonylammo]-thιazol-
4-yl } -oxo-acetic acid ethyl ester,
{2-[2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonylammo]-thιazol- 4-yl} -oxo-acetic acid ethyl ester, 3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(5-nιtro-thιazol-2-yl)-propιonamιde, 3-cyclopentyl-2-(3-fluoro-4-tnfluoromethyl-phenyl)-N-pyndιn-2-\l-propιonamιde, 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-N-pyndm-2-yl-propιonamιde, 3-cyclopentyl-N-pyndm-2-yl-2-(4-tπfluoromethyl-phenyl)-2-propιonamιde, 3-cyclopentyl-N-thιazol-2-yl-2-(3-tπfluoromethyl-phenyl)-propιonamιde,
2-(3-chloro-phenyl)-3-cyclopent\l-N-pyndm-2-yl-propιonamιde. 2-(4-amιno-phenyl)-3-cyclopent\l-N-pyndιn-2-yl-propιonamιde.
Figure imgf000343_0001
2-(4-chloro-phenyl)-3-cyclopent\l-N-pyndm-2-yl-propιonamιde. 2-(4-chloro-3-mtro-phenyl)-3-cyclopentyl-N-pyndιn-2-yl-propιonamιde,
3-cyclopentyl-2-(4-nιtro-phenyl)-N-pyπdm-2-yl-propιonamιde, 2-(4-cyano-phenyl)-3-cyclopentyl-N-pyndιn-2-yl-propιonamιde. 3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-N-pyπdm-2-yl-propιonamιde, 3-cyclopentyl-N-pyndιn-2-yl-2-(4-tnfluoromethylsulfanyl-phenyl)-propιonamιde, 3-cyclopentyl-2-(4-methanesulfonyl-3-mtrophenyl)-N-pyndιn-2-yl-propιonamιde,
3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-pyπdιn-2-yl-propιonamιde,
2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyndm-2-yl- propionamide,
2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyndm-2-yl- propionamide,
3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-N-pyπdm-2-yl-propιonamιde,
2-(3,4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyndm-2-yl-propιonamιde,
2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyndm-2-yl- propionamide, 3-cyclopentyl-2-(4-methanesulfonyl-3-tnfluoromethyl-phenyl)-N-pyndιn-2-yl- propionamide,
3-cyclopentyl-N-pyπdm-2-yl-2-(4-tnfluoromethanesulfonyl-phenyl)-propιonamιde,
3-cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(5-carboxymethylpyndm)-2-yl- propionamide, 6-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonylammo]-nιcotinιc acid methyl ester,
6-[2-(4-chloro-phenyl)-3-cyclopentyl-propionylammo]-nicotinic acid,
6-[2-(3-chloro-phenyl)-3-cyclopentyl-propionylammo]-mcotimc acid methyl ester,
6-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonylamιno]-nιcotιnιc acid methyl ester, 6-[3-cyclopentyl-2-(4-nιtro-phenyl)-propιonylamιno]-nιcotιnιc acid methyl ester,
6-[2-(4-amιno-phenyl)-3-cyclopentyl-propιonylamιno]-nιcotιmc acid methyl ester,
6-[2-(3-chloro-phenyl)-3-cyclopentyl-propιonylammo]-mcotιnιc acid,
6-[2-(4-cyano-phenyl)-3-cyclopentyl-propιonylammo]-nιcotιmc acid, 6-[3-cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)-propιonylamιno]-mcotιnιc acid methyl ester,
6-[3-cyclopentyl-2-(4-tπfluoromethanesulfonyl-phenyl)-propιonylammo]-nιcotιmc acid,
Figure imgf000344_0001
methyl ester,
3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-N-(5-hydroxymethyl-pyndm-2-yl)- propionamide,
3-cyclopentyl-2-(3.4-dιchloro-phenyl)-N-(5-hydroxy-pyndm-2-yl)-propιonamιde,
2-(4-chloro-phenyl)-3-cyclopentyl-N-(5-hydroxymethyl-pyndm-2-yl)- propionamide,
3-cyclopentyl-N-(5-hydroxymethyl-pyndm-2-yl)-2-(4-methanesulfonyl-phenyl)- propionamide,
N-(5-chloro-pyπdm-2-yl)-3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonarmde,
3-cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(5-brompyndm)-2-yl-propιonamιde, 3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-N-(5-tπfluoromethyl-pyndm-2-yl)- propionamide,
N-(5-bromo-pyndm-2-yl)-3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonamιde,
N-(5-chloro-pyπdm-2-yl)-3-cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)- propionamide, N-(5-bromo-pyndm-2-yl)-3-cyclopentyl-2-(4-tπfluoromethanesulfonyl-phenyl)- propionamide,
N-(5-bromo-pyndm-2-yl)-3-cyclopentyl-2-(4-methanesulfonyl-3-mtro-phenyl)- propionamide,
2-(3-bromo-4-methanesulfonyl-phenyl)-N-(5-bromo-pyπdm-2-yl)-3-cyclopentyl- propionamide,
N-(5- bromo-pyndm-2-yl)-2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionamide,
2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-(5-trifluoromethyl-pyndm- 2-yl)-propιonamιde, N-(5-chloro-pyndm-2-yl)-2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionamide, 3-cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(5-nιtropyπdm)-2-yl-propιonamιde,
3-cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(5-methylpyπdm)-2-yl-propιonamιde,
3-cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(4-methylpyndιn)-2-yl-propιonamιde,
3-cyclopentyl-2-(3,4-dιchloro-phenyl)-N-(6-methylpyπdm)-2-yl-propιonamιde, 3-cyclopentyl-N-(5-methyl-pyndιn-2-yl)-2-(4-tnfluoromethanesulfonyl-phenyl)- propionamide,
3-cyclopentyl-2-(4-fluoro-3-tπfluoromethyl-phenyl)-N-(5-methyl-pyndm-2-yl)- propionamide,
6-[3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionylamino]-N-methyl-nicotmamide, 3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(lH-ιmιdazol-2-yl)-propιonamιde,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-(5-methyl-ιsoxazol-3-yl)-propιonamιde,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-oxazol-2-yl-propιonamιde,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-pyndazm-3-yl-propιonamιde,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-pynmιdm-2-yl-propιonamιde, 3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-pynmιdιn-6-yl-propιonamιde,
3-cyclopentyl-2-(4-nιtro-phenyl)-N-pynmιdιn-4-yl-propιonamιde,
3-cyclopentyl-2-(3,4-dιchlorophenyl)-N-[l,3,4]thιadιazol-2-yl-propιonamιde,
2-[4-methanesulfonyl phenyl]-3-cyclohexyl N-thιazol-2-yl-propιonamιde, and
2-[4-methanesulfonyl phenyl]-3-cycloheptyl N-thιazol-2-yl-propιonamιde.
A compound according to any of claims 1 to 13, selected from the group consisting of l-(3-cyclopentyl-2-phenyl-propιonyl)-3-methyl-urea, l-[2-(3-chloro-phenyl)-3 cyclopentyl-propιonyl]-3-methyl-urea, l-[2-(4-chloro-phenyl)-3-cyclopentyl-propιonyl]-3-methyl-urea, l-[2-(4-cyano-phenyl)-3-cyclopentyl-propιonyl]-3-methyl-urea, l-[2-(4-bromo-phenyl)-3-cyclopentyl-propιonyl]-3-methyl urea, [3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea, l-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-3-methyl-urea, l-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonyl]-3-ethyl-urea, l-allyl-3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propnonyl]-urea, l-allyl-3-[3-cyclopentyl-2(R)-(3, 4-dιchloro-phenyl)-propπonyl]-urea, l-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-3-ethyl-urea, -[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonyl]-3-methyl-urea,
-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-3-ιsopropyl-urea,
-[3-cyclopentyl-2-(3.4-dιchloro-phenyl)-propιonyl]-3-propyl-urea,
-[3-cyclopentyl-2-(3,4-dιfluoro-phenyl)-propιonyl]-3-methyl-urea,
-[2-(4-chloro-3-nιtro-phenyl)-3-cyclopentyl-propnonyl]-3-methyl-urea,
-[3-cyclopentyl-2-(4-nιtro-phenyl)-propιonyl]-3-methyl-urea,
-[3-cyclopentyl-2-(4-tπfluoromethylsulfanyl-phenyl)-propιonyl]-3-methyl urea,
-[3-cyclopentyl-2-(4-methylsulfanyl-phenyl)-propιonyl]-3-methyl urea,
-[3-cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)-propιonyl]-3-methyl urea,
-[3-cyclopentyl-2-(3-tnfluoromethanesulfonyl-phenyl)-propιonyl]-3-methyl urea,
-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propιonyl]-3-methyl urea,
-{2-[4-(butane-l-sulfonyl)-phenyl]-3-cyclopentyl-propnonyl}-3-methyl-urea,
-[3-cyclopentyl-2-(4-ethanesulfonyl-phenyl)-propnonyl]-3-methyl-urea,
-[2-(3,4-bιs-methanesulfonyl-phenyl)-3-cyclopentyl-propnonyl]-3-methyl-urea,
-[2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propnonyl]-3-methyl- urea >
-[3-cyclopentyl-2-(3-fluoro-4-methanesulfonyl-phenyl)-propπonyl]-3-methyl-urea,
-[2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propnonyl]-3-methyl-urea,
-[2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propnonyl]-3-methyl- urea,
-[2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propnonyl]-3-ethyl-urea,
-[2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propπonyl]-3-methyl-urea,
-[3-cyclopentyl-2-(4-methanesulfonyl-3-tnfluoromethyl-phenyl)-propnonyl]-3- methyl-urea,
-[3-cyclopentyl-2-(4-fluoro-3-tnfluoromethyl-phenyl)-propιonyl]-3-methyl urea,
-[3-cyclopentyl-2-(3-fluoro-4-tnfluoromethyl-phenyl)-propιonyl]-3-methyl urea,
-[3-cyclopentyl-2-(4-methanesulfonyl-3-mtrophenyl)-propιonyl]-3-methyl-urea,
2-(4-chloro-phenyl)-4-methyl-pentanoyl]-urea,
3-cyclopropyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea,
3-cyclobutyl-2-(3,4-dιchloro-phenyl)-propionyl]-urea,
R-[2-(3,4-dichloro-phenyl)-4-methyl-pentanoyl]-urea,
-[2-(3,4-dichloro-phenyl)-4-methyl-pentanoyl]-3-methyl-urea,
-[2-(3,4-dichloro-phenyl)-hexanoyl]-3-methyl-urea, 3-[cyclohexyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea,
[3-cyclohexyl-2-(3,4-dιchloro-phenyl)-propιonyl]-3-methyl-urea,
[3-cycloheptyl-2-(3,4-dιchloro-phenyl)-propιonyl]-urea,
3-{3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-propιonιc acid ethyl ester,
(3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-acetιc acid ethyl ester,
{3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-acetιc acid methyl ester, 3-{3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-propιonιc acid methyl ester,
{3-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-acetιc acid ethyl ester,
3-{3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-ureιdo}-3-oxo-propιonιc acid ethyl ester, l-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propπonyl]-3-(2-hydroxy-ethyl)-urea, l-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propnonyl]-3-(2-hydroxy-propyl)-urea, l-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propπonyl]-3-(3-hydroxy-propyl)-urea, l-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propnonyl]-3-(2-hydroxy-propyl)-urea, l-(2-chloro-ethyl)-3-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propnonyl]-urea, and l-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propπonyl]-3-(3-hydroxy-propyl)-urea
A compound according to any of claims 1 to 14, selected from the group consisting of
3-Cyclopentyl-2-(4-methanesulfonyl-phenyl)-N-thιazol-2-yl-propιonamιde, 3-Cyclopentyl-N-thιazol-2-yl-2-(4-tπfluoromethoxy-phenyl)-propιonamιde,
3-Cyclopentyl-N-thιazol-2-yl-2-(4-tnfluoromethanesulfonyl-phenyl)-propιonamιde,
3-Cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-N-pyndιn-2-yl-propιonamιde,
6-[3-Cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonylammo]-nιcotιnιc acid methyl ester, N-(5-Chloro-pyndm-2-yl)-3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonamιde,
3-Cyclopentyl-N-pyπdιn-2-yl-2-(4-tnfluoromethanesulfonyl-phenyl)-propιonamιde,
3-Cyclopentyl-N-(5-methyl-pyndm-2-yl)-2-(4-tnfluoromethanesulfonyl-phenyl)- propionamide,
3-Cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-N-(5-hydroxymethyl-pyndm-2-yl) propionamide, 6-[3-Cyclopentyl-2-(4-tnfluoromethanesulfonyl-phenyl)-propionylammo]-nicotmic acid methyl ester,
3-Cyclopentyl-2-(3-fluoro-4-tnfluoromethyl-phenyl)-N-pyndm-2-yl-propιonamιde,
3-Cyclopentyl-2-(4-methanesulfonyl-3-mtrophenyl)-N-pyπdm-2-yl-propιonamιde, 2-(3-Bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyndm-2-yl- propionamide,
2-(3-Cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyndm-2-yl- propi on amide,
2-(4-Chloro-3-nιtro-phenyl)-3-cyclopentyl-N-pyπdm-2-yl-propιonamιde, 2-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-pyndm-2-yl- propionamide,
N-(5-Bromo-pyπdm-2-yl)-2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl- propionamide.
2-[3-Chloro-4-methanesulfonyl-phenyl]-3-cyclopentyl-N-thιazol-2-yl- propionamide,
(2R)-3-Cyclopentyl-2-(4-methanesulfonylphenyl)-N-thιazol-2-yl-propιonamιde,
2-(3-Bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl- propionamide,
2-(3-Cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thιazol-2-yl-propιonamιde, 3-Cyclopentyl-2-(4-ethanesulfonyl-phenyl)-N-thιazol-2-yl-propιonamιde,
3-Cyclopentyl-2-(4-methanesulfonyl-3-tnfluoromethyl-phenyl)-N-thιazol-2-yl- propionamide, and
N-(5-Bromo-pyπdιn-2-yl)-2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3- cyclopentyl-propionamide.
17 A compound according to any of claims 1 to 13 and 15, selected from the group consisting of l-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonyl]-3-ethyl-urea, l-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonyl]-3-methyl-urea, l-[3-cyclopentyl-2-(3,4-dιchloro-phenyl)-propιonyl]-3-methyl urea, l-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propιonyl]-3-methyl urea, l-Allyl-3-[3-cyclopentyl-2(R)-(3,4-dιchloro-phenyl)-propιonyl]-urea,
1 - [2-(3 -Chloro-4-methanesulf onyl-phenyl)-3 -cyclopentyl -propionyl] -3 -methyl-urea, l-[2(R)-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonyl]-3-methyl- urea, and l-[2-(3-Bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propιonyl]-3-methyl-urea
18 The use of the compounds according to any of claims 1 to 17 for the treatment of type II diabetes
19 A pharmaceutical composition compnsmg a compound of any of claims 1 to 17 and a pharmaceutically acceptable earner and/or adjuvant.
20 The use of a compound according to any of claims 1 to 17 for the preparation of medicaments containing a compound according to any of claims 1 to 17 for the treatment or prophylaxis of type II diabetes.
21. A method for the prophylactic or therapeutic treatment of type II diabetes, which method compnses admmistπng a compound of any of claims 1 to 17 to a human being or an animal.
22. A process for the preparation of the compounds of formula I according to any of claims 1 to 17, which process compnses: (a) The condensation of a compound of formula XI:
Figure imgf000350_0001
wherein R1, R~ and RJ are as defined in claim 1; with a compound of the formula Nπi:
Figure imgf000350_0002
wherein R42 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic nng connected by a πng carbon atom to the am e group shown, which five- or six-membered heteroaromatic ring contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom; said mono-substituted heteroaromatic πng being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of lower alkyl, halo, nitro, cyano, -(CH2)π-OR6, -(CH2)n-C(O)OR7, -(CH2)n-C(O)NHR6, -C(O)-C(O)OR8 or -(CH2)n-NHR6; R6, R7. R8 and n are as defined in claim 1 ; via peptide coupling to produce a compound of formula I-d:
wherein R1, R2, RJ and R42 are as defined above; optionally followed by the conversion of one or both of the substituents R1 and/or
7 1 ? R into another substituent R and/or R as defined in claim 1. (b) The reaction of a compound of formula IX:
Figure imgf000351_0001
wherein R1. RJ and RJ are as defined in claim 1; with a compound of the formula X:
R41-N=C=O X wherein R41 is lower alkyl, lower alkenyl, hydroxy lower alkyl, halo lower alkyl or -(CH2)n-C(O)OR3, wherein R3 is hydrogen or lower alkyl and n is as defined above; to produce a compound of formula I-a:
Figure imgf000351_0002
wherein R , R , RJ and R are as defined above; optionally followed by the conversion of one or both of the substituents R1 and/or R into another substituent R and/or R as defined in claim 1.
(c) The reaction of a compound of the formula XI:
Figure imgf000351_0003
wherein R1, R2 and R3 are as defined in claim 1; with a compound of the formula:
H2NCONH2 to produce a compound of the formula I-b:
Figure imgf000352_0001
wherein R1, R~ and RJ are as defined above; optionally followed by the conversion of one or both of the substituents R1 and/or R" into another substituent R1 and/or R" as defined claim 1.
(d) The reaction of a compound of the formula I-b
Figure imgf000352_0002
wherein R1, R2 and RJ are as defined m claim 1; with a compound of the formula XIII: cic(O)-(CH2)n-c(O)OR6 xm wherein R6 is hydrogen or lower alkyl and n is as defined in claim 1; to produce a compound of the formula I-c:
Figure imgf000352_0003
wherein R , 1 , r R>2 , π R3 , R>6 and n are as defined above; optionally followed by the conversion of one or both of the substituents R1 and/or R2 into another substituent R1 and/or R2 as defined in claim 1.
23. The invention as descnbed hereinbefore.
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AT00918816T ATE278680T1 (en) 1999-03-29 2000-03-20 GLUCOCINASE ACTIVATORS
BRPI0009486-2A BR0009486B1 (en) 1999-03-29 2000-03-20 compound comprising an amide, pharmaceutical composition comprising such compound, its use and process for the preparation thereof.
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EP00918816A EP1169312B1 (en) 1999-03-29 2000-03-20 Glucokinase activators
JP2000607996A JP3884232B2 (en) 1999-03-29 2000-03-20 Glucokinase activator
CA002368347A CA2368347C (en) 1999-03-29 2000-03-20 Glucokinase activators
DE60014610T DE60014610T2 (en) 1999-03-29 2000-03-20 GLUKOKINASE ACTIVATORS
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AU39630/00A AU767830B2 (en) 1999-03-29 2000-03-20 Glucokinase activators
IL145322A IL145322A (en) 1999-03-29 2001-09-06 Glucokinase activators
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NO20014671A NO320697B1 (en) 1999-03-29 2001-09-26 Glucokinase activators, their preparation, and their use in the manufacture of medicaments and their use in the prevention and treatment of diabetes.
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