WO2003093241A1 - Process for the preparation of 7-substituted-3-quinoline and 3-quinol-4-one carbonitriles - Google Patents

Process for the preparation of 7-substituted-3-quinoline and 3-quinol-4-one carbonitriles Download PDF

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Publication number
WO2003093241A1
WO2003093241A1 PCT/US2003/013149 US0313149W WO03093241A1 WO 2003093241 A1 WO2003093241 A1 WO 2003093241A1 US 0313149 W US0313149 W US 0313149W WO 03093241 A1 WO03093241 A1 WO 03093241A1
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Prior art keywords
methoxy
amino
quinolinecarbonitrile
methoxyphenyl
dichloro
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PCT/US2003/013149
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French (fr)
Inventor
Diane Harris Boschelli
Yanong Daniel Wang
Steven Lawrence Johnson
Dan Maarten Berger
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Wyeth Holdings Corporation
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Priority to CA002483529A priority Critical patent/CA2483529A1/en
Priority to MXPA04010664A priority patent/MXPA04010664A/en
Application filed by Wyeth Holdings Corporation filed Critical Wyeth Holdings Corporation
Priority to KR10-2004-7017459A priority patent/KR20040106420A/en
Priority to NZ536141A priority patent/NZ536141A/en
Priority to UA20041109740A priority patent/UA77799C2/en
Priority to AT03724293T priority patent/ATE302191T1/en
Priority to BR0309712-9A priority patent/BR0309712A/en
Priority to EP03724293A priority patent/EP1499594B1/en
Priority to SI200330083T priority patent/SI1499594T1/en
Priority to IL16485103A priority patent/IL164851A0/en
Priority to JP2004501380A priority patent/JP2005529907A/en
Priority to DE60301350T priority patent/DE60301350T2/en
Priority to AU2003231162A priority patent/AU2003231162B2/en
Publication of WO2003093241A1 publication Critical patent/WO2003093241A1/en
Priority to NO20044533A priority patent/NO20044533L/en
Priority to HK05103003A priority patent/HK1070358A1/en

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing three or more hetero rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • 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
    • C07D215/00—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
    • C07D215/02—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
    • C07D215/16—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms 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
    • C07D215/38—Nitrogen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D215/00—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
    • C07D215/02—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
    • C07D215/16—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms 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
    • C07D215/48—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
    • C07D215/54—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen attached in position 3
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D215/00—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
    • C07D215/02—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
    • C07D215/16—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms 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
    • C07D215/48—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
    • C07D215/54—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen attached in position 3
    • C07D215/56—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen attached in position 3 with oxygen atoms in position 4
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/12—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
    • C07D409/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings
    • C07D409/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links

Definitions

  • This invention relates to a process for the preparation of 7-substituted-3- quinolinecarbonitriles and intermediates useful in a process to prepare 7-substituted- 3-quinolinecarbonitriles and pharmaceutically acceptable salts thereof.
  • Protein kinases are enzymes that catalyze the transfer of a phosphate group
  • the compounds disclosed in WO9843960 are 3- quinolinecarbonitrile derivatives which are inhibitors of protein tyrosine kinases and useful in the treatment of cancer.
  • the aforementioned compounds have been 25 prepared by processes which are effective for the initial preparation of targeted compounds.
  • a new and effective alternate source of important intermediates useful in the preparation of 3-quinolinecarbontrile derivatives is desired.
  • an alternate process to prepare 7-substituted-3- quinolinecarbonitriles is desired.
  • the present invention provides a process for the preparation of 7-substituted- 3-quinolinecarbonitriles of Formula (I)
  • X is selected from -O-, -S-, -NH-, and -NR 2' -;
  • W is H or -OR 3 ;
  • q is an integer of 0-5;
  • n is an integer of 0-2;
  • n is an integer of 2-5;
  • R 1 is an alkyl group of 1 to 6 carbon atoms, a cycloalkyl group of 3 to 10 carbon atoms, or an aryl of 6 to 12 carbon atoms, or heteroaryl ring, said aryl or heteroaryl ring is optionally fused to an additional aryl or heteroaryl ring, wherein heteroaryl is defined as a 5 or 6 membered aromatic ring moiety containing at least one and up to 4 heteroatoms selected from O, S, and N; said aryl or heteroaryl rings optionally fused may optionally be substituted with 1 to 4 substituents independently selected from the group consisting of -J, -NO 2 , -NH 2 , -OH, -SH, -CN, -N 3 , -COOH, -CONH 2 , -NHC(O)NH 2 , -C(O)H, -CF 3 , -OCF 3 , -R 4 , -OR 4 , -NHR
  • R 5 OC(O)NH 2 , -R 5 OC(O)NHR 4 and -R 5 OC(O)NR 4 R 4 , and NR 7 groups wherein Y is independently selected from -C(O)-, -C(O)O-, -OC(O)-, -C(O) ⁇ H-, -NHC(O)-, - NHSOa-, -SO 2 NH-, -C(OH)H-, -Q(C(R 8 ) 2 ) q -, -(C(R 8 ) 2 ) q -, -(C(R 8 ) 2 ) q Q-, -C ⁇ C-, cis- and trans -CH CH- and cycloalkyl of 3-10 carbon atoms;
  • Q is -O-, -S(O) m -, -NH-,or -NR 9 -;
  • J is halogen selected from fluoro, chloro, bromo and iodo
  • R 2 , R 2' and R 3 are each independently selected from an alkyl group of 1 to 6 carbon atoms, an alkenyl group of 2 to 6 carbon atoms or an alkynyl group of 2 to 6 carbon atoms, wherein each independent alkyl, alkenyl or alkynyl group is optionally substituted with -NO 2 , cyano, or -QR 4 , or R 2 , R 2' and R 3 are each independently selected from -(C(R 8 ) 2 ) q -aryl, -(C(R 8 ) 2 ) q -heteroaryl, -(C(R 8 ) 2 ) q - heterocyclyl, -(C(R 8 ) 2 ) n -Q-(C(R 8 ) 2 ) q -aryl, -(C(R 8 ) 2 ) n -Q-(C(R 8 ) 2 ) q -aryl, -(
  • heterocyclyl group may optionally be substituted on carbon or nitrogen with a group selected from -R 4 , -(C(R 8 ) 2 ) q -aryl, -(C(R 8 ) 2 ) q -heteroaryl, -(C(R 8 ) 2 ) q - heterocyclyl, -(C(R 8 ) 2 ) q -SO 2 R 4 , or the heterocyclyl group may optionally be substituted on carbon by -(C(R 8 ) 2 ) q -QR 4 , or the heterocyclyl group may optionally be substituted on nitrogen by -(C(R 8 ) 2 ) q -QR 4 , or the heterocyclyl group may optionally be substituted on nitrogen by -(C(R 8 ) 2 ) q -QR 4 , or the heterocyclyl group may optionally be substituted on nitrogen by -(C(R 8 ) 2 ) q -
  • R 4 is a monovalent group independently selected from alkyl of 1 to 6 carbon atoms, alkenyl of 2 to 6 carbon atoms, and alkynyl of 2 to 6 carbon atoms;
  • R 5 is a divalent group independently selected from alkyl of 1 to 6 carbon atoms, alkenyl of 2 to 6 carbon atoms, and alkynyl of 2 to 6 carbon atoms;
  • R 6 is a divalent alkyl group of 2 to 6 carbon atoms
  • R 7 is a cycloalkyl ring of 3 to 10 carbon atoms optionally substituted with one or more alkyl groups of 1 to 6 carbon atoms or an aryl or heteroaryl ring, optionally fused to an additional aryl or heteroaryl ring, wherein said aryl or heteroaryl ring optionally fused, may optionally be substituted with 1 to 4 substituents selected from the group consisting of aryl, -CH 2 -aryl, -NH-aryl, -O-aryl, -S(O)m-aryl, -J, -NO 2 , -NH 2 , -OH, -SH, -CN, -N 3 , -COOH, -CONH 2 , -NHC(O)NH 2 , -C(0)H, -CF 3 , -OCF 3 , -R 4 , - OR 4 , -NHR 4 , -NR 4 R 4 , -S(O)
  • R 8 is independently -H or -R 4 ;
  • R 9 is a monovalent alkyl group of 1 to 6 carbon atoms.
  • step b) reacting a 7-fluoro-3-quinolinecarbonitrile of formula 1 of step a) with an amine of the formula R 1 NH 2 , e.g. in the presence of pyridine hydrochloride, to provide a 7- f luoro-4-(substituted amino)-3-quinolinecarbonitrile of formula 2
  • step b) reacting a 7-fluoro-4-(substituted amino)-3-quinolinecarbonitrile of formula 2 of step b) with a compound of the formula R 2 XH, where X is selected from -S-, -O-, -NH-, and -NR 2 - and where R 2' and R 2 are as defined above or R 2 and R 2 ' may optionally be taken together with the nitrogen to which each is attached to form a heterocyclic ring, and in the presence of a base, when X is -O- or -S-, to provide a 7-substituted-3-quinolinecarbonitrile of Formula (I)
  • This invention also relates to a process for the preparation of 7-substituted-3- quinolinecarbonitriles of Formula (I)
  • R 2 XH a compound of the formula R 2 XH, where X is selected from -S-, -O-, -NH-, and - NR 2' - and where R 2' and R 2 are as defined above or R 2 and R 2' may optionally be taken together with the nitrogen to which each is attached, to form a heterocyclic ring, and in the presence of a base, when X is -O- or -S-, to provide a 7-substituted- 3-quinolinecarbonitrile of Formula (I),
  • This invention further relates to a process for the preparation of 7-substituted-3- quinolinecarbonitriles of Formula (I)
  • R 2 XH a compound of the formula R 2 XH, where X is selected from -S-, -O-, -NH-, and - NR 2' - and where R 2 and R 2 are as defined above or R 2 and R 2 ' may optionally be taken together with the nitrogen to which each is attached to form a heterocyclic ring, and in the presence of a base, when X is -O- or -S-, to provide a 7-substituted-4- oxo-1 ,4-dihydro-3-quinolinecarbonitrile of Formula 3
  • step b) reacting a 7-substituted-4-oxo-1 ,4-dihydro-3-quinolinecarbonitrile of step a) with a halogenating reagent, e.g. of the formula PO(Z) 3 , to provide a 7-substituted-4-halo-3- quinolinecarbonitrile 4 where Z is Cl or Br
  • step b) reacting a 7-substituted-4-halo-3-quinolinecarbonitrile of step b) with an amine R 1 NH 2 , e.g., in the presence of pyridine hydrochloride, to afford a 7-substituted-3- quinolinecarbonitrile of Formula (I)
  • the invention further relates to a process for the preparation of 7-substituted- 4-0X0-1 ,4-dihydro-3-quinolinecarbonitrile of Formula 3
  • R 2 XH a compound of the formula R 2 XH, where X is selected from -S-, -O-, -NH-, and - NR 2 - and where R 2' and R 2 may optionally be taken together with the nitrogen to which each is attached, to form a heterocyclic ring, and in the presence of a base, when X is -O- or -S-, to provide a 7-substituted-4-oxo-1 ,4-dihydro-3- quinolinecarbonitrile of Formula 3.
  • Reaction of 7-fluoro-3-quinolinecarbonitrile 1 with an amine R 1 NH 2 l a wherein R 1 is as hereinbefore defined may be carried out in a solvent such as 2- ethoxyethanol in the presence of a catalytic or equivalent amount of pyridine hydrochloride results in the formation of intermediate 7-fluoro-4-(substituted amino)- 3-quinolinecarbonitriles 2 where W is hereinbefore defined.
  • amine R 1 NH 2 l a is a substituted aniline where R 1 is substituted aryl.
  • Displacement of the 7-fluoro group of 7-fluoro-4-(substituted amino)-3-quinolinecarbonitriles_2 with an alkoxide or thioalkoxide anion results in the preparation of 7-substituted-3-quinolinecarbonitriles of Formula (I).
  • This reaction can be performed using an excess of the alcohol R 2 OH or thiol R 2 SH as the solvent or an optional cosolvent such as N,N- dimethylformamide, dimethyl sulfoxide or N-methylpyrrolidone can be used.
  • the anion can be generated from the alcohol or thiol 2a where X is O or S by the use of a base. Suitable bases include sodium, sodium hydride, potassium and potassium hydride.
  • Preferred bases are sodium and sodium hydride.
  • Commercially available sodium salts of the alcohol or thiol 2a where X is O or S are used if available.
  • R 1 in the formula herein examples are 2,4-dichloro-5-methoxyphenyl; cyclopentyl; butyl; 3,4,5-trimethoxyphenyl; 3-chloro-4- (1 -methyl-1 H-imidazol-2- yl)sulfanyl]phenyl; 2,4-dichorophenyl; 2-chloro-5-methoxyphenyl; 5-methoxy-2- methylphenyl and 2,4-dimethylphenyl.
  • R 2 in the formulae herein are :2-butynyl; 3-dimethylamino-2,2- dimethylpropyl; 3-(1 ,1-dioxido-4-thiomorpholinyl)propyl; 2-[2-(1- piperazinyl)ethoxy]ethyl; 2-thienylmethyl;benzyl; ethyl; phenyl; 2- methoxyethyl;pyridin-4-yl; 2-(1-methylpiperidin-4-yl)ethyl; 2-(1-methyl-3- piperidinyl)methyl; 2-(1-methyl-4-piperidinyl)methyl;2-(2-methoxy)ethyl;3-
  • a preferred compound of Formula (I) prepared by the process of the present invention is selected from the group consisting of:
  • the anion may be generated from the alcohol or thiol 2a where X is O or S respectively by the use of a base.
  • Suitable bases include sodium, sodium hydride, potassium and potassium hydride.
  • Preferred bases are sodium and sodium hydride.
  • Commercially available sodium salts of the alcohol or thiol 2a where X is O or S are used if available.
  • a halogenating reagent PO(Z) 3 wherein Z is a chloro or bromo group which include but not limited to phosphorous oxychloride, phosphorous oxybromide either neat or optionally in the presence of a cosolvent which include but not limited to dichloromethane affords 7-substituted-4-halo-3-quinolinecarbonitriles 4 which are further reacted with an amine l a wherein R is as hereinbefore defined in a solvent such as 2-ethoxyethanol in the presence of a catalytic or equivalent amount of pyridine hydrochloride results in the formation of 7-substituted-3- quinolinecarbonitriles of Formula (I).
  • amine R 1 NH 2 l a is a substituted aniline where R 1 is substituted aryl.
  • a preferred compound of formula (I) prepared by the process of the present invention is:
  • a preferred compound of formula 3 prepared by the process of the present invention is selected from the group consisting of:
  • R 3' includes but is not limited to groups including benzyl and isopropyl which may be removed to provide the 6-hydroxy derivative 6.
  • R 3 is a benzyl protecting group
  • the desired hydroxy group can be obtained by treatment with trifluoroacetic acid in the presence of thioanisole.
  • R 3 is an isopropyl protecting group
  • the desired 6-hydroxy derivative 6 may be obtained by treatment with aluminum trichloride.
  • Additional intermediates may be prepared as shown in Scheme 4 where 4-halo-3- quinolinecarbonitriles 8 with R 2 and R 3' as hereinbefore defined are deprotected to afford 6-hydroxyquinolines 9 using conditions as defined for deprotection in Scheme 3.
  • Further reaction of 6-hydroxy derivatives 9 with an alcohol R 3 OH 6a in the presence of triphenyl phosphine (Ph 3 P) where Ph is phenyl, and diethylazodicarboxylate (DEAD), in a solvent such as tetrahydrofuran affords 4-halo- 3-quinolinecarbonitriles 10 which may be further reacted with an amine R NH 2 l a to afford 7-substituted-3-quinolinecarbonitriles 11.
  • amine R 1 NH 2 la is a substituted aniline where R 1 is substituted aryl.
  • R 3' protecting group
  • Anilines .12 may be treated with ethyl (ethoxymethylene)cyanoacetate either neat or optionally in the presence of a cosolvent such as toluene, at temperatures ranging from about 60 to about 120°C followed by subsequent thermal cyclization, preferably in a eutectic solvent system which includes a 3: 1 mixture of diphenyl ether (Ph-O-Ph) and biphenyl(Ph-Ph) at a temperature range of about 240° to about 260°, affords 7-fluoro-4-oxo-1 ,4-dihydro-3- quinolinecarbonitriles of Formula (II).
  • a cosolvent such as toluene
  • aniline 12 is reacted with diethyl (ethoxymethylene)malonate either neat or optionally in the presence of a cosolvent toluene, at temperatures ranging from about 60 to about 120°C.
  • a cosolvent toluene e.g., 1,3-butane
  • Subsequent thermal cyclization, preferably in a eutectic solvent system which includes 3: 1 mixture of diphenyl ether and biphenyl at elevated temperature, at a temperature range of about 240° to about 260°C provides ester 13. Hydrolysis of the ester 13 under preferably basic conditions, such as sodium hydroxide in an alcoholic solvent such as ethanol, at reflux temperatures results in carboxylic acid 14.
  • Conversion of carboxylic acid 14 to primary amide 15 may be accomplished by treatment with an activating agent which includes N,N-carbonyl diimidazole(CDI) or oxalyl chloride followed by the addition of either ammonia gas or preferably an aqueous solution of ammonium hydroxide.
  • an activating agent which includes N,N-carbonyl diimidazole(CDI) or oxalyl chloride followed by the addition of either ammonia gas or preferably an aqueous solution of ammonium hydroxide.
  • a reagent such as cyanuric chloride in a solvent such as N,N-dimethylformamide provides 7-fluoro-4-oxo-1 ,4- dihydro-3-quinolinecarbonitriles of Formula (II).
  • the compounds of this invention are prepared from: (a) commercially available starting materials (b) known starting materials which can be prepared as described in literature procedures or (c) new intermediates described in the schemes and experimental procedures herein.
  • Reactions are performed in a solvent appropriate to the reagents and materials employed and suitable for the transformation being effected. It is understood by those skilled in the art of organic synthesis that the various functionalities present on the molecule must be consistent with the chemical transformations proposed. This may necessitate judgement as to the order of synthetic steps, protecting groups, if required, and deprotection conditions. Substituents on the starting materials may be incompatible with some of the reaction conditions. Such restrictions to the substituents which are compatible with the reaction conditions will be apparent to one skilled in the art. Reactions are run under inert atmospheres where appropriate.
  • the pharmaceutically acceptable salts are those derived from such organic and inorganic acids as: acetic, lactic, citric, tartaric, succinic, maleic, malonic, gluconic, hydrochloric, hydrobromic, phosphoric, nitric, sulfuric, methanesulfonic and similarly known acceptable acids.
  • Alkyl as used herein means a branched or straight chain radical having from 1 to 6 carbon atoms optionally substituted.
  • Alkenyl as used herein means a branched or straight chain radical having 2 to 6 carbon atoms optionally substituted. The chain having at least one double bond.
  • Alkynyl as used herein means a branched or straight chain radical having from 2 to 6 carbon atoms optionally substituted. The chain having at least one triple bond.
  • Alkoxy as used herein means an alkyl-O- group in which the alkyl group is as previously described.
  • exemplary alkoxy groups include but are not limited to methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, and t-butoxy.
  • Cycloalkyl as used herein means a saturated ring system having from 3 to 10 carbon atoms. Preferred is 3 or 7 carbon atoms.
  • Exemplary cycloalkyl rings include but are not limited to cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and the like.
  • Aryl as used herein means a mono or bicyclic aromatic ring having from 6 to 12 carbon atoms.
  • Monocyclic rings preferably have 6 members and bicyclic rings preferably have 8, 9, 10 or 12 membered ring structures.
  • Exemplary aryl groups include phenyl, alpha-naphthyl, beta-naphthyl, indene, and the like independently substituted with one or more substituents and more preferably with 1 to 4 substituents.
  • Heteroaryl denotes an unsubstituted or optionally substituted monocyclic 5 or 6 membered ring, which contains 1 to 4, or particularly 1 or 2 heteroatoms which may be the same or different. Nitrogen, oxygen and sulfur are the preferred heteroatoms, provided that the heteroaryl does not contain O-O, S-S or S-O bonds.
  • Specific examples include thiophene, furan, pyrrole, pyrazole, imidazole, 1 ,2,3-triazole, 1 ,2,4- triazole, tetrazole, thiazole, oxazole, isothiazole, isoxazole, 1 ,3,4-oxadiazole, 1 ,2,4- oxadiazole, 1 ,3,4-thiadiazole, pyridine, pyrimidine, pyrazine, pyridazine and 1 ,3,5- triazine.
  • the heteroaryl ring may be oxidized when a heteroatom is a nitrogen atom to provide the corresponding N-oxide, including pyridine -N-oxide or the heterocyclic ring may contain a carbonyl group on one of the carbon atoms, such as 1 ,3,4- oxadiazol-2-one.
  • Bicyclic heteroaryl refers to saturated or partially unsaturated bicyclic fused rings having 8 to 20 ring atoms containing 1 to 4 heteroatoms which may be the same or different independently selected from nitrogen, oxygen and sulfur optionally substituted with 1 to 3 independently selected substituents which may be the same or different provided that the bicyclic heteroaryl does not contain O-O, S-S or S-O bonds.
  • indole 2,3-dihydroindole, 2-indazole, isoindazole, quinoline, isoquinoline, tetrahydroquinoline, benzofuran, benzothiophene, benzimidazole, benzotriazole, benzothiazole, benzoxazole, benzisoxazole, 1 ,2- benzopyran, cinnoline, phthalazine, quinazoline, 1 ,8-naphthyridine, pyrido[3,2- b]pyridine, pyrido[3,4-b]pyridine, pyrido[4,3-b]pyridine, pyrido[2,3-d]pyrimidine, purine, and pteridine and the like.
  • Either or both rings of the bicyclic ring system may be partially saturated, or fully saturated, and the bicyclic group may be oxidized on a nitrogen atom to provide the corresponding N-oxide, such as quinoline -N-oxide, or the bicyclic ring system may contain a carbonyl group on one of the carbon atoms, such as 2-indanone.
  • Heterocyclyl, heterocyclyl group or heterocyclic ring means a saturated or partially unsaturated monocyclic radical containing preferably 3 to 8 ring atoms, more preferably 3 to 7 ring atoms and most preferably 5 to 6 ring atoms selected from carbon, nitrogen, oxygen and sulfur with at least 1 and preferably 1 to 4, more preferably 1 to 2 nitrogen, oxygen or sulfur as ring atoms.
  • heterocyclyl ring may be oxidized on a tri-substituted nitrogen atom to provide the corresponding
  • N-oxide such as N-ethylpiperazine-N-oxide
  • the heterocyclyl ring may contain a carbonyl group on one of the carbon atoms, such as pyrrolidinone.
  • a mixture of 3-fluoro-4-methoxyaniline (3.00 g, 21.26 mmol) and diethyl ethoxymethylene malonate (4.59 g, 21.26 mmol) is heated at 110°C for 1 hour then cooled to room temperature. Hexane is added and the solids collected by filtration. This material is suspended in 45 mL of a 3 : 1 mixture of diphenyl ether : biphenyl and the mixture is heated at reflux for 2 hours to provide a brown solution. The reaction mixture is cooled to room temperature and hexane is added.
  • the resultant solid is collected by filtration washing with hexane to provide 2.62 g of ethyl 7-fluoro- 6-methoxy-4-oxo-1 ,4-dihydro-3-quinolinecarboxylate as a white solid, mp >300°C.
  • a mixture of 3-fluoro-4-methoxyaniline (15.31 g, 108 mmol) and ethyl (ethoxymethylene)cyanoacetate (18.36 g, 108 mmol) in toluene is heated at 100- 110°C for 4.5 hours then cooled to room temperature.
  • a 1 : 1 mixture of hexane and ethyl acetate is added and the mixture is cooled on an ice bath.
  • the solids are collected washing with hexane to provide a first crop of 26.10 g and a second crop of 1.24 g.
  • a 2.0 g portion of this material is added to 18 mL of a 3 : 1 mixture of diphenyl ether : biphenyl that is heated to reflux.
  • reaction mixture is concentrated in vacuo and purified by flash column chromatography eluting with a gradient of 1% ethyl acetate in hexane to 5% ethyl acetate in hexane provides 4-chloro-6-ethoxy-7-fluoro-3-quinolinecarbonitrile, mp 165-166°C.
  • Trituration of the residue with ethyl acetate and diethyl ether provides 512 mg of 7-fluoro-6-methoxy-4- [(3,4,5-trimethoxyphenyl)amino]-3-quinolinecarbonitrile, mp 215-217°C.
  • the crude product is purified by silica gel chromatography utilizing a gradient of methylene chloride/methanol (9:1 to 4:1) to yield 152 mg of 6-methoxy-7-(4- methyl-piperazin-1-yl)-4-oxo-1 ,4-dihydroquino!ine-3-carbonitriIe as a yellow solid, dec. > 235°C.
  • a mixture of sodium hydride (500 mg, 12.5 mmol) and 7-fluoro-4-hydroxyquinoline-3- carbonitrile (1.30 g, 6.9 mmol) in 2-methoxyethanol (30 mL) is heated at reflux overnight. Additional sodium hydride (250 mg, 6.25 mmol) is added and the reaction mixture is heated at reflux overnight. Additional sodium hydride (250 mg, 6.25 mmol) is added and the reaction mixture is heated at reflux for 8 hours. The reaction mixture is cooled to room temperature and partitioned between ethyl acetate and saturated sodium bicarbonate.
  • the basic layer is acidified with aqueous HCI and the resultant solid is collected by filtration to provide 1.05 g of 7-(2-methoxyethoxy)-4- oxo-1 ,4-dihydroquinoline-3-carbonitrile as a white solid, mp >250°C.
  • a reaction mixture of 0.3 g (1.01 mmol) of 6-methoxy-7-(4-methyl-piperazin-1-yl)-4- oxo-1 ,4-dihydroquinoline-3-carbonitrile in 5 mL of phosphorus oxychloride is heated at 105°C for 45 minutes. After cooling, the mixture is concentrated to dryness in vacuo to give a brown solid. To this is added 5 mL toluene, and the solution is concentrated to dryness again. Dropwise, an ice-cooled saturated aqueous sodium carbonate solution is added to the residue. This mixture is extracted with 5 X 25 mL of a 95:5 mixture of methylene chloride/methanol. The organic layer is dried over magnesium sulfate.
  • the magnesium sulfate is removed by filtration, and solvent is removed in vacuo to provide 0.255 g of 4-chloro-6-methoxy-7-(4-methylpiperazin-1- yl)-quinoline-3-carbonitrile as a yellow solid, mp 177-179°C.
  • the solids are collected by filtration and purified by flash column chromatography, eluting with a gradient of 3 : 7 ethyl acetate : hexane to 1 : 1 ethyl acetate: hexane, to provide 116 mg of 7-(2- butynyloxy)-4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-3- quinolinecarbonitrile, mp 193-197°C.
  • reaction volume is reduced by concentration in vacuo and then partitioned between ethyl acetate and water.
  • the aqueous layer is extracted with additional ethyl acetate and the organic layers are combined and washed with water.
  • the organic layer is dried over magnesium sulfate, filtered and concentrated in vacuo.
  • the residue is purified by flash column chromatography eluting with a gradient of 10% to 30% ethyl acetate in hexane to provide 154 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]- 7- ethylsulfanyl-6-methoxy-3-quinolinecarbonitrile, mp 212-214°C.
  • a mixture of sodium (118 mg, 5.11 mmol) and 2-methoxyethanol (5 mL) is heated at 120-130°C for 3 hours.
  • 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-fluoro-6- methoxy-3-quinolinecarbonitrile (500 mg, 1.28 mmol) is added and the reaction mixture is heated at 120-125°C for 1 hour.
  • the temperature of the reaction mixture is increased to 140-150°C and this temperature is maintained for 2.5 hours.
  • the reaction mixture is cooled to room temperature and diluted with ice cold aqueous sodium bicarbonate.
  • the solid is collected by filtration washing with water and hexane.
  • Trituration of the residue with ethyl acetate and diethyl ether provides 178 mg of 6-methoxy-7-[2-methoxyethoxy]- 4- [(3,4,5-trimethoxyphenyl)amino]-3-quinolinecarbonitrile, mp 188-190°C.
  • 6-methoxy-7-fluoro-4-[(3,4,5- tri-methoxyphenyl)amino]-3-quinolinecarbonitrile (230 mg, 0.60 mmol) and 1 - methylpiperidine-3-methanol (200 mg, 1.55 mmol) provides, after flash column chromatography eluting with a gradient of 3 : 1 ethyl acetate : methanol to 2% aqueous ammonium hydroxide in 3 : 1 ethyl acetate : methanol, 143 mg of 6- methoxy-7-[(1 -methylpiperidine-4-yl)methoxy]]-4-[(3,4,5-thmethoxyphenyl)amino]-3- quinolinecarbonitrile, mp softens at 65°C.
  • Example 20 and 273 mg (2.73 mmol) of N-methylpiperazine in 1 mL of 1 -methyl-2- pyrrolidinone was heated at 105°C for 16 hours. The solvents are removed in vacuo. A 10 mL portion of water is added to the residue, from which a tan solid precipitates out. The solid is filtered off and washed with water. After drying in vacuo, the solid is suspended in ethyl acetate and stirred for 1 hour.
  • a reaction mixture of 0.12 g (0.38 mmol) of 4-chloro-6-methoxy-7-(4-methylpiperazin- 1-yl)-quinoline-3-carbonitrile, 0.077 g (0.42 mmol) of 4-phenoxyaniline and 0.044 g (0.38 mmol) of pyridine hydrochloride in 2 ml of 2-ethoxyethanol is heated at 115°C for 45 minutes. After cooling, the mixture is filtered, washed with cold 2- ethoxyethanol, then ethyl acetate. After drying in vacuo, the solid is suspended in a saturated solution of sodium carbonate, stirred for 45 minutes and collected by filtration.
  • reaction product is washed with water and dried in vacuo, to provide 0.11 g of 6-methoxy-7-(4-methylpiperazin-1-yl)-4-(4-phenoxyphenylamino)-quinoline- 3-carbonitrile as a yellow solid, mp softens at 93 °C.
  • Example 36-40 are obtained analogously by the method of Example 17 and the corresponding alcohol.
  • Example 41 -52 are obtained analogously by the method of Example 16 and the corresponding alcohol.
  • Example 53 is obtained analogously by the method of Example 1 and the corresponding alcohol.

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Abstract

There is provided a process for the preparation of 7-substituted-3-quinolinecarbonitriles and intermediates useful in a process to prepare 7-substituted-3-quinolinecarbonitriles and pharmaceutically acceptable salts is described. Where 7-fluoro-4-oxo-1,4-dihydro-3-quinolinecarbonitrile is converted in three steps to 7-substituted-3-quinolinecarbonitriles which inhibit the action of certain protein kinases and are useful in the treatment of cancer.

Description

PROCESS FOR THE PREPARATION OF 7-SUBSTITUTED-3-QUINOLINE AND 3-QUINOL-4-ONE CARBONITRILES
5 BACKGROUND OF THE INVENTION
This invention relates to a process for the preparation of 7-substituted-3- quinolinecarbonitriles and intermediates useful in a process to prepare 7-substituted- 3-quinolinecarbonitriles and pharmaceutically acceptable salts thereof.
Protein kinases are enzymes that catalyze the transfer of a phosphate group
10 from ATP to an amino acid residue, such as tyrosine, serine, threonine, or histidine on a protein. Regulation of these protein kinases is essential for the control of a wide variety of cellular events including proliferation and migration. Specific protein kinases have been implicated in diverse conditions including cancer [Traxler, P. M.,
Exp. Opin. Ther. Patents, 8, 1599 (1998); Bridges, A. J., Emerging Drugs, 3, 279
15 (1998)], restenosis [Mattsson, E., Trends Cardiovas. Med. 5, 200 (1995); Shaw,
Trends Pharmacol. Sci. 16, 401 (1995)], atherosclerosis [Raines, E. W., Bioessays,
18, 271 (1996)], angiogenesis [Shawver, L. K., Drug Discovery Today, 2, 50 (1997);
Folkman, J., Nature Medicine, 1 , 27 (1995)] and osteoporosis [Boyce, J. Clin. Invest.,
90, 1622 (1992)] and stroke (Paul, R. et al, Nature Medicine, 7(2), 222(2001). An
20 effective preparation of compounds which are inhibitors of protein tyrosine kinases and are useful in the treatment of cancer is important.
The compounds disclosed in WO9843960 (US 6,002,008) are 3- quinolinecarbonitrile derivatives which are inhibitors of protein tyrosine kinases and useful in the treatment of cancer. The aforementioned compounds have been 25 prepared by processes which are effective for the initial preparation of targeted compounds. However, a new and effective alternate source of important intermediates useful in the preparation of 3-quinolinecarbontrile derivatives is desired. Additionally desired is an alternate process to prepare 7-substituted-3- quinolinecarbonitriles.
30 A further series of new 3-quinolinecarbonitriles which are also highly effective inhibitors of protein tyrosine kinases and useful in the treatment of cancer are disclosed in published application WO 00/18740. Suitable processes for the preparation of 3-quinolinecarbonitriles are described therein, however, there is still a need in the art for yet more suitable methods for the preparation of important intermediates and final products useful in the preparation of 3-quinolinecarbonitriles useful in the treatment of cancer.
Therefore, methods to prepare 7-substituted-3-quinolinecarbonitriles and intermediates to facilitate their preparation are of great value.
It is an object of this invention to provide an alternate process to prepare 7- substituted-3-quinolinecarbonitriles and intermediates useful in a process to prepare 7-substituted-3-quinolinecarbonitriles which are highly effective as inhibitors of protein kinases useful in the treatment of cancer.
It is an object of this invention to provide a novel process for the preparation of 7-substituted-3-quinolinecarbonitriles by displacement of the 7-fluoro group of 7- fluoro-4-(substituted amino)quinolinecarbonitriles.
It is a further object of this invention to provide a novel process for the preparation of 7-substituted-4-oxo-1 ,4-dihydro-3-quinolinecarbonitriles by displacement of the 7-fluoro group of 7-fluoro-4-oxo-1 ,4-dihydro-3- quinolinecarbonitriles.
BRIEF SUMMARY OF THE INVENTION
The present invention provides a process for the preparation of 7-substituted- 3-quinolinecarbonitriles of Formula (I)
Figure imgf000003_0001
(I)
wherein: X is selected from -O-, -S-, -NH-, and -NR2'-;
W is H or -OR3;
q is an integer of 0-5;
m is an integer of 0-2;
n is an integer of 2-5;
R1 is an alkyl group of 1 to 6 carbon atoms, a cycloalkyl group of 3 to 10 carbon atoms, or an aryl of 6 to 12 carbon atoms, or heteroaryl ring, said aryl or heteroaryl ring is optionally fused to an additional aryl or heteroaryl ring, wherein heteroaryl is defined as a 5 or 6 membered aromatic ring moiety containing at least one and up to 4 heteroatoms selected from O, S, and N; said aryl or heteroaryl rings optionally fused may optionally be substituted with 1 to 4 substituents independently selected from the group consisting of -J, -NO2, -NH2, -OH, -SH, -CN, -N3, -COOH, -CONH2, -NHC(O)NH2, -C(O)H, -CF3, -OCF3, -R4, -OR4, -NHR4, -NR4R4, -S(O)mR4, -NHSO2R4, -R5OH, -R5OR4, -R5NH2, -R5NHR4, -R5NR4R4, -R5SH, -R5S(O)mR4, -NHR6OH, -N(R4)R6OH, -N(R4)R6OR4, -NHR6NH2, -NHR6NHR4, -NHR6NR4R4, -N(R4)R6NH2, -N(R4)R6NHR4, -N(R )R6NHR4R4,- OR6OH, -OR6OR4, -OR6NH2, -OR6NHR4, - OR6NR4R4, -OC(O)R4, -NHC(O)R4, -NHC(O)NHR4, -OR5C(O)R4, -NHR5C(O)R4, - C(O)R4, -C(O)OR4, -C(O)NHR4, -C(O)NR4R4, -R5C(O)H, -R5C(O)R4, -R5C(O)OH, - R5C(O)OR4, -R5C(O)NH2, -R5C(O)NHR4, -R5C(O)NR4R4, -R5OC(O)R4,
R5OC(O)NH2, -R5OC(O)NHR4 and -R5OC(O)NR4R4, and NR7 groups wherein Y is independently selected from -C(O)-, -C(O)O-, -OC(O)-, -C(O)ΝH-, -NHC(O)-, - NHSOa-, -SO2NH-, -C(OH)H-, -Q(C(R8)2)q-, -(C(R8)2)q-, -(C(R8)2)qQ-, -C≡C-, cis- and trans -CH=CH- and cycloalkyl of 3-10 carbon atoms;
Q is -O-, -S(O)m-, -NH-,or -NR9-;
J is halogen selected from fluoro, chloro, bromo and iodo;
R2, R2' and R3 are each independently selected from an alkyl group of 1 to 6 carbon atoms, an alkenyl group of 2 to 6 carbon atoms or an alkynyl group of 2 to 6 carbon atoms, wherein each independent alkyl, alkenyl or alkynyl group is optionally substituted with -NO2, cyano, or -QR4, or R2, R2' and R3 are each independently selected from -(C(R8)2)q-aryl, -(C(R8)2)q -heteroaryl, -(C(R8)2)q- heterocyclyl, -(C(R8)2)n-Q-(C(R8)2)q-aryl, -(C(R8)2)n-Q-(C(R8)2)q-heteroaryl,
-(C(R8)2)n-Q-(C(R8)2)q-heterocyclyl, -(C(R8)2)n-Q-(C(R8)2)n-Q-aryl,
-(C(R8)2)n-Q-(C(R8)2)n-Q-heteroaryl, and -(C(R8)2)n-Q-(C(R8)2)n-Q-heterocyclyl, wherein the heterocyclyl group may optionally be substituted on carbon or nitrogen with a group selected from -R4, -(C(R8)2)q-aryl, -(C(R8)2)q-heteroaryl, -(C(R8)2)q- heterocyclyl, -(C(R8)2)q-SO2R4, or the heterocyclyl group may optionally be substituted on carbon by -(C(R8)2)q-QR4, or the heterocyclyl group may optionally be substituted on nitrogen by -(C(R8)2)n-QR4, and also wherein the aryl or heteroaryl group may optionally be substituted with a group selected from -NO2, cyano, -R4, - (C(R8)2)q-aryl, -(C(R8)2)q-heteroaryl, -(C(R8)2)q-heterocyclyl, -(C(R8)2)q-SO2R4, and - (C(R8)2)q-QR4 and further provided that R2 and R2' may optionally be taken together with the nitrogen to which they are attached, forming a heterocyclic ring, that optionally contains an additional heteroatom, selected from nitrogen, oxygen and sulfur, wherein said formed heterocyclic ring may optionally be substituted on carbon or nitrogen with a group -R4, or said heterocyclic ring may optionally be substituted on carbon by -(C(R8)2)q-QR4, or said heterocyclic ring may optionally be substituted on nitrogen by -(C(R8)2)n-QR4;
R4 is a monovalent group independently selected from alkyl of 1 to 6 carbon atoms, alkenyl of 2 to 6 carbon atoms, and alkynyl of 2 to 6 carbon atoms;
R5 is a divalent group independently selected from alkyl of 1 to 6 carbon atoms, alkenyl of 2 to 6 carbon atoms, and alkynyl of 2 to 6 carbon atoms;
R6 is a divalent alkyl group of 2 to 6 carbon atoms;
R7 is a cycloalkyl ring of 3 to 10 carbon atoms optionally substituted with one or more alkyl groups of 1 to 6 carbon atoms or an aryl or heteroaryl ring, optionally fused to an additional aryl or heteroaryl ring, wherein said aryl or heteroaryl ring optionally fused, may optionally be substituted with 1 to 4 substituents selected from the group consisting of aryl, -CH2-aryl, -NH-aryl, -O-aryl, -S(O)m-aryl, -J, -NO2, -NH2, -OH, -SH, -CN, -N3, -COOH, -CONH2, -NHC(O)NH2, -C(0)H, -CF3, -OCF3, -R4, - OR4, -NHR4, -NR4R4, -S(O)mR4, -NHSO2R4, -R5OH, -R5OR4, -R5NH2, -R5NHR4, - R5NR4R4, -R5SH, -R5S(O)mR4, -NHR6OH, -NHR6OR4, -N(R4)R6OH, -N(R4)R6OR4, - NHR6NH2, -NHR6NHR4, -NHR6NR4R4, -N(R4)R6NH2, -N(R4)R6NHR4, - N(R4)R6NHR4R4, -OR6OH, -OR6OR4, -OR6NH2, -OR6NHR4, -OR6NR4R4, -OC(O)R4, - NHC(O)R4, -NHC(O)NHR4, -OR5C(O)R4, -NHR5C(O)R4,C(O)R4, -C(0)OR4, - C(O)NHR4, -C(O)NR4R4, -R5C(O)H, -R5C(O)R4, -R5C(O)OH, -R5C(O)OR4, -R5C(O)NH2) -R5C(O)NHR4, -R5C(O)NR4R4, -R5OC(O)R4, -R5OC(O)NH2, - R50C(O)NHR4 and -R5OC(O)NR4R4;
R8 is independently -H or -R4;
R9 is a monovalent alkyl group of 1 to 6 carbon atoms; and
pharmaceutically acceptable salts thereof;
which comprises the steps of:
a) reacting a 7-fluoro-4-oxo-1 ,4-dihydro-3-quinolinecarbonitrile of Formula (II)
Figure imgf000006_0001
with a halogenating reagent of the formula PO(Z)3 to provide a 7-fluoro-3- quinolinecarbonitrile 1 where Z is Cl or Br
Figure imgf000006_0002
b) reacting a 7-fluoro-3-quinolinecarbonitrile of formula 1 of step a) with an amine of the formula R1NH2 , e.g. in the presence of pyridine hydrochloride, to provide a 7- f luoro-4-(substituted amino)-3-quinolinecarbonitrile of formula 2
Figure imgf000007_0001
c) reacting a 7-fluoro-4-(substituted amino)-3-quinolinecarbonitrile of formula 2 of step b) with a compound of the formula R2XH, where X is selected from -S-, -O-, -NH-, and -NR2- and where R2' and R2 are as defined above or R2 and R2' may optionally be taken together with the nitrogen to which each is attached to form a heterocyclic ring, and in the presence of a base, when X is -O- or -S-, to provide a 7-substituted-3-quinolinecarbonitrile of Formula (I)
Figure imgf000007_0002
and if so desired converting a compound of Formula (I) to a corresponding pharmaceutically acceptable salt by conventional means, and if so desired, converting the corresponding pharmaceutically acceptable salt to a compound of Formula (I) by conventional means.
This invention also relates to a process for the preparation of 7-substituted-3- quinolinecarbonitriles of Formula (I)
Figure imgf000007_0003
wherein the variables are as defined above, which comprises the step of: reacting a 7-fluoro-4-(substituted amino)-3-quinoIinecarbonitrile of formula 2
Figure imgf000008_0001
with a compound of the formula R2XH, where X is selected from -S-, -O-, -NH-, and - NR2'- and where R2' and R2 are as defined above or R2 and R2'may optionally be taken together with the nitrogen to which each is attached, to form a heterocyclic ring, and in the presence of a base, when X is -O- or -S-, to provide a 7-substituted- 3-quinolinecarbonitrile of Formula (I),
Figure imgf000008_0002
and if so desired converting a compound of Formula (I) to a corresponding pharmaceutically acceptable salt by conventional means, and if so desired, converting the corresponding pharmaceutically acceptable salt to a compound of Formula (I) by conventional means.
This invention further relates to a process for the preparation of 7-substituted-3- quinolinecarbonitriles of Formula (I)
Figure imgf000008_0003
(I) wherein the variables are as defined above,
which comprises the steps of:
a) reacting a 7-fluoro-4-oxo-1 ,4-dihydro-3-quinolinecarbonitrile of Formula (II)
Figure imgf000009_0001
with a compound of the formula R2XH, where X is selected from -S-, -O-, -NH-, and - NR2'- and where R2 and R2 are as defined above or R2 and R2' may optionally be taken together with the nitrogen to which each is attached to form a heterocyclic ring, and in the presence of a base, when X is -O- or -S-, to provide a 7-substituted-4- oxo-1 ,4-dihydro-3-quinolinecarbonitrile of Formula 3
Figure imgf000009_0002
b) reacting a 7-substituted-4-oxo-1 ,4-dihydro-3-quinolinecarbonitrile of step a) with a halogenating reagent, e.g. of the formula PO(Z)3, to provide a 7-substituted-4-halo-3- quinolinecarbonitrile 4 where Z is Cl or Br
Figure imgf000009_0003
c) reacting a 7-substituted-4-halo-3-quinolinecarbonitrile of step b) with an amine R1NH2 , e.g., in the presence of pyridine hydrochloride, to afford a 7-substituted-3- quinolinecarbonitrile of Formula (I)
Figure imgf000010_0001
and if so desired converting a compound of Formula (I) to a corresponding pharmaceutically acceptable salt by conventional means, and if so desired, converting the corresponding pharmaceutically acceptable salt to a compound of Formula (I) by conventional means.
The invention further relates to a process for the preparation of 7-substituted- 4-0X0-1 ,4-dihydro-3-quinolinecarbonitrile of Formula 3
Figure imgf000010_0002
wherein the variables are as defined above, :
which comprises the step of:
reacting a 7-fluoro-4-oxo-1 ,4-dihydro-3-quinolinecarbonitrile of Formula (II)
Figure imgf000010_0003
with a compound of the formula R2XH, where X is selected from -S-, -O-, -NH-, and - NR2- and where R2' and R2 may optionally be taken together with the nitrogen to which each is attached, to form a heterocyclic ring, and in the presence of a base, when X is -O- or -S-, to provide a 7-substituted-4-oxo-1 ,4-dihydro-3- quinolinecarbonitrile of Formula 3.
Figure imgf000011_0001
3 DETAILED DESCRIPTION OF THE INVENTION
The process of the present invention is illustrated in the following reaction schemes. The routes for the preparation of 7-substituted-3-quinolinecarbonitriles of this invention encompassed by Formula (I) is described as follows starting with Scheme 1. 7-Fluoro-4-oxo-1 ,4-dihydro-3-quinolinecarbonitriles of Formula (II) where W is -H or -OR3 are converted to 7-fluoro-3-quinolinecarbonitriles 1 wherein Z is a chloro or bromo group by treatment with a halogenating reagent which includes but is not limited to phosphorous oxychloride and phosphorous oxybromide either neat or optionally in the presence of a cosolvent which includes but is not limited to dichloromethane. Reaction of 7-fluoro-3-quinolinecarbonitrile 1 with an amine R1NH2 l a wherein R1 is as hereinbefore defined may be carried out in a solvent such as 2- ethoxyethanol in the presence of a catalytic or equivalent amount of pyridine hydrochloride results in the formation of intermediate 7-fluoro-4-(substituted amino)- 3-quinolinecarbonitriles 2 where W is hereinbefore defined. Preferably, amine R1NH2 l a is a substituted aniline where R1 is substituted aryl. Displacement of the 7-fluoro group of 7-fluoro-4-(substituted amino)-3-quinolinecarbonitriles_2 with an alkoxide or thioalkoxide anion results in the preparation of 7-substituted-3-quinolinecarbonitriles of Formula (I). This reaction can be performed using an excess of the alcohol R2OH or thiol R2SH as the solvent or an optional cosolvent such as N,N- dimethylformamide, dimethyl sulfoxide or N-methylpyrrolidone can be used. The anion can be generated from the alcohol or thiol 2a where X is O or S by the use of a base. Suitable bases include sodium, sodium hydride, potassium and potassium hydride. Preferred bases are sodium and sodium hydride. Commercially available sodium salts of the alcohol or thiol 2a where X is O or S are used if available. Reaction of a compound of the formula R2XH 2a, where X is -NH-, -NR2'- and where R2' and R2 may optionally be taken together with the nitrogen to which they are attached to form a heterocyclic ring, affords 7-substituted-3-quinolinecarbonitriles of Formula (I).
Scheme 1
Figure imgf000012_0001
+
Figure imgf000012_0002
Examples of R1 in the formula herein are 2,4-dichloro-5-methoxyphenyl; cyclopentyl; butyl; 3,4,5-trimethoxyphenyl; 3-chloro-4- (1 -methyl-1 H-imidazol-2- yl)sulfanyl]phenyl; 2,4-dichorophenyl; 2-chloro-5-methoxyphenyl; 5-methoxy-2- methylphenyl and 2,4-dimethylphenyl.
Examples of R2 in the formulae herein are :2-butynyl; 3-dimethylamino-2,2- dimethylpropyl; 3-(1 ,1-dioxido-4-thiomorpholinyl)propyl; 2-[2-(1- piperazinyl)ethoxy]ethyl; 2-thienylmethyl;benzyl; ethyl; phenyl; 2- methoxyethyl;pyridin-4-yl; 2-(1-methylpiperidin-4-yl)ethyl; 2-(1-methyl-3- piperidinyl)methyl; 2-(1-methyl-4-piperidinyl)methyl;2-(2-methoxy)ethyl;3-
(dimethylamino)propyl; 3-(4-ethyl-1 -piperazinyl)propyl;(1 -methylpiperidine-4- yl)methyl; tetrahydro-2H-pyran-2-ylmethyl;3-(1 -methylpiperidin-4-yl)propyl;(3-
(dimethylamino)propyl)methyl3-(4-methyl)piperazin-1 -yl)propyl;1-methylpiperidin-4- yl)methyl; 1-methylpiperidine-4-yl)methyl; 3-(1-methylpiperidine-4-yl)propyl; 3-(4- methyl-1 -piperazinyl)propyl;(1 -ethylpiperidine-4-yl)methyl; (1 -methylpiperidine-2- yl)methyl; piperidin-4-ylmethyl and 3-(dimethylamino)propyl. A preferred compound of Formula (I) prepared by the process of the present invention is selected from the group consisting of:
7-(2-Butynyloxy)-4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-(3-dimethylamino-2,2-dimethylpropoxy)- 6-methoxy-3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-[3-(1 ,1 -dioxido-4- thiomorpholinyl)propoxy]-6-methoxy-3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-{2-[2-(1- piperazinyl)ethoxy]ethoxy)-3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-(2-thienylmethoxy)-3- quinolinecarbonitrile;
7-Benzyloxy-4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-ethyIsulfanyl-6-methoxy-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-phenylsulfanyl-3- quinolinecarbonitrile;
4-Cyclopentylamino-6-methoxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile;
4-Butylamino-6-methoxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile;
7-Benzylthio-4-[(2,4-dichloro-5-methoxyphenyi)amino]-6-methoxy-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-(pyridin-4-yloxy)-3- quinolinecarbonitrile; 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[2-(1-methyIpiperidin-4- yl)ethoxy]-3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[2-methoxyethoxy]-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[2-(1-methyl-3- piperidinyl)methoxy]-3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[2-(1-methyl-4- piperidinyl)methoxy]-3-quinolinecarbonitrile;
6-Methoxy-7-[2-methoxyethoxy]-4-[(3,4,5-trimethoxyphenyl)amino]-3- quinolinecarbonitrile;
6-Methoxy-7-[(1-methylpiperidine-4-yl)methoxy]-4-[(3,4,5-trimethoxyphenyl)amino]-3- quinolinecarbonitrile;
4-({3-Chloro-4-[(1 -methyl-1 H-imidazol-2-yl)sulfanyl]phenyl}amino)-6-methoxy-7-[2-(2- methoxy)ethoxy]-3-quinolinecarbonitrile;
4-({3-Chloro-4-[(1 -methyl-1 H-imidazol-2-yI)sulfanyl]phenyl}amino)-7-[3- (dimethylamino)propoxy]-6-(2-methoxyethoxy)- 3-quinolinecarbonitrile;
4-({3-Chloro-4-[(1 -methyl-1 H-imidazol-2-yl)sulfanyl]phenyl}amino)-7-[3-(4-ethyl-1 - piperazinyl)propoxy]-6-(2-methoxyethoxy)- 3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-[2-methoxyethoxy]-7-[(1- methylpiperidine-4-yl)methoxy]3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-ethoxy-7-(2-methoxyethoxy)3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-(tetrahydro-2H-pyran-2- ylmethoxy)3-quinolinecarbonitrile; 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-(2-methoxyethoxy)-6-(2-morpholin-4- ylethoxy)3-quinolinecarbonitrile;
4-[3-Chloro-4-(1 -methyl-1 H-imidazol-2-ylsulfanyl)-phenylamino]-6-methoxy-7-(4- methylpiperazin-1-yl)-quinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-{[3-(1-methylpiperidin-4- yl)propyl]amino}quinoline-3-carbonitrile;
4-[3-Chloro-4-(1-methyI-1 H-imidazol-2-ylsulfanyl)-phenylamino]-7-{[3- (dimethyl)aminopropyl]amino}-6-methoxyquinoline-3-carbonitrile;
4-[3-Chloro-4-(1 -methyl-1 H-imidazol-2-ylsulfanyl)-phenylamino]-7-{[3- (dimethylamino)propyl]-methylamino}-6-methoxyquinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-[3-(4-methyl)piperazin-1-yl)propoxy]-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-[(1-methylpiperidin-4-yl)methoxy]-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-(2-methoxyethoxy)-3- quinolinecarbonitrile;
4-[(2,4-Dichorophenyl)amino]-6-methoxy-7-(2-methoxyethoxy)quinoline-3- carbonitrile;
4-[(2,4-Dimethyl-5-methoxyphenyl)amino]-6-methoxy-7-(2-methoxyethoxy)quinoline- 3-carbonitrile;
4-[(2-Chloro-5-methoxyphenyl)amino]-6-methoxy-7-(2-methoxyethoxy)quinoline-3- carbonitrile;
6-Methoxy-7-(2-methoxyethoxy)-4-[(5-methoxy-2-methylphenyl)amino]-quinoline-3- carbonitrile; 4-[(2,4-DimethyIphenyl)amino]-6-methoxy-7-(2-methoxyethoxy)quinoline-3- carbonitrile;
4-[(2,4-Dichlorophenyl)amino]-6-methoxy-7-[(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile;
4-[(2,4-Dimethyl-5-methoxyphenyl)amino]-6-methoxy-7-[(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile;
6-Methoxy-4-[(5-methoxy-2-methylphenyl)amino]-7-[(1 -methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile;
4-[(2-Chloro-5-methoxyphenyl)amino]-6-methoxy-7-[(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile;
4-[(2,4-Dimethylphenyl)amino]-6-methoxy-7-[(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(1-methylpiperidine-4- yl)propoxy]quinoline-3-carbonitrile;
4-[(2-Chloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(1-methylpiperidine-4- yl)propoxy]quinoline-3-carbonitrile;
6-Methoxy-4-[(5-methoxy-2-methylphenyl)amino]-7-[3-(1-methylpiperidine-4- yl)propoxy]quinoline-3-carbonitrile;
4-[(2,4-Dimethylphenyl)amino]-6-methoxy-7-[3(1-methylpiperidine-4- yl)propoxy]quinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(4-methyl-1- piperazinyl)propoxy]quinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-[(1-ethylpiperidine-4-yl)methoxy]-6- methoxyquinoline-3-carbonitrile; 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[(1-methylpiperidine-2- yl)methoxy]quinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-(piperidin-4- ylmethoxy)quinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-{[3-(dimethylamino)propyl]amino}-6- methoxyquinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-{[3- (dimethylamino)propyl](methyl)amino]-6-methoxyquinoline-3-carbonitrile; and
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[(2- methoxyethyl)amino]quinoline-3-carbonitrile.
An alternative route to 7-substituted-3-quinolinecarbonitriles of Formula (I) is described in Scheme 2. 7-Fluoro-4-oxo-1 ,4-dihydro-3-quinolinecarbonitriles of Formula (II) where W is hereinbefore defined are converted to 7-substituted-4-oxo- 1 ,4-dihydro-3-quinolinecarbonitriles 3 by replacement of the 7-fluoro group with an alkoxide or thioalkoxide anion. This reaction can be performed using an excess of the alcohol or thiol as the solvent or optionally a cosolvent such as N,N- dimethylformamide, dimethyl sulfoxide or N-methylpyrrolidone may be used. The anion may be generated from the alcohol or thiol 2a where X is O or S respectively by the use of a base. Suitable bases include sodium, sodium hydride, potassium and potassium hydride. Preferred bases are sodium and sodium hydride. Commercially available sodium salts of the alcohol or thiol 2a where X is O or S are used if available. Reaction of 7-fluoro-4-oxo-1 ,4-dihydro-3-quinolinecarbonitriles of Formula (II) with a compound of the formula R2XH 2a, where X is -NH-, -NR2'- and where R2' and R2 may optionally be taken together with the nitrogen to which they are attached to form a heterocyclic ring, to afford 7-substituted-4-oxo-1 ,4-dihydro-3- quinolinecarbonitriles 3. Treatment of 7-substituted-4-oxo-1 ,4-dihydro-3- quinolinecarbonitriles 3 with a halogenating reagent PO(Z)3 wherein Z is a chloro or bromo group which include but not limited to phosphorous oxychloride, phosphorous oxybromide either neat or optionally in the presence of a cosolvent which include but not limited to dichloromethane affords 7-substituted-4-halo-3-quinolinecarbonitriles 4 which are further reacted with an amine l a wherein R is as hereinbefore defined in a solvent such as 2-ethoxyethanol in the presence of a catalytic or equivalent amount of pyridine hydrochloride results in the formation of 7-substituted-3- quinolinecarbonitriles of Formula (I). Preferably amine R1NH2 l a is a substituted aniline where R1 is substituted aryl.
Scheme 2
Figure imgf000018_0001
0)
A preferred compound of formula (I) prepared by the process of the present invention is:
4-[(2,4-Dichlorophenyl)amino]-7-(2-methoxyethoxy)quinoline-3-carbonitrile;
6-Butoxy-4-[(2,4-dichloro-5-methoxyphenyl)amino]-7-(2-methoxyethoxy)-3- quinolinecarbonitrile;
6-Methoxy-7-(4-methylpiperazin-1 -yl)-4-(4-phenoxyphenylamino)-quinoline-3- carbonitrile; and
6-Methoxy-7-(1 -methyI-piperidin-4-ylmethoxy)-4-{[4-(pyridin-3-yloxy)- phenyl]amino}quinoline-3-carbonitrile A preferred compound of formula 3 prepared by the process of the present invention is selected from the group consisting of:
6-Methoxy-7-(2-methoxyethoxy)-4-oxo-1 ,4,-dihydro-3-quinolinecarbonitrile;
6-Methoxy-7-(4-methyl-piperazin-1 -yl)-4-oxo-1 ,4-dihydroquinoline-3-carbonitrile; and
7-(2-Methoxyethoxy)-4-oxo-1 ,4-dihydroquinoline-3-carbonitrile.
An alternative approach, as shown in Scheme 3, for the preparation of 7- substituted-3-quinolinecarbonitriles of Formula (I) uses a protecting group of the hydroxy group at C-6 of the 3-quinolinecarbonitrile 5. The protecting group is designated R3' and includes but is not limited to groups including benzyl and isopropyl which may be removed to provide the 6-hydroxy derivative 6. Specifically, if R3 is a benzyl protecting group, the desired hydroxy group can be obtained by treatment with trifluoroacetic acid in the presence of thioanisole. Further, if R3 is an isopropyl protecting group, the desired 6-hydroxy derivative 6 may be obtained by treatment with aluminum trichloride. Further reaction of 6-hydroxy derivative 6 with an alcohol R3OH 6a in the presence of triphenyl phosphine (Ph3P) where Ph is phenyl and diethylazodicarboxylate (DEAD), in a solvent such as tetrahydrofuran affords 4-halo-3-quinolinecarbonitriles 7.
Scheme 3
Figure imgf000019_0001
Z = Cl or Br Z = Cl or Br Z = Cl or Br R3' = protecting group
Additional intermediates may be prepared as shown in Scheme 4 where 4-halo-3- quinolinecarbonitriles 8 with R2 and R3' as hereinbefore defined are deprotected to afford 6-hydroxyquinolines 9 using conditions as defined for deprotection in Scheme 3. Further reaction of 6-hydroxy derivatives 9 with an alcohol R3OH 6a in the presence of triphenyl phosphine (Ph3P) where Ph is phenyl, and diethylazodicarboxylate (DEAD), in a solvent such as tetrahydrofuran affords 4-halo- 3-quinolinecarbonitriles 10 which may be further reacted with an amine R NH2 l a to afford 7-substituted-3-quinolinecarbonitriles 11.. Preferably amine R1NH2 la is a substituted aniline where R1 is substituted aryl.
Scheme 4
Figure imgf000020_0001
8 9
Z = Cl or Br Z = Cl or Br
R3' = protecting group
Figure imgf000020_0002
10 Z = Cl or Br
Figure imgf000020_0003
11
The 7-substituted-4-oxo-1 ,4-dihydro-3-quinolinecarbonitriles 3 and 7-substituted-4- halo-3-quinolinecarbonitriles 4 are key intermediates used to prepare 7-substituted-3- quinolinecarbonitriles of Formula (I). Scheme 5 shows two alternate routes for the preparation of additional key intermediates, 7-f luoro-4-oxo-1 ,4-dihydro-3- quinolinecarbonitriles of Formula (II). Anilines .12 may be treated with ethyl (ethoxymethylene)cyanoacetate either neat or optionally in the presence of a cosolvent such as toluene, at temperatures ranging from about 60 to about 120°C followed by subsequent thermal cyclization, preferably in a eutectic solvent system which includes a 3: 1 mixture of diphenyl ether (Ph-O-Ph) and biphenyl(Ph-Ph) at a temperature range of about 240° to about 260°, affords 7-fluoro-4-oxo-1 ,4-dihydro-3- quinolinecarbonitriles of Formula (II). Alternatively, aniline 12 is reacted with diethyl (ethoxymethylene)malonate either neat or optionally in the presence of a cosolvent toluene, at temperatures ranging from about 60 to about 120°C. Subsequent thermal cyclization, preferably in a eutectic solvent system which includes 3: 1 mixture of diphenyl ether and biphenyl at elevated temperature, at a temperature range of about 240° to about 260°C, provides ester 13. Hydrolysis of the ester 13 under preferably basic conditions, such as sodium hydroxide in an alcoholic solvent such as ethanol, at reflux temperatures results in carboxylic acid 14. Conversion of carboxylic acid 14 to primary amide 15 may be accomplished by treatment with an activating agent which includes N,N-carbonyl diimidazole(CDI) or oxalyl chloride followed by the addition of either ammonia gas or preferably an aqueous solution of ammonium hydroxide. Dehydration of primary amide 15 with a reagent such as cyanuric chloride in a solvent such as N,N-dimethylformamide provides 7-fluoro-4-oxo-1 ,4- dihydro-3-quinolinecarbonitriles of Formula (II).
Scheme 5
Figure imgf000022_0001
Alternatively compounds of Formula (II) may be prepared as shown in
Scheme 6 from the corresponding anthranilic acid or ester |6 where R10 is H or alkyl of 1 to 6 carbon atoms by reaction with N,N-dimethylformamide dimethyl acetal or preferably with N,N-dimethylformamide diethylacetal, optionally in the presence of a cosolvent toluene at about 100-130°C to provide amidine 17. Reaction of the anion of acetonitrile, preferably generated from the reaction of n-butyl lithium with acetonitrile, in an inert solvent such as tetrahydrofuran at about -78°C, with amidine
17 provides compounds of Formula (II).
Scheme 6
m
Figure imgf000023_0001
The compounds of this invention are prepared from: (a) commercially available starting materials (b) known starting materials which can be prepared as described in literature procedures or (c) new intermediates described in the schemes and experimental procedures herein.
Reactions are performed in a solvent appropriate to the reagents and materials employed and suitable for the transformation being effected. It is understood by those skilled in the art of organic synthesis that the various functionalities present on the molecule must be consistent with the chemical transformations proposed. This may necessitate judgement as to the order of synthetic steps, protecting groups, if required, and deprotection conditions. Substituents on the starting materials may be incompatible with some of the reaction conditions. Such restrictions to the substituents which are compatible with the reaction conditions will be apparent to one skilled in the art. Reactions are run under inert atmospheres where appropriate. The pharmaceutically acceptable salts are those derived from such organic and inorganic acids as: acetic, lactic, citric, tartaric, succinic, maleic, malonic, gluconic, hydrochloric, hydrobromic, phosphoric, nitric, sulfuric, methanesulfonic and similarly known acceptable acids.
Alkyl as used herein means a branched or straight chain radical having from 1 to 6 carbon atoms optionally substituted.
Alkenyl as used herein means a branched or straight chain radical having 2 to 6 carbon atoms optionally substituted. The chain having at least one double bond.
Alkynyl as used herein means a branched or straight chain radical having from 2 to 6 carbon atoms optionally substituted. The chain having at least one triple bond.
Alkoxy as used herein means an alkyl-O- group in which the alkyl group is as previously described. Exemplary alkoxy groups include but are not limited to methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, and t-butoxy.
Cycloalkyl as used herein means a saturated ring system having from 3 to 10 carbon atoms. Preferred is 3 or 7 carbon atoms. Exemplary cycloalkyl rings include but are not limited to cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and the like.
Aryl as used herein means a mono or bicyclic aromatic ring having from 6 to 12 carbon atoms. Monocyclic rings preferably have 6 members and bicyclic rings preferably have 8, 9, 10 or 12 membered ring structures. Exemplary aryl groups include phenyl, alpha-naphthyl, beta-naphthyl, indene, and the like independently substituted with one or more substituents and more preferably with 1 to 4 substituents.
Heteroaryl denotes an unsubstituted or optionally substituted monocyclic 5 or 6 membered ring, which contains 1 to 4, or particularly 1 or 2 heteroatoms which may be the same or different. Nitrogen, oxygen and sulfur are the preferred heteroatoms, provided that the heteroaryl does not contain O-O, S-S or S-O bonds. Specific examples include thiophene, furan, pyrrole, pyrazole, imidazole, 1 ,2,3-triazole, 1 ,2,4- triazole, tetrazole, thiazole, oxazole, isothiazole, isoxazole, 1 ,3,4-oxadiazole, 1 ,2,4- oxadiazole, 1 ,3,4-thiadiazole, pyridine, pyrimidine, pyrazine, pyridazine and 1 ,3,5- triazine. The heteroaryl ring may be oxidized when a heteroatom is a nitrogen atom to provide the corresponding N-oxide, including pyridine -N-oxide or the heterocyclic ring may contain a carbonyl group on one of the carbon atoms, such as 1 ,3,4- oxadiazol-2-one.
Bicyclic heteroaryl as used herein refers to saturated or partially unsaturated bicyclic fused rings having 8 to 20 ring atoms containing 1 to 4 heteroatoms which may be the same or different independently selected from nitrogen, oxygen and sulfur optionally substituted with 1 to 3 independently selected substituents which may be the same or different provided that the bicyclic heteroaryl does not contain O-O, S-S or S-O bonds. Specific examples include: indole, 2,3-dihydroindole, 2-indazole, isoindazole, quinoline, isoquinoline, tetrahydroquinoline, benzofuran, benzothiophene, benzimidazole, benzotriazole, benzothiazole, benzoxazole, benzisoxazole, 1 ,2- benzopyran, cinnoline, phthalazine, quinazoline, 1 ,8-naphthyridine, pyrido[3,2- b]pyridine, pyrido[3,4-b]pyridine, pyrido[4,3-b]pyridine, pyrido[2,3-d]pyrimidine, purine, and pteridine and the like. Either or both rings of the bicyclic ring system may be partially saturated, or fully saturated, and the bicyclic group may be oxidized on a nitrogen atom to provide the corresponding N-oxide, such as quinoline -N-oxide, or the bicyclic ring system may contain a carbonyl group on one of the carbon atoms, such as 2-indanone.
Heterocyclyl, heterocyclyl group or heterocyclic ring means a saturated or partially unsaturated monocyclic radical containing preferably 3 to 8 ring atoms, more preferably 3 to 7 ring atoms and most preferably 5 to 6 ring atoms selected from carbon, nitrogen, oxygen and sulfur with at least 1 and preferably 1 to 4, more preferably 1 to 2 nitrogen, oxygen or sulfur as ring atoms. Specific examples include but are not limited to morpholine, thiomorpholine, thiomorpholine-S-oxide, thiomorpholine-S,S-dioxide, piperidine, N-alkylpiperidine, piperazine, N- alkylpiperazine, pyrrolidine, aziridine, oxirane, tetrahydrothiophene, tetrahydrofuran, 1 ,2-pyran, 1 ,4-pyran, dioxane, 1 ,3-dioxolane and tetrahyd ropy ran. The heterocyclyl ring may be oxidized on a tri-substituted nitrogen atom to provide the corresponding
N-oxide, such as N-ethylpiperazine-N-oxide, or the heterocyclyl ring may contain a carbonyl group on one of the carbon atoms, such as pyrrolidinone. In order to facilitate a further understanding of the invention, the following non-limiting examples illustrate the process of the present invention.
Reference Example 1
Ethyl 7-fluoro-6-methoxy-4-oxo-1 ,4-dihvdro-3-quinolinecarboxylate
A mixture of 3-fluoro-4-methoxyaniline (3.00 g, 21.26 mmol) and diethyl ethoxymethylene malonate (4.59 g, 21.26 mmol) is heated at 110°C for 1 hour then cooled to room temperature. Hexane is added and the solids collected by filtration. This material is suspended in 45 mL of a 3 : 1 mixture of diphenyl ether : biphenyl and the mixture is heated at reflux for 2 hours to provide a brown solution. The reaction mixture is cooled to room temperature and hexane is added. The resultant solid is collected by filtration washing with hexane to provide 2.62 g of ethyl 7-fluoro- 6-methoxy-4-oxo-1 ,4-dihydro-3-quinolinecarboxylate as a white solid, mp >300°C.
MS 265.9 (M+H)+
Analysis for C13H12FN04
Calcd: C, 58.87; H, 4.56; N, 5.28.
Found: C, 58.66; H, 4.16; N, 5.14.
Reference Example 2
7-Fluoro-6-methoxy-4-oxo-1 ,4-dihvdro-3-quinolinecarboxylic acid
A mixture of ethyl 7-fluoro-6-methoxy-4-oxo-1 ,4-dihydro-3-quinolinecarboxylate (2.2 g, 8.30 mmol) and 13.2 mL of 1 N sodium hydroxide and 40 mL of ethanol is heated at reflux for 3 hours then cooled to room temperature. Water is added and the mixture is acidified with acetic acid. The resultant solid is collected by filtration washing with water to provide 1.90 g of 7-fluoro-6-methoxy-4-oxo-1 ,4,-dihydro-3- quinolinecarboxylic acid as a white solid, mp 265-267°C.
MS 238.1 (M+H)+ Analysis for CnH8FNO4 - 1.2 H2O
Calcd: C, 51.04; H, 4.03; N, 5.41.
Found: C, 50.98; H, 3.95; N, 5.33.
Reference Example 3
7-Fluoro-6-methoxy-4-oxo-1 ,4-dihvdro-3-quinolinecarboxamide
A mixture of 7-fluoro-6-methoxy-4-oxo-1 ,4-dihydro-3-quinolinecarboxylic acid (1.0 g, 4.21 mmol) and N,N'-carbonyldiimidazole (1.51 g, 9.28 mmol) in 14 mL of N,N- dimethylformamide is heated at 65°C for 2 hours then cooled to room temperature and poured into 200 mL of aqueous ammonium hydroxide in an ice water bath. The solution is allowed to stir at room temperature overnight and then concentrated to a small volume. Ice cold water is added followed by acidification with acetic acid. The resultant solid is collected by filtration washing with water to provide 821 mg of 7- fluoro-6-methoxy-4-oxo-1 ,4-dihydro-3-quinolinecarboxamide as a white solid, mp >300°C.
MS 236.8 (M+H)+
Analysis for CnHgFNgOa - 0.2 H2O
Calcd: C, 55.09; H, 3.94; N, 11.68.
Found: C, 55.00; H, 3.63; N, 11.49.
Reference Example 4
7-Fluoro-6-methoxy-4-oxo-1 ,4-dihvdro-3-quinolinecarbonitrile
A mixture of 7-fluoro-6-methoxy-4-oxo-1 ,4,-dihydro-3-quinolinecarboxamide (700 mg, 3.0 mmol) and cyanuric chloride (341 mg, 1.65 mmol) in 15 mL of N, N,- dimethylformamide is heated at 65°C for 6 hours then cooled to room temperature and an additional 206 mg of cyanuric chloride is added. The mixture is heated at 65°C for 4 hours then stirred overnight at room temperature. The reaction mixture is poured into ice water and neutralized with saturated sodium bicarbonate. The solids are collected by filtration washing with water and hexane to provide 610 mg of crude product. Purification by flash column chromatography eluting with a gradient of 3% methanol in dichloromethane to 10% methanol in dichloromethane, provides 272 mg of 7-f luoro-6-methoxy-4-oxo-1 ,4-dihydro-3-quinolinecarbonitrile, mp 147-149°C.
MS 216.8 (M-H)-
Analysis for CnH7FN2O2- 0.1 dichloromethane
Calcd: C, 58.80; H, 3.19; N, 12.36.
Found: C, 59.06; H, 2.96; N, 11.97.
Reference Example 4
Alternate Preparation of
7-Fluoro-6-methoxy-4-oxo-1 ,4-dihvdro-3-quinolinecarbonitrile
A mixture of 3-fluoro-4-methoxyaniline (15.31 g, 108 mmol) and ethyl (ethoxymethylene)cyanoacetate (18.36 g, 108 mmol) in toluene is heated at 100- 110°C for 4.5 hours then cooled to room temperature. A 1 : 1 mixture of hexane and ethyl acetate is added and the mixture is cooled on an ice bath. The solids are collected washing with hexane to provide a first crop of 26.10 g and a second crop of 1.24 g. A 2.0 g portion of this material is added to 18 mL of a 3 : 1 mixture of diphenyl ether : biphenyl that is heated to reflux. This mixture is heated at reflux for 4 hours then cooled and poured into hexane. The solids are collected by filtration and washed with ethyl acetate and hexane to provide 624 mg of 7-fluoro-6-methoxy-4- oxo-1 ,4,-dihydro-3-quinolinecarbonitrile as a brown solid. The filtrate is concentrated, the residue is dissolved in ethyl acetate and hexane is added. The resultant solid is collected by filtration to give 1.07 g of 7-fluoro-6-methoxy-4-oxo-1 ,4-dihydro-3- quinolinecarbonitrile as a yellow solid. Reference Example 5
4-Chloro-7-fluoro-6-methoxy-3-quinolinecarbonitrile
A mixture of 7-fluoro-6-methoxy-4-oxo-1 ,4-dihydro-3-quinolinecarbonitrile (1.0 g, 4.59 mmol) and 14 g of phosphorous oxychloride is heated at reflux for 30 minutes then concentrated in vacuo. The residue is partitioned between aqueous sodium bicarbonate and ethyl acetate. The organic layer is dried over magnesium sulfate, filtered and concentrated on to silica gel. Purification by flash column chromatography eluting with a gradient of 1 : 5 ethyl acetate : hexane to 1 : 1 ethyl acetate : hexane, provides 631 mg of 4-chloro-7-fluoro-6-methoxy-3- quinolinecarbonitrile, mp 160-162°C.
MS 236.9 (M+H)+
Analysis for C-nHβCIFN≥O
Calcd: C, 55.83; H, 2.56; N, 11.84.
Found: C, 55.66; H, 2.84; N, 11.91.
Reference Example 6
6-Methoxy-7-(2-methoxyethoxy)-4-oxo-1.4.-dihvdro-3-quinolinecarbonitrile
Sodium (84 mg, 3.67 mmol) is added to 3.6 mL of 2-methoxyethanol and the mixture is heated at reflux for 90 minutes. 7-Fluoro-6-methoxy-4-oxo-1 ,4,-dihydro-3- quinolinecarbonitrile (200 mg, 0.92 mmol) is added and the reaction mixture is heated at reflux for 4 hours then stirred at room temperature overnight. The reaction mixture is poured into ice water and acidified with acetic acid. The solids are collected by filtration, washing with ethyl acetate and hexane, to provide 234 mg of 6-methoxy-7-(2-methoxyethoxy)-4-oxo-1 ,4,-dihydro-3-quinolinecarbonitrile, mp > 300°C.
MS 272.9 (M-H)- Analysis for C14Hι4N2O4- 0.15 ethyl acetate
Calcd: C, 60.99; H, 5.31; N, 9.75.
Found: C, 61.12; H, 5.29; N, 9.49.
Reference Example 7
4-Chloro-6-methoxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile
A mixture of 6-methoxy-7-(2-methoxyethoxy)-4-oxo-1,4,-dihydro-3- quinolinecarbonitrile (180 mg , 0.66 mmol) and 2.02 g of phosphorous oxychloride is heated at reflux for 40 minutes then concentrated in vacuo. The residue is added to water and the pH is adjusted to 8 by the addition of aqueous sodium bicarbonate. The solids are collected by filtration, washing with water and hexane, to provide 169 mg of 4-chloro-6-methoxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile, mp 178- 180°C.
MS 292.9 (M+H)+
Analysis for C14H14N2O4- 0.60 H2O
Calcd: C, 55.39; H, 4.70; N, 9.23.
Found: C, 55.23; H, 4.30; N, 8.87.
Reference Example 8
4-F(2.4-Dichloro-5-methoxyphenyl)amino1-7-fluoro-6-methoxy-3-quinolinecarbonitrile
A mixture of 4-chloro-7-fluoro-6-methoxy-3-quinolinecarbonitrile (4.12 g , 18 mmol) 2,4-dichloro-5-methoxyaniline (4.56 g, 24 mmol) (Theodoridis, G.; Pestic. Sci. 1990, 30, 259) and pyridine hydrochloride (2.31 g, 19.9 mmol) in 45 mL of 2-ethoxyethanol is heated at 120°C for 3 hours then cooled to room temperature. The reaction mixture is added to aqueous sodium bicarbonate and stirred for 20 minutes. The solids are collected by filtration to provide 4.89 g of 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-fluoro-6-methoxy-3-quinolinecarbonitrile, mp >260°C. HRMS theory 392.03634; found 392.03556 (M+H)+
Analysis for C18H12CI2FN3O2- 2.0 H2O
Calcd: C, 50.48; H, 3.77; N, 9.81.
Found: C, 50.41 ; H, 2.82; N, 9.78.
Reference Example 9
4-Cvclopentylamino-7-fluoro-6-methoxy-3-quinolinecarbonitrile
A mixture of 4-chloro-7-fluoro-6-methoxy-3-quinolinecarbonitrile (400 mg , 1.69 mmol) and cyclopentylamine (307 mg, 3.72 mmol) in 11 mL of 2-ethoxyethanol is heated at 100°C for 1.5 hours then cooled to room temperature. The reaction mixture is concentrated in vacuo and aqueous sodium bicarbonate is added to the residue. After stirring for 20 minutes, the solids are collected by filtration. Purification by preparative thin layer chromatography, eluting with 5% methanol in dichloromethane, followed by trituration with diethyl ether and hexane, provides 359 mg of 4-cyclopentylamino-7-fluoro-6-methoxy-3-quinolinecarbonitrile, mp 162-164°C.
MS 286.13 (M+H)+
Analysis for C16H16FN3O- 0.25 H2O
Calcd: C, 66.31 ; H, 5.74; N, 14.50.
Found: C, 66.38; H, 5.80; N, 14.45.
Reference Example 10
4-Butylamino-7-fluoro-6-methoxy-3-quinolinecarbonitrile
A mixture of 4-chloro-7-fluoro-6-methoxy-3-quinolinecarbonitrile (300 mg , 1.27 mmol) and butylamine (205 mg, 2.80 mmol) in 10 mL of 2-ethoxyethanol is heated at 80°C for 1.5 hours then cooled to room temperature. The reaction mixture is concentrated in vacuo and aqueous sodium bicarbonate is added to the residue. After stirring for 20 minutes, the solids are collected by filtration. Purification by preparative thin layer chromatography, eluting with 2% methanol in dichloromethane provides 230 mg of 4-butylamino-7-f luoro-6-methoxy-3-quinolinecarbonitrile, mp 155- 156°C.
MS 274.2 (M+H)+
Analysis for C15H16FN3O- 0.2 H2O
Calcd: C, 65.06; H, 5.98; N, 15.17.
Found: C, 65.02; H, 5.91 ; N, 15.03.
Reference Example 11
6-Benzyloxy-7-f luoro -4-oxo-1 , 4-dihydro-3-quinolinecarbonitrile
A mixture of 4-benzyloxy-3-fluoroaniline (6.06 g, 27.9 mmol) (US 5,622,967) and ethyl (ethoxymethylene)cyanoacetate (5.08 g, 30.0 mmol) is heated at 120°C for 45 minutes then cooled to room temperature. This solid is added in portions to a 3 : 1 mixture of diphenyl ether : biphenyl at 245 °C. This mixture is heated at 245°C for 3 hours then cooled and the solids are collected by filtration, washing with hexane and diethyl ether to provides 2.60 g of 6-benzyloxy-7-f luoro-4-oxo-1 , 4-dihydro-3- quinolinecarbonitr ile, mp >250°C.
MS 293.1 (M-H)-
Ref erence Example 12
6-Benzyloxy-4-chloro-7-fluoro-3-quinolinecarbonitrile
A mixture of 7-fluoro-6-methoxy-4-oxo-1 , 4-dihydro-3-quinolinecarbonitrile (645 mg, 2.19 mmol) and 10 mL of phosphorous oxychloride is heated at 115°C for 1.5 hours then concentrated in vacuo. The residue is treated with ice cold aqueous ammonium hydroxide and the resultant solid is collected by filtration. Purification by flash column chromatography eluting with a gradient of 1% ethyl acetate in hexane to 6% ethyl acetate in hexane, provides 284 mg of 6-benzyloxy-4-chloro-7-fluoro-3- quinolinecarbonitrile, mp 159-160°C. MS 313.13 (M+H)+
Analysis for C17H10CIFN2O
Calcd: C, 65.15; H, 3.06; N, 8.82.
Found: C, 65.29; H, 3.22; N, 8.96.
Reference Example 13
4-Chloro-7-fluoro-6-hydroxy-3-quinolinecarbonitrile
A mixture of 6-benzyloxy-4-chloro-7-fluoro-3-quinolinecarbonitrile (733 mg, 2.34 mmol) and 1 mL of thioanisole in 12 mL of trifluoroacetic acid is heated at reflux for 9 hours then concentrated in vacuo. The residue is treated with ice water and then basified to pH 9-10 by the addition of aqueous ammonium hydroxide. The resultant solid is collected by filtration and washed with diethyl ether. The filtrate is extracted with 10% methanol in ethyl acetate. The organic layer is dried over sodium sulfate, filtered and concentrated in vacuo. The residue is combined with the solid obtained initially, and this material is dissolved in 5% methanol in ethyl acetate and absorbed onto silica gel. Purification by flash column chromatography eluting with a gradient of hexane to increasing amounts of ethyl acetate in hexane to 5% methanol in ethyl acetate provides 260 mg of 4-chloro-7-fluoro-6-hydroxy-3-quinolinecarbonitrile, mp >250°C.
MS 220.9 (M-H)-
Analysis for C, 0H4CI FN2O
Calcd: C, 53.96; H, 1.81 ; N, 12.58.
Found: C, 54.23; H, 2.02; N, 12.06. Reference Example 14
4-Chloro-6-ethoxy-7-fluoro-3-quinolinecarbonitrile
To a 0°C mixture of 4-chloro-7-f luoro-6-hydroxy-3-quinolinecarbonitrile (185 mg, 0.83 mmol), triphenylphosphine (392 mg, 1.49 mmol) and ethanol (153 mg, 3.32 mmol) in 15 mL of tetrahydrofuran is added diethylazodicarboxylate (260 mg, 1.80 mmol). The reaction mixture is kept at 0°C for 45 minutes then stirred at room temperature overnight. The reaction mixture is concentrated in vacuo and purified by flash column chromatography eluting with a gradient of 1% ethyl acetate in hexane to 5% ethyl acetate in hexane provides 4-chloro-6-ethoxy-7-fluoro-3-quinolinecarbonitrile, mp 165-166°C.
MS 251.0 (M+H)+
Analysis for C12H8CIFN2O
Calcd: C, 57.50; H, 3.22; N, 11.18.
Found: C, 57.24; H, 3.41 ; N, 11.09.
Reference Example 15
7-Fluoro-6-methoxy-4-r(3.4.5-trimethoxyphenyl)amino1-3-quinolinecarbonitrile
A mixture of 4-chloro-7-fluoro-6-methoxy-3-quinolinecarbonitrile (500 mg , 2.1 1 mmol), 3,4,5-trimethoxyaniline (515 mg, 2.81 mmol) and pyridine hydrochloride (270 mg , 2.33 mmol) in 20 mL of 2-ethoxyethanol is heated at reflux for 4 hours then cooled to room temperature. The reaction mixture is poured into aqueous sodium bicarbonate and stirred at room temperature for 15 minutes. The solid is collected by filtration and partitioned between water and ethyl acetate. The organic layer is dried over magnesium sulfate, filtered and concentrated in vacuo. Trituration of the residue with ethyl acetate and diethyl ether provides 512 mg of 7-fluoro-6-methoxy-4- [(3,4,5-trimethoxyphenyl)amino]-3-quinolinecarbonitrile, mp 215-217°C.
MS 384.10 (M+H)+ Analysis for C20H18CI2FN3O4- 0.8 H2O
Calcd: C, 60.39; H, 4.97; N, 10.56.
Found: C, 60.75; H, 4.86; N, 10.16.
Reference Example 16
2-Fluoro-1-,2-methoxyethoxy)-4-nitrobenzene
A mixture of 2-fluoro-5-nitrophenol (10.0 g , 63.7 mmol), 2-bromoethyl methyl ether (15.0 g, 107.9 mmol) and potassium carbonate (26.5 g , 192 mmol) in 40 mL of N, N'-dimethylformamide is heated at 70°C for 4 hours then cooled to room temperature and poured onto ice. The solid is collected by filtration washed with water and dried to provide 12.0 g of 2-fluoro-1-(2-methoxyethoxy)-4-nitrobenzene, mp 62-63°C.
MS 216.02 (M+H)+
Analysis for C9H10FNO4
Calcd: C, 50.24; H, 4.68; N, 6.51.
Found: C, 50.24; H, 4.67; N, 6.49.
Reference Example 17
3-Fluoro-4-(2-methoxyethoxy)aniline
A mixture of 2-fluoro-1-(2-methoxyethoxy)-4-nitrobenzene (12.0 g , 55.7 mmol), iron powder (10.3 g, 180 mmol) and ammonium chloride (14.5 g , 270 mmol) in 170 mL of ethanol and 50 mL of water is heated at reflux for 1.5 hours then filtered hot through a pad of Diatomaceous earth, washing with ethanol. The filtrate is cooled to room temperature and the precipitated solids are removed by filtration. The filtrate is concentrated to a small volume and partitioned between ethyl acetate and water. The organic layer is dried over magnesium sulfate, filtered and concentrated in vacuo to provide 9.45 g of 3-fluoro-4-(2-methoxyethoxy)aniline as a brown liquid. MS 186.13 (M+H)+
Analysis for C9Hι2FNO2-0.2 equiv H2O
Calcd: C, 57.25; H, 6.62; N, 7.46.
Found: C, 57.55; H, 6.27; N, 7.50.
Reference Example 18
4-Chloro-7-fluoro-6-(2-methoxyethoxy)-3-quinolinecarbonitrile
Following the procedure of Reference Example 4, a mixture of 3-fluoro-4-(2- methoxyethoxy)aniline (6.39 g, 34.5 mmol) and ethyl (ethoxymethylene)- cyanoacetate (5.84 g, 34.5 mmol) provides 7.62 g of a brown solid. Following the procedure of Reference Example 5, this solid is converted to 6.0 g of 4-chloro-7- fluoro-6-(2-methoxyethoxy)-3-quinolinecarbonitrile, mp 130-138°C.
MS 281.02, 282.98 (M+H)+
Analysis for C13H10CIFN2O2-0.1 equiv H2O
Calcd: C, 55.27; H, 3.64; N, 9.92.
Found: C, 55.02; H, 3.64; N, 9.64.
Reference Example 19
4-({3-Chloro-4-r(1-methyl-1 H-imidazol-2-yl)sulfanvnphenyl)amino)-7-fluoro-6-(2- methoxyethoxy)-3-quinolinecarbonitrile
A mixture of 4-chloro-7-fluoro-6-(2-methoxyethoxy)-3-quinolinecarbonitrile (2.72 g , 9.7 mmol), 3-chloro-4-[(1 -methyl-1 H-imidzazol-2-yl)thio]-benzamide (US4973599) (2.56 g, 10.6 mmol) and pyridine hydrochloride (1.2 g, 10.4 mmol) in 35 mL of 2- ethoxyethanol is heated at 110°C for 1.5 hours then cooled to room temperature. The solids are collected by filtration, washed with diethyl ether and suspended in saturated sodium bicarbonate. After stirring for 1.5 hours, the solids are collected by filtration to provide 2.92 g of 4-({3-chloro-4-[(1 -methyl-1 H-imidazoI-2- yl)sulfanyl]phenyl}amino)-7-fluoro-6-(2-methoxyethoxy)-3-quinolinecarbonitrile, mp 265-270°C.
MS 484.05 (M+H)+
Analysis for C23H19CIFN5O2S- 1.7 H2O
Calcd: C, 53.69; H, 4.39; N, 13.61.
Found: C, 53.47; H, 4.11 ; N, 13.39.
Reference Example 20
4-((3-Chloro-4-F(1 -methyl-1 H-imidazol-2-yl)sulfanyl]phenyl)amino)-7-fluoro-6- methoxy-3-quinolinecarbonitrile
Following the procedure of Reference Example 19, a mixture of 4-chloro-7-fluoro-6- methoxy-3-quinolinecarbonitrile (2.30 g , 9.72 mmol), 3-chloro-4-[(1 -methyl-1 H- imidzazol-2-yl)thio]-benzamide (US4973599) (2.56 g, 10.6 mmol) and pyridine hydrochloride (1.2 g, 10.4 mmol) provides 3.00 g of 4-({3-chloro-4-[(1 -methyl-1 H- imidazol-2-yl)sulfanyl]phenyl}amino)-7-fluoro-6-methoxy-3-quinolinecarbonitrile, mp 290-294°C.
MS 440.20, 442.21 , 443.22 (M+H)+
Analysis for C2ιH15CIFN5OS- 0.4 H2O
Calcd: C, 56.41 ; H, 3.56; N, 15.67.
Found: C, 56.63; H, 3.25; N, 15.28.
Reference Example 21
4-r(2,4-Dichloro-5-methoxyphenyl)amino1-6-ethoxy-7-fluoro-3-quinolinecarbonitrile
Following the procedure of Reference Example 8, a mixture of 4-chloro-6-ethoxy-7- fluoro-3-quinolinecarbonitrile (197 mg, 0.78 mmol), 2,4-dichloro-5-methoxyaniline (220 mg, 1.14 mmol) and pyridine hydrochloride (120 mg, 1.04 mmol) provides, after flash column chromatography eluting with a gradient of dichloromethane to 1% methanol in dichloromethane, 183 mg of 4-[(2,4-dichIoro-5-methoxyphenyl)amino]-6- ethoxy-7-f luoro-3-quinolinecarbonitrile, mp 184-186°C.
MS 406.0 (M+H)
Analysis for C19H14CI2FN3O2- 0.5 H2O
Calcd: C, 54.96; H, 3.64; N, 10.12.
Found: C, 54.99; H, 3.59; N, 10.05.
Reference Example 22
4-r(2.4-Dichloro-5-methoxyphenyl)amino1-7-fluoro-6-(2-methoxyethoxy)-3- quinolinecarbonitrile
A mixture of 4-chloro-7-fluoro-6-(2-methoxyethoxy)-3-quinolinecarbonitrile (1.00 g, 3.59 mmol), 2,4-dichloro-5-methoxyaniline (727 mg, 3.77 mmol) and pyridine hydrochloride (620 mg, 5.34 mmol) in 18 mL of 2-ethoxyethanol is heated at 100- 105°C for 2 hours. The reaction mixture is cooled to room temperature and then poured into ice cold saturated sodium bicarbonate. The solids are collected, washed with water and then treated with methanol and dichloromethane. The mixture is filtered and the filtrate is concentrated. The solid residue is slurried with hexane, and the solids are collected by filtration to provide 1.15 g of 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-fluoro-6-(2-methoxyethoxy)-3-quinolinecarbonitrile, mp 170- 172°C.
HRMS theory 436.06256; found 436.06093 (M+H)+
Analysis for C2oH16CI2FN3O3- 0.4 H2O
Calcd: C, 54.16; H, 3.81 ; N, 9.48.
Found: C, 53.90; H, 3.89; N, 9.36. Reference Example 23
6-Benzyloxy-4-hvdroxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile
Following the procedure used to prepare Reference Example 6, reaction of 6- benzyloxy-4-hydroxy-7-fluoro-3-quinolinecarbonitrile and 2-methoxyethanol provides 6-benzyloxy-4-hydroxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile in 86% yield, mp >250°C.
MS 351.2 (M+H)+
Reference Example 24
6-Benzyloxy-4-chloro-7-(2-methoxyethoxy)-3-quinolinecarbonitrile
Following the procedure used to prepare Reference Example 12, reaction of 6- benzyloxy-4-hydroxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile with phosphorous oxychloride provides 6-benzyIoxy-4-chloro-7-(2-methoxyethoxy)-3- quinolinecarbonitrile in 67% yield, mp 142-145°C.
MS 369.1 (M+H)+
Analysis for C20H17CIN2O3
Calcd: C, 65.13; H, 4.65; N, 7.60.
Found: C, 64.92; H, 4.90; N, 7.48.
Reference Example 25
4-Chloro-6-hvdroxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile
A mixture of 6-benzyloxy-4-chloro-7-(2-methoxyethoxy)-3-quinolinecarbonitrile (512 mg, 1.39 mmol) and 0.9 mL of thioanisole in 7.5 mL of trifluoroacetic acid is heated at reflux for 3 hours then concentrated in vacuo. The residue is treated with ice water and then basified to pH 9-10 by the addition of aqueous ammonium hydroxide. The resultant suspension is extracted with ethyl acetate. The organic layer is washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. Trituration with diethyl ether provides 302 mg of 4-chloro-6-hydroxy-7-(2- methoxyethoxy)- 3-quinolinecarbonitrile, mp 174-175°C.
MS 279.0 (M+H)+
Analysis for
Figure imgf000040_0001
0.8 H2O
Calcd: C, 53.27; H, 4.33; N, 9.56.
Found: C, 53.39; H, 4.36; N, 9.71.
Reference Example 26
6-Butoxy-4-chloro-7-(2-methoxyethoxy)-3-quinolinecarbonitrile
Following the procedure used to prepare Reference Example 14, reaction of 4- chloro-6-hydroxy-7-(2-methoxyethoxy)- 3-quinolinecarbonitrile with triphenyl phosphine, diethyl azodicarboxylate and n-butanol provides 6-butoxy-4-chloro-7-(2- methoxyethoxy)-3-quinolinecarbonitrile in 71% yield, mp 128-130°C.
MS 335.1 (M+H)+
Analysis for Cι7H19CIN2O3
Calcd: C, 60.99; H, 5.72; N, 8.37.
Found: C, 61.05; H, 5.82; N, 8.10.
Reference Example 27
4-Chloro-7-fluoro-6-(2-morpholin-4-ylethoxy)-3-quinolinecarbonitrile
Following the procedure used to prepare Reference Example 14, reaction of 4- chloro-7-fluoro-6-hydroxy-3-quinolinecarbonitrile with triphenyl phosphine, diethyl azodicarboxylate and 4-(2-hydroxyethyl)morpholine provides 4-chloro-7-fluoro-6-(2- morpholin-4-yIethoxy)-3-quinolinecarbonitrile in 57% yield. An analytical sample is obtained by preparative thin layer chromatography eluting with 1% methanol in ethyl acetate, mp 163-164°C. MS 336.1 (M+H)+
Analysis for C16H15CIFN3O2- 0.13 Ethyl acetate
Calcd: C, 57.15; H, 4.66; N, 12.10.
Found: C, 57.03; H, 4.60; N, 11.96.
Reference Example 28
4-r(2.4-Dichloro-5-methoxyphenyl)amino]-7-fluoro-6-(2-morpholin-4-ylethoxy)-3- quinolinecarbonitrile
Following the procedure of Reference Example 8, a mixture of 4-chloro-7-fluoro-6-(2- morpholin-4-ylethoxy)-3-quinolinecarbonitrile (136 mg, 0.41 mmol), 2,4-dichloro-5- methoxyaniline (90.5 mg, 0.47 mmol) and pyridine hydrochloride (95 mg, 0.82 mmol) provides, after preparative thin layer chromatography eluting with 7% methanol in dichloromethane, 58 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-7-fluoro-6-(2- morpholin-4-ylethoxy)-3-quinolinecarbonitrile, mp 166-168°C.
MS 488.9 (M-H)-
Analysis for C23H21CI2FN4O3
Calcd: C, 56.22; H, 4.31 ; N, 11.40.
Found: C, 55.91 ; H, 4.44; N, 11.10.
Reference Example 29
6-Methoxy-7-(4-methyl-piperazin-1-yl)-4-oxo-1 ,4-dihydroquinoline-3-carbonitrile
A mixture of 200 mg (0.92 mmol) of 7-fluoro-6-methoxy-4-oxo-1 ,4-dihydroquinoline-3- carbonitrile (Reference Example 24) and 551 mg (5.50 mmol) of N-methylpiperazine in 1 mL of 1 -methyl-2-pyrrolidinone is heated at 90°C for 8 hours, then at 105°C for a further 16 hours. The solvents are removed in vacuo. To the resulting oily residue was added 2 mL of water and 5 mL of methanol. The solvents are again removed in vacuo. The crude product is purified by silica gel chromatography utilizing a gradient of methylene chloride/methanol (9:1 to 4:1) to yield 152 mg of 6-methoxy-7-(4- methyl-piperazin-1-yl)-4-oxo-1 ,4-dihydroquino!ine-3-carbonitriIe as a yellow solid, dec. > 235°C.
1 HNMR (DMSO-d6): δ 2.33 (s, 3H), 3.13 (broad s, 4H), 3.32 (broad s, 4H), 3.89 (s, 3H), 6.98 (s, 1 H), 7.43 (s, 1 H), 8.55 (s, 1 H), 12.43 (broad s, 1 H).
MS (ES, negative ion mode): m/z calcd for C16H18N4O2: 298.1 , found: 297.2 (M-H)".
Reference Example 30
Ethyl 2-{f(1 E)-(dimethylamino)methylidene1amino)-4-fluorobenzoate
A suspension of 2-amino-4-fluorobenzoic acid (10.2 g, 65.8 mmol) and dimethylformamide diethylacetal (58 mL) is heated at reflux for 6 h. The solution is cooled to room temperature and concentrated in vacuo. The dark oil is passed through a pad of hydrous magnesium silicate eluting with methylene chloride to provide 17.16 g of ethyl 2-{[(1 E)-(dimethylamino)methylidene]amino}-4- fluorobenzoate as a red oil.
MS 239.1 (M+H)+
Analysis for C12H15FN2O2- 0.20 H2O
Calcd: C, 59.59; H, 6.42; N, 11.58.
Found: C, 59.84; H, 6.25; N, 11.29.
Reference Example 31
7-Fluoro-4-hvdroxyquinoline-3-carbonitrile
To a solution of 2.5 M n-butyl lithium in tetrahydrofuran (53.6 mL, 134 mmol) in 54 mL of tetrahydrofuran at -78°C is added dropwise a solution of acetonitrile (7.1 mL, 136 mmol) in 100 mL of tetrahydrofuran. After stirring at -78°C for 10 min, a solution of ethyl 2-{[(1 E)-(dimethylamino)methylidene]amino}-4-fluorobenzoate (14.5 g, 60.9 mmol) in 100 mL of tetrahydrofuran is added over a period of 1.5 h. After stirring at -78°C for 2 h, the reaction temperature is slowly allowed to warm to -10°C. The mixture is then cooled to -78°C and acetic acid (18.3 g, 305 mmol) is added dropwise. The reaction mixture is allowed to warm to room temperature and stirred for 3 days. The precipitate is collected by filtration washing with tetrahydrofuran, water, diethyl ether, ethyl acetate and then additional diethyl ether to give 7.95 g of 7-fluoro-4-hydroxyquinoline-3-carbonitrile as an off-white solid, mp >250°C.
MS 187.0 (M-H)-
Analysis for C10H5FN2O- 0.20 H2O
Calcd: C, 62.63; H, 2.84; N, 14.61.
Found: C, 62.55; H, 2.71 ; N, 14.29.
Reference Example 32
4-Chloro-7-fluoroquinoline-3-carbonitrile
A mixture of 7-fluoro-4-hydroxyquinoline-3-carbonitrile (2.02 g, 10.7 mmol) and a few drops of N, N-dimethylformamide in 16.0 mL of thionyl chloride is heated at reflux for 1.5 h. The reaction mixture was concentrated in vacuo and toluene (20 mL) is added and the mixture is again concentrated in vacuo to provide 2.18 g of 4-chloro-7- fluoroquinoline-3-carbonitrile as a yellow solid, mp 163-165°C.
MS 207.0 (M+H)+
Reference Example 33
4-l"(2.4-Dichloro-5-methoxyphenyl)aminol-7-fluoro-3-quinolinecarbonitrile
Following the procedure of Reference Example 8, a mixture of 4-chloro-7-fluoro-3- quinolinecarbonitrile (2.10 g, 10.2 mmol), 2,4-dichloro-5-methoxyaniline (2.15 g, 11.2 mmol) and pyridine hydrochloride (1.18 g, 10.2 mmol) provides 1.78 g of 4-[(2,4- dichloro-5-methoxyphenyl)amino]-7-fluoro-3-quinolinecarbonitrile, mp 199-201 °C.
MS 360.0 (M-H)- Analysis for C17H10CI2FN3O- 0.4 H2O
Calcd: C, 55.28; H, 2.95; N, 11.38.
Found: C, 55.45; H, 2.98; N, 11.13.
Reference Example 34
7-(2-Methoxyethoxy)-4-oxo-1 ,4-dihvdroquinoline-3-carbonitrile
A mixture of sodium hydride (500 mg, 12.5 mmol) and 7-fluoro-4-hydroxyquinoline-3- carbonitrile (1.30 g, 6.9 mmol) in 2-methoxyethanol (30 mL) is heated at reflux overnight. Additional sodium hydride (250 mg, 6.25 mmol) is added and the reaction mixture is heated at reflux overnight. Additional sodium hydride (250 mg, 6.25 mmol) is added and the reaction mixture is heated at reflux for 8 hours. The reaction mixture is cooled to room temperature and partitioned between ethyl acetate and saturated sodium bicarbonate. The basic layer is acidified with aqueous HCI and the resultant solid is collected by filtration to provide 1.05 g of 7-(2-methoxyethoxy)-4- oxo-1 ,4-dihydroquinoline-3-carbonitrile as a white solid, mp >250°C.
MS 243.1 (M-H)-
Analysis for C13H 2N2O3 - 0.25H2O
Calcd: C, 62.77; H, 5.07; N, 11.26.
Found: C, 62.53; H, 4.68; N, 11.22.
Reference Example 35
4-Chloro-7-(2-methoxyethoxy)quinoline-3-carbonitrile
Following the procedure of Reference Example 32, 7-(2-methoxyethoxy)-4-oxo-1 ,4- dihydroquinoline-3-carbonitrile (800 mg, 3.28 mmol), thionyl chloride and a catalytic amount of N, N-dimethylformamide provides 748 mg of 4-chloro-7-(2- methoxyethoxy)quinoline-3-carbonitrile as an off-white solid solid, mp 143-145°C.
MS 263.2 (M+H)+ Reference Example 36
4-Chloro-6-methoxy-7-(4-methylpiperazin-1-yl)-quinoline-3-carbonitrile
A reaction mixture of 0.3 g (1.01 mmol) of 6-methoxy-7-(4-methyl-piperazin-1-yl)-4- oxo-1 ,4-dihydroquinoline-3-carbonitrile in 5 mL of phosphorus oxychloride is heated at 105°C for 45 minutes. After cooling, the mixture is concentrated to dryness in vacuo to give a brown solid. To this is added 5 mL toluene, and the solution is concentrated to dryness again. Dropwise, an ice-cooled saturated aqueous sodium carbonate solution is added to the residue. This mixture is extracted with 5 X 25 mL of a 95:5 mixture of methylene chloride/methanol. The organic layer is dried over magnesium sulfate. The magnesium sulfate is removed by filtration, and solvent is removed in vacuo to provide 0.255 g of 4-chloro-6-methoxy-7-(4-methylpiperazin-1- yl)-quinoline-3-carbonitrile as a yellow solid, mp 177-179°C.
MS (ES, positive ion mode): m/z calcd for C16H17CIN4O: 316.1 , found: 317.0 (M+H)+.
Analysis for C16H17CIN4O-0.1 H2O
Calcd: C, 60.32; H, 5.36; N, 17.59.
Found: C, 60.00; H, 5.35; N, 17.82.
The following Reference Examples 37-41 are obtained analogously by the method of Reference Example 8 and the corresponding substituted aniline.
Reference Example 37
4-[(2,4-Dichorophenyl)amino]-7-fluoro-6-methoχyquinoline-3-carbonitrile
MP 226-229°C; Mass Spec. 362.0 (ES+)
Reference Example 38
4-r(2.4-Dimethyl-5-methoxyphenyl)amino1-7-fluoro-6-methoχyquinoline-3-carbonitrile
MP 152-153°C; Mass Spec. 350.0 (ES+) Reference Example 39
4-f(2-Chloro-5-methoxyphenyl)amino]-7-fluoro-6-methoxyquinoline-3-carbonitrile
MP 237°C dec; Mass Spec. 356.0 (ES -)
Reference Example 40
7-Fluoro-6-methoxy-4-f(5-methoxy-2-methylphenyl)amino]-quinoline-3-carbonitrile
MP 169-171 °C; Mass Spec. 338.0 (ES +)
Reference Example 41
4-r(2.4-Dimethylphenyl)amino]-7-fluoro-6-methoxyquinoline-3-carbonitrile
MP 184-185°C; Mass Spec. 320.1 (ES -)
Reference Example 42
4-Chloro-6-methoxy-7-F(1 -methylpiperidin-4-yl)methoxy1quinoline-3-carbonitrile
A mixture of 7-fluoro-6-methoxy-4-oxo-1 ,4-dihydro-3-quinolinecarbonitrile (1.5 g, 6.9 mmol) and (1-methylpiperidin-4-yl)-methanol (1.8 g, 13.7 mmol) (WO 200471212) and a 60% dispersion in mineral oil of sodium hydride (0.8 g, 34.4 mmol) is heated at 110 °C for 2 hours. The reaction mixture is quenched with methanol, concentrated, and azeotroped with toluene to give 2.25 g of a brown solid. A mixture of this solid and phosphorous oxychloride (15 mL, 159 mmol) is heated at reflux for 30 minutes then concentrated in vacuo. The residue is partitioned between aqueous sodium bicarbonate and methylene chloride. The organic layer is dried over sodium sulfate, filtered and concentrated on to silica gel. Purification by column chromatography eluting with a gradient of 1 :9 methanol : methylene chloride to 0.05:1 :5 triethylamine : methanol : methylene chloride provided 1.6 g of 4-chloro-6-methoxy-7-[(1- methylpiperidin-4-yl)methoxy]quinoline-3-carbonithle, mp 166-168 °C.
MS 346 (M+H)+ Analysis for C18H20CIN3O2 -1 HCI + 0.5 H2O
Calcd: C, 54.72; H, 5.54; N 10.50.
Found: C, 54.72; H, 6.07; N 10.05.
Example 1
7-(2-Butvnyloxy)-4-f(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-3- quinolinecarbonitrile
A mixture of 2-butyn-1-oI (2.02 g, 28.8 mmol) and sodium (65 mg, 1.53 mmol) is heated at 120°C for 20 minutes. 4-[2,4-Dichloro-5-methoxyphenyl)amino]-7-f luoro-6- methoxy-3-quinolinecarbonitrile (150 mg, 0.38 mmol) is added and the reaction mixture is heated at 120°C overnight, then cooled to room temperature. The reaction mixture is added to water and acidified with acetic acid. The solids are collected by filtration and purified by flash column chromatography, eluting with a gradient of 3 : 7 ethyl acetate : hexane to 1 : 1 ethyl acetate: hexane, to provide 116 mg of 7-(2- butynyloxy)-4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-3- quinolinecarbonitrile, mp 193-197°C.
MS 442.1 (M+H)+
Analysis for C22H17CI2N303
Calcd: C, 59.74; H, 3.87; N, 9.50.
Found: C, 59.65; H, 3.75; N, 9.30.
Example 2
4-r(2,4-Dichloro-5-methoxyphenyl)amino]-7-(3-dimethylamino-2.2-dimethylpropoxy)- 6-methoxy-3-quinolinecarbonitrile
A mixture of sodium (48 mg, 2.1 mmol) in 2 mL of 3-dimethylamino-2,2- dimethylpropanol is heated at 100°C for 20 minutes. 4-(2,4-Dichloro-5- methoxyphenyl)amino]-7-fluoro-6-methoxy-3-quinolinecarbonitrile (200 mg, 0.51 mmol) is added and the reaction mixture is heated at 10O°C for 7 hours, then cooled to room temperature. The reaction mixture is partitioned between saturated sodium bicarbonate and ethyl acetate. The organic layer is washed with water, dried over sodium sulfate, filtered and concentrated in vacuo. The residue is purified by flash column chromatography eluting with 1 : 1 hexane : ethyl acetate to provide 58 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-7(3-dimethylamino-2,2-dimethylpropoxy)-6- methoxy-3-quinolinecarbonitrile, mp 178-180°C.
HRMS theory 503.16113; found 503.16112 (M+H)+
Analysis for C25H28CI2N4O3-1.2 H2O
Calcd: C, 57.19; H, 5.84; N, 10.67.
Found: C, 57.27; H, 6.19; N, 10.49.
Example 3
4-|"(2.4-Dichloro-5-methoxyphenyl)amino1-7-[3-(1.1 -dioxido-4- thiomorpholinyl)propoxy1-6-methoxy-3-quinolinecarbonitrile
A mixture of sodium (48 mg, 2.1 mmol) in 2 mL of 3-(1 ,1-dioxothiomorpholinyl)-1- propanol (WO 20047212) is heated at 100°C for 1 hour. 4-[(2,4-Dichloro-5- methoxyphenyl)amino]-7-fluoro-6-methoxy-3-quinolinecarbonitrile (200 mg, 0.51 mmol) is added and the reaction mixture is heated at 100°C for 4 hours, then cooled to room temperature. The reaction mixture is poured into saturated sodium bicarbonate and the solids are collected by filtration. The residue is purified by flash column chromatography eluting with 5% methanol in dichloromethane to
provide 88 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-7-[3-(1 ,1-dioxido-4- thiomorpholinyl)propoxy]-6-methoxy-3-quinolinecarbonitrile, mp 118-120°C.
HRMS theory 565.10735; found 565.10674 (M+H)+
Analysis for C25H26CI2N4O5S-1.1 H2O
Calcd: C, 51.30; H, 4.86; N, 9.57. Found: C, 51.11 ; H, 4.70; N, 9.26.
Example 4
4-r(214-Dichloro-5-methoxyphenvDamino1-6-methoxy-7-{2-r2-(1- piperazinyl)ethoxy,ethoxy)-3-quinolinecarbonitrile
A mixture of sodium (50 mg, 2.2 mmol) in 1 mL of 2-[2-(1-piperazinyl)ethoxy]ethanol is heated at 120°C for 2 hours. 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-fluoro-6- methoxy-3-quinolinecarbonitrile (150 mg, 0.38 mmol) is added and the reaction mixture is heated at 140-145°C for 2 hours, then cooled to room temperature. The reaction mixture is partitioned between saturated sodium bicarbonate and ethyl acetate. The organic layer is dried over magnesium sulfate, filtered and concentrated in vacuo. The residue is purified by flash column chromatography eluting with a gradient of 3% methanol in dichloromethane to 1% ammonium hydroxide and 30% methanol in dichloromethane followed by recrystallization from acetone and hexane to provide 124 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]- 6-methoxy-7-{2-[2-(1-piperazinyl)-ethoxy]ethoxy)-3-quinolinecarbonitrile, mp 88-90°C.
MS 273.4, 274.2
Analysis for C26H29CI2N5O4-1.5 H2O - 0.2 acetone
Calcd: C, 54.60; H, 5.70; N, 11.97.
Found: C, 54.68; H, 5.75; N, 11.76.
Example 5
4-f(2,4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-(2-thienylmethoxy)-3- quinolinecarbonitrile
To a mixture of sodium hydride (37 mg, 1.54 mmol) in 3 mL of dimethylsulfoxide is added 2-thiophenemethanol (48 mg, 0.42 mmol). The solution is stirred at room temperature for 45 minutes. 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-fluoro-6- methoxy-3-quinolinecarbonitrile (150 mg, 0.38 mmol) is added and the reaction mixture is heated at 100°C overnight, then cooled to room temperature. The reaction mixture is poured into saturated sodium bicarbonate and the solids are collected by filtration. Purification by flash column chromatography eluting with 1 : 1 hexane : ethyl acetate provides 61 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy- 7-(2-thienylmethoxy)-3-quinolinecarbonitrile, mp 194-196°C.
MS 485.9, 488.0 (M+H)+
Analysis for C23H17CI2N3O3S
Calcd: C, 56.80; H, 3.52; N, 8.64.
Found: C, 56.71 ; H, 3.74; N, 8.46.
Example 6
7-Benzyloxy-4-r(2,4-dichloro-5-methoxyphenvDamino1-6-methoxy-3- quinolinecarbonitrile
To a mixture of sodium hydride (122 mg, 3.04 mmol) in 6 mL of dimethylsulfoxide is added benzyl alcohol (91 mg, 0.84 mmol). The solution is stirred at room temperature for 40 minutes. 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-fluoro-6- methoxy-3-quinolinecarbonitrile (300 mg, 0.76 mmol) is added and the reaction mixture is heated at 100°C for 3 hours then cooled to room temperature and allowed to stir overnight. The reaction mixture is poured into saturated sodium bicarbonate and the solids are collected by filtration. Purification by flash column chromatography eluting with 10% ethyl acetate in dichloromethane provides 267 mg of 7-benzyloxy-4- [(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-3-quinolinecarbonitrile, mp 198- 200°C.
HRMS theory 480.08763; found 480.08725 (M+H)+
Analysis for C25H19CI2N3O3
Calcd: C, 62.51 ; H, 3.99; N, 8.75.
Found: C, 62.31 ; H, 4.20; N, 8.70. Example 7
4-r.2,4-Dichloro-5-methoxyphenyl)amino - 7-ethylsulfanyl-6-methoχy-3- uinolinecarbonitrile
To a mixture of sodium hydride (82 mg, 2.04 mmol) in 6 mL of tetrahydrofuran is added ethanethiol (77 mg, 1.12 mmol) in 6 mL of tetrahydrofuran. The reaction mixture is stirred at room temperature for 2 hours. A solution of 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-fluoro-6-methoxy-3-quinolinecarbonitrile (200 mg, 0.51 mmol) in 7 mL of tetrahydrofuran is added via syringe and the reaction mixture is heated at 70°C for 5 hours, then cooled to room temperature. The reaction volume is reduced by concentration in vacuo and then partitioned between ethyl acetate and water. The aqueous layer is extracted with additional ethyl acetate and the organic layers are combined and washed with water. The organic layer is dried over magnesium sulfate, filtered and concentrated in vacuo. The residue is purified by flash column chromatography eluting with a gradient of 10% to 30% ethyl acetate in hexane to provide 154 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]- 7- ethylsulfanyl-6-methoxy-3-quinolinecarbonitrile, mp 212-214°C.
HRMS theory 434.04913; found 434.04989 (M+H)+
HRMS theory 867.09098; found 867.09317 (2M+H)+
Analysis for C25H19CI2N3O3 - 0.3 H2O
Calcd: C, 54.62; H, 4.03; N, 9.56.
Found: C, 54.32; H, 4.06; N, 9.50.
Example 8
4-f(2.4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-phenylsulfanyl-3- quinolinecarbonitrile
A mixture of sodium thiophenoxide (181 mg, 1.37 mmol) and 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-fluoro-6-methoxy-3-quinolinecarbonitrile (100 mg, 0.27 mmol) in 3 mL of tetrahydrofuran is heated at reflux overnight. N-methylpyrrolidone (2 mL) is added and the reaction mixture is heated at 120°C for 1 hour then at 140°C for for 45 min. An additional 100 mg of sodium thiophenol is added and the reaction mixture is heated at 140°C for 3 hours. The reaction mixture is partitioned between ethyl acetate and water. The organic layer is dried over sodium sulfate, filtered and concentrated in vacuo. The residue is purified by flash column chromatography eluting with a 1 : 4 ethyl acetate: hexane to provide 36 mg of 4-[(2,4-dichloro-5- methoxyphenyl)amino]- 6-methoxy-7-phenylsulfanyl-3-quinolinecarbonitrile, mp 220- 222°C.
MS 481.7, 483.7 (M+H)+
Analysis for C24H17CI2N3O2S
Calcd: C, 54.62; H, 4.03; N, 9.56.
Found: C, 54.32; H, 4.06; N, 9.50.
Example 9
4-Cvclopentylamino-6-methoxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile
A mixture of 4-cyclopentylamino-7-fluoro-6-methoxy-3-quinolinecarbonitrile (150 mg, 0.53 mmol) and sodium hydride (53 mg, 2.21 mmol) in 1.6 mL of 2-methoxyethanol is heated at reflux for 30 minutes, then cooled to room temperature. The reaction mixture is partitioned between aqueous sodium bicarbonate and ethyl acetate. The organic phase is dried over sodium sulfate, filtered and concentrated in vacuo. Purification by preparative thin layer chromatography, eluting with 5% methanol in dichloromethane, followed by thturation with methanol and diethyl ether, provides 95 mg of 4-cyclopentylamino-6-methoxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile, mp 87-90°C.
MS 342.23 (M+H)+
Analysis for Cι9H23N3O3- 0.20 H2O
Calcd: C, 65.12; H, 6.90; N, 11.99. Found: C, 64.88; H, 6.88; N, 12.13.
Example 10
4-Butylamino-6-methoxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile
A mixture of 4-butylamino-7-fluoro-6-methoxy-3-quinolinecarbonitrile (150 mg, 0.55 mmol) and sodium hydride (55 mg, 2.29 mmol) in 1.7 mL of 2-methoxyethanol is heated at reflux for 30 minutes then cooled to room temperature. The reaction mixture is partitioned between aqueous sodium bicarbonate and ethyl acetate. The organic phase is dried over sodium sulfate, filtered and concentrated in vacuo. Purification by preparative thin layer chromatography, eluting with 5% methanol in dichloromethane, followed by trituration with ethyl acetate, provides 135 mg of 4- butylamino-6-methoxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile, mp 99-102°C.
MS 330.24 (M+H)+
1 H NMR (DMSO-d6) δ 0.94 (t, 3H), 1.42 (m, 2H), 1.70 (m, 2H), 3.32 (s, 3H), 3.33 (s, 3H), 3.70-3.78 (m, 4H), 4.23 (m, 2H), 7.23 (s, 1 H), 7.62 (s, 1 H), 7.85 (t, 1 H), 8.31 (s, 1 H).
Example 11
7-Benzylthio-4-r.2,4-dichloro-5-methoxyphenyl)amino1-6-methoxy-3- quinolinecarbonitrile
A mixture of sodium hydride (169 mg, 4.2 mmol), benzyl mercaptan (145 mg, 1.2 mmol) and 4-[(2,4-dichloro-5-methoxyphenyl)amino]-7-fluoro-6-methoxy-3- quinolinecarbonitrile (250 mg, 0.64 mmol) in 1 mL of tetrahydrofuran is heated at 70°C for 1 hour, then stirred at room temperature overnight. Upon addition of 1 mL of dimethyl sulfoxide a solution is obtained. Additional amounts of sodium hydride and benzyl mercaptan are added and the reaction mixture is heated at 100°C. The reaction mixture is partitioned between ethyl acetate and water. The organic layer is dried over sodium sulfate, filtered and concentrated in vacuo. The residue is purified by preparative thin layer chromatography, eluting with 1 : 2 ethyl acetate : hexane to provide 150 mg of 7-benzylthio-4-[(2,4-dichloro-5-methoxyphenyl)amino]- 6-methoxy- 3-quinolinecarbonitrile, mp 123-125°C.
MS 494.03 (M-H)-
Analysis for C25H19CI2N3O2S - 0.5 H2O
Calcd: C, 59.40; H, 3.99; N, 8.31.
Found: C, 59.45; H, 3.98; N, 8.12.
Example 12
4-r(2,4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-(pyridin-4-yloxy)-3- quinolinecarbonitrile
A mixture of sodium hydride (128 mg, 3.2 mmol) and 4-hydroxypyridine (750 mg, 7.89 mmol) in 5 mL of N, N'-dimethylformamide is heated at 100°C for 1 hour. 4- [(2,4-Dichloro-5-methoxyphenyl)amino]-7-fluoro-6-methoxy-3-quinolinecarbonitrile (200 mg, 0.51 mmol) is added and the reaction mixture is heated at 130°C for 2 hours. An additional 21 mg of sodium hydride is added and the reaction mixture is heated at 130°C for an additional 30 minutes. The reaction mixture is partitioned between ethyl acetate and water. The organic layer is dried over sodium sulfate, filtered and concentrated in vacuo. The residue is purified by heating with methanol and dichloromethane to provide 130 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]- 6-methoxy-7-(pyridin-4-yloxy)-3-quinolinecarbonitrile, mp 267-269°C.
MS 467.11 (M+H)+
Analysis for C23H16CI2N O3 - 0.2 ethyl acetate
Calcd: C, 58.89; H, 3.33; N, 11.55.
Found: C, 58.84; H, 3.41; N, 11.60. Example 13
4-r(2,4-Dichloro-5-methoxyphenyl)amino1- 6-methoxy-7-r2-(1-methylpiperidin-4- yl)ethoxy1-3-quinolinecarbonitrile
A mixture of sodium hydride (128 mg, 3.2 mmol) and 1 -methyl-4-piperidineethanol (180 mg, 1.25 mmol) [ EP 0581538] in 5 mL of N, N'-dimethylformamide is heated at 110°C for 1 hour. 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-fluoro-6-methoxy-3- quinolinecarbonitrile (200 mg, 0.51 mmol) is added and the reaction mixture is heated at 135°C for 5 hours. Over the next 4 hours an additional 128 mg of sodium hydride is added to the reaction mixture at 130°C. The reaction mixture is partitioned between ethyl acetate and water. The organic layer is dried over sodium sulfate, filtered and concentrated in vacuo. The residue is purified by preparative thin layer chromatography, eluting with 20% methanol in dichloromethane to provide 105 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]- 6-methoxy-7-[(2-(1-methylpiperidin-4- yl)ethoxy]-3-quinolinecarbonitrile, mp 190-191 °C.
MS 515.19 (M+H)+
Analysis for C26H28CI2N4O3 - 1.0 H2O
Calcd: C, 58.53; H, 5.67; N, 10.50.
Found: C, 58.65; H, 5.57; N, 10.34.
Example 14
4-r(2,4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-[2-methoxyethoxy]-3- quinolinecarbonitrile
A mixture of sodium (118 mg, 5.11 mmol) and 2-methoxyethanol (5 mL) is heated at 120-130°C for 3 hours. 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-fluoro-6- methoxy-3-quinolinecarbonitrile (500 mg, 1.28 mmol) is added and the reaction mixture is heated at 120-125°C for 1 hour. The temperature of the reaction mixture is increased to 140-150°C and this temperature is maintained for 2.5 hours. The reaction mixture is cooled to room temperature and diluted with ice cold aqueous sodium bicarbonate. The solid is collected by filtration washing with water and hexane. Purification by flash column chromatography, eluting with 2% methanol in dichloromethane provides 550 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]- 6- methoxy-7-[2-methoxyethoxy]-3-quinolinecarbonitrile, mp 210-212°C.
MS 448.2(M+H)+
Analysis for C21H19CI2N3O4
Calcd: C, 56.26; H, 4.27; N, 9.37.
Found: C, 56.02; H,4.16; N, 9.12.
Example 15
4-[(2,4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-r2-(1-methyl-3- piperidinyl)methoxyl-3-quinolinecarbonitrile
To a solution of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-7-fluoro-6-methoxy-3- quinolinecarbonitrile (250 mg, 0.64 mmol) and 1-methylpiperidine-3-methanol (165 mg, 1.28 mmol) in 6 mL of N, N'-dimethylformamide at 135°C is added sodium hydride (92 mg, 3.8 mmol) in portions. After 1 hour an additional 92 mg of sodium hydride is added to the reaction mixture at 135°C. After 30 minutes the reaction mixture is poured into saturated sodium bicarbonate. After stirring for 15 minutes the solid is collected by filtration. The residue is purified by flash column chromatography, eluting with a gradient of 5% methanol in dichloromethane to 1% ammonium hydroxide in 10% methanol in dichloromethane. After an additional purification by flash column chromatography eluting with a gradient of 5% methanol in dichloromethane to 25% methanol in dichloromethane, 4-[(2,4-dichloro-5- methoxyphenyl)amino]- 6-methoxy-7-[(2-(1-methyl-3-piperidinyl)methoxy]-3- quinolinecarbonitrile is obtained, mp 176-178°C.
MS 499.09 (M-H)-
Analysis for C25H26CI2N4O3 - 0.3 H2O
Calcd: C, 59.25; H, 5.29; N, 11.06. Found: C, 59.18; H, 5.20; N, 10.91.
Example 16
4-r(2.4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-r2-(1-methyl-4- piperidinyl)methoxy1-3-quinolinecarbonitrile
To a solution of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-7-fluoro-6-methoxy-3- quinolinecarbonitrile (600 mg, 1.53 mmol) and 1-methylpiperidine-4-methanol (395 mg, 3.06 mmol) (WO 20047212) in 10 mL of N, N'-dimethylformamide at 135°C is added sodium hydride (362 mg, 9.06 mmol) in portions. After 45 minutes the reaction mixture is poured into saturated sodium bicarbonate. After stirring for 15 minutes the solid is collected by filtration. The residue is purified by flash column chromatography, eluting with a gradient of 5% methanol in dichloromethane to 25% methanol in dichloromethane. Trituation with diethyl ether provides 396 mg of 4- [(2,4-dichloro-5-methoxyphenyl)amino]- 6-methoxy-7-[(2-(1-methyl-4- piperidinyl)methoxy]-3-quinolinecarbonitrile, mp 200-202°C.
MS 501.3 (M+H)+
Analysis for C25H26CI2N4O3 - 0.8H2O
Calcd: C, 58.21 ; H, 5.39; N, 10.86.
Found: C, 58.19; H, 5.23; N, 10.67.
Example 17
6-Methoxy-7-[2-methoxyethoxy1-4-r(3A5-trimethoxyphenyl)amino1-3- quinolinecarbonitrile
A mixture of sodium hydride (80 mg, 2.0 mmol) and 6-methoxy-7-fluoro-4-[(3,4,5-tri- methoxyphenyl)amino]-3-quinolinecarbonithle (203 mg, 0.53 mmol) in 2- methoxyethanol (6 mL) is heated at reflux for 2 hours. Additional sodium hydride (80 mg, 2.0 mmol) is added and the reaction mixture is heated at reflux for 4 hours. The reaction mixture is cooled to room temperature and partitioned between ethyl acetate and saturated sodium bicarbonate. The organic layer is dried over magnesium sulfate, filtered and concentrated in vacuo. Trituration of the residue with ethyl acetate and diethyl ether provides 178 mg of 6-methoxy-7-[2-methoxyethoxy]- 4- [(3,4,5-trimethoxyphenyl)amino]-3-quinolinecarbonitrile, mp 188-190°C.
MS 440.22 (M+H)+
Analysis for
Figure imgf000058_0001
- 1.0 H2O
Calcd: C, 60.38; H, 5.95; N, 9.19.
Found: C, 60.44; H, 5.98; N, 9.15.
Example 18
6-Methoxy-7-r(1-methylpiperidine-4-yl)methoxy]-4-r(3,4.5-trimethoxyphenyl)amino1-3- quinolinecarbonitrile
Following the procedure used to prepare Example 15, 6-methoxy-7-fluoro-4-[(3,4,5- tri-methoxyphenyl)amino]-3-quinolinecarbonitrile (230 mg, 0.60 mmol) and 1 - methylpiperidine-3-methanol (200 mg, 1.55 mmol) provides, after flash column chromatography eluting with a gradient of 3 : 1 ethyl acetate : methanol to 2% aqueous ammonium hydroxide in 3 : 1 ethyl acetate : methanol, 143 mg of 6- methoxy-7-[(1 -methylpiperidine-4-yl)methoxy]]-4-[(3,4,5-thmethoxyphenyl)amino]-3- quinolinecarbonitrile, mp softens at 65°C.
MS 493.26 (M+H)+
Analysis for C27H32N O5 - 2.5 H2O
Calcd: C, 60.32; H, 6.94; N, 10.42.
Found: C, 60.28; H, 6.71 ; N, 10.35. Example 19
4-((3-Chloro-4-r(1-methyl-1 H-imidazol-2-yl)sulfanvnphenyllamino)-6-methoχy-7-r2-(2- methoxy)ethoxy1-3-quinolinecarbonitrile
A mixture of sodium (78 mg, 3.4 mmol) in 2 mL of 2-(2-methoxyethoxy)ethanol is heated at 100°C for 1 hour. 4-({3-Chloro-4-[(1 -methyl-1 H-imidazol-2- yl)sulfanyl]phenyl}amino)-7-fluoro-6-methoxy-3-quinolinecarbonitrile (300 mg, 0.68 mmol) is added and the reaction mixture is heated at 140°C for 3.5 hours, then cooled to room temperature. The reaction mixture is poured into saturated sodium bicarbonate and the solids are collected by filtration, washing with water. Purification by flash column chromatography eluting with a gradient of 2% methanol in dichloromethane to 3% methanol in dichloromethane followed by recrystallization from acetone and hexane provides 262 mg of 4-({3-chloro-4-[(1 -methyl-1 H-imidazol- 2-yl)sulfanyl]phenyl}amino)-6-methoxy-7-[2-(2-methoxy)ethoxy]-3- quinolinecarbonitrile, mp 222-224°C.
MS 540.35, 542.39 (M+H)+
Analysis for C26H26CIN5O4S-0.5 H2O
Calcd: C, 56.87; H, 4.96; N, 12.76.
Found: C, 56.75; H, 4.78; N, 12.72.
Example 20
4-((3-Chloro-4-r(1-methyl-1 H-imidazol-2-yl)sulfanvnphenyl)amino)-7-r3- (dimethylamino)propoxy1-6-(2-methoxyethoxy)- 3-quinolinecarbonitrile
Following the procedure of Example 19, 4-({3-chloro-4-[(1 -methyl-1 H-imidazol-2- yl)sulfanyl]phenyl}amino)-7-fluoro-6-(2-methoxyethoxy)-3-quinolinecarbonitrile (300 mg, 0.62 mmol) and 2 mL of 3-dimethylamino-1 -propanol provides 115 mg of 4-({3- chloro-4-[(1 -methyl-1 H-imidazol-2-yl)sulfanyl]phenyl}amino)-7-[3-
(dimethylamino)propoxy]-6-(2-methoxyethoxy)-3-quinolinecarbonitrile, mp 194- 203°C. MS 567.31 (M+H)+, 284.16 (M+2H)2+
Analysis for C28H31ClN6O3S-1.4 H2O
Calcd: C, 56.77; H, 5.75; N, 14.19.
Found: C, 56.61 ; H, 5.35; N, 13.90.
Example 21
4-({3-Chloro-4-r(1 -methyl-1 H-imidazol-2-yl)sulfanyl]phenyl ,amino)-7-l'3-(4-ethyl-1 - piperazinyl)propoxy1-6-(2-methoxyethoxy)- 3-quinolinecarbonitrile
Following the procedure of Example 15, 4-({3-chloro-4-[(1 -methyl-1 H-imidazol-2- yl)sulfanyl]phenyl}amino)-7-fluoro-6-(2-methoxyethoxy)-3-quinolinecarbonitrile (300 mg, 0.62 mmol) and 1-ethyl-4-(3-hydroxypropyl)piperazine (540 mg, 3.1 mmol) provides 155 mg of 4-({3-chloro-4-[(1 -methyl-1 H-imidazol-2- yl)sulfanyl]phenyl}amino)-7-[3-(4-ethyl-1-piperazinyl)propoxy]-6-(2-methoxyethoxy)- 3-quinolinecarbonitrile, mp 188-190°C.
MS 318.68 (M+2H)+2
Analysis for C32H38CIN7O3S-1.0 H2O
Calcd: C, 58.74; H, 6.16; N, 14.99.
Found: C, 58.84; H, 5.91 ; N, 14.73.
Example 22
4-r(2,4-Dichloro-5-methoxyphenyl)amino1-6-,2-methoχyethoxy1-7-r(1- methylpiperidine-4-yl)methoxy]3-quinolinecarbonitrile
Following the procedure used to prepare Example 15, 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-fluoro-6-[2-methoxyethoxy]-3-quinolinecarbonitrile (300 mg, 0.69 mmol) and 1 -methylpiperidine-4-methanol (178 mg, 1.38 mmol) provides, after preparatory thin layer chromatography eluting with 20% methanol in ethyl acetate, 165 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-[2-methoxyethoxy]-7- [(1 -methylpiperidine-4-yl)methoxy]-3-quinolinecarbonitrile, mp 153-155°C.
MS 545.19 (M+H)+
Analysis for C27H30CI2N4O4 - 0.7 H2O
Calcd: C, 58.11 ; H, 5.67; N, 10.04.
Found: C, 58.04; H, 5.74; N, 9.99.
Example 23
4-r(2,4-Dichloro-5-methoxyphenyl)amino1-6-ethoxy-7-(2-methoxyethoxy)3- quinolinecarbonitrile
Following the procedure used to prepare Example 17, 4-[(2,4-dichloro-5- methoxyphenyl)amino]-6-ethoxy-7-fluoro-3-quinolinecarbonitrile (138 mg, 0.34 mmol) and 2-methoxyethanol provides 105 mg of 4-[(2,4-dichloro-5- methoxyphenyl)amino]-6-ethoxy-7-(2-methoxyethoxy)3-quinolinecarbonitrile, mp
215-217°C.
MS 462.1 (M+H)+
Analysis for C22H31CI2N3O4 - 0.3 H2O
Calcd: C, 56.49; H, 4.66; N, 8.99.
Found: C, 56.59; H, 4.64; N, 8.95.
Example 24
6-Butoxy-4-r(2,4-dichloro-5-methoxyphenyl)amino1-7-(2-methoxyethoxy)-3- quinolinecarbonitrile
A mixture of 6-butoxy-4-chloro-7-(2-methoxyethoxy)-3-quinolinecarbonitrile (184 mg, 0.55 mmol), 2,4-dichloro-5-methoxyaniline (127 mg, 0.66 mmol) and pyridine hydrochloride (76 mg, 0.66 mmol) in 5 mL of 2-ethoxyethanol is heated at 120°C for 7 hours. The reaction mixture is cooled to room temperature and concentrated in vacuo. Diethyl ether is added to the residue and the solids are collected and suspended in saturated aqueous sodium bicarbonate. After stirring for 1 hour the solids are collected by filtration and washed with water. Purification by preparatory thin layer chromatography, eluting with 7% methanol in dichloromethane provides 93 mg of 6-butoxy-4-[(2,4-dichloro-5-methoxyphenyl)amino]-7-(2-methoxyethoxy)-3- quinolinecarbonitrile, mp 166-167°C.
MS 488.0 (M-H)-
Analysis for C24H25CI2N3O4- 0.5 H2O
Calcd: C, 57.72; H, 5.25; N, 8.41.
Found: C, 57.67; H, 4.93; N, 8.49.
Example 25
4-r(2,4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-(tetrahvdro-2H-pyran-2- ylmethoxy)3-quinolinecarbonitrile
Following the procedure used to prepare Example 15, 4-[(2,4-dichloro-5- methoxyphenyl)amino]-6-ethoxy-7-fluoro-3-quinolinecarbonitrile (250 mg, 0.64 mmol) and tetrahydropyran-2-methanoI provides 177 mg of 4-[(2,4-dichloro-5- methoxyphenyl)amino]-6-methoxy-7-(tetrahydro-2H-pyran-2-ylmethoxy)-3- quinolinecarbonitrile, mp 193-196°C.
MS 485.9 (M-H)-
Analysis for C24H23CI2N3O4
Calcd: C, 59.03; H, 4.75; N, 8.60.
Found: C, 59.06; H, 4.84; N, 8.39. Example 26
4-r(2.4-Dichloro-5-methoxyphenyl)aminol-7-(2-methoxyethoxy)-6-(2-morpholin-4- ylethoxy)3-quinolinecarbonitrile
Following the procedure used to prepare Example 15, 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-fluoro-6-(2-morpholin-4-ylethoxy)-3-quinolinecarbonitrile (102 mg, 0.21 mmol) and 2-methoxyethanol provides 86 mg of 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-(2-methoxyethoxy)-6-(2-morpholin-4-ylethoxy)3- quinolinecarbonitrile, mp 158-159°C.
MS 544.9 (M-H)-
Analysis for C26H28CI2N4O5 - 1.3 H2O
Calcd: C, 54.70; H, 5.40; N, 9.81.
Found: C, 54.57; H, 5.24; N, 9.79.
Example 27
4-[3-Chloro-4-(1 -methyl-1 H-imidazol-2-ylsulfanyl)-phenylamino]-6-methoxy-7-(4- methylpiperazin-1 -yl)-quinoline-3-carbonitrile
A mixture of 200 mg (0.455 mmol) of 4-[3-chloro-4-(1 -methyl-1 H-imidazol-2- ylsulfanyl)-phenylamino]-7-fluoro-6-methoxyquinoline-3-carbonitrile (Reference
Example 20) and 273 mg (2.73 mmol) of N-methylpiperazine in 1 mL of 1 -methyl-2- pyrrolidinone was heated at 105°C for 16 hours. The solvents are removed in vacuo. A 10 mL portion of water is added to the residue, from which a tan solid precipitates out. The solid is filtered off and washed with water. After drying in vacuo, the solid is suspended in ethyl acetate and stirred for 1 hour. The solid is filtered off, washed with ethyl acetate and dried in vacuo to provide 0.175 g of 4-[3-chloro-4-(1 -methyl- 1 H-imidazol-2-ylsulfanyl)-phenylamino]-6-methoxy-7-(4-methylpiperazin-1-yI)- quinoline-3-carbonitrile as a yellow solid, mp 270-272°C. 1HNMR (DMSO-d6): δ 2.24(s, 3H), 3.19 (broad s, 4H), 3.32 (broad s, 4H), 3.60 (s, 3H), 3.92 (s, 3H), 6.58 (d, J = 6.3 Hz, 1 H), 7.10 (dd, J = 1.5 Hz, J = 6.6 Hz, 1 H), 7.15 (d, J = 0.9 Hz, 1H), 7.24 (s, 1 H), 7.37 (d, J = 1.8 Hz), 7.53 (d, J = 0.6 Hz), 7.60 (s, 1 H), 8.48 (s, 1 H), 9.52 (s, 1 H).
MS (ES, negative ion mode): m/z calcd for C26H26CIN7OS: 519.2, found: 518.3 (M-H)"
Analysis for C26H26CIN7OS -1.0 H2O
Calcd: C, 58.04; H, 5.25; N, 18.22
Found: C, 58.16; H, 4.94; N, 17.95.
Example 28
4-r(2,4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-{[3-(1-methylpiperidin-4- yl)propyl1amino|quinoline-3-carbonitrile
Following the procedure used to prepare Example 27, 250 mg (0.64 mmol) of 4-[(2,4- dichloro-5-methoxyphenyl)amino]-7-fluoro-6-methoxyquinoline-3-carbonitrile
is reacted with 600 mg (3.80 mmol) of 3-(1-methylpiperidin-4-yl)propylamine in 2 mL of 1 -methyl-2-pyrrolidinone at 105°C for 18 hours to yield 130 mg of 4-[(2,4-dichloro- 5-methoxyphenyl)amino]-6-methoxy-7-{[3-(1-methylpiperidin-4- yl)propyl]amino}quinoline-3-carbonithIe as a white solid, mp 122-124°C.
MS (ES, positive ion mode): m/z calcd for C27H31Cl2N5O: 573.2, found: 528.2 (M+H)+.
Analysis for C27H31CI2N5O
Calcd: C, 61.36; H, 5.91 ; N, 13.25.
Found: C, 60.96; H, 5.76; N, 12.90. Example 29
4-|'3-Chloro-4-(1 -methyl-1 H-imidazol-2-ylsulfanyl)-phenylamino]-7-{[3- (dimethyl)aminopropyπamino.-6-methoxyquinoline-3-carbonitrile
Following the procedure used to prepare Example 27, 150 mg (0.34 mmol) of 4-[3- chloro-4-(1 -methyl-1 H-imidazol-2-ylsulfanyl)-phenylamino]-7-f luoro-6- methoxyquinoline-3-carbonitrile is reacted with 209 mg (2.05 mmol) of N, N-dimethyl- 1 ,3-propanediamine in 1 mL of 1 -methyl-2-pyrrolidinone at 105°C for 16 hours to yield 99 mg of 4-[3-chloro-4-(1 -methyl-1 H-imidazol-2-ylsulfanyl)-phenylamino]-7-{[3- (dimethylamino)propyl]amino}-6-methoxyquinoline-3-carbonitrile as a tan solid, mp 198-200°C.
MS (ES, positive ion mode): m/z calcd for C26H28CIN7OS: 521.2, found: 522.4 (M+H)+.
Analysis for C26H28CIN7OS -0.75 H2O
Calcd: C, 58.31 ; H, 5.55; N, 18.31
Found: C, 58.00; H, 5.16; N, 17.93.
Example 30
4-r3-Chloro-4-(1-methyl-1 H-imidazol-2-ylsulfanyl)-phenylaminol-7-(r3- (dimethylamino)propyn-methylamino)-6-methoxyquinoline-3-carbonitrile
Following the procedure used to prepare Example 27, 150 mg (0.34 mmol) of 4-[3- chloro-4-(1 -methyl-1 H-imidazol-2-ylsulfanyl)-phenylamino]-7-fluoro-6- methoxyquinoline-3-carbonitrile is reacted with 238 mg (2.05 mmol) of N, N, N'- trimethyl-1 ,3-propanediamine in 1 mL of 1 -methyl-2-pyrrolidinone at 105°C for 16 hours to yield 121 mg of 4-[3-chloro-4-(1 -methyl-1 H-imidazol-2-ylsulfanyl)- phenylamino]-7-{[3-(dimethyl)aminopropyl]-methylamino}-6-methoxyquinoline-3- carbonitrile as a tan solid, mp 196-201 °C.
MS (ES, positive ion mode): m/z calcd for C27H30CIN7OS: 535.2, found: 536.1
(M+H)+. Analysis for C27H30CIN7OS -0.50 H2O
Calcd: C, 59.49; H, 5.73; N, 17.99
Found: C, 59.61 ; H, 5.59; N, 17.84.
Example 31
4-r(214-Dichloro-5-methoxyphenyl)amino1-7-l'3-(4-methyl)piperazin-1-yl)propoxy1-3- quinolinecarbonitrile
Following the procedure used to prepare Example 15, 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-fluoro-3-quinolinecarbonitrile (200 mg, 0.55 mmol) and 3- (4-methyl)piperazin-1-yl)propanol provided 71 mg of 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-[3-(4-methyl)piperazin-1-yl)propoxy]-3-quinolinecarbonitrile, mp 154-155°C.
MS 497.9 (M-H)-
Analysis for C25H27CI2N5O2 - 0.8 H2O
Calcd: C, 58.32; H, 5.60; N, 13.60.
Found: C, 58.32; H, 5.30; N, 13.28.
Example 32
4-r(2.4-Dichloro-5-methoxyphenyl)amino1-7-r(1-methylpiperidin-4-yl)methoxy1-3- quinolinecarbonitrile
Following the procedure used to prepare Example 15, 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-fluoro-3-quinolinecarbonitrile (200 mg, 0.55 mmol) and 1- methyl-1 -piperidine-4-methanol provides 75 mg of 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-[(1-methylpiperidin-4-yl)methoxy]-3-quinolinecarbonitrile, mp 191-193°C.
MS 468.8 (M-H)- Analysis for C24H24CI2N4O2 - 0.6 H2O
Calcd: C, 59.78; H, 5.27; N, 11.62.
Found: C, 59.87; H, 5.11 ; N, 11.70.
Example 33
4-r(2.4-Dichloro-5-methoxyphenyl)amino1-7-(2-methoxyethoxy)-3- quinolinecarbonitrile
Following the procedure used to prepare Example 15, 4-[(2,4-dichloro-5- methoxyphenyl)amino]-7-fluoro-3-quinolinecarbonitrile (300 mg, 0.83 mmol) and 2- (methoxy)ethanol provides 194 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-7-(2- methoxy)ethoxy]-3-quinolinecarbonitrile, mp 182-183°C.
MS 416.1 (M-H)-
Analysis for C20H17CI2N3O3
Calcd: C, 57.43; H, 4.10; N, 10.05.
Found: C, 57.36; H, 4.09; N, 9.89.
Example 34
4-r(2,4-Dichlorophenyl)amino]-7-(2-methoxyethoxy)-3-quinolinecarbonitrile
A mixture of 4-chloro-7-(2-methoxyethoxy)-3-quinolinecarbonitrile (262 mg, 1.0 mmol), 2,4-dichloroaniline (195 mg, 1.2 mmol) and pyridine hydrochloride (140 mg, 1.2 mmol) in 10 mL of 2-ethoxyethanol is heated at reflux for 30 minutes. The reaction mixture is cooled to room temperature partitioned between ethyl acetate and saturated sodium bicarbonate. The organic layer is washed with a 1 : 1 mixture of saturated sodium bicarbonate and 5 N sodium hydroxide. The organic layer is dried over magnesium sulfate, filtered and concentrated in vacuo. Purification by column chromatography, eluting with a gradient of 1 : 1 ethyl acetate : hexane to all ethyl acetate provides 103 mg of 4-[(2,4-dichlorophenyl)amino]-7-(2-methoxyethoxy)-3- quinolinecarbonitrile, mp 144-145°C.
MS 388.0 (M-H)-
Analysis for C19H15CI2N3O2
Calcd: C, 58.78; H, 3.89; N, 10.82.
Found: C, 58.86; H, 3.90; N, 10.76.
Example 35
6-Methoxy-7-(4-methylpiperazin-1-yl)-4-(4-phenoxyphenylamino)-quinoline-3- carbonitrile
A reaction mixture of 0.12 g (0.38 mmol) of 4-chloro-6-methoxy-7-(4-methylpiperazin- 1-yl)-quinoline-3-carbonitrile, 0.077 g (0.42 mmol) of 4-phenoxyaniline and 0.044 g (0.38 mmol) of pyridine hydrochloride in 2 ml of 2-ethoxyethanol is heated at 115°C for 45 minutes. After cooling, the mixture is filtered, washed with cold 2- ethoxyethanol, then ethyl acetate. After drying in vacuo, the solid is suspended in a saturated solution of sodium carbonate, stirred for 45 minutes and collected by filtration. The reaction product is washed with water and dried in vacuo, to provide 0.11 g of 6-methoxy-7-(4-methylpiperazin-1-yl)-4-(4-phenoxyphenylamino)-quinoline- 3-carbonitrile as a yellow solid, mp softens at 93 °C.
MS(ES, negative ion mode): m/z calcd for C28H27N5O2: 465.2, found: 464.2 (M-H)".
Analysis for C28H27N5O2-1.0 H2O
Calcd: C, 69.55; H, 6.04; N, 14.48.
Found: C, 69.68; H, 5.83; N, 14.40.
The following Examples 36-40 are obtained analogously by the method of Example 17 and the corresponding alcohol. Example 36
4-r(2.4-Dichorophenyl)amino1-6-methoxy-7-(2-methoxyethoxy)quinoline-3-carbonitrile
MP 170-171 °C; Mass spec. 415.9 (ES +)
Example 37
4-,(2,4-Dimethyl-5-methoxyphenyl)amino1-6-methoxy-7-(2-methoxyethoxy)quinoline- 3-carbonitrile
MP 143-145°C; Mass spec. 408.2 (ES +)
Example 38
4-r(2-Chloro-5-methoxyphenyl)amino1-6-methoxy-7-(2-methoxyethoxy)quinoline-3- carbonitrile
MP 179-181 °C; Mass spec. 412.2 (ES -)
Example 39
6-Methoxy-7-(2-methoxyethoxy)-4-r(5-methoxy-2-methylphenyl)amino1-quinoline-3- carbonitrile
MP 116-119°C; Mass spec.394.2 (ES +)
Example 40
4-r(2.4-Dimethylphenyl)amino1-6-methoxy-7-(2-methoxyethoxy)quinoline-3- carbonitrile
MP 107-109°C; Mass spec. 378.2 (ES +)
The following Examples 41 -52 are obtained analogously by the method of Example 16 and the corresponding alcohol. Example 41
4-r(2.4-Dichlorophenyl)amino1-6-methoxy-7-r(1-methylpiperidine-4- yl)methoxy1quinoline-3-carbonitrile
MP 224-225°C; Mass spec. 469.0 (ES -)
Example 42
4-r(2,4-Dimethyl-5-methoxyphenyl)amino1-6-methoxy-7-r(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile
MP 160-162°C; Mass spec 461.3 (ES +)
Example 43
6-Methoxy-4-[(5-methoxy-2-methylphenyl)amino1-7-|'(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile
MP >250°C; Mass spec. 445.2 (ES -)
Example 44
4-f(2-Chloro-5-methoxyphenyl)amino]-6-methoxy-7-[(1 -methylpiperidine-4- yl)methoxy1quinoline-3-carbonitrile
MP 106-108°C; Mass spec. 467.2 (ES +)
Example 45
4-[(2.4-Dimethylphenyl)amino1-6-methoxy-7-r(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile
MP 190-191 °C; Mass spec. 429.2 (ES - ) Example 46
4-f(2,4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-r3-(1-methylpiperidine-4- yl)propoxy1quinoline-3-carbonitrile
MP 144-145°C; Mass spec. 529.2 (ES +)
Example 47
4-r(2-Chloro-5-methoxyphenyl)amino1-6-methoxy-7-r3-(1-methylpiperidine-4- yl)propoxy,quinoline-3-carbonitrile
MP 117-120°C; Mass spec. 485.2 (ES +)
Example 48
6-Methoxy-4-r(5-methoxy-2-methylphenyl)amino1-7-F3-(1-methylpiperidine-4- yl)propoxy]quinoline-3-carbonitrile
MP 163-166°C; Mass spec. 475.3 (ES +)
Example 49
4-r(2.4-Dimethylphenyl)amino1-6-methoxy-7-r3(1-methylpiperidine-4- yl)propoxy,quinoline-3-carbonitrile
MP 159-162°C; Mass spec. 459.3 (ES +)
Example 50
4-r(2.4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-f3-(4-methyl-1- piperazinyl)propoxy1quinoline-3-carbonitrile
MP 125-128°C; High Resolution Mass Spec. :530.17274 calc'd: 530.17203 Example 51
4-f(2.4-Dichloro-5-methoxyphenyl)amino1-7-r(1-ethylpiperidine-4-yl)methoxy1-6- methoxyquinoline-3-carbonitrile
MP 192-195°C; Mass spec. 515.2 (ES +)
Example 52
4-F(2.4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-r(1-methylpiperidine-2- yl)methoxy1quinoline-3-carbonitrile
MP 178-179°C; Mass spec. 499.0 (ES -)
Example 53 is obtained analogously by the method of Example 1 and the corresponding alcohol.
Example 53
4-r(2,4-Dichloro-5-methoxyphenyl)amino1-6-methoxy-7-(piperidin-4- ylmethoxy)quinoline-3-carbonithle
MP 134-138°C; Mass spec. 485.3 (ES-)
The following Examples 54-57 are obtained analogously by the method of Example 27 and the corresponding amine.
Example 54
4-r(2.4-Dichloro-5-methoxyphenyl)amino]-7-(r3-(dimethylamino)propynamino|-6- methoxyquinoline-3-carbonitrile
MP 165-167°C ; Mass spec. 474.1 (ES+) Example 55
4-[(2,4-Dichloro-5-methoxyphenyl)amino1-7-(r3- (dimethylamino)propyl1(methyl)amino1-6-methoχyquinoline-3-carbonitrile
MP 116-117 °C ; Mass spec. 486.2 (ES-)
Example 56
4-r(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-.(2- methoxyethvDaminolquinoline-3-carbonitrile
MP 165-166°C ; Mass spec. 445.1 (ES-)
Example 57
6-Methoxy-7-(1-methyl-piperidin-4-ylmethoxy)-4-(r4-(pyridin-3-yloxy)- phenvnamino|quinoline-3-carbonitrile
Following the procedure used to prepare Reference Example 22, a mixture of 4- chloro-6- methoxy-7-[(1 -methylpiperidin-4-yl)methoxy]quinoline-3-carbonitrile (200 mg, 0.58 mmol) and 4-(pyridin-3-yloxy)phenylamine (161.5 mg, 0.87 mmol) (Cacciola, J.; Fevig, J. M.; Stouten, P. F. W.; Alexander, R. S.; Knabb, R. M.; Wexler, R. W. Bioorg. Med. Chem. Let. 2000, 10, 1253) provides 203 mg of 6-methoxy-7-[(1 - methylpiperidin-4-yl)methoxy]-4-{[4-(pyridin-3-yloxy)phenyl]amino}quinoline-3- carbonitrile, mp 182-184 °C.
MS 496.3 (M+H)+
Analysis for C29H29N5O3- 0.6 HCI
Calcd: C, 67.30, H 5.77, N 13.54.
Found: C, 67.23, H 5.65, N 13.38. Example 58
4-r(2.4-dichloro-5-methoxyphenyl)amino1-6-methoxy-7-ir3-(4-methylpiperazin-1- yl)propyπamino.quinoline-3-carbonitrile
MS 529.2 (ES+)
Example 59
4-r(2,4-dichloro-5-methoxyphenv0amino1-6-methoxy-7-,(3-morphdin-4- ylpropyl)amino1quinoline-3-carbonitrile
MS 516.1 (ES+)
Example 60
4-r(2,4-dichloro-5-methoxyphenv0amino1-7-(2,2-diethoxyethoxy)-6-methoxyquinoline- 3-carbonitrile
MS 506.2 (ES+)

Claims

1. A process for preparing a 7-substituted-3-quinoline or quinolone carbonitrile of Formula (I):
Figure imgf000075_0001
(IA)
wherein: 3 N —> is a ring of formula
Figure imgf000075_0002
and
X is selected from -O-, -S-, -NH-, and -NR2'-;
W is H or -OR3;
q is an integer of 0-5;
m is an integer of 0-2;
n is an integer of 2-5;
R1 is an alkyl group of 1 to 6 carbon atoms, a cycloalkyl group of 3 to 10 carbon atoms, or an aryl, or heteroaryl ring, said aryl or heteroaryl ring is optionally fused to an additional aryl or heteroaryl ring, said aryl or heteroaryl rings optionally fused may optionally be substituted with 1 to 4 substituents independently selected from the group consisting of -J, -NO2, -NH2, -OH, -SH, -CN, -N3, -COOH, -CONH2, -NHC(O)NH2, -C(O)H, -CF3, -OCF3, -R4, -OR4, -NHR4, -NR4R4, -S(O)mR4, -NHSO≥R4, -R5OH, -R5OR4, -R5NH2, -R5NHR4, -R5NR4R4, -R5SH, -R5S(O)mR4, -NHR6OH, -N(R4)R6OH, -N(R4)R6OR4, -NHR6NH2, -NHR6NHR4, -NHR6NR4R4, -N(R )R6NH2, -N(R4)R6NHR4, -N(R4)R6NHR4R4,- OR6OH, -OR6OR4, -OR6NH2, -OR6NHR4, - OR6NR4R4, -OC(0)R4, -NHC(O)R4, -NHC(O)NHR4,
-OR5C(O)R4, -NHR5C(O)R4, -C(O)R4, -C(O)OR4, -C(O)NHR4, -C(O)NR4R4, - R5C(O)H, -R5C(0)R4, -R5C(O)OH, -R5C(O)OR4, -R5C(O)NH2, -R5C(O)NHR4, - R5C(O)NR4R4, -R5OC(O)R4, -R5OC(O)NH2, -R5OC(0)NHR4 and -R5OC(O)NR4R4, and -YR7 groups wherein Y is independently selected from -C(O)-, -C(O)O-, -OC(O)-, -C(O)NH-, -NHC(O)-, -NHSO2-, -SO2NH-, -C(OH)H-, -Q(C(R8)2)q -, -(C(R8)2)q-,
-(C(R8)2)qQ-, -C=C-, cis- and trans -CH=CH- and cycloalkyl of 3-10 carbon atoms;
Q is -O-, -S(O)m-, -NH-, or -NR9-;
J is halogen selected from fluoro, chloro, bromo and iodo;
R2, R2' and R3 are each independently selected from
an alkyl group of 1 to 6 carbon atoms, an alkenyl group of 2 to 6 carbon atoms
or an alkynyl group of 2 to 6 carbon atoms, wherein each independent alkyl, alkenyl or alkynyl group is optionally substituted with -NO2, cyano, or -QR4, or R2, R2' and R3 are each independently selected from
-(C(R8)2)q-aryl, -(C(R8)2)q -heteroaryl, -(C(R8)2)q-heterocyclyl,
-(C(R8)2)n-Q-(C(R8)2)q-aryl, -(C(R8)2)n-Q-(C(R8)2)q-heteroaryl,
-(C(R8)2)n-Q-(C(R8)2)q-heterocyclyl, -(C(R8)2)n-Q-(C(R8)2)n-Q-aryl,
-(C(R8)2)n-Q-(C(R8)2)n-Q-heteroaryl, and -(C(R8)2)n-Q-(C(R8)2)n-Q-heterocyclyl, wherein the heterocyclyl group may optionally be substituted on carbon or nitrogen with a group selected from -R4, -(C(R8)2)q-aryl, -(C(R8)2)q-heteroaryl, -(C(R8)2)q-heterocyclyl, -(C(R8)2)q-SO2R4, or the heterocyclyl group may optionally be substituted on carbon by -(C(R8)2)q-QR4, or the heterocyclyl group may optionally be substituted on nitrogen by -(C(R8)2)n-QR4, and also wherein the aryl or heteroaryl group may optionally be substituted with a group selected from
-NO2, cyano, -R4, -(C(R8)2)q-aryl, -(C(R8)2)q-heteroaryl, -(C(R8)2)q-heterocyclyl, -(C(R8)2)q-SO2R4, and -(C(R8)2)q-QR4 and further provided that R2 and R2' may optionally be taken together with the nitrogen to which they are attached,
forming a heterocyclic ring having 3 to 8 ring members one of which is optionally an additional heteroatom selected from nitrogen, oxygen and sulfur, wherein said formed heterocyclic ring may optionally be substituted on carbon or nitrogen with a group -R4, or said heterocyclic ring may optionally be substituted on carbon by - (C(R8)2)q-QR4, or said heterocyclic ring may optionally be substituted on nitrogen by - (C(R8)2)n-QR4;
R4 is a monovalent group independently selected from alkyl of 1 to 6 carbon atoms, alkenyl of 2 to 6 carbon atoms, and alkynyl of 2 to 6 carbon atoms;
R5 is a divalent group independently selected from alkyl of 1 to 6 carbon atoms, alkenyl of 2 to 6 carbon atoms, and alkynyl of 2 to 6 carbon atoms;
R6 is a divalent alkyl group of 2 to 6 carbon atoms;
R7 is a cycloalkyl ring of 3 to 10 carbon atoms optionally substituted with one or more alkyl groups of 1 to 6 carbon atoms or an aryl or heteroaryl ring, optionally fused to an additional aryl or heteroaryl ring, wherein said aryl or heteroaryl ring optionally fused, may optionally be substituted with 1 to 4 substituents selected from the group consisting of aryl, -CH2-aryl, -NH-aryl, -O-aryl, -S(O)m-aryl, -J, -NO2, -NH2, -OH, -SH, -CN, -N3, -COOH, -CONH2, -NHC(0)NH2, -C(O)H, -CF3, -OCF3, -R4,
-OR4, -NHR4, -NR4R4, -S(O)mR4, -NHSO2R4, -R5OH, -R5OR4, -R5NH2, -R5NHR4,
-R5NR4R4, -R5SH, -R5S(O)mR4, -NHR6OH, -NHR6OR4, -N(R4)R6OH, -N(R4)R6OR4,
-NHR6NH2, -NHR6NHR4, -NHR6NR4R4, -N(R4)R6NH2, -N(R4)R6NHR4,
-N(R4)R6NHR4R4, -OR6OH, -OR6OR4, -OR6NH2, -OR6NHR4, -OR6NR4R4, -OC(O)R4,
-NHC(O)R4, -NHC(O)NHR4, -OR5C(O)R4, -NHR5C(O)R4,C(O)R4, -C(O)OR4,
-C(O)NHR4, -C(O)NR4R4, -R5C(O)H, -R5C(O)R4, -R5C(O)OH, -R5C(O)OR4, -R5C(O)NH2, -R5C(O)NHR4, -R5C(O)NR4R4, -R5OC(O)R4, -R5OC(O)NH2, -R5OC(O)NHR4 and -R5OC(O)NR4R4;
R8 is independently -H or -R4;
R9 is a monovalent alkyl group of 1 to 6 carbon atoms;
wherein aryl as used herein denotes a mono or bi-cyclic aromatic ring having 6 to 12 carbon atoms,
heteroaryl as used herein denotes a 5 or 6 membered aromatic ring, which contains 1 to 4 heteroatoms which may be the same or different selected from nitrogen, oxygen and sulfur;
and heterocyclyl denotes a saturated or partially unsaturated monocyclic radical containing 3 to 8 ring atoms selected from carbon, nitrogen, oxygen and sulfur with at least 1 and preferably 1 to 4, more preferably 1 to 2 nitrogen, oxygen or sulfur as ring atoms;
which comprises reacting a corresponding compound of Formula (IIA)
"XX) ("A)
wherein: X —) is as defined above; with a compound of the formula R2XH, where X is selected from -S-, -O-, -NH-, and -NR2'- and where R2' and R2 are as defined above or R2 and R2 may optionally be taken together with the nitrogen to which each is attached to form a heterocyclic ring, and in the presence of a base, when X is -O- or -S-, to provide a 7-substituted-3-quinolinecarbonitrile of Formula (IA)
_X (IA©) and if so desired converting a compound of Formula (IA) to a corresponding pharmaceutically acceptable salt by conventional means, and if so desired, converting the corresponding pharmaceutically acceptable salt to a compound of Formula (IA) by conventional means.
2. A process according to claim 1 in which the compound of formula IIA used as starting material is a 7-fluoro-4-(substituted amino)-3-quinolinecarbonitrile of formula 2
Figure imgf000079_0001
which is prepared by a process comprising the following steps:
a) reacting a 7-fluoro-4-oxo-1 ,4-dihydro-3-quinolinecarbonitrile of Formula (II)
Figure imgf000079_0002
with a halogenating reagent to provide a 7-fluoro-3-quinolinecarbonitrile 1 where Z is Cl or Br
Figure imgf000079_0003
and b) reacting the 7-fluoro-3-quinolinecarbonitrile product of formula 1 with an amine of the formula R1NH2 in the presence of pyridine hydrochloride to provide a 7-fluoro-4-(substituted amino)-3-quinolinecarbonitriIe of formula 2
Figure imgf000080_0001
defined in claim 1.
3. A process according to claim 1 in which the product of formula (IA) is a 7- substituted-4-oxo-1 ,4-dihydro-3-quinolinecarbonitrile of Formula 3
Figure imgf000080_0002
and this is converted to a compound of formula (I) by process comprising the
following steps:
a) reacting with a halogenating reagent to provide a 7-substituted-4-halo-3- quinolinecarbonitrile 4 where Z is Cl or Br
Figure imgf000080_0003
b) reacting the 7-substituted-4-halo-3-quinolinecarbonitrile of step a) with an amine R1NH2 in the presence of pyridine hydrochloride to afford a 7-substituted-
3-quinolinecarbonitrile of Formula (I)
Figure imgf000081_0001
and if so desired converting a compound of Formula (I) to a corresponding pharmaceutically acceptable salt by conventional means, and if so desired, converting the corresponding pharmaceutically acceptable salt to a compound of Formula (I) by conventional means.
4. A process according to any one of Claims 1 to 3 wherein the halogenating reagent is phosphorous oxychloride or phosphorous oxybromide.
5. A process according to any one of Claims 1 to 4 wherein R1 is substituted aryl.
6. A process according to any one of Claims 1 to 4 wherein R1 is selected from
2,4-dichloro-5-methoxyphenyl;
Cyclopentyl;
Butyl;
3,4,5-trimethoxyphenyl;
3-Chloro-4- (1 -methyl-1 H-imidazol-2-yl)sulfanyl]phenyl;
2,4-Dichorophenyl;
2-Chloro-5-methoxyphenyl;
5-methoxy-2-methylphenyl and
2,4-Dimethylphenyl.
7. A process according to any one of claims 1 to 6 wherein X is -O- or -S- and wherein said base is selected from potassium, potassium hydride, sodium and sodium hydride.
8. A process according to Claim 7 wherein said base is sodium or sodium hydride.
9. A process according to any one of claims 1 to 8 wherein R2 is selected from one of the following:
2-butynyl;
3-dimethylamino-2,2-dimethylpropyl;
3-(1 , 1 -dioxido-4-thiomorpholinyl)propyl;
2-[2-(1-piperazinyl)ethoxy]ethyl;
2-thienylmethyl;
benzyl; ethyl;
phenyl;
2-methoxyethyl;
pyridin-4-yl;
2-(1-methylpiperidin-4-yl)ethyl;
2-(1-methyl-3-piperidinyl)methyl
2-(1-methyI-4-piperidinyl)methyl;
2-(2-methoxy)ethyl;
3-(dimethylamino)propyl;
3-(4-ethyl-1 -piperazinyl)propyl; (1-methylpiperidine-4-yl)methyl;
tetrahydro-2H-pyran-2-ylmethyl;
3-(1-methylpiperidin-4-yl)propyl;
(3-(dimethylamino)propyl)methyl
(1 -methylpiperidin-4-yl)methyl;
3-(1 -methylpiperidine-4-yl)propyl;
3-(4-methyl-1-piperazinyl)propyl;
(1 -ethylpiperidine-4-yl)methyl;
(1-methylpiperidine-2-yl)methyl;
piperidin-4-ylmethyl;
and
3-(dimethylamino)propyl.
10. A process according to to any one of claims 1 to 6 wherein X is -NH- or - NR2'- and where R2' and R2 may optionally be taken together with the nitrogen to which each is attached to form a heterocyclic ring.
11. A process according to claim 10 wherein XR2 is selected from
4-methylpiperazin-1-yl or (4-pyrrolidin-1-ylpiperidin-1-yl).
12. A process according to any one of claims 1 to 4 for the preparation of a compound selected from the group consisting of:
7-(2-Butynyloxy)-4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-3- quinolinecarbonitrile; 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-(3-dimethylamino-2,2-dimethylpropoxy)- 6-methoxy-3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-[3-(1 ,1 -dioxido-4- thiomorpholinyl)propoxy]-6-methoxy-3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-{2-[2-(1- piperazinyl)ethoxy]ethoxy)-3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-(2-thienylmethoxy)-3- quinolinecarbonitrile;
7-Benzyloxy-4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-ethylsulfanyl-6-methoxy-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-phenylsulfanyl-3- quinolinecarbonitrile;
4-Cyclopentylamino-6-methoxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile;
4-Butylamino-6-methoxy-7-(2-methoxyethoxy)-3-quinolinecarbonitrile;
7-Benzylthio-4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-(pyridin-4-yloxy)-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[2-(1-methylpiperidin-4- yl)ethoxy]-3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[2-methoxyethoxy]-3- quinolinecarbonitrile; 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[2-(1-methyl-3- piperidinyl)methoxy]-3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[2-(1-methyl-4- piperidinyl)methoxy]-3-quinolinecarbonitrile;
6-Methoxy-7-[2-methoxyethoxy]-4-[(3,4,5-trimethoxyphenyl)amino]-3- quinolinecarbonitrile;
6-Methoxy-7-[(1-methylpiperidine-4-yl)methoxy]-4-[(3,4,5-trimethoxyphenyl)amino]-3- quinolinecarbonitrile;
4-({3-Chloro-4-[(1 -methyl-1 H-imidazol-2-yl)sulfanyl]phenyl}amino)-6-methoxy-7-[2-(2- methoxy)ethoxy]-3-quinolinecarbonitrile;
4-({3-Chloro-4-[(1 -methyl-1 H-imidazol-2-yl)sulfanyl]phenyl}amino)-7-[3- (dimethylamino)propoxy]-6-(2-methoxyethoxy)- 3-quinolinecarbonitrile;
4-({3-Chloro-4-[(1 -methyl-1 H-imidazol-2-yl)sulfanyl]phenyl}amino)-7-[3-(4-ethyl-1 - piperazinyl)propoxy]-6-(2-methoxyethoxy)- 3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-[2-methoxyethoxy]-7-[(1- methylpiperidine-4-yl)methoxy]3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-ethoxy-7-(2-methoxyethoxy)3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-(tetrahydro-2H-pyran-2- ylmethoxy)3-quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-(2-methoxyethoxy)-6-(2-morpholin-4- ylethoxy)3-quinolinecarbonitrile;
4-[3-Chloro-4-(1 -methyl-1 H-imidazol-2-ylsulfanyl)-phenylamino]-6-methoxy-7-(4- methylpiperazin-1-yl)-quinoline-3-carbonitrile; 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-{[3-(1-methylpiperidin-4- yl)propyl]amino}quinoline-3-carbonitrile;
4-[3-Chloro-4-(1 -methyl-1 H-imidazol-2-ylsulfanyl)-phenylamino]-7-{[3- (dimethyl)aminopropyl]amino}-6-methoxyquinoline-3-carbonitrile;
4-[3-Chloro-4-(1 -methyl-1 H-imidazol-2-ylsulfanyl)-phenylamino]-7-{[3- (dimethylamino)propyl]-methylamino}-6-methoxyquinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-[3-(4-methyl)piperazin-1-yl)propoxy]-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-[(1-methylpiperidin-4-yl)methoxy]-3- quinolinecarbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-(2-methoxyethoxy)-3- quinolinecarbonitrile;
4-[(2,4-Dichorophenyl)amino]-6-methoxy-7-(2-methoxyethoxy)quinoline-3- carbonitrile;
4-[(2,4-Dimethyl-5-methoxyphenyl)amino]-6-methoxy-7-(2-methoxyethoxy)quinoline- 3-carbonitrile;
4-[(2-Chloro-5-methoxyphenyl)amino]-6-methoxy-7-(2-methoxyethoxy)quinoline-3- carbonitrile;
6-Methoxy-7-(2-methoxyethoxy)-4-[(5-methoxy-2-methylphenyl)amino]-quinoline-3- carbonitrile;
4-[(2,4-Dimethylphenyl)amino]-6-methoxy-7-(2-methoxyethoxy)quinoline-3- carbonitrile;
4-[(2,4-Dichlorophenyl)amino]-6-methoxy-7-[(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile; 4-[(2,4-Dimethyl-5-methoxyphenyl)amino]-6-methoxy-7-[(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile;
6-Methoxy-4-[(5-methoxy-2-methylphenyl)amino]-7-[(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile;
4-[(2-Chloro-5-methoxyphenyl)amino]-6-methoxy-7-[(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile;
4-[(2,4-Dimethylphenyl)amino]-6-methoxy-7-[(1-methylpiperidine-4- yl)methoxy]quinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(1-methylpiperidine-4- yl)propoxy]quinoline-3-carbonitrile;
4-[(2-Chloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(1-methylpiperidine-4- yl)propoxy]quinoline-3-carbonitrile;
6-Methoxy-4-[(5-methoxy-2-methylphenyl)amino]-7-[3-(1-methylpiperidine-4- yl)propoxy]quinoline-3-carbonitrile;
4-[(2,4-Dimethylphenyl)amino]-6-methoxy-7-[3(1-methylpiperidine-4- yl)propoxy]quinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(4-methyl-1- piperazinyl)propoxy]quinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-[(1-ethylpiperidine-4-yl)methoxy]-6- methoxyquinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[(1-methylpiperidine-2- yl)methoxy]quinoline-3-carbonithle;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-(piperidin-4- ylmethoxy)quinoline-3-carbonitrile; 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-{[3-(dimethylamino)propyl]amino}-6- methoxyquinoline-3-carbonitrile;
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-7-{[3- (dimethylamino)propyl](methyl)amino]-6-methoxyquinoline-3-carbonitrile; and
4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[(2- methoxyethyl)amino]quinoline-3-carbonitrile.
13. A process according to Claim 1 for the preparation of a compound selected from the group consisting of:
4-[(2,4-Dichlorophenyl)amino]-7-(2-methoxyethoxy)quinoline-3-carbonitrile;
6-Butoxy-4-[(2,4-dichloro-5-methoxyphenyl)amino]-7-(2-methoxyethoxy)-3- quinolinecarbonitrile;
6-Methoxy-7-(4-methylpiperazin-1-yl)-4-(4-phenoxyphenylamino)-quinoline-3- carbonitrile;
4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-7-{[3-(4-methylpiperazin-1- yl)propyl]amino}quinoline-3-carbonitrile;
4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[(3-morphdin-4- ylpropyl)amino]quinoline-3-carbonitrile;
4-[(2,4-dichloro-5-methoxyphenyl)amino]-7-(2,2-diethoxyethoxy)-6-methoxyquinoline- 3-carbonitrile;
and
6-Methoxy~7-(1-methyl-piperidin-4-ylmethoxy)-4-{[4-(pyridin-3-yloxy)- phenyl]amino}quinoline-3-carbonitrile
14. A process according to Claim 1 for the preparation of a compound selected from the group consisting of:
6-Methoxy-7-(2-methoxyethoxy)-4-oxo-1 ,4,-dihydro-3-quinolinecarbonitrile; -Methoxy-7-(4-methyl-piperazin-1 -yl)-4-oxo-1 ,4-dihydroquinoline-3-carbonitrile; and
-(2-Methoxyethoxy)-4-oxo-1,4-dihydroquinoline-3-carbonitrile.
PCT/US2003/013149 2002-04-30 2003-04-29 Process for the preparation of 7-substituted-3-quinoline and 3-quinol-4-one carbonitriles WO2003093241A1 (en)

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