US20060167066A1 - Pyrrolidine inhibitors of IAP - Google Patents

Pyrrolidine inhibitors of IAP Download PDF

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US20060167066A1
US20060167066A1 US11/312,063 US31206305A US2006167066A1 US 20060167066 A1 US20060167066 A1 US 20060167066A1 US 31206305 A US31206305 A US 31206305A US 2006167066 A1 US2006167066 A1 US 2006167066A1
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mmol
alkyl
heterocycle
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compound
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Frederick Cohen
Vickie Tsui
Cuong Ly
John Flygare
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Genentech Inc
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Genentech Inc
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Priority to US11/312,063 priority Critical patent/US20060167066A1/en
Assigned to GENENTECH, INC. reassignment GENENTECH, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FLYGARE, JOHN A., TSUI, VICKIE HSIAO-WEI, COHEN, FREDERICK, LY, CUONG
Publication of US20060167066A1 publication Critical patent/US20060167066A1/en
Priority to US12/105,109 priority patent/US20090176822A1/en
Priority to US12/538,794 priority patent/US8609845B2/en
Priority to US14/088,110 priority patent/US9040706B2/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
    • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
    • C07D471/04—Ortho-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
    • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
    • C07D417/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings directly linked by a ring-member-to-ring-member bond
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/425—Thiazoles
    • A61K31/427—Thiazoles not condensed and containing further heterocyclic rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
    • C07D417/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing three or more hetero rings

Definitions

  • the present invention relates to organic compounds useful for therapy and/or prophylaxis in a mammal, and in particular to inhibitors of IAP proteins useful for treating cancers.
  • Apoptosis or programmed cell death is a genetically and biochemically regulated mechanism that plays an important role in development and homeostasis in invertebrates as well as vertebrates. Aberrancies in apoptosis that lead to premature cell death have been linked to a variety of developmental disorders. Deficiencies in apoptosis that result in the lack of cell death have been linked to cancer and chronic viral infections (Thompson et al., (1995) Science 267, 1456-1462).
  • caspases cyste containing aspartate specific proteases
  • Caspases are strong proteases, cleaving after aspartic acid residues and once activated, digest vital cell proteins from within the cell. Since caspases are such strong proteases, tight control of this family of proteins is necessary to prevent premature cell death.
  • caspases are synthesized as largely inactive zymogens that require proteolytic processing in order to be active. This proteolytic processing is only one of the ways in which caspases are regulated. The second mechanism is through a family of proteins that bind and inhibit caspases.
  • IAP Inhibitors of Apoptosis
  • IAPs were originally discovered in baculovirus by their functional ability to substitute for P35 protein, an anti-apoptotic gene (Crook et al. (1993) J Virology 67, 2168-2174). IAPs have been described in organisms ranging from Drosophila to human. Regardless of their origin, structurally, IAPs comprise one to three Baculovirus IAP repeat (BIR) domains, and most of them also possess a carboxyl-terminal RING finger motif.
  • BIR Baculovirus IAP repeat
  • the BIR domain itself is a zinc binding domain of about 70 residues comprising 4 alpha-helices and 3 beta strands, with cysteine and histidine residues that coordinate the zinc ion (Hinds et al., (1999) Nat. Struct. Biol. 6, 648-651). It is the BIR domain that is believed to cause the anti-apoptotic effect by inhibiting the caspases and thus inhibiting apoptosis.
  • human X-chromosome linked IAP XIAP
  • inhibits caspase 3, caspase 7 and the Apaf-1-cytochrome C mediated activation of caspase 9 (Deveraux et al., (1998) EMBO J. 17, 2215-2223).
  • Caspases 3 and 7 are inhibited by the BIR2 domain of XIAP, while the BIR3 domain of XIAP is responsible for the inhibition of caspase 9 activity.
  • XIAP is expressed ubiquitously in most adult and fetal tissues (Liston et al, Nature, 1996, 379(6563):349), and is overexpressed in a number of tumor cell lines of the NCI 60 cell line panel (Fong et al, Genomics, 2000, 70:113; Tamm et al, Clin. Cancer Res. 2000, 6(5):1796).
  • ML-IAP Melanoma IAP
  • BIR domain of ML-IAP appears to have the most similarities to the BIR2 and BIR3 of XIAP, C-IAP1 and C-IAP2, and appears to be responsible for the inhibition of apoptosis, as determined by deletional analysis.
  • ML-IAP could inhibit chemotherapeutic agent induced apoptosis.
  • Agents such as adriamycin and 4-tertiary butylphenol (4-TBP) were tested in a cell culture system of melanomas overexpressing ML-IAP and the chemotherapeutic agents were significantly less effective in killing the cells when compared to a normal melanocyte control.
  • the mechanism by which ML-IAP produces an anti-apoptotic activity is in part through inhibition of caspase 3 and 9. ML-IAP did not effectively inhibit caspases 1, 2, 6, or 8.
  • novel inhibitors of IAP proteins having the general formula I: wherein
  • compositions comprising compounds of formula I and a carrier, diluent or excipient.
  • a method of inducing apoptosis in a cell comprising introducing into said cell a compound of formula I.
  • a method of sensitizing a cell to an apoptotic signal comprising introducing into said cell a compound of formula I.
  • a method for inhibiting the binding of an IAP protein to a caspase protein comprising contacting said IAP protein with a compound of formula I.
  • a method for treating a disease or condition associated with the overexpression of an IAP protein in a mammal comprising administering to said mammal an effective amount of a compound of formula I.
  • Acyl means a carbonyl containing substituent represented by the formula —C(O)—R in which R is H, alkyl, a carbocycle, a heterocycle, carbocycle-substituted alkyl or heterocycle-substituted alkyl wherein the alkyl, alkoxy, carbocycle and heterocycle are as defined herein.
  • Acyl groups include alkanoyl (e.g. acetyl), aroyl (e.g. benzoyl), and heteroaroyl.
  • Alkyl means a branched or unbranched, saturated or unsaturated (i.e. alkenyl, alkynyl) aliphatic hydrocarbon group, having up to 12 carbon atoms unless otherwise specified.
  • alkylamino the alkyl portion may be a saturated hydrocarbon chain, however also includes unsaturated hydrocarbon carbon chains such as “alkenylamino” and “alkynylamino.
  • alkyl groups are methyl, ethyl, n-propyl, isopropyl, n-butyl, iso-butyl, sec-butyl, tert-butyl, n-pentyl, 2-methylbutyl, 2,2-dimethylpropyl, n-hexyl, 2-methylpentyl, 2,2-dimethylbutyl, n-heptyl, 3-heptyl, 2-methylhexyl, and the like.
  • lower alkyl C 1 -C 4 alkyl and “alkyl of 1 to 4 carbon atoms” are synonymous and used interchangeably to mean methyl, ethyl, 1-propyl, isopropyl, cyclopropyl, 1-butyl, sec-butyl or t-butyl.
  • substituted, alkyl groups may contain one, for example two, three or four substituents which may be the same or different.
  • substituents are, unless otherwise defined, halogen, amino, hydroxyl, protected hydroxyl, mercapto, carboxy, alkoxy, nitro, cyano, amidino, guanidino, urea, sulfonyl, sulfinyl, aminosulfonyl, alkylsulfonylamino, arylsulfonylamino, aminocarbonyl, acylamino, alkoxy, acyl, acyloxy, a carbocycle, a heterocycle.
  • Examples of the above substituted alkyl groups include, but are not limited to; cyanomethyl, nitromethyl, hydroxymethyl, trityloxymethyl, propionyloxymethyl, aminomethyl, carboxymethyl, carboxyethyl, carboxypropyl, alkyloxycarbonylmethyl, allyloxycarbonylaminomethyl, carbamoyloxymethyl, methoxymethyl, ethoxymethyl, t-butoxymethyl, acetoxymethyl, chloromethyl, bromomethyl, iodomethyl, trifluoromethyl, 6-hydroxyhexyl, 2,4-dichloro(n-butyl), 2-amino(iso-propyl), 2-carbamoyloxyethyl and the like.
  • the alkyl group may also be substituted with a carbocycle group.
  • Examples include cyclopropylmethyl, cyclobutylmethyl, cyclopentylmethyl, and cyclohexylmethyl groups, as well as the corresponding -ethyl, -propyl, -butyl, -pentyl, -hexyl groups, etc.
  • Substituted alkyls include substituted methyls e.g. a methyl group substituted by the same substituents as the “substituted C n -C m alkyl” group.
  • Examples of the substituted methyl group include groups such as hydroxymethyl, protected hydroxymethyl (e.g. tetrahydropyranyloxymethyl), acetoxymethyl, carbamoyloxymethyl, trifluoromethyl, chloromethyl, carboxymethyl, bromomethyl and iodomethyl.
  • Amidine means the group —C(NH)—NHR wherein R is H or alkyl or aralkyl. A particular amidine is the group —NH—C(NH)—NH 2 .
  • Amino means primary (i.e. —NH 2 ), secondary (i.e. —NRH) and tertiary (i.e. —NRR) amines.
  • Particular secondary and tertiary amines are alkylamine, dialkylamine, arylamine, diarylamine, aralkylamine and diaralkylamine wherein the alkyl is as herein defined and optionally substituted.
  • Particular secondary and tertiary amines are methylamine, ethylamine, propylamine, isopropylamine, phenylamine, benzylamine dimethylamine, diethylamine, dipropylamine and disopropylamine.
  • “Amino-protecting group” refers to a derivative of the groups commonly employed to block or protect an amino group while reactions are carried out on other functional groups on the compound.
  • protecting groups include carbamates, amides, alkyl and aryl groups, imines, as well as many N-heteroatom derivatives which can be removed to regenerate the desired amine group.
  • Particular amino protecting groups are Boc, Fmoc and Cbz. Further examples of these groups are found in T. W. Greene and P. G. M. Wuts, “Protective Groups in Organic Synthesis”, 2 nd ed., John Wiley & Sons, Inc., New York, N.Y., 1991, chapter 7; E.
  • protected amino refers to an amino group substituted with one of the above amino-protecting groups.
  • Aryl when used alone or as part of another term means a carbocyclic aromatic group whether or not fused having the number of carbon atoms designated or if no number is designated, up to 14 carbon atoms.
  • Particular aryl groups are phenyl, naphthyl, biphenyl, phenanthrenyl, naphthacenyl, and the like (see e.g. Lang's Handbook of Chemistry (Dean, J. A., ed) 13 th ed. Table 7-2 [1985]).
  • a particular aryl is phenyl.
  • Substituted phenyl or substituted aryl means a phenyl group or aryl group substituted with one, two, three, four or five, for example 1-2, 1-3 or 1-4 substituents chosen, unless otherwise specified, from halogen (F, Cl, Br, I), hydroxy, protected hydroxy, cyano, nitro, alkyl (for example C 1 -C 6 alkyl), alkoxy (for example C 1 -C 6 alkoxy), benzyloxy, carboxy, protected carboxy, carboxymethyl, protected carboxymethyl, hydroxymethyl, protected hydroxymethyl, aminomethyl, protected aminomethyl, trifluoromethyl, alkylsulfonylamino, alkylsulfonylaminoalkyl, arylsulfonylamino, arylsulonylaminoalkyl, heterocyclylsulfonylamino, heterocyclylsulfonylaminoalkyl, heterocyclyl, aryl
  • substituted phenyl includes but is not limited to a mono- or di(halo)phenyl group such as 2-chlorophenyl, 2-bromophenyl, 4-chlorophenyl, 2,6-dichlorophenyl, 2,5-dichlorophenyl, 3,4-dichlorophenyl, 3-chlorophenyl, 3-bromophenyl, 4-bromophenyl, 3,4-dibromophenyl, 3-chloro4-fluorophenyl, 2-fluorophenyl and the like; a mono- or di(hydroxy)phenyl group such as 4-hydroxyphenyl, 3-hydroxyphenyl, 2,4-dihydroxyphenyl, the protected-hydroxy derivatives thereof and the like; a nitrophenyl
  • substituted phenyl represents disubstituted phenyl groups where the substituents are different, for example, 3-methyl4-hydroxyphenyl, 3-chloro-4-hydroxyphenyl, 2-methoxy-4-bromophenyl, 4-ethyl-2-hydroxyphenyl, 3-hydroxy-4-nitrophenyl, 2-hydroxy-4-chlorophenyl, and the like, as well as trisubstituted phenyl groups where the substituents are different, for example 3-methoxy4-benzyloxy-6-methyl sulfonylamino, 3-methoxy4-benzyloxy-6-phenyl sulfonylamino, and tetrasubstituted phenyl groups where the substituents are different such as 3-methoxy-4-benzyloxy-5-methyl-6-phenyl sulfonylamino.
  • Particular substituted phenyl groups include the 2-chlorophenyl, 2-aminophenyl, 2-bromophenyl, 3-methoxyphenyl, 3-ethoxy-phenyl, 4-benzyloxyphenyl, 4-methoxyphenyl, 3-ethoxy4-benzyloxyphenyl, 3,4-diethoxyphenyl, 3-methoxy-4-benzyloxyphenyl, 3-methoxy4-( 1-chloromethyl)benzyloxy-phenyl, 3-methoxy-4-(1-chloromethyl)benzyloxy -6- methyl sulfonyl aminophenyl groups.
  • Fused aryl rings may also be substituted with any, for example 1, 2 or 3, of the substituents specified herein in the same manner as substituted alkyl groups.
  • Carbocyclyl “carbocyclylic”, “carbocycle” and “carbocyclo” alone and when used as a moiety in a complex group such as a carbocycloalkyl group, refers to a mono-, bi-, or tricyclic aliphatic ring having 3 to 14 carbon atoms, for example 3 to 7 carbon atoms, which may be saturated or unsaturated, aromatic or non-aromatic.
  • Particular saturated carbocyclic groups are cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl groups.
  • a particular saturated carbocycle is cyclopropyl.
  • Another particular saturated carbocycle is cyclohexyl.
  • Particular unsaturated carbocycles are aromatic e.g. aryl groups as previously defined, for example phenyl.
  • the terms “substituted carbocyclyl”, “carbocycle” and “carbocyclo” mean these groups substituted by the same substituents as the “substituted alkyl” group.
  • Carboxy-protecting group refers to one of the ester derivatives of the carboxylic acid group commonly employed to block or protect the carboxylic acid group while reactions are carried out on other functional groups on the compound.
  • carboxylic acid protecting groups include 4-nitrobenzyl, 4-methoxybenzyl, 3,4-dimethoxybenzyl, 2,4-dimethoxybenzyl, 2,4,6-trimethoxybenzyl, 2,4,6-trimethylbenzyl, pentamethylbenzyl, 3,4-methylenedioxybenzyl, benzhydryl, 4,4′-dimethoxybenzhydryl, 2,2′,4,4′-tetramethoxybenzhydryl, alkyl such as t-butyl or t-amyl, trityl, 4-methoxytrityl, 4,4′-dimethoxytrityl, 4,4′,4′′-trimethoxytrityl, 2-phenylprop-2-yl, trimethyl
  • carboxy-protecting group employed is not critical so long as the derivatized carboxylic acid is stable to the condition of subsequent reaction(s) on other positions of the molecule and can be removed at the appropriate point without disrupting the remainder of the molecule.
  • it is important not to subject a carboxy-protected molecule to strong nucleophilic bases, such as lithium hydroxide or NaOH, or reductive conditions employing highly activated metal hydrides such as LiAlH 4 . (Such harsh removal conditions are also to be avoided when removing amino-protecting groups and hydroxy-protecting groups, discussed below.)
  • Particular carboxylic acid protecting groups are the alkyl (e.g.
  • protected carboxy refers to a carboxy group substituted with one of the above carboxy-protecting groups.
  • guanidine means the group —NH—C(NH)—NHR wherein R is H or alkyl or aralkyl.
  • R is H or alkyl or aralkyl.
  • a particular guanidine is the group —NH—C(NH)—NH 2 .
  • “Hydroxy-protecting group” refers to a derivative of the hydroxy group commonly employed to block or protect the hydroxy group while reactions are carried out on other functional groups on the compound.
  • protecting groups include tetrahydropyranyloxy, benzoyl, acetoxy, carbamoyloxy, benzyl, and silylethers (e.g. TBS, TBDPS) groups. Further examples of these groups are found in T. W. Greene and P. G. M. Wuts, “Protective Groups in Organic Synthesis”, 2 nd ed., John Wiley & Sons, Inc., New York, N.Y., 1991, chapters 2-3; E.
  • protected hydroxy refers to a hydroxy group substituted with one of the above hydroxy-protecting groups.
  • Heterocyclic group “heterocyclic”, “heterocycle”, “heterocyclyl”, or “heterocyclo” alone and when used as a moiety in a complex group such as a heterocycloalkyl group, are used interchangeably and refer to any mono-, bi-, or tricyclic, saturated or unsaturated, aromatic (heteroaryl) or non-aromatic ring having the number of atoms designated, generally from 5 to about 14 ring atoms, where the ring atoms are carbon and at least one heteroatom (nitrogen, sulfur or oxygen), for example 1 to 4 heteroatoms.
  • a 5-membered ring has 0 to 2 double bonds and 6- or 7-membered ring has O to 3 double bonds and the nitrogen or sulfur heteroatoms may optionally be oxidized (e.g. SO, SO 2 ), and any nitrogen heteroatom may optionally be quaternized.
  • non-aromatic heterocycles are morpholinyl (morpholino), pyrrolidinyl, oxiranyl, oxetanyl, tetrahydrofuranyl, 2,3-dihydrofuranyl, 2H-pyranyl, tetrahydropyranyl, thiiranyl, thietanyl, tetrahydrothietanyl, aziridinyl, azetidinyl, 1-methyl-2-pyrrolyl, piperazinyl and piperidinyl.
  • a “heterocycloalkyl” group is a heterocycle group as defined above covalently bonded to an alkyl group as defined above.
  • Particular 5-membered heterocycles containing a sulfur or oxygen atom and one to three nitrogen atoms are thiazolyl, in particular thiazol-2-yl and thiazol-2-yl N-oxide, thiadiazolyl, in particular 1,3,4-thiadiazol-5-yl and 1,2,4-thiadiazol-5-yl, oxazolyl, for example oxazol-2-yl, and oxadiazolyl, such as 1,3,4-oxadiazol-5-yl, and 1,2,4-oxadiazol-5-yl.
  • Particular 5-membered ring heterocycles containing 2 to 4 nitrogen atoms include imidazolyl, such as imidazol-2-yl; triazolyl, such as 1,3,4-triazol-5-yl; 1,2,3-triazol-5-yl, 1,2,4-triazol-5-yl, and tetrazolyl, such as 1H-tetrazol-5-yl.
  • Particular benzo-fused 5-membered heterocycles are benzoxazol-2-yl, benzthiazol-2-yl and benzimidazol-2-yl.
  • Particular 6-membered heterocycles contain one to three nitrogen atoms and optionally a sulfur or oxygen atom, for example pyridyl, such as pyrid-2-yl, pyrid-3-yl, and pyrid4-yl; pyrimidyl, such as pyrimid-2-yl and pyrimid4-yl; triazinyl, such as 1,3,4-triazin-2-yl and 1,3,5-triazin-4-yl; pyridazinyl, in particular pyridazin-3-yl, and pyrazinyl.
  • pyridyl such as pyrid-2-yl, pyrid-3-yl, and pyrid4-yl
  • pyrimidyl such as pyrimid-2-yl and pyrimid4-yl
  • triazinyl such as 1,3,4-triazin-2-yl and 1,3,5-triazin-4-yl
  • pyridine N-oxides and pyridazine N-oxides and the pyridyl, pyrimid-2-yl, pyrimid4-yl, pyridazinyl and the 1,3,4-triazin-2-yl groups are a particular group.
  • Substituents for “optionally substituted heterocycles”, and further examples of the 5- and 6-membered ring systems discussed above can be found in W. Druckheimer et al., U.S. Pat. No. 4,278,793.
  • such optionally substittuted heterocycle groups are substituted with hydroxyl, alkyl, alkoxy, acyl, halogen, mercapto, oxo, carboxyl, acyl, halo-substituted alkyl, amino, cyano, nitro, amidino and guanidino.
  • Heteroaryl alone and when used as a moiety in a complex group such as a heteroaralkyl group, refers to any mono-, bi-, or tricyclic aromatic ring system having the number of atoms designated where at least one ring is a 5-, 6- or 7-membered ring containing from one to four heteroatoms selected from the group nitrogen, oxygen, and sulfur, and in a particular embodiment at least one heteroatom is nitrogen ( Lang's Handbook of Chemistry, supra ). Included in the definition are any bicyclic groups where any of the above heteroaryl rings are fused to a benzene ring. Particular heteroaryls incorporate a nitrogen or oxygen heteroatom.
  • heteroaryl whether substituted or unsubstituted groups denoted by the term “heteroaryl”: thienyl, furyl, imidazolyl, pyrazolyl, thiazolyl, isothiazolyl, oxazolyl, isoxazolyl, triazolyl, thiadiazolyl, oxadiazolyl, tetrazolyl, thiatriazolyl, oxatriazolyl, pyridyl, pyrimidyl, pyrazinyl, pyridazinyl, thiazinyl, oxazinyl, triazinyl, thiadiazinyl, oxadiazinyl, dithiazinyl, dioxazinyl, oxathiazinyl, tetrazinyl, thiatriazinyl, oxatriazinyl, dithiadiazinyl
  • a particular “heteroaryl” is: 1,3-thiazol-2-yl, 4-(carboxymethyl)-5-methyl- 1,3-thiazol-2-yl, 4-(carboxymethyl)-5-methyl-1,3-thiazol-2-yl sodium salt, 1,2,4-thiadiazol-5-yl, 3-methyl- 1,2,4-thiadiazol-5-yl, 1,3,4-triazol-5-yl, 2-methyl-1,3,4-triazol-5-yl, 2-hydroxy-1,3,4-triazol-5-yl, 2-carboxy-4-methyl-1,3,4-triazol-5-yl sodium salt, 2-carboxy4-methyl-1,3,4-triazol-5-yl, 1,3-oxazol-2-yl, 1,3,4-oxadiazol-5-yl, 2-methyl-1,3,4-oxadiazol-5-yl, 2-(hydroxymethyl)-1,3,4-oxadiazol-5-yl, 1,2,4-oxadiazol-5-yl, 1,3,
  • heteroaryl includes; 4-(carboxymethyl)-5-methyl-1,3-thiazol-2-yl, 4-(carboxymethyl)-5-methyl-1,3-thiazol-2-yl sodium salt, 1,3,4-triazol-5-yl, 2-methyl-1,3,4-triazol-5-yl, 1H-tetrazol-5-yl, 1-methyl-1H-tetrazol-5-yl, 1-(1-(dimethylamino)eth-2-yl)-1H-tetrazol-5-yl, 1-(carboxymethyl)-1H-tetrazol-5-yl, 1-(carboxymethyl)-1H-tetrazol-5-yl sodium salt, 1-(methylsulfonic acid)-1H-tetrazol-5-yl, 1-(methylsulfonic acid)-1H-tetrazol-5-yl sodium salt, 1,2,3-triazol-5-yl, 1,4,5,6-tetrahydro-5,6-di
  • “Inhibitor” means a compound which reduces or prevents the binding of IAP proteins to caspase proteins or which reduces or prevents the inhibition of apoptosis by an IAP protein.
  • “inhibitor” means a compound which prevents the binding interaction of X-IAP with caspases or the binding interaction of ML-IAP with SMAC.
  • Optionally substituted unless otherwise specified means that a group may be substituted by one or more (e.g. 0, 1, 2, 3 or 4) of the substituents listed for that group in which said substituents may be the same or different. In an embodiment an optionally substituted group has 1 substituent. In another embodiment an optionally substituted group has 2 substituents. In another embodiment an optionally substituted group has 3 substituents.
  • “Pharmaceutically acceptable salts” include both acid and base addition salts.
  • “Pharmaceutically acceptable acid addition salt” refers to those salts which retain the biological effectiveness and properties of the free bases and which are not biologically or otherwise undesirable, formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, carbonic acid, phosphoric acid and the like, and organic acids may be selected from aliphatic, cycloaliphatic, aromatic, araliphatic, heterocyclic, carboxylic, and sulfonic classes of organic acids such as formic acid, acetic acid, propionic acid, glycolic acid, gluconic acid, lactic acid, pyruvic acid, oxalic acid, malic acid, maleic acid, maloneic acid, succinic acid, fumaric acid, tartaric acid, citric acid, aspartic acid, ascorbic acid, glutamic acid, anthranilic acid, benzoic acid, cinnamic acid
  • “Pharmaceutically acceptable base addition salts” include those derived from inorganic bases such as sodium, potassium, lithium, ammonium, calcium, magnesium, iron, zinc, copper, manganese, aluminum salts and the like. Particularly base addition salts are the ammonium, potassium, sodium, calcium and magnesium salts.
  • Salts derived from pharmaceutically acceptable organic nontoxic bases includes salts of primary, secondary, and tertiary amines, substituted amines including naturally occurring substituted amines, cyclic amines and basic ion exchange resins, such as isopropylamine, trimethylamine, diethylamine, triethylamine, tripropylamine, ethanolamine, 2-diethylaminoethanol, trimethamine, dicyclohexylamine, lysine, arginine, histidine, caffeine, procaine, hydrabamine, choline, betaine, ethylenediamine, glucosamine, methylglucamine, theobromine, purines, piperizine, piperidine, N-ethylpiperidine, polyamine resins and the like.
  • Particularly organic non-toxic bases are isopropylamine, diethylamine, ethanolamine, trimethamine, dicyclohexylamine, choline, and caffeine.
  • “Sulfonyl” means a —SO 2 —R group wherein R is alkyl, carbocycle, heterocycle, carbocycloalkyl or heterocycloalkyl.
  • Particular sulfonyl groups are alkylsulfonyl (i.e. —SO 2 -alkyl), for example methylsulfonyl; arylsulfonyl, for example phenylsulfonyl; aralkylsulfonyl, for example benzylsulfonyl.
  • salts and solvates thereof as used herein means that compounds of the inventions may exist in one or a mixture of salts and solvate forms.
  • a compound of the invention may be substantially pure in one particular salt or solvate form or else may be mixtures of two or more salt or solvate forms.
  • the present invention provides novel compounds having the general formula I: wherein A, Q, X 1 , X 2 , Y, R 1 , R 2 , R 3 , R 4 , R 4 ′, R 5 , R 6 and R 6 ′ are as described herein.
  • Ring A is a 5-member aromatic heterocycle incorporating 1 to 4 heteroartoms N, O or S which is substituted with group Q and is optionally further substituted with one or more R 7 (for substitutions at a ring carbon atom) and one or more R 8 (for substitutions at a ring nitrogen).
  • R 7 in each occurrence is independently H, cyano, hydroxyl, mercapto, halogen, nitro, carboxyl, amidino, guanidino, alkyl, a carbocycle, a heterocycle or —U—V; wherein U is —O—, —S—, —S(O)—, S(O) 2 , —N(R 8 )—, —C(O)—, —C(O)—NR 8 —, —NR 8 —C(O)—, —SO 2 —NR 8 —, —NR 8 —SO 2 —, —NR 8 —C(O)—NR 8 —, —NR 8 —C(NH)—NR 8 —, —NR 8 —C(NH)—, —C(O)—O— or —O—C(O)— and V is alkyl, a carbocycle or a heterocycle; and wherein one or more CH 2 or CH groups of an alky
  • Substituents of the “optionally substituted carbocycle” and “optionally substituted heterocycle” are as defined herein.
  • such carbocycle and heterocycle groups are substituted with hydroxyl, alkyl, alkoxy, acyl, halogen, mercapto, oxo, carboxyl, acyl, halo-substituted alkyl, amino, cyano, nitro, amidino and guanidino.
  • R 7 is H, halogen, cyano, alkyl, hydroxyalkyl or alkoxyalkyl.
  • R 8 is H, alkyl, a carbocycle or a heterocycle wherein one or more CH 2 or CH groups of said alkyl is optionally replaced with —O—, —S—, —S(O)—, S(O) 2 , —N(R 8 ), or —C(O)—; and said alkyl, carbocycle and heterocycle is optionally substituted with hydroxyl, alkoxy, acyl, halogen, mercapto, oxo ( ⁇ O), carboxyl, acyl, halo-substituted alkyl, amino, cyano nitro, amidino, guanidino an optionally substituted carbocycle or an optionally substituted heterocycle.
  • Substituents of the “optionally substituted carbocycle” and “optionally substituted heterocycle” are as defined herein.
  • such carbocycle and heterocycle groups are substituted with hydroxyl, alkyl, alkoxy, acyl, halogen, mercapto, oxo, carboxyl, acyl, halo-substituted alkyl, amino, cyano, nitro, amidino and guanidino.
  • R 8 is H, alkyl, or acyl.
  • R 8 is methyl.
  • R 8 is acetyl.
  • R 8 is H.
  • R 7 is H, halogen, amino, hydroxyl, carboxyl, alkyl, haloalkyl or aralkyl.
  • R 7 is halogen, for example Cl or F.
  • R 7 is H. It is understood that substitutions defined for R 7 and R 8 as well as all other variable groups herein are subject to permissible valency.
  • ring A has the general formula II: wherein Z 1 is NR 8 , O or S; and Z 2 , Z 3 and Z 4 are each independently N or CR 7 .
  • Group Q is attached to ring A of formula II and II′ at the ring member between Z 2 and Z 3 .
  • Z 1 is S.
  • Z 1 is O.
  • Z 1 is NR 8 wherein R 8 is as defined herein.
  • Z 1 is NR 8 wherein R 8 is H.
  • Z 1 is NR 8 wherein R 8 is Me.
  • Z 1 is O or S while Z 2 is N and Z 3 is N or CR 7 .
  • Z 1 is S while Z 2 is N and Z 3 is CR 7 .
  • Z 1 is S while Z2 is N and Z 3 is CH.
  • ring A is an aromatic heterocyle selected from the group consisting of IIa-IIcc: wherein R 7 and R 8 are as defined herein. Q is not part of ring A and is shown for positional purposes.
  • ring A is any one of the groups IIa-IIz wherein R 8 is H and R 7 is H, Cl, or hydroxypropynyl.
  • ring A is any one of the groups IIa-IIz wherein R 7 and R 8 are both H.
  • ring A is the IIg.
  • ring A is IIg and R 7 is H.
  • Q is H, alkyl, a carbocycle, a heterocycle; wherein one or more CH 2 or CH groups of an alkyl is optionally replaced with —O—, —S—, —S(O)—, S(O) 2 , —N(R 8 )—, —C(O)—, —C(O)—NR 8 —, —NR 8 —C(O)—, —SO 2 —NR 8 —, —NR 8 —SO 2 —, —NR 8 —C(O)—NR 8 —, —NR 8 —C(NH)—NR 8 —, —NR 8 —C(NH)—, —C(O)—O— or —O—C(O)—; and wherein any of the foregoing alkyl, carbocycle and heterocycle is optionally substituted with one or more hydroxyl, alkoxy, acyl, halogen, mercapto, oxo, carboxyl, acyl,
  • Substituents of the “optionally substituted carbocycle” and “optionally substituted heterocycle” are as defined herein.
  • such carbocycle and heterocycle groups are substituted with hydroxyl, alkyl, alkoxy, acyl, halogen, mercapto, oxo, carboxyl, acyl, halo-substituted alkyl, amino, cyano, nitro, amidino and guanidino.
  • Q is a carbocycle or heterocycle optionally substituted with halogen, amino, oxo, alkyl, a carbocycle or a heterocycle; wherein one or more CH 2 or CH groups of an alkyl is optionally replaced with —O—, —S—, —S(O)—, S(O) 2 , —N(R 8 )—, —C(O)—, —C(O)—NR 8 —, —NR 8 —C(O)—, —SO 2 —NR 8 —, —NR 8 —SO 2 —, —NR 8 —C(O)—NR 8 —, —NR 8 —C(NH)—NR 8 —, —NR 8 —C(NH)—, —C(O)—O— or —O—C(O)—; and wherein said alkyl, carbocycle or heterocycle is optionally substituted with halogen, amino, hydroxyl, mercapto, carb
  • Q is a carbocycle or heterocycle selected from the group consisting of IIIa-IIIs: wherein n is 1-4, for example 1-3, for example 1-2, for example 1; T is O, S, NR 8 or CR 7 R 7 ; W is O, NR 8 or CR 7 R 7 ; and R 7 and R 8 are as defined herein.
  • Q is any one of IIIa-IIIi wherein R 8 is H and R 7 is selected from the group consisting of H, F, Cl, Me, methoxy, hydroxyethoxy, methoxyethoxy, acetoxyethoxy, methylsulfonyl methylsulfonylmethyl, phenyl and morpholin4-yl.
  • Q is IIId.
  • Q is IIId which is substituted at the 4-position with R 7 .
  • Q is IIId which is substituted at the 5-position with R 7 .
  • X 1 and X 2 are each independently O or S. In a particular embodiment, X 1 and X 2 are both O. In another particular embodiment X 1 and X 2 are both S. In another particular embodiment, X 1 is S while X 2 is O. In another particular embodiment, X 1 is O while X 2 is S.
  • Y is a bond, (CR 7 R 7 ) n , O or S; wherein n is 1 or 2 and R 7 is H, halogen, alkyl, aryl, aralkyl, amino, arylamino, alkylamino, aralkylamino, alkoxy, aryloxy or aralkyloxy.
  • Y is (CHR 7 ) n , O or S; wherein n is 1 or 2 and R 7 is H, halogen, alkyl, aryl, aralkyl, amino, arylamino, alkylamino, aralkylamino, alkoxy, aryloxy or aralkyloxy.
  • Y is CH 2 .
  • n is 1.
  • Y is a bond.
  • n is 1 and Y is CHR 7 wherein R 7 is aralkyloxy, for example benzyloxy.
  • n is 1 and Y is CHR 7 wherein R 7 is F.
  • n is 1 and Y is CHR 7 wherein R 7 is aralkylamino, for example benzylamino.
  • Y is O.
  • Y is S.
  • R 2 is alkyl, a carbocycle, carbocyclylalkyl, a heterocycle or heterocyclylalkyl each optionally substituted with halogen, hydroxyl, oxo, thione, mercapto, carboxyl, alkyl, haloalkyl, alkoxy, alkylthio, sulfonyl, amino and nitro.
  • R 2 is alkyl, a carbocycle, carbocyclylalkyl, a heterocycle or heterocyclylalkyl each optionally substituted with halogen, hydroxyl, oxo, mercapto, thione, carboxyl, alkyl, haloalkyl, alkoxy, alkylthio, sulfonyl, amino and nitro.
  • R 2 is alkyl, a carbocycle, carbocyclylalkyl, a heterocycle or heterocyclylalkyl each optionally substituted with halogen, hydroxyl, mercapto, carboxyl, alkyl, alkoxy, amino and nitro.
  • R 2 is alkyl, cycloalkyl, cycloalkylalkyl, aryl, aralkyl, a heterocycle or heterocyclylalkyl. In a particular embodiment R 2 is alkyl, cycloalkyl or a heterocycle.
  • R 2 is selected from the group consisting of t-butyl, isopropyl, cyclohexyl, tetrahydropyran-4-yl, N-methylsulfonylpiperidin-4-yl, tetrahydrothiopyran-4-yl, tetrahydrothiopyran-4-yl (in which the S is in oxidized form SO or SO 2 ), cyclohexan-4-one, 4-hydroxycyclohexane, 4-hydroxy-4-methylcyclohexane, 1-methyl-tetrahydropyran-4-yl, 2-hydroxyprop-2-yl, but-2-yl, phenyl and 1-hydoxyeth-1-yl.
  • R 2 is t-butyl, isopropyl, cyclohexyl, cyclopentyl, phenyl or tetrahydropyran-4-yl.
  • R 2 is phenyl.
  • R 2 is cyclohexyl.
  • R 2 is tetrahydropyran-4-yl.
  • R 2 is isopropyl (i.e. the valine amino acid side chain).
  • R 2 is t-butyl.
  • R 2 is oriented such that the amino acid, or amino acid analogue, which it comprises is in the L-configuration.
  • R 3 is H or alkyl optionally substituted with halogen or hydroxyl; or R 3 and R4 together form a 3-6 heterocycle.
  • R 3 is H or alkyl; or R 3 and R 4 together form a 3-6 heterocycle.
  • R 3 is H or methyl, ethyl, propyl or isopropyl.
  • R 3 is H or methyl.
  • R 3 is methyl.
  • R 3 is ethyl.
  • R 3 is fluoromethyl.
  • R 3 is hydroxyethyl.
  • R 3 is oriented such that the amino acid, or amino acid analogue, which it comprises is in the L-configuration.
  • R 3 and R 4 together with the atoms from which they depend form a 3-6 heterocycle.
  • R 3 and R 4 together form an azetidine ring.
  • R 3 and R 4 together form a pyrrolidine.
  • R 3 ′ is H, or R 3 and R 3 ′ together form a 3-6 carbocycle.
  • R 3 ′ is H.
  • R 3 and R 3 ′ together form a 3-6 carbocycle, for example a cyclopropyl ring.
  • R 3 and R 3 ′ are both methyl.
  • R 4 and R 4 ′ are independently H, hydroxyl, amino, alkyl, carbocycle, carbocycloalkyl, carbocycloalkyloxy, carbocycloalkyloxycarbonyl, heterocycle, heterocycloalkyl, heterocycloalkyloxy or heterocycloalkyloxycarbonyl; wherein each alkyl, carbocycloalkyl, carbocycloalkyloxy, carbocycloalkyloxycarbonyl, heterocycle, heterocycloalkyl, heterocycloalkyloxy and heterocycloalkyloxycarbonyl is optionally substituted with halogen, hydroxyl, mercapto, carboxyl, alkyl, alkoxy, amino, imino and nitro; or R 4 and R 4 ′ together form a heterocycle.
  • R 4 and R 4 ′ are independently H, hydroxyl, amino, alkyl, aryl, aralkyl, cycloalkyl, cycloalkylalkyl, heteroaryl, or heteroarylalkyl wherein each alkyl, aryl, aralkyl, cycloalkyl, cycloalkylalkyl, heteroaryl and heteroarylalkyl is optionally substituted with halogen, hydroxyl, mercapto, carboxyl, alkyl, alkoxy, amino and nitro; or R 4 and R 4 ′ together form a heterocycle.
  • R 4 and R 4 ′ together form a heterocycle, for example an azetidine ring, or a pyrrolidine ring.
  • R 4 and R 4 ′ are both H.
  • R 4 is methyl and R 4 ′ is H.
  • one of R 4 and R 4 ′ is hydroxyl (OH) while the other is H.
  • one of R 4 and R 4 ′ is amino, such as NH 2 , NHMe and NHEt, while the other is H.
  • R 4 ′ is H and R 4 is H, alkyl, aryl, aralkyl, cycloalkyl, cycloalkylalkyl, heteroaryl or heteroarylalkyl.
  • R 4 is a group selected from the group consisting of: R 5 is H or alkyl.
  • R 5 is H or methyl.
  • R 5 is H.
  • R 5 is methyl.
  • R 6, and R 6 ′ are each independently H, alkyl, aryl or aralkyl.
  • R 6 is alkyl, for example methyl.
  • R 6 is aryl, for example phenyl.
  • R 6 is aralkyl, for example benzyl.
  • R 6 and R 6 ′ are the same, for example both alkyl, e.g. both methyl.
  • R 6 is methyl and R 6 ′ is H.
  • R6 and R 6 are both H.
  • Compounds of the invention contain one or more asymmetric carbon atoms. Accordingly, the compounds may exist as diastereomers, enantiomers or mixtures thereof.
  • the syntheses of the compounds may employ racemates, diastereomers or enantiomers as starting materials or as intermediates. Diastereomeric compounds may be separated by chromatographic or crystallization methods. Similarly, enantiomeric mixtures may be separated using the same techniques or others known in the art.
  • Each of the asymmetric carbon atoms may be in the R or S configuration and both of these configurations are within the scope of the invention.
  • compounds of the invention have the following stereochemical configuration of formula I′ wherein ring A, Q, X 1 , X 2 , Y, R 1 , R 2 , R 3 , R 4 , R 4 ′, R 5 , R 6 and R 6 ′ are as described herein.
  • compounds of the invention have the general formula IV wherein Q, X 1 , X 2 , Y, R 1 , R 2 , R 3 , R 4 , R 4 ′, R 5 , R 6 , R 6 and R 7 are as described herein.
  • Q is a carbocycle or a heterocycle optionally substituted with one or more hydroxyl, alkyl, alkoxy, acyl, halogen, mercapto, oxo, carboxyl, amino, cyano, nitro, amidino, guanidino an optionally substituted carbocycle or an optionally substituted heterocycle wherein one or more CH 2 or CH groups of said alkyl is optionally replaced with —O—, —S—, —S(O)—, S(O) 2 , —N(R 8 )—, —C(O)—, —C(O)—NR 8 —, —NR 8 —C(O)—, —SO 2 —NR 8 —, —NR 8 —SO 2 —, —NR 8 —C(O)—NR 8 —, —NR 8 —C(NH)—NR 8 —, —NR 8 —C(NH)—, —C(O)—O—
  • Q is aryl or heteroaryl optionally substituted with one or more hydroxyl, alkyl, alkoxy, acyl, halogen, mercapto, oxo, carboxyl, amino, cyano, nitro, amidino, guanidino an optionally substituted carbocycle or an optionally substituted heterocycle wherein one or more CH 2 or CH groups of said alkyl is optionally replaced with —O—, —S—, —S(O)—, S(O) 2 , —N(R 8 )—, —C(O)—, —C(O)—NR 8 —, —NR 8 —C(O)—, —SO 2 —NR 8 —, —NR 8 —SO 2 —, —NR 8 —C(O)—NR 8 —, —NR 8 —C(NH)—NR 8 —, —NR 8 —C(NH)—, —C(O)—O— or
  • Q is aryl or heteroaryl optionally substituted with with one or more hydroxyl, alkyl, alkoxy, alkoxyalkoxy, acyl, halogen, mercapto, carboxyl, acyl, halo-substituted alkyl, amino, cyano, nitro, amidino, guanidino.
  • Q is aryl or heteroaryl optionally substituted with halogen, alkyl, alkoxy, alkoxyalkoxy, cyano.
  • Q is IIIa to IIIs wherein R 7 , R 8 and n are as defined herein.
  • Q is IIIq.
  • Q is IIId.
  • Q is IIIb, IIIc, IIIe, IIIf, IIIj, IIIk, IIIl, IIIn, IIIo, IIIq, IIIr or IIIs.
  • R 1 is H.
  • R 2 is alkyl, a carbocycle, carbocyclylalkyl, a heterocycle or heterocyclylalkyl each optionally substituted with halogen, hydroxyl, mercapto, carboxyl, alkyl, alkoxy, amino and nitro.
  • R 3 is H or methyl, ethyl, propyl or isopropyl.
  • R 4 is methyl and R 4 ′ is H.
  • R 5 is H.
  • R 6 and R 6′ are both H.
  • R 7 is is H, halogen, cyano, alkyl, hydroxyalkyl or alkoxyalkyl.
  • X 1 and X 2 are both O.
  • Y is CH 2 .
  • prodrugs of the compounds described above include known amino-protecting and carboxy-protecting groups which are released, for example hydrolyzed, to yield the parent compound under physiologic conditions.
  • a particular class of prodrugs are compounds in which a nitrogen atom in an amino, amidino, aminoalkyleneamino, iminoalkyleneamino or guanidino group is substituted with a hydroxy (OH) group, an alkylcarbonyl (—CO—R) group, an alkoxycarbonyl (—CO—OR), an acyloxyalkyl-alkoxycarbonyl (—CO—O—R—O—CO—R) group where R is a monovalent or divalent group and as defined above or a group having the formula —C(O)—O—CP1P2-haloalkyl, where P1 and P2 are the same or different and are H, lower alkyl, lower alkoxy, cyano, halo lower alkyl or
  • the nitrogen atom is one of the nitrogen atoms of the amidino group of the compounds of the invention.
  • These prodrug compounds are prepared reacting the compounds of the invention described above with an activated acyl compound to bond a nitrogen atom in the compound of the invention to the carbonyl of the activated acyl compound.
  • Suitable activated carbonyl compounds contain a good leaving group bonded to the carbonyl carbon and include acyl halides, acyl amines, acyl pyridinium salts, acyl alkoxides, in particular acyl phenoxides such as p-nitrophenoxy acyl, dinitrophenoxy acyl, fluorophenoxy acyl, and difluorophenoxy acyl.
  • the reactions are generally exothermic and are carried out in inert solvents at reduced temperatures such as ⁇ 78 to about 50C.
  • the reactions are usually also carried out in the presence of an inorganic base such as potassium carbonate or sodium bicarbonate, or an organic base such as an amine, including pyridine, triethylamine, etc.
  • an inorganic base such as potassium carbonate or sodium bicarbonate
  • an organic base such as an amine, including pyridine, triethylamine, etc.
  • amino acid analogs may be coupled in any order and may be prepared using solid phase support which is routine in the art.
  • Scheme2 illustrates an alternative amino acid residue analogue coupling route.
  • the intermediate incorporating ring A is prepared from commercially available reagents employing standard organic chemistry techniques.
  • the intermediate may be prepared according to scheme 3. wherein Q, Y, R 1 , R 6 , and R 6 ′ are as defined herein and Pr is an amine protecting group.
  • a proline analogue wherein the alpha nitrogen is protected (Pr), for example with Boc or Cbz, and amidated is converted to the corresponding thioamide, for example using Lawesson's reagent according to the procedures described in Williams et al ( J. Org. Chem, 2001, 66:8463).
  • the thiamide is then cyclized with an appropriate bromide to give the desired thiazole substituted with group Q, for example using the procedures described in Ciufolini et al, (J. Org. Chem. 1997, 62: 3804).
  • the bromide in the present scheme may incorporate a functional group which may be used to couple a desired group Q to the thiazole formed from the cyclization step.
  • the intermediate may be prepared according to scheme 4. wherein Q, Y, R 1 , R 6 , and R 6 ′ are as defined herein and Pr is an amine protecting group.
  • the starting proline analogue is reacted with an appropriate amine using standard amide forming procedures.
  • the resulting amide is cyclized, for example using Burgess Reagent according to the procedures described in Pihko et al (J. Org. Chem., 1999, 64:652), to give the dihydro-oxazole.
  • the dihydro-oxazole is then reduced to give the desired oxazole substituted with group Q.
  • the amine of the first step in the present scheme may incorporate a functional group in place of Q which may be used directly or indirectly to couple a desired group Q to the thiazole formed from the cyclization step.
  • R 4 or R 4 ′ are other than H may be prepared according to standard organic chemistry techniques, for example by reductive amination in which a starting amino acid residue analog e.g. NH 2 —CH(R 3 )—C(O)—OH is reacted with a suitable aldehyde or ketone to give the desired R 4 and R 4 ′ substituents. See scheme 5. The resulting R 4 /R 4 ′ substituted amino acid intermediate can then be conjugated to the next amino acid intermediate or the remainder of the compound using standard peptide coupling procedures.
  • a starting amino acid residue analog e.g. NH 2 —CH(R 3 )—C(O)—OH
  • alanine is reacted with 1-methylindole-2-carboxaldehyde and reduced with sodium cyanoborohydride dissolved in 1% HOAc/DMF to give the N-substituted alanine residue which may be used in preparing compounds of the invention. See scheme 6.
  • the reductive amination procedure to introduce R 4/ R 4 ′ substituents is the final step in the preparation of the compound.
  • R 4 or R 4 ′ substituents other than H they may also be prepared by substitution of a suitable acid intermediate which incorporates a leaving group with a desired amine.
  • a suitable acid intermediate which incorporates a leaving group with a desired amine.
  • Br—CH(R 3 )—C(O)—OH is substituted with an amine R 4 —NH 2 or R 4 —NH—R 4 ′ according to scheme 7.
  • substitution reaction introducing R 4 or R 4 ′ substituents may be performed as a final step in the preparation of the compound as illustrated in scheme 8.
  • 2-bromopropionic acid is reacted with the following amines dissolved in DMF and bubbled for until substitution is complete to form N-substituted alanine residues:
  • X 1 or X 2 is sulfur
  • X 1 or X 2 is sulfur
  • compounds in which X 2 is sulfur can be prepared according to scheme 9 starting from an Fmoc protected amino acid residue analog NH 2 —CH(R 2 )—COOH which is dissolved in THF and cooled to ⁇ 25° C., with addition of DIPEA followed by addition of isobutylchloroformate. After 10 minutes, the diamine, 4-nitrobenzene-1,2-diamine, is added and the reaction mixture is continuously stirred at ⁇ 25° C. for 2 hours, then at room temperature overnight.
  • THF is vacuumed off and the mixture is then subjected to flash chromatography using 50% EtOAc/Hexane to yield the product.
  • the Fmoc-alanine derivative, phosphorus pentasulfide and sodium carbonate are mixed in THF and stirred overnight.
  • the solution is concentrated and direct chromatography using 80% EtOAc/Hexane yields the activated thioalanine.
  • the activated thioalanine and sodium nitrite are then mixed in acetic acid and diluted with H 2 O.
  • the resulting precipitant is filtered and dried to yield the product.
  • the thioalanine is coupled to an A ring substitued proline amino acid residue analog by dissolving both in DMF.
  • the thioamide product may then be deprotected with 20% PIP/DMA for 15 minutes and used to conjugate to the R 4 /R 4 ′—N—C(R 3 )(R 3 ′)—COOH.
  • the Fmoc-protected thioamide is first coupled to the A ring substituted proline amino acid residue analog followed by Fmoc deprotection and subsequent coupling to the R 4 /R 4 ′—R 4 /R 4 ′—N—C(R 3 )(R 3 ′)—COOH amino acid residue analog.
  • the compounds of the invention inhibit the binding of IAP proteins to caspases, in particular X-IAP binding interaction with caspases 3 and 7.
  • the compounds also inhibit the binding of ML-IAP to Smac protein.
  • the compounds of the invention are useful for inducing apoptosis in cells or sensitizing cells to apoptotic signals, in particular cancer cells.
  • Compounds of the invention are useful for inducing apoptosis in cells that overexpress IAP proteins.
  • compounds of the invention are useful for inducing apoptosis in cells in which the mitochondrial apoptotic pathway is disrupted such that release of Smac from ML-IAP proteins is inhibited, for example by up regulation of Bcl-2 or down regulation of Bax/Bak. More broadly, the compounds can be used for the treatment of all cancer types which fail to undergo apoptosis.
  • cancer types include neuroblastoma, intestine carcinoma such as rectum carcinoma, colon carcinoma, familiary adenomatous polyposis carcinoma and hereditary non-polyposis colorectal cancer, esophageal carcinoma, labial carcinoma, larynx carcinoma, hypopharynx carcinoma, tong carcinoma, salivary gland carcinoma, gastric carcinoma, adenocarcinoma, medullary thyroidea carcinoma, papillary thyroidea carcinoma, renal carcinoma, kidney parenchym carcinoma, ovarian carcinoma, cervix carcinoma, uterine corpus carcinoma, endometrium carcinoma, chorion carcinoma, pancreatic carcinoma, prostate carcinoma, testis carcinoma, breast carcinoma, urinary carcinoma, melanoma, brain tumors such as glioblastoma, astrocytoma, meningioma, medulloblastoma and peripheral neuroectodermal tumors, Hodgkin lymphoma, non-Hodgkin lymphoma, Burkitt lymphoma
  • cytostatic chemotherapy compounds include, but are not limited to (i) antimetabolites, such as cytarabine, fludarabine, 5-fluoro-2′-deoxyuiridine, gemcitabine, hydroxyurea or methotrexate; (ii) DNA-fragmenting agents, such as bleomycin, (iii) DNA-crosslinking agents, such as chlorambucil, cisplatin, cyclophosphamide or nitrogen mustard; (iv) intercalating agents such as adriamycin (doxorubicin) or mitoxantrone; (v) protein synthesis inhibitors, such as L-asparaginase, cycloheximide, puromycin or diphtheria toxin; (Vi) topoi
  • antimetabolites such as cytarabine, fludarabine, 5-fluoro-2′-deoxyuiridine, gemcitabine, hydroxyurea or methotrexate
  • DNA-fragmenting agents such as
  • compounds of the present invention are coadministered with a cytostatic compound selected from the group consisting of cisplatin, doxorubicin, taxol, taxotere and mitomycin C.
  • a cytostatic compound selected from the group consisting of cisplatin, doxorubicin, taxol, taxotere and mitomycin C.
  • the cytostatic compound is doxorubicin.
  • Another class of active compounds which can be used in the present invention are those which are able to sensitize for or induce apoptosis by binding to death receptors (“death receptor agonists”).
  • death receptor agonists include death receptor ligands such as tumor necrosis factor a (TNF- ⁇ ), tumor necrosis factor ⁇ (TNF- ⁇ , lymphotoxin- ⁇ ), LT- ⁇ (lymphotoxin- ⁇ ), TRAIL (Apo2L, DR4 ligand), CD95 (Fas, APO-1) ligand, TRAMP (DR3, Apo-3) ligand, DR6 ligand as well as fragments and derivatives of any of said ligands.
  • TNF- ⁇ tumor necrosis factor a
  • TNF- ⁇ tumor necrosis factor ⁇
  • TNF- ⁇ tumor necrosis factor ⁇
  • lymphotoxin- ⁇ lymphotoxin- ⁇
  • LT- ⁇ lymphotoxin- ⁇
  • TRAIL Ap
  • the death receptor ligand is TNF- ⁇ .
  • the death receptor ligand is Apo2L/TRAIL.
  • death receptors agonists comprise agonistic antibodies to death receptors such as anti-CD95 antibody, anti-TRAIL-R1 (DR4) antibody, anti-TRAIL-R2 (DR5) antibody, anti-TRAIL-R3 antibody, anti-TRAIL-R4 antibody, anti-DR6 antibody, anti-TNF-R1 antibody and anti-TRAMP (DR3) antibody as well as fragments and derivatives of any of said antibodies.
  • the compounds of the present invention can be also used in combination with radiation therapy.
  • radiation therapy refers to the use of electromagnetic or particulate radiation in the treatment of neoplasia. Radiation therapy is based on the principle that high-dose radiation delivered to a target area will result in the death of reproducing cells in both tumor and normal tissues.
  • the radiation dosage regimen is generally defined in terms of radiation absorbed dose (rad), time and fractionation, and must be carefully defined by the oncologist.
  • the amount of radiation a patient receives will depend on various consideration but the two most important considerations are the location of the tumor in relation to other critical structures or organs of the body, and the extent to which the tumor has spread.
  • radiotherapeutic agents are provided in, but not limited to, radiation therapy and is known in the art (Hellman, Principles of Radiation Therapy, Cancer, in Principles I and Practice of Oncology, 24875 (Devita et al., 4th ed., vol 1, 1993).
  • Recent advances in radiation therapy include three-dimensional conformal external beam radiation, intensity modulated radiation therapy (IMRT), stereotactic radiosurgery and brachytherapy (interstitial radiation therapy), the latter placing the source of radiation directly into the tumor as implanted “seeds”.
  • IMRT intensity modulated radiation therapy
  • stereotactic radiosurgery stereotactic radiosurgery
  • brachytherapy interstitial radiation therapy
  • Ionizing radiation with beta-emitting radionuclides is considered the most useful for radiotherapeutic applications because of the moderate linear energy transfer (LET) of the ionizing particle (electron) and its intermediate range (typically several millimeters in tissue).
  • LET linear energy transfer
  • Gamma rays deliver dosage at lower levels over much greater distances.
  • Alpha particles represent the other extreme, they deliver very high LET dosage, but have an extremely limited range and must, therefore, be in intimate contact with the cells of the tissue to be treated.
  • alpha emitters are generally heavy metals, which limits the possible chemistry and presents undue hazards from leakage of radionuclide from the area to be treated. Depending on the tumor to be treated all kinds of emitters are conceivable within the scope of the present invention.
  • the present invention encompasses types of non-ionizing radiation like e.g. ultraviolet (UV) radiation, high energy visible light, microwave radiation (hyperthermia therapy), infrared (IR) radiation and lasers.
  • UV radiation is applied.
  • the invention also includes pharmaceutical compositions or medicaments containing the compounds of the invention and a therapeutically inert carrier, diluent or excipient, as well as methods of using the compounds of the invention to prepare such compositions and medicaments.
  • the compounds of formula I used in the methods of the invention are formulated by mixing at ambient temperature at the appropriate pH, and at the desired degree of purity, with physiologically acceptable carriers, i.e., carriers that are non-toxic to recipients at the dosages and concentrations employed into a galenical administration form.
  • physiologically acceptable carriers i.e., carriers that are non-toxic to recipients at the dosages and concentrations employed into a galenical administration form.
  • the pH of the formulation depends mainly on the particular use and the concentration of compound, but may range anywhere from about 3 to about 8.
  • Formulation in an acetate buffer at pH 5 is a suitable embodiment.
  • the inhibitory compound for use herein is sterile. The compound ordinarily will be stored as a solid composition, although lyophilized formulations or a
  • composition of the invention will be formulated, dosed, and administered in a fashion consistent with good medical practice.
  • Factors for consideration in this context include the particular disorder being treated, the particular mammal being treated, the clinical condition of the individual patient, the cause of the disorder, the site of delivery of the agent, the method of administration, the scheduling of administration, and other factors known to medical practitioners.
  • the “effective amount” of the compound to be administered will be governed by such considerations, and is the minimum amount necessary to inhibit IAP interaction with caspases, induce apoptosis or sensitize a malignant cell to an apoptotic signal. Such amount is may be below the amount that is toxic to normal cells, or the mammal as a whole.
  • the initial pharmaceutically effective amount of the compound of the invention administered parenterally per dose will be in the range of about 0.01-100 mg/kg, for example about 0.1 to 20 mg/kg of patient body weight per day, with the typical initial range of compound used being 0.3 to 15 mg/kg/day.
  • Oral unit dosage forms, such as tablets and capsules, may contain from about 25 to about 1000 mg of the compound of the invention.
  • the compound of the invention may be administered by any suitable means, including oral, topical, transdermal, parenteral, subcutaneous, intraperitoneal, intrapulmonary, and intranasal, and, if desired for local treatment, intralesional administration.
  • Parenteral infusions include intramuscular, intravenous, intraarterial, intraperitoneal, or subcutaneous administration.
  • An example of a suitable oral dosage form is a tablet containing about 25 mg, 50 mg, 100 mg, 250 mg, or 500 mg of the compound of the invention compounded with about 90-30 mg anhydrous lactose, about 5-40 mg sodium croscarmellose, about 5-30 mg polyvinylpyrrolidone (PVP) K30, and about 1-10 mg magnesium stearate.
  • PVP polyvinylpyrrolidone
  • the powdered ingredients are first mixed together and then mixed with a solution of the PVP.
  • the resulting composition can be dried, granulated, mixed with the magnesium stearate and compressed to tablet form using conventional equipment.
  • An aerosol formulation can be prepared by dissolving the compound, for example 5-400 mg, of the invention in a suitable buffer solution, e.g. a phosphate buffer, adding a tonicifier, e.g. a salt such sodium chloride, if desired.
  • the solution is typically filtered, e.g. using a 0.2 micron filter, to remove impurities and contaminants.
  • Phenyl magnesium bromide (2.1 mL of 1.0 M solution in THF, 2.1 mmol) was added dropwise to a cold ( ⁇ 78° C.) solution of ester c (360 mg, 1.0 mmol) in THF (5 mL) over 5 min. The cooling bath was removed and the solution allowed to reach room temperature, at which time it was poured into saturated aqueous NH 4 Cl (50 mL). The aqueous layer was extracted with 50% ethyl acetate-hexanes (3 ⁇ 10 mL). The combined organic layers were dried (Na 2 SO 4 ), filtered, and concentrated. The residue was purified by flash chromatography (SiO 2 , gradient elution, 30-40% ethyl acetate-hexanes) to afford 404 mg (84%) of thiazole d as a colorless solid.
  • Triethylsilane (850 ⁇ l, 5.3 mmol) and TFA (5 mL) were added sequentially to alcohol d, and the resulting solution was allowed stand at rt for 1 h. The solvent was evaporated, and the residue purified by flash chromatography (SiO 2 , 30% ethyl acetate-hexanes) to afford a quantitative yield of compound e as a colorless oil.
  • Phenylmagnesium bromide (4.4 mL of 1.0 M solution in THF, 4.4 mmol) was added dropwise to a cold ( ⁇ 78° C.) solution of ester e (600 mg, 2.0 mmol) in THF (10 mL) over 5 min. The cooling bath was removed and the solution allowed to reach rt, at which time it was poured into saturated aqueous NH 4 Cl (50 mL). The aqueous layer was extracted with 50% ethyl acetate-hexanes (3 ⁇ 10 mL). The combined organic layers were dried (Na 2 SO 4 ), filtered, and concentrated.
  • Triethylsilane (20 ⁇ l) and TFA (1 mL) were added sequentially to a solution of alcohol f (50 mg, 0.1 mmol) and CH 2 Cl 2 (1 mL). The resulting solution was allowed stand at rt for 1 h. The solvent was evaporated, and the residue partitioned between EtOAc (20 mL) and 1N NaOH (20 mL). The organic phase was washed with 1N NaOH (2 ⁇ 20 mL).
  • the mixture was adsorbed onto Celite, and chromatographed (ISCO, 120 g silica column, 0-20% EtOAc-hexanes) to afford 1.15 g (55%) of the nitrile g as a yellow solid.
  • Methylmagnesium chloride (8.5 mL of 3 M solution in THF, 25.5 mmol) was added dropwise to a cold (0° C.) solution of amide z (2.5 g, 8.5 mmol) and THF (80 mL). The resulting solution was stirred at 0° C. for 1 h, then allowed to warm to room temperature. After 2.5 h, it was quenched by slow addition of aqueous AcOH (50%, 10 mL), diluted with water (100 mL), and separated. The aqueous layer was extracted with EtOAc (1 ⁇ 100 mL). The combined organic layers were washed with brine, dried (MgSO 4 ), filtered, and concentrated in vacuo to afford 1.9 g (90%) of ketone a′ as a yellow solid.
  • Trimethylsilyl cyanide (4.5 mL, 34.1 mmol) was added slowly into a mixture of 5-methoxy-l-tetralone d′ (5.0 g, 28.4 mmol), catalytic ZnI 2 in toluene (12 mL). The resulting mixture was stirred at room temperature for 24 h. Pyridine (40 mL) and POCl 3 (8.0 mL, 85.2 mmol) were added, and the mixture was heated to reflux for 8 h. The cooled dark solution was poured into ice water (300 mL) and conc.
  • nitrile f′ (2.20 g, 12.0 mmol) afforded 1.64 g (68%) of ketone g as a brown oil.
  • Trifluoroacetic acid (3.85 mL, 50 mmol) was added to a stirred solution of fluoro compound l′ (1.23 g, 5.0 mmol) in CH 2 Cl 2 (50 mL) at rt. After stirring for 3 h, the solution was concentrated in vacuo to afford 0.95 g (100%) of fluoro acid m′ as an oil, which was carried on.
  • chloro compound q′ (2.63 g, 14.1 mmol) afforded 2.1 g (74%) of chloro ketone r′ as a yellow liquid.
  • the mixture was diluted with 1 ⁇ 2-saturated ammonium chloride and filtered through a pad of celite.
  • the aqueous mixture was extracted with 70% diethyl ether in hexane (3 ⁇ 20 mL), dried (Na 2 SO 4 ), filtered, adsorbed on to Celite, and chromatographed (ISCO, 40 g column and a solvent gradient of 0-11% ethyl acetate in hexane after flushing with hexane for 3 minutes).
  • Terminal alkyne product 27 mg (5%) was isolated along with 200 mg of silyl derivative.
  • the TMS group was removed from this material by treatment with potassium carbonate (200 mg) in methanol (5 mL) for 3 hours at rt.
  • Terminal alkyne m 50 mg, 0.12 mmol was dissolved in THF (0.3 mL) and cooled to ⁇ 78° C.
  • LHMDS (0.15 mL of a 1.0 M solution of in THF, 0.15 mmol) was added dropwise and allowed to stir for 10 minutes.
  • Methyl iodide (0.1 mL, excess) was added, the reaction was stirred for 10 minutes at ⁇ 78° C. and then allowed to gradually warm to rt, over 45 minutes.
  • Typical HATU coupling A mixture of amine a (169 mg, 0.59 mmol), N-Boc-t-butly glycine (150 mg, 0.65 mmol), HATU (450 mg, 1.18 mmol), DIPEA (200 ⁇ l, 1.18 mmol) and DMF (2 mL) was maintained at rt for 2 h. The solution was diluted with ethyl acetate (50 mL) and washed with 1 N HCl (3 ⁇ 10 mL), 1 N NaOH (3 ⁇ 5 mL), brine (1 ⁇ 10 mL), dried (Na 2 SO 4 ), filtered, and concentrated. The residue was purified by flash chromatography (SiO— 2 , 10-15-20% ethyl acetate-hexanes) to afford 286 mg (97%) of amide b as a colorless solid.
  • Boc amine b (317 mg, 0.64 mmol) afforded a quantitative yield of amine c as a colorless solid.
  • the solid residue was purified by reverse-phase HPLC (C 18 , MeCN—H 2 O, 0.1% TFA) and the solvents removed by lyophylization to provide 1.2 g (43%) of dipeptide N-Boc-N-methyl-L-alanine-L-cyclohexylglycine as a white powder.
  • the amine b prepared above was combined with CH 2 Cl 2 (40 mL), saturated aqueous NaHCO 3 (40 mL) and cooled to 0° C. Benzyloxy carbonyl chloride (3.0 mL) was then added dropwise and the mixture stirred vigorously overnight. The phases were separated and the aqueous phase extracted with CH 2 Cl 2 (3 ⁇ 20 mL).
  • a particular procedure for convergent coupling A mixture of amine h (69 mg, 0.26 mmol), dipeptide N-Boc-N-methyl-L-alanine-L-cyclohexylglycine from example 7 (60 mg, 0.23 mmol), HOAt (Carpino, L. A.; El-Faham, A. Tetrahedron, 1999, 55, 6813) (47 mg, 0.24 mmol), DIC (53 ⁇ l, 0.34 mmol) and CH 2 Cl 2 (2 mL) was maintained at rt overnight.
  • the mixture was adsorbed onto Celite and purified by chromatography (ISCO, 4 g silica column, gradient elution 5-50% EtOAc-hexanes) to afford 94 mg of the product i as a colorless solid contaminated with diisopropyl urea.
  • the mixture was carried on directly to the next step.
  • the starting acid a (6.6 g, 30.4 mmol) was treated with thionyl chloride (50 mL), CHCl 3 (50 mL), and 1 drop of DMF at 78° C. for 5 h.
  • the resulting mixture was concentrated in vacuo, dried under high vacuum for overnight.
  • the resulting yellow solid was cooled in an ice-water bath and MeOH (200 mL) was added slowly. This was then refluxed for 1 h. After cooled to RT, the resulting precipitate was collected by filtration, washed with cold MeOH, and dried to afford 5.0 g (71%) of ester b as a yellow solid.
  • the aqueous phase was extracted with CH 2 Cl 2 (2 ⁇ 50 mL). The combined CH 2 Cl 2 were washed with sat. sodium thiosulfate (100 mL), dried (MgSO 4 ), and concentrated. The crude product was adsorbed on to Celite and purified by ISCO CombiFlash 120 g column (1-8% ethyl acetate-hexane) to afford 3.1 (66%) of chloro ester b as a white solid.
  • benzisoxazole amide a (740 mg, 3.3 mmol) afforded 390 mg (66%) of benzisoxazole ketone b as an off white solid.
  • difluoro ester a (9.2 g, 46.0 mmol) afforded 5.57 g (53%) of difluoro oxime b as a white solid.
  • difluoro ester a (10.8 g, 54 mmol) afforded 4.9 g (40%) of difluoro oxime b as a white solid.
  • benzisoxazole amide a (1.95 g, 8.7 mmol) afforded 448 mg (30%) of benzisoxazole ketone b as a brown oil.
  • Compound b may also be prepared according to the procedures described by Farooq et al. (WO 9614305).
  • benzisoxazole amide a (1.70 g, 7.6 mmol) afforded 192 mg (14%) of benzisoxazole ketone b as a white crystalline solid.
  • Lithium hydroxide (1.45 g, 34.5 mmol) was added to a solution of dihydroquinoline ester a (1.50 g, 6.91 mmol) in THF (40 mL), followed by water (10 mL). The mixture was stirred at RT for 16 h. It was concentrated in vacuo, diluted with EtOAc (100 mL) and 0.5 N HCl (100 mL). A white solid precipitated and was collected by filtration, washed with water. The EtOAc was separated, dried (MgSO 4 ), concentrated in vacuo to afford a white solid product. A combined yields of 1.41 g (100%) of dihydroquinoline acid b as a white solid, which was used with out further purification.
  • N,N-Diisopropylethylamine (1.37 g, 10.7 mmol) was added to a suspension of dihydroquinoline acid a (2.42 g, 11.9 mmol), amine (1.40 g, 14.3 mmol), and EDC (2.28 g, 11.9 mmol) in MeCN (80 mL), stirred at RT for 2 h.
  • dihydroquinoline amide a (2.17 g, 8.82 mmol)
  • CH 3 MgCl (8.82 mL of 3 M solution in THF, 26.5 mmol) afforded 766 mg (43%) of dihydroquinoline ketone b as a yellow solid.
  • Compound b may also be prepared according to the procedures described by Fujita et al. ( Chem. & Pharm. Bull. 2001, 49(7), 900-904 and Chem. & Pharm. Bull. 2001, 49(4), 407-412).
  • dihydroisoquinoline acid a (1.25 g, 6.2 mmol) prepared according to the procedures described by Deady et al. ( J. Heterocyclic Chem. 2001, 38, 1185) afforded 754 mg (50%) of dihydroisoquinoline amide b as a yellow gum.
  • dihydroisoquinoline aimde a (0.754 g, 3.06 mmol) afforded 510 mg (85%) of dihydroisoquinoline ketone b as a yellow solid.
  • Compound b may also be prepared according to the procedures desribed by Alvarez et al. ( Science of Synthesis 2005, 15, 839-906), Kimura et al. ( Chem. & Pharm. Bull. 1983, 31(4), 1277-82), Tomisawa et al. ( Chem. & Pharm. Bull. 1975, 23(3), 592-6) and Dyke et al. ( Tetrahedron 1973, 29(23), 3881-8).
  • bromo acid a (3.0 g, 11.9 mmol) afforded 2.67 g (77%) of bromo amide b as a white solid.
  • bromo amide a (1.0 g, 3.4 mmol) afforded 800 mg (94%) of bromo ketone b as an off white solid.
  • Trifluoromethane sulfonic anhydride (6.82 g, 24.2 mmol) was added drop wise onto to a mixture of ethyl-4-hydroxyquinoline carboxylate a (5.0 g, 23.0 mmol) and pyridine (1.95 mL, 24.2 mmol) in CH 2 Cl 2 (100 mL) at ice water bath temperature under N 2 . The mixture was stirred at RT overnight. It was diluted with CH 2 Cl 2 (100 mL), washed with 0.5 N NaOH (100 mL), dried (MgSO 4 ), concentrated in vacuo. The crude product was adsorbed on to Celite and purified by ISCO CombiFlash 80 g column (2-15% ethyl acetate-hexane) to afford 7.4 g (93%) of triflate b as a white solid.
  • ketone ester a (1.50 g, 6.17 mmol), KOH (640 mg, 11.35 mmol) in EtOH (30 mL) was stirred at RT overnight.
  • the reaction mixture was diluted with water (150 mL), extracted with EtOAc (100 mL).
  • the aqueous layer was then acidified with 1 N HCl, extracted with EtOAc (2 ⁇ 100 mL), dried (MgSO 4 ), concentrated in vacuo afforded 1.53 g (100%) of ketone acid b as a yellow solid.
  • Compound b may also be prepared according to the procedures described by Priestly et al. ( Bioorg. & Med. Chem. 1996, 4(7), 1135-1147).
  • amide a (3.29 g, 11.26 mmol) afforded 3.29 g (118%) of ketone b as a yellow solid.
  • Compound b may also be prepared accoridng to the procedures described by Sato et al. (JP 2002371078), Wong et al (WO 9846572), Leardini et al. ( J. Chem. Soc., Chem. Communications 1984, 20, 1320-1), Kaneko et al. ( Chem. & Pharm. Bull. 1982, 30(1), 74-85), Schwenk et al. ( J. Org. Chem. 1946, 11, 798-802) and Shivers et al ( J. Am. Chem. Soc. 1947, 69, 119-23).
  • amide a (1.88 g, 8.1 mmol) afforded 993 mg (66%) of ketone b as a light yellow solid.
  • Compound b may also be prepared accoridn to the procedures described by Wetzel et al. ( J. Med. Chem. 1973, 16(5), 528-32), Jones et al. ( J. Chem. Soc. [Section C]: Organic 1967, 19, 1808-13) and Ochia et al. ( Chem. & Pharm. Bull. 1963, 11, 137-8).
  • Boc-ester a (900 mg, 2.0 mmol) was dissolved in THF (20 mL) and MeOH (1 mL) at ice water bath temperature. NaBH 4 (300 mg, 8.0 mmol) was added and the mixture was stirred for 1 h then another 1 h at RT. Reaction was quenched with the addition of few drops of water, then diluted with more water (100 mL), extracted with EtOAc (2 ⁇ 100 mL), dried (MgSO 4 ), and concentrated in vacuo to afford 739 mg (90%) of alcohol b as a yellow foamy solid.
  • Boc-amine a (175 mg, 0.26 mmol) was treated with (1:1) TFA/CH 2 Cl 2 (8 mL), catalytic toluene at RT for 1 h. Solvent was removed in vacuo. The residue was purified by reverse-phase HPLC (C 18 , MeCN—H 2 O, 0.1% TFA) and lyophilized to afford 98 mg (49%, in 2 steps) of desired product b as a hygroscopic white solid.
  • Boc-ester a 200 mg, 0.30 mmol
  • LiOH 200 mg, 0.30 mmol
  • water 25 ⁇ L
  • MeOH 500 ⁇ L
  • ester a (780 mg), CH 2 Cl 2 (5 mL), and TFA (2 mL) was maintained at rt overnight. The solvents were removed under reduced pressure to afford quantitative yield acid b as a colorless oil which was used without further purification.
  • pivaloyl chloride (3.2 mL, 26 mmol) was added to a ⁇ 10° C. solution of acid a (3.72 g, 23.5 mmol), TEA (4.3 mL, 31 mmol) and THF (50 mL). The resulting white slurry was allowed to warm to ⁇ 5° C. over 20 min with vigorous stirring. The mixture was then cooled to ⁇ 78° C.
  • TrsylN 3 (6.9 g, 22.4 mmol) and THF (40 mL) was added via cannula over 5 min.
  • Acetic acid (5.3 mL, 90 mmol) was added and the mixture was immediately brought to 30° C. and held there for 1 h.
  • the reaction was quenched with brine (200 mL) and CH 2 Cl 2 (200 mL). The phases were separated and the aqeous phase was extraced with CH 2 Cl 2 (2 ⁇ 50 mL).
  • Diisopropyl zinc (3 ml of 1.0M solution in toluene, 2.5 mmol) was added to a mixture of chloride a (500 mg, 1.8 mmol), NiCl 2 DPPP (115 mg, 0.18 mmol), and THF (3 mL) The dark solution was then heated at 100° C. in a ⁇ W reactor for 15 min. The reaction was then quenched into saturated NH 4 Cl (50 mL), and extracted with EtOAc (3 ⁇ 20 mL).
  • Methyl magnesium chloride (12.3 mL of 3.0M in THF, 37 mmol) was added to 0° C. solution of amide a (2.84 g, 10.51 mmol) and THF (20 mL). The solution was allowed to come to rt, then maintained at that temp. for 4 h. The reaction was quenched into cold saturated NH 4 Cl (100 mL), extracted with EtOAc (3 ⁇ 50 mL).
  • Methyl magnesium chloride (7.3 mL of 3.0M in THF, 22 mmol) was added to 0° C. solution of amide a (1.77 g, 6.2 mmol) and THF (15 mL). The solution was allowed to come to rt, then maintained at that temp. for 4h. The reaction was quenched into cold saturated NH 4 Cl (100 mL), extracted with EtOAc (3 ⁇ 50 mL).
  • Trifluoromethane sulfonic anhydride (5.0 g, 17.7 mmol) was added drop wise to a mixture of 2-methyl-4-hydroxyquinoline a (2.56 g, 16.1 mmol) and pyridine (1.54 mL, 17.7 mmol) in CH 2 Cl 2 (25 mL) at ice water bath temperature under N 2 . The mixture was allowed to warm to 10° C.
  • Tetrahydropyranylglycine was purchased from NovaBiochem, or synthesized according to the literature: Ghosh, A. K.; Thompson, W. J.; holloway, M. K.; McKee, S. P.; Duong, T. T.; Lee, H. Y.; Munson, P. M.; Smith, A. M.; Wai, J. M; Darke, P. L.; Switzerlanday, J. A.; Emini, E. A.; Schleife, W. A.; Huff, J. R.; Anderson, P. S. J. Med. Chem, 1993, 36, 2300-2310.
  • Piperidinylglycine was synthesized according to the procedures described by Shieh et al. ( Tetrahedron: Asymmetry, 2001, 12, 2421-2425.
  • L-alanine methyl ester hydrochloride a (5 g, 35.8 mmol) and cyclopropanecarboxaldehyde b (2.67 ml, 35.8 mmol) were suspended in 50 ml THF w/1% AcOH. Addition of 5 ml of CH 3 OH made the cloudy solution turned to clear. NaCNBH 4 (2.25 g, 35.8 mmol) was added and the reaction mixture stirred overnight. The reaction was quenched by addition of 1N aq. NaOH, extracted by EtOAc twice, organic layers were dried over Na 2 SO 4 and concentrated to dryness.
  • the crude material was purified by chromatography using 30% EtOAc/hexane (stained by ninhydrin) to obtain the compound c (1 g, 18%).
  • the compound c (1 g, 6.37 mmol) and di-t-bocdicarbonate (2.1 g, 9.55 mmol) were diluted in THF (20 ml) and H 2 O (20 ml), NaHCO 3 (1.3 g, 15.9 mmol) was added.
  • the reaction mixture stirred overnight for completion.
  • THF was removed under reduced pressure, and the aqueous layer was extracted by EtOAc 3 times. Combined organic layers were washed by 1N NaOH, sat, NH 4 Cl followed by brine, the concentrated to dryness.
  • Phosphonate b (7.2 g, 21 mmol) was dissolved in THF (25 mL) at room temperature, and TMG (3.6 mL, 29 mmol, 1.3 equiv) was added dropwise. The mixture was stirred for 15 min at room temp.
  • Commercially available ketone a (6.7 g, 43 mmol) was dissolved in THF (25 mL) and added dropwise to the mixture of phosphonate and base. The reaction was stirred for 24 h at room temperature and quenched by adding approx 200 mL of 1 N HCl. Organic products were quickly extracted into 80% ethyl acetate-hexanes (400 mL total).
  • Ketal a (1.56 g, 4.73 mmol) was dissolved in 6 mL of THF. To this solution was added deionized water (15 mL), glacial acetic acid (6 mL), and dichloroacetic acid (1 mL). The mixture was stirred overnight at room temperature. Aqueous 1 N sodium hydroxide (approx. 100 mL) was added, and crude product was extracted into dichloromethane (approx. 200 mL).
  • Ester a (184 mg, 0.55 mmol) was dissolved in 2 mL of THF. Deionized water was added (1 mL), followed by lithium hydroxide monohydrate (42 mg, 1.0 mmol). The mixture was stirred at room temperature overnight, then acidified using aqueous 1 N HCl and extracted into dichloromethane. Drying (Na 2 SO 4 ), filtration and evaporation of the solvent yielded 175 mg (quantitative yield) of the carboxylic acid b.
  • the BOC-protected amine obtained from this coupling reaction was dissolved in dichloromethane (2 mL), deionized water (0.5 mL) and trifluoroacetic acid (1 mL) and allowed to stir for 3 h at room temperature. Organic solvents were removed under reduced pressure, the aqueous layer was made basic using a small amount of 1 N NaOH, and product was extracted into dichloromethane. Removal of organic solvent yielded 110 mg (0.25 mmol, 45% amine #) of the free amine #.
  • Standard EDC coupling procedure was performed using amine b (110 mg, 0.25 mmol) L-BOC-N-methylalanine a (72 mg, 0.35 mmol) and EDC (67 mg, 0.35 mmol).
  • BOC-protected final product was purified by chromatography ISCO CombiFlash 12 g column with a solvent gradient of 5-55% ethyl acetate-dichloromethane over 15 min followed by 55% ethyl acetate-dichloromethane for 4 min.
  • BOC-deprotection was performed using 2:1 DCM:TFA with few drops of water.
  • Final product c 54 mg, 66%) was purified by reverse-phase HPLC C 18 column with a solvent gradient of 5-50% acetonitrile-water over 20 min.
  • the product BOC-protected amine b was dissolved in 5 mL of THF. The following solvents were then added sequentially: deionized water (15 mL), glacial acetic acid (30 mL), and dichloroacetic acid (3 mL). The mixture was stirred overnight at room temperature, and the reaction was quenched by slowly adding solid sodium carbonate with vigorous stirring until the release of gas was no longer visible. Crude product was extracted into 10% ethyl acetate-dichloromethane.
  • the product was adsorbed onto Celite by evaporation of the solvents, and purified by chromatography ISCO CombiFlash 120 g column with a solvent gradient of 0-36% ethyl acetate-hexanes over 20 min followed by flushing with 36% ethyl acetate-hexanes for 5 min to afford 2.86 g (10.0 mmol, 91%) of ketone b.
  • Standard EDC coupling was performed using amine b (46 mg, 0.15 mmol), carboxylic acid a, (42 mg, 0.15 mmol syn-diastereomer) and EDC (33 mg, 0.17 mmol).
  • BOC-protected final product was purified by chromatography ISCO CombiFlash stacker 2 ⁇ 4 g column with a solvent gradient of 0-28% ethyl acetate-dichloromethane over 15 min, followed by 28% ethyl acetate-dichloromethane for 3 min.
  • Standard BOC-deprotection was performed using 2:1 DCM:TFA with few drops of water.
  • the TFA salt was treated with base (aqueous 1 N NaOH) and extracted into dichloromethane.
  • Standard EDC coupling was performed using amine b (110 mg, 0.38 mmol), carboxylic acid a, (105 mg, 0.38 mmol) and EDC (86 mg, 0.45 mmol).
  • BOC-protected final product was purified by chromatography ISCO CombiFlash stacker 2 ⁇ 4 g column with a solvent gradient of 0-28% ethyl acetate-dichloromethane over 15 min, followed by 28% ethyl acetate-dichloromethane for 3 min.
  • Standard BOC-deprotection was performed using 2:1 DCM:TFA with few drops of water.
  • the TFA salt was treated with base (aqueous 1 N NaOH) and extracted into dichloromethane.
  • Ketone a (1.45 g, 5.3 mmol), was dissolved in dry diethyl ether (20 mL) and cooled to ⁇ 78° C.
  • Methyllithium (1.6 M in Et 2 O, 9.5 mL, 15 mmol) was added dropwise to the reaction mixture and stirred vigorously at the reduced temperature for 1 h. The reaction was quenched by pouring the cold mixture into saturated aqueous ammonium chloride and extracting the organics into dichloromethane.
  • the organic layer was dried (Na 2 SO 4 ), filtered, adsorbed onto Celite and purified by chromatography ISCO CombiFlash 120 g column, 0-50% ethyl acetate-hexanes over 25 min, followed by flushing 50% ethyl acetate-hexanes for 3 min, and 90% ethyl acetate-hexanes for 3 min.
  • This purification afforded 344 mg (1.1 mmol, 42%) of the syn-diastereomer c and 299 mg (0.99 mmol, 37%) of the anti-diastereomer b.
  • Standard EDC coupling was performed using amine b (62 mg, 0.21 mmol), the carboxylic acid a, (32 mg, 0.11 mmol) and EDC (21 mg, 0.11 mmol).
  • BOC-protected final product was purified by chromatography ISCO CombiFlash 12 g column with a solvent gradient of 0-40% ethyl acetate-dichloromethane over 22 min, followed by 67% ethyl acetate-dichloromethane for 3 min.
  • Standard BOC-deprotection was performed using 2:1 DCM:TFA with few drops of water.
  • the TFA salt was treated with base (aqueous 1 N NaOH) and extracted into ethyl acetate with 10% dichloromethane.
  • Standard EDC coupling was performed using amine b (82 mg, 0.27 mmol), the carboxylic acid a, (95 mg, 0.33 mmol) and EDC (65 mg, 0.34 mmol).
  • BOC-protected final product was purified by chromatography ISCO CombiFlash 12 g column with a solvent gradient of 0-40% ethyl acetate-dichloromethane over 22 min, followed by 67% ethyl acetate-dichloromethane for 3 min.
  • Standard BOC-deprotection was performed using 2:1 DCM:TFA with few drops of water.
  • the TFA salt was treated with base (aqueous 1 N NaOH) and extracted into ethyl acetate with 10% dichloromethane.
  • alkene a (774 mg 2.19 mmol), dry methanol (40 mL), and [(S,S)-Me-BPE-Rh(COD)] + OTf ⁇ (500 mg, 0.8 mmol) were mixed in a Parr shaker flask purged with nitrogen. Parr shaker was evacuated and subsequently charged to 60 psi of hydrogen gas and shaken vigorously overnight. Methanol was removed under reduced pressure, and crude product was filtered through a small plug of silica gel using ethyl acetate. Evaporation of the solvent yielded 730 mg (2.0 mmol, 94%) of product b with >98% yield.
  • Ester a (508 mg, 1.56 mmol) was dissolved in 8 mL of THF. Deionized water (4 mL) was added, followed by LiOH.H 2 O (120 mg, 2.8 mmol). The mixture was stirred at room temperature overnight, acidified using aqueous 1 N HCl and extracted into ethyl acetate. Drying (Na 2 SO 4 ), filtration and evaporation of the solvent yielded 372 mg (1.21 mmol, 78% yield) of the carboxylic acid b, clean enough to use in the next step without purification.
  • Standard EDC coupling was performed using amine b (100 mg, 0.2 mmol), the carboxylic acid a, (58 mg, 0.29 mmol) and EDC (56 mg, 0.29 mmol).
  • BOC-protected final product was purified by chromatography ISCO CombiFlash 12 g column with a solvent gradient of 0-65% ethyl acetate-dichloromethane over 15 min.
  • Standard BOC-deprotection was performed using 2:1 DCM:TFA with few drops of water.
  • Final product c was purified by reverse-phase HPLC C 18 column with a solvent gradient of 5-50% acetonitrile-water over 18 min. Yield of product c was 132 mg.
  • Standard EDC coupling was performed using amine b (130 mg, 0.3 mmol), the carboxylic acid a, (60 mg, 0.28 mmol) and EDC (60 mg, 0.3 mmol).
  • BOC-protected final product was purified by chromatography ISCO CombiFlash 12 g column with a solvent gradient of 0-65% ethyl acetate-dichloromethane over 15 min.
  • Standard BOC-deprotection was performed using 2:1 DCM:TFA with few drops of water.
  • Final product c was purified by reverse-phase HPLC C 18 column with a solvent gradient of 5-50% acetonitrile-water over 18 min. Yield of product c was 78 mg.
  • Impurities were extracted into 90% ethyl acetate-hexanes, the aqueous layer was then acidified by adding solid citric acid until the pH reached 2-3. The product was extracted into 90% ethyl acetate-hexanes. This organic layer was dried (Na 2 SO 4 ) and filtered. Removal of the solvents under reduced pressure afforded a quantitative yield of the product b.
  • Standard EDC coupling was performed using amine b (70 mg, 0.16 mmol), the carboxylic acid a, (49 mg, 0.24 mmol) and EDC (46 mg, 0.24 mmol).
  • BOC-protected final product was purified by chromatography ISCO CombiFlash 12 g column with a solvent gradient of 0-55% ethyl acetate-dichloromethane over 15 min.
  • Standard BOC-deprotection was performed using 2:1 DCM:TFA with few drops of water.
  • Final product c was purified by reverse-phase HPLC C 18 column with a solvent gradient of 5-50% acetonitrile-water over 18 min. Yield of of product c was 82 mg.
  • Standard EDC coupling was performed using amine b (64 mg, 0.14 mmol), the carboxylic acid a, (41 mg, 0.2 mmol) and EDC (38 mg, 0.2 mmol).
  • BOC-protected final product was purified by chromatography ISCO CombiFlash 12 g column with a solvent gradient of 0-55% ethyl acetate-dichloromethane over 10 min, followed by a steady flow of 55% ethyl acetate-dichloromethane for 3 min.
  • Standard BOC-deprotection was performed using 2:1 DCM:TFA+few drops of water.
  • Final product c was purified by reverse-phase HPLC C 18 column with a solvent gradient of 5-50% acetonitrile-water over 18 min. Yield of product c was 70.2 mg.
  • Standard EDC coupling was performed using amine hydrochloride b (250 mg, 0.67 mmol), the carboxylic acid a, (187 mg, 0.81 mmol), DIPEA (0.35 mL, 2.0 mmol) and EDC (157 mg, 0.81 mmol). Reaction was stirred at room temperature for 48 h. BOC-protected final product was purified by chromatography ISCO CombiFlash 12 g column with a solvent gradient of 0-25% ethyl acetate-hexanes over 10 min, followed by a steady flow of 26% ethyl acetate-hexanes for 3 min. Standard BOC-deprotection was performed using HCl in dioxane (4.0 M, 3.0 mL).
  • Standard EDC coupling was performed using amine hydrochloride # (250 mg, 0.67 mmol), the carboxylic acid a, (187 mg, 0.81 mmol), DIPEA (0.350 mL, 2.0 mmol) and EDC (157 mg, 0.81 mmol). Reaction was stirred at room temperature for 3 h. BOC-protected final product was purified by chromatography ISCO CombiFlash 12 g column with a solvent gradient of 0-25% ethyl acetate-hexanes over 10 min, followed by a steady flow of 26% ethyl acetate-hexanes for 3 min. Standard BOC-deprotection was performed using HCl in dioxane (4.0 M, 3.0 mL).
  • EDC coupling was performed using amine hydrochloride b (230 mg, 0.61 mmol), the carboxylic acid a, (165 mg, 0.75 mmol), DIPEA (0.350 mL, 2.0 mmol) and EDC (157 mg, 0.81 mmol). Reaction was stirred at room temperature for 3 h, LC/MS indicated only half complete. More carboxylic acid (160 mg) and EDC (150 mg) was added to the reaction, and the mixture was stirred overnight at room temperature.
  • BOC-protected final product was purified by chromatography ISCO CombiFlash 40 g column with a solvent gradient of 0-55% ethyl acetate-hexanes over 17 min, followed by a steady flow of 56% ethyl acetate-hexanes for 5 min. Standard BOC-deprotection was performed using 2:1 DCM:TFA+few drops of water. Coupling of the product primary amine c (199 mg, 0.5 mmol) to L-BOC-N-methylalanine (140 mg, 0.7 mmol) was performed with EDC (135 mg, 0.7 mmol) and dichloromethane (3 mL).
  • BOC-protected final product was purified by chromatography ISCO CombiFlash 12 g column with a solvent gradient of 0-40% ethyl acetate-dichloromethane over 15 min followed by 40% ethyl acetate-dichloromethane for 3 min. Standard BOC-deprotection was performed using 2:1 DCM:TFA with few drops of water. Final product was purified by reverse-phase HPLC C 18 column with a solvent gradient of 5-50% acetonitrile-water over 20 min. Yield of final product was 178 mg.
  • Methyl ketone a (480 mg, 3.0 mmol), synthesized according to the general procedure of Miki [Miki, Y.; Nakamura, N.; Hachiken, H.; Takemura, S. J. Heterocyclic Chem., 1989, 26, 1739-1745], was suspended in 33% HBr in acetic acid (6 mL). Elemental bromine was added in six portions (6 ⁇ 0.025 mL, 0.15 mL total, 3.0 mmol) with vigorous stirring at room temperature. The reaction appeared to have a light color after 10 min of stirring, when diethyl ether was added (10 mL). Stirring at room temperature was continued for 30 min.
  • the mixture was filtered through a frit, and the solids left behind were rinsed with 20 mL of ether, transferred to a vial, and dried under high vacuum.
  • the solid afforded (840 mg) was a mixture of desired product b and the HBr salt of the starting material, used without further purification in the thiazole-forming step.
  • the mixture was then diluted with deionized water, poured into ethyl acetate in a separatory funnel, and made acidic by the addition of 6 N HCl. After extracting into ethyl acetate, the organic layer was washed with deionized water, followed by brine. The organic layer was dried (Na 2 SO 4 ), filtered and concentrated under reduced pressure to afford clean FMOC-protected amino acid c (1.05 g, 3.19 mmol, 32%) to be used without further purification.
  • reaction mixture was then allowed to cool to room temperature, and washed with saturated aqueous sodium bicarbonate (2 ⁇ 30 mL). The organic layer was dried (Na 2 SO 4 ), filtered, and concentrated under reduced pressure to afford 910 mg (2.7 mmol) of oxazolidinone b.
  • the oxazolidinone (337 mg, 0.99 mmol) was dissolved in dichloromethane (20 mL). To this solution was added anhydrous aluminum trichloride (260 mg, 2.0 mmol), followed by triethylsilane (0.32 mL, 2.0 mmol). The reaction mixture was stirred for 5 h at room temperature and then quenched with 20 mL of 1 N aqueous HCl.
  • the product carboxylic acid was extracted into 25% ethyl acetate-dichloromethane and washed with 1 N aqueous HCl (20 mL) followed by brine. The organic layer was dried (Na 2 SO 4 ) and filtered. Celite was added, and the solvent was removed under reduced pressure. The crude product adsorbed onto Celite was purified by chromatography ISCO CombiFlash 40 g column, 1-55% ethyl acetate-dichloromethane over 25 min, to afford 272 mg (0.79 mmol, 25% yield from FMOC-primary amine) of the FMOC protected N-methyl amino acid c.
  • Standard EDC coupling was performed using amine # (140 mg, 0.4 mmol), the crude carboxylic acid a, (176 mg, 0.4 mmol) and EDC (80 mg, 0.4 mmol).
  • BOC-protected final product was purified by chromatography ISCO CombiFlash 40 g column with a solvent gradient of 1-40% ethyl acetate-dichloromethane over 20 min. The desired BOC-protected product was split into two portions for removing the FMOC group. The first portion (50 mg, 0.065 mmol) was dissolved in dichloromethane (1.0 mL), treated with piperidine (0.10 mL, 1.0 mmol), and allowed to stir at room temperature for 2 h.
  • MLXBIR3SG a chimeric BIR domain referred to as MLXBIR3SG in which 11 of 110 residues correspond to those found in XIAP-BIR3, while the remainder correspond to ML-IAP-BIR.
  • the chimeric protein MLXBIR3SG was shown to bind and inhibit caspase-9 significantly better than either of the native BIR domains, but bound Smac-based peptides and mature Smac with affinities similar to those of native ML-IAP-BIR.
  • the improved caspase-9 inhibition of the chimeric BIR domain MLXBIR3SG has been correlated with increased inhibition of doxorubicin-induced apoptosis when transfected into MCF7 cells.
  • MLXBIR3SG sequence MGSSHHHHHHSSGLVPRGSHMLETEEEEEEGAGATL (SEQ ID NO.:1) SRGPAFPGMGSEELRLASFYDWPLTAEVPPELLAAA GFFHTGHQDKVRCFFCYGGLQSWKRGDDPWTEHAKW FPGCQFLLRSKGQEYINNIHLTHSL TR-FRET Peptide Binding Assay
  • this cocktail can be made using europium-labeled anti-His (Perkin Elmer) and streptavidin-allophycocyanin (Perkin Elmer) at concentrations of 6.5 nM and 25nM, respectively).
  • the reagent cocktail was incubated at room temperature for 30 minutes. After incubation, the cocktail was added to 1:3 serial dilutions of an antagonist compound (starting concentration of 50 ⁇ M) in 384-well black FIA plates (Greiner Bio-One, Inc.).
  • Samples for fluorescence polarization affinity measurements were prepared by addition of 1:2 serial dilutions starting at a final concentration of 5 ⁇ M of MLXBIR3SG in polarization buffer (50 mM Tris [pH 7.2], 120 mM NaCl, 1% bovine globulins 5 mM DTF and 0.05% octylglucoside) to 5-carboxyflourescein-conjugated AVPdi-Phe-NH 2 (AVP-diPhe-FAM) at 5 nM final concentration.
  • polarization buffer 50 mM Tris [pH 7.2], 120 mM NaCl, 1% bovine globulins 5 mM DTF and 0.05% octylglucoside

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