EP0620818A1 - ARYL KETONES AS TESTOSTERONE 5$g(a)-REDUCTASE INHIBITORS - Google Patents

ARYL KETONES AS TESTOSTERONE 5$g(a)-REDUCTASE INHIBITORS

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Publication number
EP0620818A1
EP0620818A1 EP93900373A EP93900373A EP0620818A1 EP 0620818 A1 EP0620818 A1 EP 0620818A1 EP 93900373 A EP93900373 A EP 93900373A EP 93900373 A EP93900373 A EP 93900373A EP 0620818 A1 EP0620818 A1 EP 0620818A1
Authority
EP
European Patent Office
Prior art keywords
compound
salt
ethyl
ester
nmr
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93900373A
Other languages
German (de)
French (fr)
Inventor
Satoshi Okada
Kozo Sawada
Akio Kuroda
Shinya Watanabe
Hirokazu Tanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujisawa Pharmaceutical Co Ltd
Original Assignee
Fujisawa Pharmaceutical Co Ltd
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Filing date
Publication date
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Publication of EP0620818A1 publication Critical patent/EP0620818A1/en
Withdrawn legal-status Critical Current

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    • 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
    • C07D215/20—Oxygen atoms
    • C07D215/22—Oxygen atoms attached in position 2 or 4
    • C07D215/233—Oxygen atoms attached in position 2 or 4 only one oxygen atom which is attached in position 4
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P13/00—Drugs for disorders of the urinary system
    • A61P13/02—Drugs for disorders of the urinary system of urine or of the urinary tract, e.g. urine acidifiers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P15/00—Drugs for genital or sexual disorders; Contraceptives
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00—Drugs for dermatological disorders
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C205/00—Compounds containing nitro groups bound to a carbon skeleton
    • C07C205/45—Compounds containing nitro groups bound to a carbon skeleton the carbon skeleton being further substituted by at least one doubly—bound oxygen atom, not being part of a —CHO group
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C205/00—Compounds containing nitro groups bound to a carbon skeleton
    • C07C205/49—Compounds containing nitro groups bound to a carbon skeleton the carbon skeleton being further substituted by carboxyl groups
    • C07C205/56—Compounds containing nitro groups bound to a carbon skeleton the carbon skeleton being further substituted by carboxyl groups having nitro groups bound to carbon atoms of six-membered aromatic rings and carboxyl groups bound to acyclic carbon atoms of the carbon skeleton
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C229/00—Compounds containing amino and carboxyl groups bound to the same carbon skeleton
    • C07C229/40—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino groups bound to carbon atoms of at least one six-membered aromatic ring and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton
    • C07C229/44—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino groups bound to carbon atoms of at least one six-membered aromatic ring and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton with carboxyl groups linked to the six-membered aromatic ring, or to the condensed ring system containing that ring, by unsaturated carbon chains
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
    • C07C69/66—Esters of carboxylic acids having esterified carboxylic groups bound to acyclic carbon atoms and having any of the groups OH, O—metal, —CHO, keto, ether, acyloxy, groups, groups, or in the acid moiety
    • C07C69/73—Esters of carboxylic acids having esterified carboxylic groups bound to acyclic carbon atoms and having any of the groups OH, O—metal, —CHO, keto, ether, acyloxy, groups, groups, or in the acid moiety of unsaturated acids
    • C07C69/738—Esters of keto-carboxylic acids or aldehydo-carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
    • C07D231/54—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings condensed with carbocyclic rings or ring systems
    • C07D231/56—Benzopyrazoles; Hydrogenated benzopyrazoles
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D235/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings
    • C07D235/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings condensed with carbocyclic rings or ring systems
    • C07D235/04—Benzimidazoles; Hydrogenated benzimidazoles
    • C07D235/24—Benzimidazoles; Hydrogenated benzimidazoles 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 in position 2
    • C07D235/26—Oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
    • C07D333/02—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
    • C07D333/04—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom
    • C07D333/06—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to the ring carbon atoms
    • C07D333/24—Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
    • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
    • C07D471/04—Ortho-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2602/00—Systems containing two condensed rings
    • C07C2602/02—Systems containing two condensed rings the rings having only two atoms in common
    • C07C2602/14—All rings being cycloaliphatic
    • C07C2602/26—All rings being cycloaliphatic the ring system containing ten carbon atoms
    • C07C2602/30—Azulenes; Hydrogenated azulenes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups

Definitions

  • the present invention relates to novel heterocyclic compound. More particularly, it relates to novel heterocyclic compound or a pharmaceutically acceptable salt thereof which has pharmacological activities such as inhibitory activity on testosteron 5 ⁇ -reductase and the like, to a process for preparation thereof, to a pharmaceutical composition comprising the same and to a use of the same as a medicament.
  • one object of the present invention is to provide novel heterocyclic compound or a pharmaceutically acceptable salt thereof, which is of use as a testosteron 5 ⁇ -reductase inhibitor.
  • Another object of the present invention is to provide a process for preparation of said heterocyclic compound or a salt thereof.
  • a further object of the present invention is to provide a pharmaceutical composition comprising, as an active ingredient, said heterocyclic compound or a pharmaceutically acceptable salt thereof.
  • Still further object of the present invention is to provide a use of said heterocyclic compound or a pharmaceutically acceptable salt thereof as a medicament such as testosteron 5 ⁇ -reductase inhibitor useful for treating or preventing testosteron 5 ⁇ -reductase-mediated diseases such as prostatomegaly, prostatism, alopecia, acnes, and the like in human being or animals.
  • heterocyclic compound of the present invention is novel and can be represented by the formula (I) :
  • R is carboxy(lower)alkyl or protected carboxy(lower)alkyl
  • X is optionally substituted arylene
  • R6 is hydrogen, lower alkyl, optionally substituted aralkyl or amino-protective group
  • A is a bivalent radical derived from imidazopyridine, azulene, thiophene, pyrrolo[2,3-bjpyridine, quinolone, indazole or dihydrobenzimidazole, each of which may be substituted by one or more suitable substituent(s) .
  • the object compound (I) and a salt thereof can be prepared by the following processes.
  • Process 1 the object compound (I) and a salt thereof can be prepared by the following processes.
  • R 1, R2, A, X and Y are each as defined above,
  • R_. is protected carboxy(lower)alkyl, and R, 1 is carboxy(lower)alkyl.
  • Suitable salts of the compound (I) are conventional non-toxic, pharmaceutically acceptable salt and may include a salt with a base or an acid addition salt such as a salt with an inorganic base, for example, an alkali metal salt (e.g. sodium salt, potassium salt, cesium salt, etc.), an alkaline earth metal salt (e.g. calcium salt, magnesium salt, etc.), an ammonium salt; a salt with an organic base, for example, an organic amine salt (e.g.
  • triethylamine salt pyridine salt, picoline salt, ethanolamine salt, triethanolamine salt, dicyclohexylamine salt, N,N'-dibenz ⁇ lethylenediamine salt, etc.), etc.
  • an inorganic acid addition salt e.g. hydrochloride, hydrobromide, sulfate, phosphate, etc.
  • an organic carboxylic or sulfonic acid addition salt e.g. formate, acetate, trifluoroacetate, maleate, tartrate, methanesulfonate, benzenesulfonate, p-toluenesulfonate, etc.
  • a salt with a basic or acidic amino acid e.g.
  • the compound (I) possesses stereoisomers such as optical isomers due to the presence of asymmetric carbon atom(s), and such isomers are also included within a scope of the present invention.
  • lower is intended to mean 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms, unless otherwise indicated.
  • Suitable “lower alkyl” may include straight or branched one having 1 to 6 carbon ato (s) , such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, hexyl, and the like, preferably one having 1 to 4 carbon atoms.
  • Carboxy(lower)alkyl means lower alkyl as explained above, which is substituted by a carboxy group at its optional positions, and suitable example thereof may be carboxymethyl, carboxyethyl, carboxypropyl, carboxybutyl, carboxypentyl, carboxyhexyl, and the like, in which preferable one is carboxy(C..-C.)alkyl and the most preferable one is 3-carboxypropyl.
  • Protected carboxy(lower)alkyl means carboxy(lower)alkyl as explained above, in which the carboxy group is protected by a conventional carboxy-protective group, and suitable "protected carboxy” moiety of "protected carboxy(lower)alkyl” may include an esterified carboxy group. Suitable examples of the ester moiety of an
  • esterified carboxy may be a conventional one such as lower alkyl ester (e.g. methyl ester, ethyl ester, propyl ester, isopropyl ester, butyl ester, isobutyl ester, tert-butyl ester, pentyl ester, hexyl ester, etc.) which may have at least one suitable substituent(s) , for example, lower cycloalkyKlower)alkyl ester (e.g. 1-cyclopropylethyl, etc.), lower alkan ⁇ yloxy(lower)alkyl ester (e.g.
  • acetoxymethyl ester propionyloxymethyl ester, butyryloxymethyl ester, valeryloxymethyl ester, pivaloyloxymethyl ester, hexanoyloxymethyl ester, l(or 2)- acetoxyethyl ester, 1(or 2 or 3)-acetoxypropyl este , l(or 2 or 3 or 4)-acetoxybutyl ester, l(or 2)-propionyl- oxyethyl ester, l(or 2 or 3)-propionyloxypropyl ester, l(or 2)-butyryloxyethyl ester, l(or 2)-isobutyryloxyethyl ester, l(or 2)-pivaloyloxyethyl ester, l(or 1)
  • benzyl ester 4-methoxybenzyl ester, 4-nitrobenzyl ester, phenethyl ester, trityl ester, benzhydryl ester, bis(methoxyphenyl)methyl ester, 3,4-dimethoxybenzyl ester, 4-hydroxy-3,5-di-tert-butylbenz ⁇ l ester, etc.); aryl ester which may have at least one suitable substituent(s) (e.g.
  • phenyl ester 4-chlorophenyl ester, tolyl ester, tert-butylphenyl ester, xylyl ester, mesityl ester, cumenyl ester, etc.); phthalidyl ester; and the like.
  • protected carboxy(lower)alkyl may be esterified carboxy(lower)alkyl such as lower alkoxycarbonyKlower)alkyl, more preferably 3-lower alkoxycarbonylpropyl (e.g. 3-methoxycarbonylpropyl, 3-ethoxycarbonylpropyl, 3-propoxycarbonylpropyl,
  • Aralkyl in “optionally substituted aralkyl” means straight or branched C--C- Q , preferably C--Cg alkyl substituted by aryl, and suitable "optionally substituted aralkyl” thus defined may include aralkyl (e.g.
  • aryl e.g. phenyl, tolyl, xylyl , naphthyl, etc.
  • a idated carboxy such as carbamoyl, mono or di(lower)alkylcarbamoyl (e.g. methylcarbamoyl, dimethylcarbamoyl, ethylcarbamoyl . diethylcarbamoyl, butylcarbamoyl, t-butylcarbamoyl, etc. )
  • lower alkylarylcarbamoyl e.g. isobutylphenylcarbamoyl, etc.
  • optionally substituted aralkyl may be benzyl, benzhydryl, trityl, phenethyl, 1-phenylethy1, methylbenzyl , isobutylbenzyl, methylphenylethyl, isobutylphenylethyl, methylphenylpropyl, isobutylphenyIpropyl, methylphenylpentyl, isobutylphenylpent 1, bis(methylphenyl)methyl, bis(propylphenyl)methyl, bis(butylphenyl)methyl, bis(isobutylphenyl)methyl, bis(chlorophenyl)methyl, (cyano) (isobutylphenyl)methyl, (carboxy) (isobutylphenyl)methyl, (benzyloxycarbony1) (isobutylphenyl)methyl, (N,N-diethylcarbamoyl) (
  • Suitable “amino-protective group” may be a conventional protective group which is used in the field of peptide chemistry, that is, may include acyl such as lower alkanoyl (e.g. formyl, acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, hexanoyl etc.), lower alkoxycarbonyl (e.g. methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, butoxycarbonyl, t-butoxycarbonyl, etc.), ar(lower)alkyl (e.g. benzyl, benzhydryl, trityl, etc.), and the like.
  • acyl such as lower alkanoyl (e.g. formyl, acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, hexanoy
  • Optionally substituted arylene means a bivalent radical derived from arene, preferably c g ⁇ c * ⁇ g arene ' suc h as benzene, toluene, xylene, mesitylene, naphthalene, and the like, which may be substituted by one or more, preferably one or two suitable substituents such as halogen as mentioned above, lower alkoxy (e.g. methoxy, ethoxy, propoxy, isobutoxy, butoxy, etc. ) , and the like. Suitable example thereof may be 1,2-phenylene, 1,3-phenylene, 1,4-phenylene, 5-methyl-1,3-phenylene, 2,3-dimethyl-l,4-phenylene, 1,2-naphthylene,
  • Suitable "a bivalent radical derived from imidazopyridine” may be imidazo[l,5-a]pyridin-diyl such as imidazo[l,5-a]pyridin-l,3-di ⁇ l, and the like.
  • Suitable "a bivalent radical derived from azulene” may be azulen-diyl such as azulen-l,3-diyl, and the like.
  • Suitable "a bivalent radical derived from thiophene” may be thien-diyl such as thien-2,5-diyl, and the like.
  • Suitable "a bivalent radical derived from pyrrolo[2,3-b]pyridine” may be lH-pyrrolo[2,3-b]p ⁇ ridin-diyl such as lH-pyrrolo[2,3-b]pyridin-l,3-di ⁇ l, and the like.
  • Suitable "a bivalent radical derived from guinolone” may be 4-(lH)-quinolon-diyl such as 4- ( lH) -guinolon-l , 3-diyl, and the like.
  • Suitable "a bivalent radical derived from indazole” may be lH-imidazol-diyl such as lH-indazol-l,3-diyl, and the like.
  • Suitable "a bivalent radical derived from dihydrobenzimidazole” may be 2,3-dihydro-lH-benzimidazol-diyl such as 2,3-dih ⁇ dro-lH-benzimidazol-l,3-diyl, and the like.
  • the bivalent radicals mentioned above may be substituted by one or more, preferably one to three suitable substituent(s) such as aryl (e.g. phenyl, tolyl, xylyl, naphthyl, etc. ) , lower alkyl as mentioned above, halogen as mentioned above, hydroxy, lower alkoxy (e.g. methoxy, ethoxy, propoxy, isopropoxy, etc.), and the like.
  • suitable "halogen” may be the same as those given in the above.
  • Suitable "protected hydroxy” may be lower alkyl, ar(lower)alkyl and acyloxy explained above, and the like.
  • the object compound (I) or a salt thereof can be prepared by reacting the compound (II) or a salt thereof with the compound (III) or its reactive derivative at the hydroxy group, or a salt thereof.
  • Suitable salt of the compounds (II) and (III) or its reactive derivative at the hydroxy group may be the same that exemplified for the compound (I) .
  • Suitable "reactive derivative at the hydroxy group" of the compound (III) may include an acid residue such as halo (e.g. bromo, chloro, iodo, etc.), acyloxy (e.g. acetoxy, mesyloxy, tosyloxy, etc.), and the like. This reaction is usually carried out in a solvent such as chloroform, dichloromethane, benzene,
  • the reaction may be carried out in the presence of an inorganic or an. organic base such as an alkali metal hydroxide [e.g. sodium hydroxide, potassium hydroxide, etc.], an alkali metal carbonate [e.g. sodium carboante, potassium carbonate, etc.], an alkali metal bicarbonate
  • an alkali metal hydroxide e.g. sodium hydroxide, potassium hydroxide, etc.
  • an alkali metal carbonate e.g. sodium carboante, potassium carbonate, etc.
  • an alkali metal bicarbonate e.g. sodium hydroxide, potassium hydroxide, etc.
  • alkali metal hydride e.g. sodium hydride, potassium hydride, etc.
  • alkali metal hydride e.g. sodium hydride, potassium hydride, etc.
  • tri(lower)alkylamine e.g. trimethylamine, triethylamine, diisopropylethylamine , etc.
  • pyridine or its derivative e.g. picoline, lutidine
  • the base to be used is liquid, it can also be used as a solvent.
  • this reaction can be carried out in the presence of a conventional condensing agent which is capable of condensing alcohols and amines.
  • the reaction temperature is not critical, and the reaction can be carried out under cooling, at room temperature or under warming or heating.
  • the object compound (l-b) or a salt thereof can be prepared by subjecting the compound (I-a) or a salt thereof to removal reaction of the carboxy-protective ⁇ group in R cL.
  • Suitable salt of the compounds (I-a) and (l-b) may be the same as that exemplified for the compound (I) .
  • the carboxy-protective group is an ester
  • it can be removed by hydrolysis or removal using Lewis acid.
  • the hydrolysis is preferably carried out in the presence of a base or an acid.
  • Suitable base may include, for example, an inorganic base such as alkali metal hydroxide (e.g. sodium hydroxide, potassium hydroxide, etc.), alkaline earth metal hydroxide (e.g. magnesium hydroxide, calcium hydroxide, etc.), alkali metal carbonate (e.g. sodium carbonate, potassium carbonate, etc.), alkaline earth metal carboante (e.g. magnesium carbonate, calcium carbonate, etc.), alkali metal bicarbonate (e.g. sodium bicarbonate, potassium bicarbonate, etc.), alkali metal acetate (e.g. sodium acetate, potassium acetate, etc.), alkaline earth metal phosphate (e.g. magnesium phosphate, calcium phosphate, etc.
  • an inorganic base such as alkali metal hydroxide (e.g. sodium hydroxide, potassium hydroxide, etc.), alkaline earth metal hydroxide (e.g. magnesium hydroxide, calcium hydroxide, etc.), alkali metal carbonate
  • alkali metal hydrogen phosphate e.g. disodium hydrogen phosphate, dipotassium hydrogen phosphate, etc.
  • the hydrolysis using a base is often carried out in water or a hydrophilic organic solvent or a mixed solvent thereof.
  • Suitable acid may include an organic acid (e.g. formic acid, acetic acid, propionic acid, benzoic acid etc. ) and an inorganic acid (e.g. hydrochloric acid, hydrobromic acid, sulfuric acid, etc.).
  • organic acid e.g. formic acid, acetic acid, propionic acid, benzoic acid etc.
  • inorganic acid e.g. hydrochloric acid, hydrobromic acid, sulfuric acid, etc.
  • the present hydrolysis is usually carried out in an organic solvent such as alcohol (e.g. methanol, ethanol, etc.), tetrahydrofuran, N,N-dimethylformamide, water or a mixed solvent thereof.
  • organic solvent such as alcohol (e.g. methanol, ethanol, etc.), tetrahydrofuran, N,N-dimethylformamide, water or a mixed solvent thereof.
  • the reaction temperature is not critical, and its may suitably be selected in accordance with the kind of the carboxy-protective group and the removing method.
  • the removal using Lewis acid is preferably to remove substituted or unsubstituted ar(lower)alkyl ester and carried out by reacting the compound (I-a) or a salt thereof with Lewis acid such as boron trihalide (e.g. boron trichloride, boron trifluoride, etc. ) , titanium tetrahalide (e.g. titanium tetrachloride, titanium tetrabromide, etc.), tin tetrahalide (e.g. tin tetrachloride, tin tetrabromide, etc.
  • This removal reaction is preferably carried out in the presence of cation trapping agents (e.g. anisole, phenol, etc.) and is usually carried out in a solvent such as nitroalkane (e.g. nitromethane, nitroethane, etc.), alkylene halide (e.g. methylene chloride, ethylene chloride, etc. ) , diethyl ether, carbon disulfide or any other solvent which does not adversely affect the reaction. These solvents may be used as a mixture thereof.
  • the reduction can be applied preferably for removing the protective-group such as halo(lower)alkyl (e.g. 2-iodoeth ⁇ l, 2,2,2-trichloroethyl, etc.) ester, ar(lower)alkyl (e.g. benzyl, etc.) ester or the like.
  • the reduction method applicable for the removal reaction may include, for example, reduction by using a combination of a metal (e.g. zinc, zinc amalgam, etc.) or a salt of chromium compound (e.g. chromous chloride, chromous acetate, etc. ) and an organic or an inorganic acid (e.g. acetic acid, propionic acid, hydrochloric acid, etc. ) ; and conventional catalytic reduction in the pressure of a conventional metallic catalyst (e.g. Palladium carbon, Raney nickel, etc.).
  • a metal e.g. zinc, zinc amalgam, etc.
  • the reaction temperature is not critical, and the reaction is usually carried out under cooling, at ambient temperature or under warming.
  • the object compound (I) thus prepared can be iolated and purified in a conventional manner, for example, extraction, precipitation, fractional crystallization, recrystallization, chromatography, and the like.
  • the object compound (I) of the present invention can be converted to its salt by a conventional method.
  • the optically active compound can be prepared by a conventional optical resolution method or by selecting the optical active starting compound.
  • the starting compound (II) can be prepared by the following methods, the details of which are shown in Preparations mentioned below, or a conventional manner.
  • Ya is nitro or protected hydroxy
  • Methods A, B and C can be carried out in a conventional manner.
  • the object compound (I) of the present invention is useful as a testosteron 5 ⁇ -reductase inhibitor and effective to testosteron 5 ⁇ -reductase-mediated diseases such as prostatomegaly, prostatism, prostatic cancer, alopecia, hirsutism (e.g. female hirsutism, etc.), androgenic alopecia (or male-pattern baldness), acne (e.g. acne vulgaris, pimple etc.), other hyperandrogenism, and the like.
  • testosteron 5 ⁇ -reductase inhibitor and effective to testosteron 5 ⁇ -reductase-mediated diseases such as prostatomegaly, prostatism, prostatic cancer, alopecia, hirsutism (e.g. female hirsutism, etc.), androgenic alopecia (or male-pattern baldness), acne (e.g. acne vulgaris, pimple etc.), other hyperandrogenism, and the like.
  • 3 1,2,6,7- H-Testosterone (85-105 Ci/mmol) 3 1,2,6,7- H-Testosterone (85-105 Ci/mmol) is a mixture 3 of 1,2,6,7- H-testosterone and testosterone which 3 includes 85-105 Ci of 1,2,6,7- H-testosterone per mmol of testosterone and is purchased from New
  • Aquazol-2 (Aquazol-2-Universal LSC Cocktail) : trademark, purchased from New England Nuclear, Boston, Mass., U.S.A.
  • the reaction solution contains 1 mM dithiothreitol
  • test Compound was added in 10 ⁇ l of 10% ethanol whereas control tubes received the same volume of 10% ethanol.
  • the reaction was started with the addition of the enzyme suspension. After incubation at 37°C for 30 inut :-, the reaction was extracted with 1 ml of ethyl acetate.
  • the object compound (I) or a pharmaceutically acceptable salt of the present invention is used in the form of conventional pharmaceutical preparation which contains said compound as an active ingredient, in admixture with pharmaceutically acceptable carriers such as an organic or inorganic solid or liquid excipient which is suitable for oral, parenteral, external and topical administration.
  • pharmaceutically acceptable carriers such as an organic or inorganic solid or liquid excipient which is suitable for oral, parenteral, external and topical administration.
  • the pharmaceutical preparation may be in solid or semi-solid from such as tablet, granule, powder, capsule, suppository, cream, ointment, or liquid form such as solution, suspension, syrup, emulsion, lemonade, lotion and the like.
  • auxiliary substances stabilizing agents, wetting agents and other commonly used additives such as lactose, citric acid, tartaric acid, stearic acid, magnesium stearate, terra alba, sucrose, corn starch, talc, gelatin, agar, pectin, peanut oil, olive oil, cacao butter, ethylene glycol, and the like.
  • dosage of the compound (I) may very from and also depend upon the age, conditions of the patient, a kind of diseases, a kind of the compound (I) to be applied, etc. In general amounts between 0.01 mg and about 500 mg or even more per day may be administered to a patient.
  • An average single dose of about 0.05 mg, 0.1 mg, 0.25 mg, 0.5 mg, 1 mg, 20 mg, 50 mg, 100 mg of the object compound (I) of the present invention may be used in treating diseases.
  • 3-(3-Nitrobenzoyl)-lH-p ⁇ rrolo[2,3-b]pyridine could be obtained by reacting lH-pyrrolo[2,3-b]pyridine with 3-nitrobenzoyl chloride in accordance with a similar manner to that of Preparation 4.
  • Ethyl 4-(thien-2-yl)butyrate could be obtained by reacting 4-(thien-2-yl)butyric acid with ethanol in accordance with a similar manner to that of Preparation 2-(2).
  • Ethyl 4-oxo-4-(3-phenylthien-2-yl)butyrate could be obtained by reacting 3-phenylthiophene with ethyl succinyl chloride in accordance with a similar manner to that of Preparation 3-(1) .
  • Example 10 The compounds described in the following Examples 10 to 15 could be obtained by hydrolyzing the corresponding ethyl ester with aqueous sodium hydroxide in accordance with a similar manner to that of Example 9.
  • Example 10

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Abstract

Composé hétérocyclique de la formule: R1-A-CO-X-Y-R2 dans laquelle R1 représente carboxyalkyle (inférieur) ou carboxyalkyl (inférieur) protégé, R2 représente aralkyle éventuellement substitué, X représente arylène éventuellement substitué, Y représente -O- ou (a), R6 représentant hydrogène, alkyle inférieur, aralkyle éventuellement substitué ou un groupe amino-protecteur, et A représente un radical bivalent dérivé d'imidazopyridine, d'azulène, de thiophène, de pyrrolo[2,3-b]pyridine, de quinolone, d'indazole ou de dihydrobenzimidazole, dont chacun peut être substitué par au moins un substituant approprié. Ce composé peut être utilisé comme inhibiteur de testostérone 5alpha-réductase.Heterocyclic compound of the formula: R1-A-CO-XY-R2 in which R1 represents (lower) carboxyalkyl or protected (lower) carboxyalkyl, R2 represents optionally substituted aralkyl, X represents optionally substituted arylene, Y represents -O- or (a ), R6 representing hydrogen, lower alkyl, optionally substituted aralkyl or an amino-protecting group, and A represents a bivalent radical derived from imidazopyridine, azulene, thiophene, pyrrolo [2,3-b] pyridine, quinolone , indazole or dihydrobenzimidazole, each of which may be substituted by at least one suitable substituent. This compound can be used as a testosterone 5alpha-reductase inhibitor.

Description

DESCRIPTION
Aryl Ketones as testosterone 5* - reductase Inhibitors
Technical Field
The present invention relates to novel heterocyclic compound. More particularly, it relates to novel heterocyclic compound or a pharmaceutically acceptable salt thereof which has pharmacological activities such as inhibitory activity on testosteron 5α-reductase and the like, to a process for preparation thereof, to a pharmaceutical composition comprising the same and to a use of the same as a medicament.
Disclosure of the Invention
Accordingly, one object of the present invention is to provide novel heterocyclic compound or a pharmaceutically acceptable salt thereof, which is of use as a testosteron 5α-reductase inhibitor.
Another object of the present invention is to provide a process for preparation of said heterocyclic compound or a salt thereof. A further object of the present invention is to provide a pharmaceutical composition comprising, as an active ingredient, said heterocyclic compound or a pharmaceutically acceptable salt thereof. Still further object of the present invention is to provide a use of said heterocyclic compound or a pharmaceutically acceptable salt thereof as a medicament such as testosteron 5α-reductase inhibitor useful for treating or preventing testosteron 5α-reductase-mediated diseases such as prostatomegaly, prostatism, alopecia, acnes, and the like in human being or animals.
The heterocyclic compound of the present invention is novel and can be represented by the formula (I) :
R-^A-CO-X-Y-R2 (I)
in which R is carboxy(lower)alkyl or protected carboxy(lower)alkyl,
2 R is optionally substituted aralkyl,
X is optionally substituted arylene,
wherein R6 is hydrogen, lower alkyl, optionally substituted aralkyl or amino-protective group, and
A is a bivalent radical derived from imidazopyridine, azulene, thiophene, pyrrolo[2,3-bjpyridine, quinolone, indazole or dihydrobenzimidazole, each of which may be substituted by one or more suitable substituent(s) .
According to the present invention, the object compound (I) and a salt thereof can be prepared by the following processes. Process 1
R -A-CO-X-Y-H HO-R
(ID (III) or a salt thereof or its reactive derivative at the hydroxy group, or a salt thereof
R1-A-CO-X-Y-R2
(I) or a salt thereof
Process 2
Removal or the carboxy-protective group
(I-a) or a salt thereof
(l-b) or a salt thereof
wherein R 1, R2, A, X and Y are each as defined above,
R_. is protected carboxy(lower)alkyl, and R, 1 is carboxy(lower)alkyl.
Suitable salts of the compound (I) are conventional non-toxic, pharmaceutically acceptable salt and may include a salt with a base or an acid addition salt such as a salt with an inorganic base, for example, an alkali metal salt (e.g. sodium salt, potassium salt, cesium salt, etc.), an alkaline earth metal salt (e.g. calcium salt, magnesium salt, etc.), an ammonium salt; a salt with an organic base, for example, an organic amine salt (e.g. triethylamine salt, pyridine salt, picoline salt, ethanolamine salt, triethanolamine salt, dicyclohexylamine salt, N,N'-dibenzγlethylenediamine salt, etc.), etc.; an inorganic acid addition salt (e.g. hydrochloride, hydrobromide, sulfate, phosphate, etc.); an organic carboxylic or sulfonic acid addition salt (e.g. formate, acetate, trifluoroacetate, maleate, tartrate, methanesulfonate, benzenesulfonate, p-toluenesulfonate, etc.); a salt with a basic or acidic amino acid (e.g. arginine, aspartic acid, glutamic acid, etc.); and the like, and the preferable example thereof is an acid addition salt. The compound (I) possesses stereoisomers such as optical isomers due to the presence of asymmetric carbon atom(s), and such isomers are also included within a scope of the present invention.
In the above and subsequent descriptions of the present specification, suitable examples and illustrations of the various definitions which the present invention include within the scope thereof are explained in detail as follows.
The term "lower" is intended to mean 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms, unless otherwise indicated.
Suitable "lower alkyl" may include straight or branched one having 1 to 6 carbon ato (s) , such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, hexyl, and the like, preferably one having 1 to 4 carbon atoms.
"Carboxy(lower)alkyl" means lower alkyl as explained above, which is substituted by a carboxy group at its optional positions, and suitable example thereof may be carboxymethyl, carboxyethyl, carboxypropyl, carboxybutyl, carboxypentyl, carboxyhexyl, and the like, in which preferable one is carboxy(C..-C.)alkyl and the most preferable one is 3-carboxypropyl.
"Protected carboxy(lower)alkyl" means carboxy(lower)alkyl as explained above, in which the carboxy group is protected by a conventional carboxy-protective group, and suitable "protected carboxy" moiety of "protected carboxy(lower)alkyl" may include an esterified carboxy group. Suitable examples of the ester moiety of an
"esterified carboxy" may be a conventional one such as lower alkyl ester (e.g. methyl ester, ethyl ester, propyl ester, isopropyl ester, butyl ester, isobutyl ester, tert-butyl ester, pentyl ester, hexyl ester, etc.) which may have at least one suitable substituent(s) , for example, lower cycloalkyKlower)alkyl ester (e.g. 1-cyclopropylethyl, etc.), lower alkanσyloxy(lower)alkyl ester (e.g. acetoxymethyl ester, propionyloxymethyl ester, butyryloxymethyl ester, valeryloxymethyl ester, pivaloyloxymethyl ester, hexanoyloxymethyl ester, l(or 2)- acetoxyethyl ester, 1(or 2 or 3)-acetoxypropyl este , l(or 2 or 3 or 4)-acetoxybutyl ester, l(or 2)-propionyl- oxyethyl ester, l(or 2 or 3)-propionyloxypropyl ester, l(or 2)-butyryloxyethyl ester, l(or 2)-isobutyryloxyethyl ester, l(or 2)-pivaloyloxyethyl ester, l(or
2)-hexanoyloxyethyl ester, isobutyryloxymethyl ester, 2-ethylbutγryloxymethyl ester,
3,3-dimethylbutyryloxymethyl ester, 1(or 2)-pentanoyloxy- ethyl ester, etc.) lower alkanesulfonyKlower) lkyl ester (e.g. 2-mesylethyl ester, etc.), mono(or di or tri)-halo(lower)alkyl ester (e.g. 2-iodoethyl ester, 2,2,2-trichloroethyl ester, etc.), lower alkoxycarbonyloxy(lower)alkyl ester (e.g. methoxycarbonyloxymethyl ester, ethoxycarbonyloxymethyl ester, 2-methoxycarbonyloxyethyl ester, 1-ethoxycarbonyloxyethyl ester, 1-isopropoxycarbonyloxyethyl ester, etc. ) , phthalidylidene(lower)alkyl ester, or (5-lower alkyl-2-oxo-l,3-dioxol-4-yl) (lower)alkyl ester (e.g. (5-methyl-2-oxo-l,3-dioxol-4-yl)methyl ester, (5-ethyl-2-oxo-l,3-dioxol-4-yl)methyl ester, (5-propγl-2-oxo-l,3-dioxol-4-yl)ethyl ester, etc.; lower alkenyl ester (e.g. vinyl ester, allyl ester, etc.); lower alkynyl ester (e.g. ethynyl ester, propynyl ester, etc.); ar(lower)alkyl ester which may have at least one suitable substituent(s) (e.g. benzyl ester, 4-methoxybenzyl ester, 4-nitrobenzyl ester, phenethyl ester, trityl ester, benzhydryl ester, bis(methoxyphenyl)methyl ester, 3,4-dimethoxybenzyl ester, 4-hydroxy-3,5-di-tert-butylbenzγl ester, etc.); aryl ester which may have at least one suitable substituent(s) (e.g. phenyl ester, 4-chlorophenyl ester, tolyl ester, tert-butylphenyl ester, xylyl ester, mesityl ester, cumenyl ester, etc.); phthalidyl ester; and the like.
Preferable example of "protected carboxy(lower)alkyl" thus defined may be esterified carboxy(lower)alkyl such as lower alkoxycarbonyKlower)alkyl, more preferably 3-lower alkoxycarbonylpropyl (e.g. 3-methoxycarbonylpropyl, 3-ethoxycarbonylpropyl, 3-propoxycarbonylpropyl,
3-isopropoxycarbonylpropyl, 3-butoxycarbonylpropyl, 3-isobutoxycarbonylpropy1, 3-tert-butoxycarbonyIpropyl, 3-pentyloxycarbonyIpropyl, 3-tert-pentyloxycarbonyIpropyl, 3-hexyloxycarbonyIpropyl, etc. ) . "Aralkyl" in "optionally substituted aralkyl" means straight or branched C--C-Q, preferably C--Cg alkyl substituted by aryl, and suitable "optionally substituted aralkyl" thus defined may include aralkyl (e.g. trityl, benzhydryl, benzyl, phenethyl, naphthylmethyl , 1-phenylethγl, 1-phenylpropyl, 1-phenylbutyl, 1-phenylpenty1, 1-phen Ihexy1, 1-phenylheptyl, 1-phenyloctyl, 1-phenyldecyl, 2 , 2-dimethyl-1-phenylpropyl, etc. ) , substituted ar(lower)alkyl, for example, aralkyl substituted by one or more, preferably one to four substituents such as lower alkyl as mentioned above, halogen (e.g. fluoro, chloro, bromo, iodo, etc.), cyano, carboxy, protected carboxy as mentioned above, aryl (e.g. phenyl, tolyl, xylyl , naphthyl, etc. ) , a idated carboxy such as carbamoyl, mono or di(lower)alkylcarbamoyl (e.g. methylcarbamoyl, dimethylcarbamoyl, ethylcarbamoyl . diethylcarbamoyl, butylcarbamoyl, t-butylcarbamoyl, etc. ) , lower alkylarylcarbamoyl (e.g. isobutylphenylcarbamoyl, etc. ) , and the like.
Preferable example of thus defined "optionally substituted aralkyl" may be benzyl, benzhydryl, trityl, phenethyl, 1-phenylethy1, methylbenzyl , isobutylbenzyl, methylphenylethyl, isobutylphenylethyl, methylphenylpropyl, isobutylphenyIpropyl, methylphenylpentyl, isobutylphenylpent 1, bis(methylphenyl)methyl, bis(propylphenyl)methyl, bis(butylphenyl)methyl, bis(isobutylphenyl)methyl, bis(chlorophenyl)methyl, (cyano) (isobutylphenyl)methyl, (carboxy) (isobutylphenyl)methyl, (benzyloxycarbony1) (isobutylphenyl)methyl, (N,N-diethylcarbamoyl) (isobutylphenyl) ethyl, (t-butylcarbamoyl) (isobutylphenyl)methyl, (phenylcarbamoyl) (isobutylphenyl)methyl, (isobutylphenylcarbamoyl) (isobutylphenyl)methyl, etc. ] , and the like, more preferably bis[ (lower)alkylphenyl]methyl, and the most preferably bis[isobutylphenyl]methyl.
Suitable "amino-protective group" may be a conventional protective group which is used in the field of peptide chemistry, that is, may include acyl such as lower alkanoyl (e.g. formyl, acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, hexanoyl etc.), lower alkoxycarbonyl (e.g. methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, butoxycarbonyl, t-butoxycarbonyl, etc.), ar(lower)alkyl (e.g. benzyl, benzhydryl, trityl, etc.), and the like.
"Optionally substituted arylene" means a bivalent radical derived from arene, preferably cg~c*ιg arene' such as benzene, toluene, xylene, mesitylene, naphthalene, and the like, which may be substituted by one or more, preferably one or two suitable substituents such as halogen as mentioned above, lower alkoxy (e.g. methoxy, ethoxy, propoxy, isobutoxy, butoxy, etc. ) , and the like. Suitable example thereof may be 1,2-phenylene, 1,3-phenylene, 1,4-phenylene, 5-methyl-1,3-phenylene, 2,3-dimethyl-l,4-phenylene, 1,2-naphthylene,
3-fluoro-l,4-phenylene, and the like, and more preferably 1,4-phenylene or 1,3-phenylene.
Suitable "a bivalent radical derived from imidazopyridine" may be imidazo[l,5-a]pyridin-diyl such as imidazo[l,5-a]pyridin-l,3-diγl, and the like.
Suitable "a bivalent radical derived from azulene" may be azulen-diyl such as azulen-l,3-diyl, and the like. Suitable "a bivalent radical derived from thiophene" may be thien-diyl such as thien-2,5-diyl, and the like. Suitable "a bivalent radical derived from pyrrolo[2,3-b]pyridine" may be lH-pyrrolo[2,3-b]pγridin-diyl such as lH-pyrrolo[2,3-b]pyridin-l,3-diγl, and the like.
Suitable "a bivalent radical derived from guinolone" may be 4-(lH)-quinolon-diyl such as 4- ( lH) -guinolon-l , 3-diyl, and the like.
Suitable "a bivalent radical derived from indazole" may be lH-imidazol-diyl such as lH-indazol-l,3-diyl, and the like. Suitable "a bivalent radical derived from dihydrobenzimidazole" may be 2,3-dihydro-lH-benzimidazol-diyl such as 2,3-dihγdro-lH-benzimidazol-l,3-diyl, and the like.
The bivalent radicals mentioned above may be substituted by one or more, preferably one to three suitable substituent(s) such as aryl (e.g. phenyl, tolyl, xylyl, naphthyl, etc. ) , lower alkyl as mentioned above, halogen as mentioned above, hydroxy, lower alkoxy (e.g. methoxy, ethoxy, propoxy, isopropoxy, etc.), and the like. Suitable "halogen" may be the same as those given in the above.
Suitable "protected hydroxy" may be lower alkyl, ar(lower)alkyl and acyloxy explained above, and the like.
The processes 1 and 2 for preparing the object compound (I) of the present invention are explained in detail in the following.
Process 1 The object compound (I) or a salt thereof can be prepared by reacting the compound (II) or a salt thereof with the compound (III) or its reactive derivative at the hydroxy group, or a salt thereof.
Suitable salt of the compounds (II) and (III) or its reactive derivative at the hydroxy group may be the same that exemplified for the compound (I) .
Suitable "reactive derivative at the hydroxy group" of the compound (III) may include an acid residue such as halo (e.g. bromo, chloro, iodo, etc.), acyloxy (e.g. acetoxy, mesyloxy, tosyloxy, etc.), and the like. This reaction is usually carried out in a solvent such as chloroform, dichloromethane, benzene,
N,N-dimethylformamide, dimethyl sulfoxide, tetrahydrofuran, diethyl ether or any other solvent which does not adversely affect the reaction.
The reaction may be carried out in the presence of an inorganic or an. organic base such as an alkali metal hydroxide [e.g. sodium hydroxide, potassium hydroxide, etc.], an alkali metal carbonate [e.g. sodium carboante, potassium carbonate, etc.], an alkali metal bicarbonate
[e.g. sodium bicarbonate, potassium bicarbonate, etc.], alkali metal hydride (e.g. sodium hydride, potassium hydride, etc. ) , tri(lower)alkylamine [e.g. trimethylamine, triethylamine, diisopropylethylamine , etc. ], pyridine or its derivative [e.g. picoline, lutidine,
4-dimethylaminopyridine, etc. ], or the like. In case that the base to be used is liquid, it can also be used as a solvent.
Also, this reaction can be carried out in the presence of a conventional condensing agent which is capable of condensing alcohols and amines.
The reaction temperature is not critical, and the reaction can be carried out under cooling, at room temperature or under warming or heating.
Process 2
The object compound (l-b) or a salt thereof can be prepared by subjecting the compound (I-a) or a salt thereof to removal reaction of the carboxy-protective ι group in R cL.
Suitable salt of the compounds (I-a) and (l-b) may be the same as that exemplified for the compound (I) .
In the present removal reaction, and conventional methods used in the removal of the carboxy-protective group, for example, hydrolysis, reduction, removal using Lewis acid, etc. are applicable. When the carboxy-protective group is an ester, it can be removed by hydrolysis or removal using Lewis acid. The hydrolysis is preferably carried out in the presence of a base or an acid.
Suitable base may include, for example, an inorganic base such as alkali metal hydroxide (e.g. sodium hydroxide, potassium hydroxide, etc.), alkaline earth metal hydroxide (e.g. magnesium hydroxide, calcium hydroxide, etc.), alkali metal carbonate (e.g. sodium carbonate, potassium carbonate, etc.), alkaline earth metal carboante (e.g. magnesium carbonate, calcium carbonate, etc.), alkali metal bicarbonate (e.g. sodium bicarbonate, potassium bicarbonate, etc.), alkali metal acetate (e.g. sodium acetate, potassium acetate, etc.), alkaline earth metal phosphate (e.g. magnesium phosphate, calcium phosphate, etc. ) , alkali metal hydrogen phosphate (e.g. disodium hydrogen phosphate, dipotassium hydrogen phosphate, etc.), and the like. The hydrolysis using a base is often carried out in water or a hydrophilic organic solvent or a mixed solvent thereof.
Suitable acid may include an organic acid (e.g. formic acid, acetic acid, propionic acid, benzoic acid etc. ) and an inorganic acid (e.g. hydrochloric acid, hydrobromic acid, sulfuric acid, etc.).
The present hydrolysis is usually carried out in an organic solvent such as alcohol (e.g. methanol, ethanol, etc.), tetrahydrofuran, N,N-dimethylformamide, water or a mixed solvent thereof.
The reaction temperature is not critical, and its may suitably be selected in accordance with the kind of the carboxy-protective group and the removing method. The removal using Lewis acid is preferably to remove substituted or unsubstituted ar(lower)alkyl ester and carried out by reacting the compound (I-a) or a salt thereof with Lewis acid such as boron trihalide (e.g. boron trichloride, boron trifluoride, etc. ) , titanium tetrahalide (e.g. titanium tetrachloride, titanium tetrabromide, etc.), tin tetrahalide (e.g. tin tetrachloride, tin tetrabromide, etc. ) , aluminum halide (e.g. aluminum chloride, aluminum bromide, etc.), trihaloacetic acid (e.g. trichloroacetic acid, trifluoroacetic acid, etc.) or the like. This removal reaction is preferably carried out in the presence of cation trapping agents (e.g. anisole, phenol, etc.) and is usually carried out in a solvent such as nitroalkane (e.g. nitromethane, nitroethane, etc.), alkylene halide (e.g. methylene chloride, ethylene chloride, etc. ) , diethyl ether, carbon disulfide or any other solvent which does not adversely affect the reaction. These solvents may be used as a mixture thereof.
The reduction can be applied preferably for removing the protective-group such as halo(lower)alkyl (e.g. 2-iodoethγl, 2,2,2-trichloroethyl, etc.) ester, ar(lower)alkyl (e.g. benzyl, etc.) ester or the like. The reduction method applicable for the removal reaction may include, for example, reduction by using a combination of a metal (e.g. zinc, zinc amalgam, etc.) or a salt of chromium compound (e.g. chromous chloride, chromous acetate, etc. ) and an organic or an inorganic acid (e.g. acetic acid, propionic acid, hydrochloric acid, etc. ) ; and conventional catalytic reduction in the pressure of a conventional metallic catalyst (e.g. Palladium carbon, Raney nickel, etc.).
The reaction temperature is not critical, and the reaction is usually carried out under cooling, at ambient temperature or under warming. The object compound (I) thus prepared can be iolated and purified in a conventional manner, for example, extraction, precipitation, fractional crystallization, recrystallization, chromatography, and the like.
The object compound (I) of the present invention can be converted to its salt by a conventional method.
The optically active compound can be prepared by a conventional optical resolution method or by selecting the optical active starting compound.
The starting compound (II) can be prepared by the following methods, the details of which are shown in Preparations mentioned below, or a conventional manner.
Method A
Z -CO-X-Ya (V)
R1-A-H R -A-CO-X-Ya
Lewis Acid
(IV) (VI) or a salt thereof or a salt thereof
Method B
Method C
H-X-Ya
(IX) (VI) or a salt thereof or a salt thereof
Method D
Removal of the carboxy-protective group
ITcL-A-CO-X-Ya Rj-A-CO-X-Ya
(VI-a) (Vl-b) or a salt thereof or a salt thereof
Method E
Reduction
R -A-CO-X-NO, R -A-CO-X-ΝH,
(VI-c) (III-a) or a salt thereof or a salt thereof
Method F
Removal of the hydroxy-protective group in Yb
R -A-CO-X-Yb R -A-CO-X-OH
(VI-d) (Ill-b) or a salt thereof or a salt thereof wherein R1, Rg1, R,1, A and X are each as defined above, Z 1, Z? and Z3 are each hydrogen,
Ya is nitro or protected hydroxy, and
Yb is protected hydroxy.
Methods A, B and C can be carried out in a conventional manner.
The object compound (I) of the present invention is useful as a testosteron 5α-reductase inhibitor and effective to testosteron 5α-reductase-mediated diseases such as prostatomegaly, prostatism, prostatic cancer, alopecia, hirsutism (e.g. female hirsutism, etc.), androgenic alopecia (or male-pattern baldness), acne (e.g. acne vulgaris, pimple etc.), other hyperandrogenism, and the like.
In order to illustrate the usefulness of the object compounds (I) , pharmacological activity of representative compounds of the present invention is shown below.
[1] Test compound :
4-[3-[4-[Bis(4-isobutylphenyl)methylamino]benzoyl]- imidazo[1,5-a]pyridin-l-yl]butyric acid
[2] Inhibitory activity on testosterone 5α-reductase in rats :
Test Methods i) Materials
3 1,2,6,7- H-Testosterone (85-105 Ci/mmol) : 3 1,2,6,7- H-Testosterone (85-105 Ci/mmol) is a mixture 3 of 1,2,6,7- H-testosterone and testosterone which 3 includes 85-105 Ci of 1,2,6,7- H-testosterone per mmol of testosterone and is purchased from New
England Nuclear, Boston, Mass., U.S.A..
Aquazol-2 (Aquazol-2-Universal LSC Cocktail) : trademark, purchased from New England Nuclear, Boston, Mass., U.S.A.
ii) Preparation of prostatic testosterone 5α-reductase
Mature Spraque-Dawley male rats (7-8 weeks old) were sacrificed by diethyl ether. The ventral prostates were dissected to be free of their capsules and their combined volume was measured by displacement in several milliliters of ice-cold medium A (0.32 M sucrose, 0.1 mM dithiothreitol and 20 mM sodium phosphate, pH 6.5). Unless specified, all the following procedures were carried out at 0-4°C. -The prostates were drained, minced, and then homogenized in 3-4 tissue volumes of medium A with Pyrex-glass homogenizer. The homogenate was fractioned by differential centrifugations at 3,000 g for 15 minutes. The resulting pellets were resuspended in medium A. The suspension (20-30 mg protein/ml) was stored at -80°C.
iii) Testosterone 5α-reductase assay
The reaction solution contains 1 mM dithiothreitol,
40 mM sodium phosphate pH 6.5, 50 μM NADPH, 1,2,6,7- 3H-testosterone/testosterone (2.2 x 10-9 M) and the suspension prepared above (0.8 mg of protein) in a total volume of 565 μl. Test Compound was added in 10 μl of 10% ethanol whereas control tubes received the same volume of 10% ethanol. The reaction was started with the addition of the enzyme suspension. After incubation at 37°C for 30 inut :-, the reaction was extracted with 1 ml of ethyl acetate. Fifty μl of ethyl acetate phase was chromatographed on a Merck silica plastic sheet Kieselgel 60 F254, using ethyl acetate : cyclohexane (1:1) as the developing solvent system. The plastic sheet was air dried and cut the testosterone and the 5α-dihydrotestosterone areas. The radioactivity was counted in 5 ml of Aquazol-2 in Packard scintillation counter (PACKARD TRI - CARB 4530), and an inhibitory ratio was calculated.
[3] Test Results :
For therapeutic or preventive administration, the object compound (I) or a pharmaceutically acceptable salt of the present invention is used in the form of conventional pharmaceutical preparation which contains said compound as an active ingredient, in admixture with pharmaceutically acceptable carriers such as an organic or inorganic solid or liquid excipient which is suitable for oral, parenteral, external and topical administration. The pharmaceutical preparation may be in solid or semi-solid from such as tablet, granule, powder, capsule, suppository, cream, ointment, or liquid form such as solution, suspension, syrup, emulsion, lemonade, lotion and the like.
If needed, there may be included in the above preparations auxiliary substances, stabilizing agents, wetting agents and other commonly used additives such as lactose, citric acid, tartaric acid, stearic acid, magnesium stearate, terra alba, sucrose, corn starch, talc, gelatin, agar, pectin, peanut oil, olive oil, cacao butter, ethylene glycol, and the like. While the dosage of the compound (I) may very from and also depend upon the age, conditions of the patient, a kind of diseases, a kind of the compound (I) to be applied, etc. In general amounts between 0.01 mg and about 500 mg or even more per day may be administered to a patient. An average single dose of about 0.05 mg, 0.1 mg, 0.25 mg, 0.5 mg, 1 mg, 20 mg, 50 mg, 100 mg of the object compound (I) of the present invention may be used in treating diseases.
The following Preparations and Example are given for the purpose of illustrating the present invention.
to be continued on the next page
Preparation 1
(1) To a solution of 2-(aminomethyl)pyridine (1.74 g) in pyridine (5 ml) was added glutaric anhydride (1.84 g) at ambient temperature. After stirring for 2 hours, the resulting solid was collected and washed with dichloromethane to give 4-[N-(2-pyridylmethyl)carbamoyl]- butyric acid (3.38 g) .
1H-NMR (DMSO-dg, δ) : 1.55 (2H, m), 2.15-2.3 (4H, ), 4.32 (2H, d, J=6Hz), 7.15-7.3 (2H, m) , 7.75 (1H, dt, J=2, 8Hz), 8.35-8.55 (2H, m)
(2) To a suspension of 4-[N-(2-pyridylmethyl)carbamoyl]- butyric acid (3.38 g) in ethanol (100 ml) was added camphorsulfonic acid (3.8 g) . After 10 minutes, the mixture was heated under reflux using a reflux condenser o containing 3A molecular sieves. After 3 hours, the mixture was evaporated, diluted with saturated aqueous sodium hydrogencarbonate and then extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate and evaporated in vacuo to give ethyl 4-[N-(2-pyridylmethyl)carbamoyl]butyrate (3.22 g) .
■"•H-NMR (CDC13, δ) : 1.25 (3H t, J=7Hz) , 2.01 (2H, m), 2.3-2.5 (4H, m) , 4.13 (2H, q, J=7Hz), 4.59 (2H, d, J=2Hz), 6.95 (1H, m) , 7.2-7.4 (2H, m) , 7.75 (1H, dt, J=l, 7Hz), 8.57 (1H, m)
(3) A solution of ethyl 4-[N-(2-pyridylmethyl)carbamoyl]- butyrate (692 mg) and phosphorus oxychloride (1.4 ml) in benzene (5 ml) were heated under reflux for 5 hours. Water was then added to the cooled mixture, and the resulting solution was made basic and extracted with ether. The separated organic layer was washed with brine, dried over sodium sulfate and evaporated in vacuo. The residue was chromatographed on silica gel (eluent : ethyl acetate to give ethyl 4-(imidazo[l,5-a]pyridin-3-yl)- butyrate (638 mg) .
1H-NMR (CDC13, δ) : 1.25 (3H, t, J=7Hz), 2.26 (2H, m), 2.48 (2H, t, J=7Hz), 3.11 (2H, t, J=7Hz), 4.14 (2H, q, J=7Hz), 6.55-6.8 (2H, m) , 7.48 (1H, s), 7.43 (1H, dt, J=9, 1Hz) , 7.88 (1H, dd,
J=7Hz)
Preparation 2
(1) To a solution of (2-carboxyethyl)triphenylphosphonium chloride (6.87 g) in dimethylformamide (20 ml) was added sodium hydride (1.48 g, 60% in mineral oil) at ambient temperature. After 20 minutes, l-formylimidazo[l,5-a]- pyridine (2.46 g) was added thereto and the mixture was stirred at 30°C for 1 hour. Ice was added to the mixture, followed by acidifying it to pH 5 with IN hydrochloric acid, and then extraction with ethyl acetate. The organic layer was washed with brine, dried and evaporated. The residue was chromatographed on silica gel (eluent : a mixture of chloroform and methanol, 9:1) to give 4-(imidazo[l,5-a]pyridin-l-yl)-trans-3-butenoic acid (613 mg) .
•^J-N R (DMSO-dg, δ) : 3.20 (2H, dd, J=l, 7Hz) , 6.32 (1H, dt, J=16, 7Hz), 6.63 (1H, dt, J=l, 7Hz), 6.74 (1H, d, J=16Hz), 6.78 (1H, m) , 7.65 (1H, d, J=9Hz), 8.27 (1H, d, J=7Hz), 8.33 (1H, s)
(2) To a solution of 4-(imidazo[l,5-a]pyridin-l-yl)- trans-3-butenoic acid (1.91 g) in ethanol (100 ml) was added camphorsulfonic acid (2.4 g) , and the mixture was o heated under reflux using reflux condenser containing 3A molecular sieves. After 2 hours, the mixture was evaporated, diluted with saturated aqueous sodium hydrogencarbonate, and then extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate and, evaporated in vacuo. The residue was chromatographed on silica gel (eluent : ethyl acetate) to give ethyl 4-(imidazo[l,5-a]pyridin-l-yl)-trans-3- butenoate (1.2 g) .
■"-H-NMR (CDC13, δ) : 1.28 (3H, t, J=7Hz) , 3.30 (2H, dd, J=l, 7Hz), 4.18 (2H, q, J=7Hz), 6.4-6.6 (2H, m), 6.65-6.8 (2H, m) , 7.49 (1H, d, J=9Hz), 7.85 (1H, d, J=7Hz), 8.04 (1H, s)
(3) To a solution of ethyl 4-(imidazo[l,5-a]pyridin-l- yl)-trans-3-butenoate (1.2 g) in ethanol (5 ml) was added 10% palladium on carbon (200 mg) , and the mixture was stirred for 2 hours under hydrogen atmosphere (4 atm) . The reaction mixture was filtered through a celite pad, and removal of the solvent from the filtrate in vacuo gave ethyl 4-(imidazo[1,5-a]pyridin-l-yl)butyrate (1.05 g) .
1H-NMR (CDC13, δ) : 1.24 (3H, t, J=7Hz) , 2.10 (2H, m), 2.36 (2H, t, J=7Hz), 2.94 (2H, t, J=7Hz), 4.12 (2H, q, J=7Hz), 6.50 (1H, dt, J=l,7Hz), 6.63 (1H, m), 7.38 (1H, d, J=9Hz), 7.87 (1H, d, J=7Hz), 8.12 (1H, s)
Preparation 3
(1) To a stirred solution of ethyl succinyl chloride (836 mg) in dichloromethane (30 ml) was added aluminum chloride (831 mg) at ambient temperature. After 10 minutes, a solution of azulene (503 mg) in dichloromethane was added. After one hour, ice was added thereto, and the mixture was extracted with chloroform. The organic layer was washed with water, aqueous sodium hydrogencarbonate and brine, dried over sodium sulfate and then evaporated in vacuo. The residue was chromatographed on silica gel to give ethyl 4-(azulen-l-yl)-4-oxobutyrate (422 mg) .
1H-NMR (CDC13, δ) : 1.28 (3H, t, J=7Hz) , 2.81 (2H, t, J=7Hz), 3.48 (2H, t, J=7Hz) , 4.18 (2H, q, J=7Hz), 7.29 (1H, d, J=4Hz), 7.49 (1H, t. J=9Hz ) , 7 . 60 ( 1H, t , J=9Hz ) , 7. 83 ( 1H, t, J=9Hz ) , 8. 37 ( 1H, d, J=4Hz ) , 8.50 ( 1H, d, J=9Hz ) , 9. 88 ( 1H, d, J=9Hz )
(2) To a stirred solution of ethyl 4-(azulen-l-yl)-4- oxobutyrate (206 mg) in tetrahydrofuran (3 ml) was added 1M tetrahydrofuran solution of diborane (1.37 ml) at 0°C. After stirring at ambient temperature for 20 minutes and 50°C for additional 20 minutes, the reaction was quenched by aqueous potassium dihydrogen phosphate at 0°C. The reaction mixture was extracted with ether. The separated organic layer was washed with aqueous sodium hydrogencarbonate and brine, dried over sodium sulfate and evaporated in vacuo. The residue was chromatographed on silica gel (eluent : a mixture of hexane and ethyl acetate, 2:1) to give ethyl 4- azulen-1-yl)butyrate (96 mg) .
1H-NMR (CDC13, δ) : 1.25 (3H, t, J=7Hz) , 2.08 (2H, m) , 2.36 (2H, t, J=7Hz), 3.12 (2H, t, J=7Hz) , 4.11 (2H, q, J=7Hz), 7.08 (2H, m) , 7.34 (1H, br s), 7.54 (1H, t, J=9Hz), 7.79 (1H, br s), 8.27 (2H, m)
Preparation 4 To a solution of 3-nitrobenzoyl chloride (713 mg) in 1,2-dichloroethane (5 ml) was added aluminum chloride (650 mg) . After 10 minutes, ethyl 4-(imidazo[l,5-a]pyridin- 3-yl)butyrate (405 mg) in 1,2-dichloroethane (5 ml) was added thereto. The resultant mixture was heated under reflux for 6 hours. The mixture was diluted with ethyl acetate and then washed with water, saturated aqueous sodium hydrogencarbonate, and brine. The solution was dried over sodium sulfate, and the solvent was removed by evaporation in vacuo. The residue was chromatographed on silica gel (eluent : a mixture of hexane and ethyl acetate, 1:2) to give ethyl 4-[l-(3-nitrobenzoyl)imidazo- [l,5-a]pyridin-3-yl]butyrate (240 mg) .
1H-NMR (CDC13, δ) : 1.27 (3H, t, J=7Hz) , 2.24 (2H, m), 2.59 (2H, t, J=7Hz), 3.14 (2H, t, J=7Hz) , 4.16 (2H, t, J=7Hz), 6.99 (1H, dt, J=l, 7Hz),
7.32 (1H, m), 7.68 (1H, t, J=8Hz), 8.16 (1H, ) , 8.38 (1H, m), 8.55 (1H, dt, J=l, 8Hz), 8.72 (1H, ) , 9.43 (1H, m)
The compounds described in the following Preparations 5 to 11 could be obtained in accordance with a similar manner to that of Preparation 4.
Preparation 5 Ethyl 4-[l-(4-nitrobenzoyl)imidazo[l,5-a]pyridin-3- yl] utyrate
■^i-NMR (CDC13, δ) : 1.27 (3H, t, J=7Hz), 2.20 (2H, m), 2.55 (2H, t, J=7Hz), 3.13 (2H, t , J=7Hz), 4.15 (2H, q, J=7Hz) , 7.00 (1H, dt, J=l, 7Hz), 7.34 (1H, ddd, J=l, 7, 9Hz), 8.18 (1H, dt, J=7,
1Hz), 8.33 (2H, m) , 8.5-8.6 (3H, m)
Preparation 6
Ethyl 4-[3-(3-nitrobenzoyl)imidazo[1,5-a]pyridin-l- yl]butyrate
" -I-NMR (CDC13, δ) : 1.25 (3H, t, J=7Hz), 2.19 (2H, m), 2.48 (2H, t, J=7Hz), 3.04 (2H, t, J=7Hz), 4.14 (2H, q, J=7Hz) , 7.11 (1H, dt, J=7.lHz), 7.28 (1H, m), 7.70 (1H, t, J=8Hz), 7.76 (1H, m) , 8.51 (1H, m), 8.79 (1H, dt, J=8Hz), 9.41 (1H, m), 9.86 (1H, dt, J=7, 1Hz)
Preparation 7
Ethyl 4-[3-(4-nitrobenzoyl)imidazo[1,5-a]pyridin- 1-yl]butyrate ■"•H-NMR (CDC13, δ) : 1.25 (3H, t, J=7Hz), 2.17 (2H, m), 2.47 (2H, t, J=7Hz), 3.04 (2H, t, J=7Hz) , 4.14 (2H, q, J=7Hz), 7.11 (IH, dt, J=7flHz), 7.29 (IH, m), 7.77 (IH, dt, J=9;lHz), 8.36 (2H, • d, J=9Hz), 8.60 (2H, d, J=9Hz), 9.87 (IH, dt,
J=7 j 1Hz )
Preparation 8
Ethyl 4-[3-(3-nitrobenzoyl)azulen-1-yl]butyrate 1H-NMR (CDC13, δ) : 1.22 (3H, t, J=7Hz), 2.05 (2H, m), 2.38 (2H, t, J=7Hz), 3.09 (2H, t, J=7Hz), 4.11 (2H, q, J=7Hz), 7.58 (IH, t, J=9Hz), 7.68 (IH, d, J=9Hz), 7.72 (IH, t, J=9Hz) , 7.85 (IH, s), 7.90 (IH, t, J=9Hz), 8.17 (IH, m) , 8.42 (IH, m), 8.53 (IH, d, J=9Hz), 8.57 (IH, m) , 9.71 (IH, d, J=9Hz)
Preparation 9
Ethyl 4-[3-(4-nitrobenzoyl)azulen-1-yl]butyrate -"Ή-N R (CDC13, δ) : 1.22 (3H, t, J=7Hz) , 2.05 (2H, m), 2.37 (2H, t, J=7Hz), 3.08 (2H, t, J=7Hz), 4.11 (2H, q, J=7Hz), 7.58 (IH, t, J=9Hz), 7.68 (IH, t, J=9Hz), 7.81 (IH, s), 7.90 (IH, m) , 7.96 (2H, d, J=8Hz), 8.38 (2H, d, J=8Hz) , 8.53 (IH, d, J=9Hz), 9.77 (IH, d, J=9Hz)
Preparation 10
Ethyl 4-[1-(4-methoxybenzoyl)imidazo[1,5-a]pyridin-3- yl]butyrate 1H-NMR (CDC13, δ) : 1.27 (3H, t, J=7Hz), 2.21 (2H, m) , 2.55 (2H, t, J=7Hz), 3.13 (2H, t, J=7Hz), 3.90 (3H, s), 4.15 (2H, q, J=7Hz), 6.88 (IH, dt, J=l, 7Hz), 7.00 (2H, d, J=9Hz) , 7.19 (IH, m) , 8.07 (IH, dt, J=7, 1Hz), 8.49 (2H, d, J=9Hz) , 8.45-8.55 (IH, m) Preparation 11
Ethyl 4-[1-(3-methoxybenzoyl)imidazo[1,5-a]pyridin-3- yl]butyrate
■"■H-NMR (CDC13, δ) : 1.26 (3H, t, J=7Hz) , 2.21 (2H, ), 2.55 (2H, t, J=7Hz), 3.12 (2H, t, J=7Hz), 3.90 (3H, s), 4.15 (2H, q, J=7Hz), 6.92 (IH, dt, J=7, 1Hz), 7.10 (IH, ), 7.23 (IH, m) , 7.41 (IH, t, J=8Hz), 7.95 (IH, m), 8.03 (IH, m) , 8.10 (IH, ), 8.51 (IH, m)
Preparation 12
To a solution of ethyl 4-[l-(3-nitrobenzoyl)imidazo- [l,5-a]pyridin-3-yl]butyrate in ethanol (10 ml) was added 4N sodium hydroxide (1.9 ml) , and the mixture was heated under reflux for 40 minutes. After removal of the organic solvent in vacuo, the resulting aqueous solution was made acidic with saturated aqueous potassium dihydrogen phosphate and extracted with ethyl acetate. The organic layer was washed with brine and dried over sodium sulfate. The solvent was removed in vacuo to give
4-[1-(3-nitrobenzoyl)imidazo[1,5-a]pyridin-3-yl]butyric acid (638 mg) .
■""H-NMR (DMSO-dg, δ) : 2.05 (2H, m) , 2.48 (2H, t,
J=7Hz), 3.13 (2H, t, J=7Hz), 7.17 (IH, dt, J=l, 7Hz), 7.52 (IH, dd, J=7, 9Hz), 7.84 (IH, t,
J=8Hz), 8.3-8.5 (2H, m) , 8.59 (IH, d, J=7Hz), 8.78 (IH, m) , 9.28 (IH, m)
Preparation 13 To a solution of 4-[l-(3-nitrobenzoyl)imidazo[l,5-a]- pyridin-3-yl]butyric acid (93 mg) in dioxane and ethanol (5 ml; 1:1) was added 10% palladi n on carbon (15 mg) , and the mixture was stirred for 3 hours under hydrogen atmosphere (4 atms) . The reaction mixture was then filtered through a celite pad. Removal of the solvent in vacuo gave 4-[l-(3-aminobenzoγl)imidazo[l,5-a]pyridin-3- yl]butyric acid (94 mg) .
1H-NMR (CDC13-CD30D, δ) : 2.23 (2H, m) , 2.56 (2H, t, J=7Hz), 3.13 (2H, t, J=7Hz) , 6.96 (IH, m) , 7.05-7.5 (3H, m) , 7.8 (IH, m) , 7.92 (IH, m) ,
8.13 (IH, m), 8.42 (IH, d, J=9Hz)
The compounds described in the following Preparations 14 to 16 could be obtained in accordance with a similar manner to that of Preparation 13.
Preparation 14
Ethyl 4-[l-(4-aminobenzoyl)imidazo[1,5-a]pyridin-3- yl]butyrate 1H-NMR (CDC13, δ) : 1.27 (3H, t, J=7Hz) , 2.20 (2H, m), 2.53 (2H, t, J=7Hz), 3.14 (2H, t, J=7Hz) , 4.15 (2H, q, J=7Hz) , 6.75 (2H, d, J=9Hz), 6.87 (IH, dt, J=l, 7Hz), 7.17 (IH, m) , 8.06 (IH, d, J=7Hz)Λ 8.37 (2H, d, J=9Hz), 8.48 (IH, dt, J=9, 1Hz)
Preparation 15
Ethyl 4-[3-(3-aminobenzoyl)imidazo[1,5-a]pyridin-l- yl]butyrate - l- (CDC13, δ) : 1.25 (3H, t, J=7Hz), 2.17 (2H, m), 2.47 (2H, t, J=7Hz), 3.03 (2H, t, J=7Hz), 4.15 (2H, q, J=7Hz), 6.89 (IH, m) , 7.01 (IH, dt, J=l, 7Hz), 7.16 (IH, m), 7.29 (IH, t, J=8Hz), 7.6-7.9 (3H, m), 9.92 (IH, dt, J=7Hz)
Preparation 16
Ethyl 4-[3-(4-aminobenzoyl)imidazo[1,5-a]pyridin-l- yl]butyrate
■ l-NMR (CDC13, δ) : 1.25 (3H, t, J=7Hz), 2.17 (2H, m), 2.44 (2H, t, J=7Hz), 3.03 (2H, t, J=7Hz), 4.13 (2H, q, J=7Hz), 6.72 (2H, d, J=9Hz), 6.92 (IH, dt, J=l, 7Hz), 7.09 (IH, m) , 7.64 (IH, dt, J=8, 1Hz), 8.42 (2H, d, J=9Hz), 9.76 (IH, dt, 3=1, 1Hz)
Preparation 17
To a stirred suspension of ethyl 4-[3-(3- nitrobenzoyl)azulen-l-yl]butyrate (200 mg) in ethanol (2.5 ml) and water (2 ml) was added iron powder (166 mg) and ferrous sulfate 7 hydrate (16 mg) , and the mixture was heated under reflux for an hour. The reaction mixture was cooled and extracted with chloroform. The organic layer was washed with water, aqueous sodium hydrogencarbonate and brine, and then evaporated in vacuo to give ethyl 4-[3-(3-aminobenzoyl)azulen-l-yl]butyrate (179 mg) .
1H-NMR (CDC13, δ) : 1.22 (3H, t, J=7Hz), 2.07 (2H, m), 2.36 (2H, t, J=7Hz), 3.08 (2H, t, J=7Hz), 4.10 (2H, q, J=7Hz), 6.88 (IH, m) , 7.1-7.35 (3H, m), 7.47 (IH, t, J=9Hz), 7.55 (IH, t, J=9Hz) , 7.81 (IH, t, J=9Hz), 7.99 (IH, s), 8.45 (IH, d,
J=9Hz), 9.62 (IH, d, J=9Hz)
Preparation 18
Ethyl 4-[3-(4-aminobenzoyl)azulen-l-γl]butyrate could be obtained in accordance with a similar manner to that of Preparation 17.
■"■H-NMR (CDC13, δ) : 1.23 (3H, t, J=7Hz), 2.08 (2H, m), 2.37 (2H, t, J=7Hz), 3.09 (2H, t, J=7Hz) , 4.12 (2H, q, J=7Hz), 6.73 (2H, d, J=8Hz) , 7.40 (IH, t, J=9Hz), 7.47 (IH, t, J=9Hz), 7.7-7.85
(IH, m), 7.76 (2H, t, J=8Hz), 7.99 (IH, s), 8.43 (IH, d, J=9Hz), 9.45 (IH, d, J=9Hz)
Preparation 19 To a solution of ethyl 4-[l-(4-methoxybenzoyl)- imidazo[1,5-a]pyridin-3-yl]butyrate in dichloromethane (10 ml) and ethanethiol (1.0 ml) was added aluminum chloride (1.5 g) at 0°C. After stirring for 40 minutes, the solvent was removed by evaporation and the residue was poured into ice. The resulting solid was collected,washed successively with water, ethanol and dichloromethane, and then dried in vacuum desicator to give ethyl 4-[1-( -hγdroxybenzoyl)imidazo[1,5-a]pyridin-3-yl]butyrate (618 mg) . " l-NMR (DMSO-dg, δ) : 1.16 (3H, t, J=7Hz), 2.07 (2H, m), 2.50 (2H, t, J=7Hz), 3.11 (2H, t, J=7Hz), 4.02 (2H, q, J=7Hz) , 6.87 (2H, d, J=9Hz), 7.04 (IH, dt, J=l, 7Hz), 7.33 (IH, m) , 8.35 (IH, d, J=9Hz), 8.38 (2H, d, J=9Hz), 8.48 (IH, d, J=7Hz)
Preparation 20
Ethyl 4-[1-(3-hydroxybenzoyl)imidazo[1,5-a]pyridin- 3-yl]butyrate could be obtained in accordance with a similar manner to that of Preparation 19. "hl-NMR (CDC13, δ) : 1.24 (3H, t, J=7Hz) , 2.18 (2H, m), 2.51 (2H, t, J=7Hz), 3.09 (2H, t, J=7Hz), 4.16 (2H, q, J=7Hz), 6.92 (IH, dt, J=l, 7Hz), 7.01 (IH, m), 7.24 (IH, m) , 7.36 (IH, t, J=8Hz), 7.77 (IH, d, J=7Hz), 8.05-8.15 (2H, m) , 8.52 (IH, d, J=9Hz)
Preparation 21
(1) A mixture of ethyl 3-(3-nitrophenyl)-3-oxopropionate (4.0 g), triethyl orthoformate (4.21 ml) and acetic anhydride (4.77 ml) was heated at 120°C for 4 hours. After evaporation of the solvent, the residue was chromatographed on silica gel eluting with a mixture of hexane and ethyl acetate (4:1) to give ethyl 2-(ethoxymethylene)-3-(3-nitrophenγl)-3-oxopropionate (3.73 g) as an oil. 1H-NMR (CDC13, δ) : 1.18 (3H, t, J=8Hz) , 1.28 (3H, t, J=8Hz), 4.15 (2H, q, J=8Hz) , 4.18 (2H, q, J=8Hz), 7.67 (IH, t, J=8Hz), 7.82 (IH, s) , 8.22 (IH, dt, J=8, 1Hz), 8.44 (IH, dt, J=8, 1Hz), 8.67 (IH, t, J=lHz)
(2) A mixture of ethyl 2-(ethoxymethylene)-3- (3-nitrophenyl)-3-oxopropionate (3.65 g) and aniline (1.13 ml) in chloroform (20 ml) was stirred at 25°C for 1 hour. The precipitated crystals were collected by filtration to give ethyl 3-(3-nitrophenyl)-3-oxo-2-
(phenylaminomethylene)propionate (3.4 g) .
1H-NMR (CDC13, δ) : 0.90 (2/3H, t, J=8Hz) , 1.06
(4/3H, t, J=8Hz), 4.00-4.14 (2H, ) , 7.20-7.64 (6H, m), 7.82 (2/3H, dt, J=8, 1Hz), 7.95 (3/1H, dt, J=8, 1Hz), 8.25-8.40 (2H, m) , 8.48 (1/3H, d,
J=14Hz), 8.66 (2/3H, d, J=14Hz)
(3) A solution of ethyl 3-(3-nitrophenyl)-3-oxo-2-
(phenylaminomethylene)propionate (1.0 g) in diphenyl ether (10 ml) was heated at 180°C for 4 hours, and the reaction mixture was allowed to cool to 25°C. The precipitates were collected by filtration to give
3- ( 3-nitrobenzoyl ) -4-quinolone ( 315 mg) .
■ -I-NMR ( DMSO-dg , δ ) : 7 . 47 ( IH, dt , J=2 , 8Hz ) , 7 . 68-7. 84 ( 3H, m) , 8 . 12 ( 2H , d , J=8Hz ) , 8.38-8.46 (2H, m) , 8.51 (IH, s)
Preparation 22
(1) Ethyl 2-(ethoxymethylene)-3-(4-nitrophenyl)- 3-oxopropionate could be obtained in accordance with a similar manner to that of Preparation 21-(1).
1H-NMR (CDC13, δ) : 1.15 (3H, t, J=8Hz), 1.28 (3H, t, J=8Hz), 4.04-4.22 (4H, m) , 8.02 (2H, d, J=10Hz), 8.30 (2H, d, J=10Hz)
(2) Ethyl 3-(4-nitrophenyl)-3-oxo-2-
(phenylaminomethylene)propionate could be obtained in accordance with a similar manner to that of Preparation 21-(2). ■'Ή-NMR (CDC13, δ) : 0.88 (3/3H, t, J=8Hz), 1.02
(6/3H, t, J=8Hz), 4.04 (2/3H, q, J=8Hz) , 4.06 (4/3H, q, J=8Hz), 7.20-7.34 (3H, m) , 7.45 (2H, q, J=8Hz), 7.60 (4/3H, d, J=10Hz), 7.75 (2/3H, d, J=10Hz), 8.26 (2H, d, J=10Hz), 8.50 (1/3H, d, J=16Hz), 8.66 (1/3H, d, J=16Hz)
(3) 3-(4-Nitrobenzoyl)-4-quinolone could be obtained in accordance with a similar manner to that of Preparation 21-(3). -"-H- (DMSO-dg, δ) : 7.47 (IH, dt, J=2, 8Hz), 7.19
(IH, dd, J=2, 8Hz), 7.76 (2H, dq, J=2, 8Hz), 7.88 (2H, d, J=10Hz), 8.12 (IH, d, J=8Hz), 8.30 (2H, d, J=10Hz), 8.52 (IH, s)
Preparation 23
A mixture of 3-(3-nitrobenzoyl)-4-quinolone (300 mg) , ethyl 4-bromobutyrate (0.29 ml) and potassium carbonate (423 mg) in N,N-dimethylformamide (10 ml) was stirred at 50°C for 4 hours. The reaction mixture was poured into a mixture of ethyl acetate and IN hydrochloric acid. The organic layer was separated, washed with water and brine, dried over magnesium sulfate, and evaporated. The residue was chromatographed on silica gel (30 g) eluting with a mixture of ethyl acetate and hexane (1:4) to give ethyl 4-[3-(3-nitrobenzoyl)-4-quinolon-l-yl]butyrate (358 mg) as yellow crystals.
1H-NMR (CDC13, δ) : 1.32 (3H, t, J=8Hz), 2.23-2.48 (2H, ), 2.53 (2H, t, J=8Hz), 4.22 (2H, q, J=8Hz), 4.38 (2H, t, J=8Hz), 7.50 (IH, dt, J=2, 8Hz), 7.64 (2H, t, J=8Hz), 7.70-7.85 (2H, m) ,
8.12 (2H, dd, J=2, 8Hz), 8.36-8.50 (3H, m) , 8.62 (IH, t, J=2Hz)
The compounds of the following Preparations 24 to 27 could be obtained by reacting the corresponding starting compounds with ethyl 4-bromobutyrate in accordance with a similar manner to that of Preparation 23.
Preparation 24 Ethyl 4-[3-(4-nitrobenzoyl)-4-quinolon-l-yl]butyrate ■"■H-NMR (CDC13, δ) : 1.30 (3H, t, J=8Hz), 2.20-2.35 (2H, m), 2.52 (2H, t, J=8Hz), 4.23 (2H, q, J=8Hz), 4.38 (2H, t, J=8Hz), 7.51 (IH, dt, J=2, 8Hz), 7.73-7.82 (2H, m) , 7.90 (2H, d, J=10Hz), 8.30 (2H, d, J=10Hz), 8.42 (IH, t, J=2Hz), 8.46
(IH, dd, J=2, 8Hz)
Preparation 25
Ethyl 4-[3-(3-nitrobenzoyl)-lH-pyrrolo[2,3-b]pyridin- 1-yl]butyrate
■"•H-NMR (CDC13, δ) : 1.20 (3H, t, J=8Hz), 2.20-2.44 (2H, ), 2.38 (2H, t, J=8Hz), 4.08 (2H, q, J=8Hz), 4.48 (2H, t, J=8Hz) , 7.35 (IH, dd, J=5, 8Hz), 7.73 (IH, s), 7.74 (IH, t, J=7Hz), 8.18 (IH, dd, J=l, 7Hz), 8.40-8.52 (2H, m) , 8.65-8.72
(2H, m) Preparation 26
Ethyl 4- ( 3 -carboxy-lH-indazol-1-yl ) butyrate 1H-NMR (DMSO-dg, δ) : 1.12 (3H, t, J=8Hz), 2.00-2.20 (2H, m), 2.32 (2H, t, J=8Hz), 3.97 (2H, q, J=8Hz), 4.56 (2H, t, J=8Hz), 7.23 (IH, t,
J=8Hz), 7.44 (IH, t, J=8Hz ) , 7.60 (IH, d, J=8Hz), 8.20 (IH, d, J=8Hz)
Preparation 27 Benzyl 4-[3-(l-methγlvinyl)-2,3-dihydro-2-oxo-lH- benzimidazol-1-yl]butyrate
■'Ή-NMR (CDC13, δ) : 2.05-2.21 (2H, m) , 2.24 (3H, d, J=lHz), 2.48 (2H, t, J=8Hz), 3.94 (2H, t, J=8Hz), 3.94 (2H, t, J=8Hz), 5.13 (2H, s), 5.19 (IH, s), 5.25 (IH, q, J=lHz), 6.96-7.14 (4H, m) ,
7.36 (5H, s)
Preparation 28
To a solution of benzyl 4-[3-(l-methylvinyl)-2,3- dihydro-2-oxo-lH-benzimidazol-l-yl)butyrate (980 mg) in tetrahydrofuran (10 ml) were added water (10 ml) and sulfuric acid (2 ml), and the mixture was stirred at 25°C for 2 hours. The reaction mixture was partitioned between ether and water. The organic layer was separated, washed with water and brine, and dried over magnesium sulfate. After evaporation of the solvent, the residue was chromatographed on silica gel eluting with 20% ethyl acetate in hexane to give benzyl 4-(2,3-dihydro-2-oxo-lH- benzimidazol-1-yl)butyrate (342 mg) as an oil. ^-N R (CDC13, δ) : 2.13 (2H, quintet, J=8Hz) , 2.49
(2H, t, J=8Hz), 3.96 (2H, t, J=8Hz), 5.12 (2H, s), 6.96-7.10 (4H, m) , 7.36 (5H, s)
Preparation 29 A solution of 3-nitrobenzyl chloride (230 mg) in dichloromethane (5 ml) was added to a mixture of benzyl 4-(2,3-dihγdro-2-oxo-lH-benzimidazol-l-yl)butyrate (320 mg), diisopropylethylamine (0.36 ml) and 4-(dimethylamino)pyridine (25 mg) in dichloromethane (10 ml) at 25°C. After stirred at 25°C overnight, the reaction mixture was poured into a mixture of ethyl acetate and IN hydrochloric acid. The organic layer was separated, washed with water and brine, and dried over magnesium sulfate. After evaporation of the solvent, the residue was chromatogrpahed on silica gel eluting with 20% ethyl acetate in hexane to give benzyl
4-[3-(3-nitrobenzyl)-2,3-dihydro-2-oxo-lH-benzimidazol-l- yl]butyrate (331 mg) as an oil.
1H-NMR (CDC13, δ) : 2.10 (2H, quin, J=8Hz), 2.47 (2H, t, J=8Hz), 3.89 (2H, t, J=8Hz) , 5.08 (2H, s), 7.04 (IH, dd, J=l, 8Hz), 7.20-7.30 (2H, m) , 7.35 (5H, s), 7.67 (IH, t, J=8Hz), 8.02-8.08 (2H, m), 8.40-8.46 (IH, m) , 8.58 (IH, t, J=lHz)
Preparation 30
(1) To a solution of ethyl 4-(3-carboxy-lH-indazol-l-yl)- butyrate (990 mg) in dichloromethane (20 ml) were added oxalyl chloride (0.33 ml) and N,N-dimethylformamide (1 drop), and the mixture was stirred at 25°C for 2 hours. Evaporation of the solvent gave ethyl 4-[3-(chloroformyl)- lH-indazol-l-yl]butyrate (1.02 g) as yellow solid, which was used for the next step without further purification.
(2) To a solution of ethyl 4-[3-(chloroformyl)-lH- indazol-1-yl]butyrate (350 rag) in anisol (10 ml) was added aluminum chloride (475 mg) at 25°C, and the mixture was stirred at the same temperature for 30 minutes. The reaction mixture was poured into a mixture of ethyl acetate and IN hydrochloric acid. The organic layer was separated, washed with water and brine, and dried over magnesium sulfate. After evaporation of the solvent, the residue was chromatographed on silica gel eluting with a mixture of ethyl acetate and hexane (1:4) to give ethyl 4-[3-(4-methoxybenzoyl)-lH-indazol-l-yl]butyrate (224 mg) as an oil.
" ϊ-NMR (CDC13, δ) : 1.22 (3H, t, J=8Hz), 2.26-2.42
(4H, m), 3.91 (3H, s) , 4.13 (2H, q, J=8Hz), 4.58 (2H, t, J=8Hz), 7.03 (2H, d, J=9Hz), 7.30-7.56 (3H, m), 8.42 (2H, d, J=9Hz), 8.44 (IH, dd, J=l, 8Hz)
Preparation 31
3-(3-Nitrobenzoyl)-lH-pγrrolo[2,3-b]pyridine could be obtained by reacting lH-pyrrolo[2,3-b]pyridine with 3-nitrobenzoyl chloride in accordance with a similar manner to that of Preparation 4.
"h-I-NMR (DMSO-dg, δ) : 7.36 (IH, dd, J=5, 8Hz), 7.87 (IH, t, J=7Hz), 8.26 (IH, d, J=7Hz), 8.35-8.66 (5H, m)
The compounds of the following Preparations 32 to 35 could be obtained from the corresponding ethyl esters in accordance with a similar manner to that of Preparation 12.
Preparation 32
4-[3-(3-Nitrobenzoyl)-4-quinolon-l-yl]butyric acid 1H-NMR (DMSO-dg, δ) : 1.92-2.15 (2H, m) , 2.46 (2H, t, J=8Hz), 4.46 (2H, t, J=8Hz), 7.53 (IH, t, J=8Hz), 7.74 (IH, t, J=8Hz), 7.86 (2H, dt, J=l,
8Hz), 7.98 (IH, d, J=8Hz) , 8.15 (1HΛ dd, J=2, 8Hz), 8.23 (IH, dd, J=2, 8Hz), 8.38-8.46 (2H, m), 8.63 (IH, s) Preparation 33
4-[3-(4-Nitrobenzoyl)-4-quinolon-l-yl]butyric acid 1H- MR (CDC13:CD30D = 1:1, δ) : 2.12-2.38 (2H, m) , 2.45 (2H, t, J=8Hz), 4.38 (2H, t, J=8Hz), 7.45 (IH, dt, J=2, 8Hz), 7.70-7.85 (2H, m) , 7.85 (2H, d, J=10Hz), 8.22 (2H, d, J=10Hz), 8.35 (2H, dd, J=2, 8Hz), 8.45 (IH, s)
Preparation 34 4-[3-(4-Hydroxybenzoyl)-lH-indazol-l-yl]butyric acid •"■H-NMR (CDC13:CD30D = 1:1, δ) : 2.28-2.46 (4H, m) , 4.60 (2H, t, J=8Hz), 6.93 (2H, d, J=9Hz), 7.30-7.60 (3H, m) , 8.30 (2H, d, J=9Hz), 8.40 (IH, dd, J=l, 8Hz)
Preparation 35
4-[3-(3-Nitrobenzoyl)-lH-pyrrolo[2,3-b]pyridin-1-yl]- butyric acid
•"Ή-NMR (DMSO-dg, δ) : 2.0-2.40 (2H, m) , 2.26 (2H, t, J=8Hz), 4.38 (2H, t, J=8Hz), 7.38 (IH, dd, J=5,
8Hz), 7.88 (IH, t, J=8Hz), 8.28 (IH, dd, J=2, 8Hz), 8.42 (IH, s), 8.44-8.56 (3H, m) , 8.58 (IH, dd, J=2, 8Hz)
The compounds of the following Preparations 36 to 38 could be obtained by reducing the corresponding nitro compounds with palladium on carbon in accordance with a similar manner to that of Preparation 13.
Preparation 36
4-[3-(3-Aminobenzoyl)-4-quinolon-l-yl]butyric acid 1H-NMR (DMSO-dg, δ) : 1.92-2.10 (2H, m) , 2.38 (2H, t, J=8Hz), 4.40 (2H, t, J=8Hz), 6.78 (IH, dd, J=2, 8Hz), 6.92 (IH, d, J=8Hz), 6.98 (IH, t, J=2Hz), 7.10 (IH, t, J=8Hz) , 7.50 (2H, t, _ -ifi -
J=8Hz), 7.78-8.02 (2H, m) , 8.23 (2H, dd, J=2, 8Hz), 8.35 (IH, s)
Preparation 37
4-[3-(4-Aminobenzoyl)-4-quinolon-l-yl]butyric acid " l-NMR (DMSO-dg, δ) : 1.92-2.10 (2H, m) , 2.38 (2H, t, J=8Hz), 4.36 (2H, t, J=8Hz), 6.54 (2H, d, J=8Hz), 7.30-7.50 (IH, m) , 7.54 (2H, d, J=14Hz), 7.70-7.95 (3H, m) , 8.22 (IH, s)
Preparation 38
4-[3-(3-Aminobenzoyl)-lH-pyrrolo[2,3-b]pyridin-1-yl]■ butyric acid
1H-NMR (CDC13:CD30D = 1:1, δ) : 2.20-2.32 (2H, m) , 2.38 (2H, t, J=8Hz), 4.42 (2H, t, J=8Hz),
6.90-7.40 (5H, m) , 7.86 (IH, s), 8.40 (IH, dd, J=l, 5Hz), 8.65 (IH, dd, J=l, 8Hz)
Preparation 39 4-[3-(3-Aminobenzoyl)-2,3-dihydro-2-oxo-lH- benzimidazol-1-yl]butyric acid could be obtained by reducing benzyl 4-[3-(3-nitrobenzoyl)-2,3-dihydro-2-oxo- IH-benzimidazol-l-yl]butyrate with palladium on carbon in accordance with a similar manner to that of Preparation 13.
1H-NMR (DMSO-dg, δ) : 1.80-2.00 (2H, m) , 2.33 (2H, t, J=8Hz), 3.86 (2H, t, J=8Hz), 6.75-7.40 (7H, m), 7.68 (IH, dd, J=l, 8Hz)
Preparation 40
Ethyl 4-[3-(4-hydroxybenzoyl)-IH-indazol-l-ylJ- butyrate could be obtained in accordance with a similar manner to that of Preparation 19.
•'Ή-NMR (CDC13, δ) : 1.24 (3H, t, J=8Hz), 2.26-2.42 (4H, m), 4.15 (2H, q, J=8Hz) , 4.58 (2H, t, J=8Hz ) , 6 . 18 ( IH, s ) , 6 . 96 ( 2H , d, J=9Hz ) , 7 . 30-7. 56 ( 3H, m) , 8 . 35 ( 2H, d , J=9Hz ) , 8 . 45 ( 2H, dd, J=l , 8Hz )
Preparation 41
Ethyl 4-(thien-2-yl)butyrate could be obtained by reacting 4-(thien-2-yl)butyric acid with ethanol in accordance with a similar manner to that of Preparation 2-(2). 1H-NMR (CDC13, δ) : 1.26 (3H, t, J=7Hz), 2.01 (2H, m), 2.35 (2H, t, J=7Hz), 2.89 (2H, t, J=7Hz), 4.13 (2H, q, J=7Hz) , 6.79 (IH, m) , 6.92 (IH, dd, J=3, 5Hz), 7.12 (IH, dd, J=l, 5Hz)
Preparation 42
Ethyl 4-oxo-4-(3-phenylthien-2-yl)butyrate could be obtained by reacting 3-phenylthiophene with ethyl succinyl chloride in accordance with a similar manner to that of Preparation 3-(1) . •'Ή-NMR (CDC13, δ) : 1.21 (3H, t, J=7Hz), 2.58 (2H, m), 2.79 (2H, t, J=7Hz), 4.09 (2H, q, J=7Hz), 7.05 (IH, d, J=5Hz), 7.35-7.5 (5H, m) , 7.54 (IH, d, J=5Hz)
Preparation 43
To a stirred solution of HgCl2 (0.41 g) in cone. HC1 (0.2 ml) and water (5 ml) was added zinc dust (4.1 g) . After 10 minutes, the aqueous layer was decanted off. To the residue was added water (3 ml), cone. HC1 (5 ml), acetic acid (1 ml) and ethyl 4-oxo-4-(3-phenylthien-2-yl)- butyrate (514 mg) in toluene (5 ml), and the mixture was refluxed for 1.5 hours. After cooling, the reaction mixture was extracted with toluene. The combined organic layer were washed with water, aqueous sodium hydrogencarbonate and brine, dried over sodium sulfate and evaporated in vacuo. The residue was chromatographed on silica gel (hexane:dichloromethane = 1:1) to give ethyl 4-(3-phenylthien-2-yl)butyrate (249 mg) .
■"■H-NMR (CDC13, δ) : 1.22 (3H, t, J=7Hz), 1.85-2.1 (2H, m), 2.32 (2H, t, J=7Hz), 2.92 (2H, t,
J=7Hz), 4.08 (2H, q, J=7Hz), 7.00 (IH, d, J=5Hz), 7.18 (IH, d, J=5Hz), 7.2-7.5 (5H, m)
The compounds of the following Preparations 44 and 45 could be obtained by reacting the corresponding starting compounds with 3-nitrobenzoyl chloride in accordance with a similar manner to that of Preparation 4.
Preparation 44 Ethyl 4-[5-(3-nitrobenzoyl)thien-2-yl]butyrate
1H-NMR (CDC13, δ) : 1.28 (3H, t, J=7Hz), 2.08 (2H, m), 2.42 (2H, t, J=7Hz), 2.98 (2H, t, J=7Hz), 4.16 (2H, q, J=7Hz), 6.93 (IH, d, J=4Hz), 7.49 (IH, d, J=4Hz), 7.72 (IH, t, J=8Hz), 8.17 (IH, m), 8.43 (IH, m) , 8.68 (IH, m)
Preparation 45
Ethyl 4-[5-(3-nitrobenzoyl)-3-phenylthien-2-yl]- butyrate
1H-NMR (CDC13, δ) : 1.23 (3H, t, J=7Hz), 1.95-2.15 (2H, m), 2.36 (2H, , t, J=7Hz), 3.00 (2H, t, J=7Hz), 4.08 (2H, q, J=7Hz) , 7.3-7.5 (5H, m) , 7.53 (IH, s), 7.71 (IH, t, J=8Hz), 8.2 (IH, m) , 8.43 (IH, m) , 8.72 (IH, m)
The compounds of the following Preparations 46 and 47 could be obtained by reducing the corresponding nitro compound in accordance with a similar manner to that of Preparation 17. Preparation 46
Ethyl 4-[5-(3-aminobenzoyl)thien-2-yl]butyrate 1H-NMR (CDC13, δ) : 1.28 (3H, t, J=7Hz) , 2.05 (2H, m), 2.40 (2H, t, J=7Hz), 2.95 (2H, t, J=7Hz) , 4.15 (2H, q, J=7Hz) , 6.83-6.94 (2H, m) , 7.11 (IH, m), 7.15-7.3 (2H, m) , 7.51 (IH, d, J=4Hz)
Preparation 47
Ethyl 4-[5-(3-aminobenzoyl)-3-phenylthien-2-yl]- butyrate 1. H-NMR (CDC13, δ) : 1.21 (3H, t, J=7Hz) , 1.9-2.15 (2H, m), 2.34 (2H, t, J=7Hz), 2.98 (2H, t, J=7Hz), 4.08 (2H, q, J=7Hz) , 6.8-7.5 (9H, m) , 7.58 (IH, s)
to be continued on the next page
Example 1
To a solution of 4-[l-(3-aminobenzoyl)imidazo[l,5-a]- pyridin-3-yl]butyric acid (93 mg) in dichloromethane (6 ml) were added diisopropylethyl amine (0.12 ml) and bis(4-isobutylphenyl)chloromethane (109 mg) in dichloromethane (2 ml). After stirring overnight at ambient temperature, the reaction was quenched by saturated aqueous potassium dihydrogen phosphate and IN hydrochloric acid (0.29 ml). The mixture was extracted with dichloromethane. The organic layer was washed with brine, dried over sodium sulfate, and concentrated in vacuo. Thin layer chromatography of the concentrate with ethyl acetate furnished 4-[l-[3-[bis(4-isobutylphenyl)- methylamino]benzoyl]imidazo[1,5-a]pyridin-3-yl]butyric acid (77 mg) .
■4-I-NMR (CDC13, δ) : 0.84 (12H, d, J=7Hz), 1.81 (2H, m), 2.18 (2H, m) , 2.52 (4H, d, J=7Hz), 2.54 (2H, t, J=7Hz), 3.10 (2H, t, J=7Hz), 5.52 (IH, s), 6.7-6.9 (2H, m), 7.0-7.85 (10H, m) , 7.6-7.7 (2H, m), 7.98 (IH, d, J=7Hz), 8.40 (IH, d, J=8Hz)
The compounds described in the following Examples 2 to 8 could be obtained by reacting the corresponding starting compounds with bis(4-isobutγlphenyl)chloromethane in accordance with a similar manner to that of Example 1.
Example 2
Ethyl 4-[1-[4-[bis(4-isobutylphenyl)methylamino]- benzoyl]imidazo[1,5-a]pyridin-3-yl]butyrate ^-N R (CDC13, δ) : 0.88 (12H, d, J=7Hz), 1.25 (3H, t, J=7Hz), 1.85 (2H, m) , 2.18 (2H, m) , 2.45 (4H, d, J=7Hz), 2.51 (2H, t, J=7Hz), 3.09 (2H, t, J=7Hz), 4.13 (2H, q, J=7Hz) , 4.64 (IH, br d, J=4Hz), 5.59 (IH, br d, J=4Hz), 6.58 (2H, d, J=9Hz), 6.83 (IH, dt, J=l, 7Hz), 7.05-7.17 (5H, m) , 7.34 ( 4H, d, J=8Hz ) , 8. 02 ( IH, d, J=7Hz ) , 8 . 36 ( 2H, d , J=9Hz ) , 8 . 49 ( IH , d, J=9Hz )
Example 3 Ethyl 4-[3-[3-[bis(4-isobutylphenγl)methylamino]- benzoyl]imidazo[1,5-a]pyridin-l-γl]butyrate
^-NM (CDC13, δ) : 0.88 (12H, d, J=7Hz) , 1.24 (3H, t, J=7Hz), 1.83 (2H, m), 2.13 (2H, m) , 2.41 (2H, t, J=7Hz), 2.43 (4H, d, J=7Hz), 3.01 (2H, t, J=7Hz), 4.10 (2H, q, J=7Hz) , 5.57 (IH, s), 6.70
(IH, m), 6.96 (IH, dt, J=l, 7Hz), 7.09 (4H, d, J=8Hz), 7.0-7.3 (2H, m) , 7.27 (4H, d, J=8Hz), 7.55-7.75 (3H, m) , 9.76 (IH, d, J=7Hz)
Example 4
Ethyl 4-[3-[4-[bis(4-isobutylphenyl)methylamino]- benzoyl]imidazo[1,5-a]pyridin-1-yl]butyrate
•'"H-NMR (CDC13, δ) : 0.89 (12H, d, J=7Hz), 1.24 (3H, t, J=7Hz), 1.85 (2H, m) , 2.13 (2H, m) , 2.40 (2H, t, J=7Hz), 2.46 (4H,, d, J=7Hz), 3.0 (2H, t,
J=7Hz), 4.12 (2H, q, J=7Hz) , 4.70 (IH, br d, J=4Hz), 5.50 (IH, br d, J=4Hz), 6.60 (2H, d, J=9Hz), 6.89 (IH, dt, J=l, 7Hz), 7.06 (IH, m) , 7.10 (4H, d, J=8Hz), 7.23 (4H, d, J=8Hz), 7.62 (IH, dt, J=9, 1Hz), 8.38 (2H, d, J=9Hz), 9.72
(IH, d, J=7Hz)
Example 5
Ethyl 4-[3-[3-[bis(4-isobutylphenyl)methylamino]- benzoyl]azulen-l-yl]butyrate
■^- MR (CDC13, δ) : 0.85 (12H, d, J=7Hz), 1.20 (3H, t, J=7Hz), 1.81 (2H, m), 2.03 (2H, m) , 2.32 (2H, t, J=7Hz), 2.41 (4H, d, J=7Hz), 3.04 (2H, t, J=7Hz), 4.08 (2H, q, J=7Hz) , 5.51 (IH, s), 6.8-7.2 (4H, m) , 7.06 (4H, d, J=8Hz), 7.28 (4H, d, J=8Hz), 7.43 (IH, t, J=9Hz), 7.52 (IH, t, J=9Hz), 7.79 (IH, t, J=9Hz), 7.92 (IH, s), 8.43 (IH, d, J=9Hz), 9.60 (IH, d, J=9Hz)
Example 6
Ethyl 4-[3-[4-[bis(4-isobutylphenyl)methylamino]- benzoyl]azulen-1-yl]butyrate
■"-H-NMR (CDC13, δ) : 0.89 (12H, d, J=7Hz), 1.23 (3H, t, J=7Hz), 1.84 (2H, m), 2.06 (2H, m), 2.35 (2H, t, J=7Hz), 2.45 (4H, d, J=7Hz), 3.08 (2H, t,
J=7Hz), 4.11 (2H, q, J=7Hz), 4.68 (IH, br d, J=4Hz), 5.59 (IH, br d, J=4Hz), 6.60 (2H, d, J=8Hz), 7.11 (4H, d, J=8Hz), 7.25 (4H, d, J=8Hz), 7.38 (IH, t, J=9Hz), 7.43 (IH, t, J=9Hz), 7.73 (2H, d, J=8Hz), 7.68-7.8 (IH, m) ,
7.98 (IH, s), 8.41 (IH, d, J=9Hz), 9.41 (IH, d, J=9Hz)
Example 7 Ethyl 4-[l-[4-[bis(4-isobutylphenγl)methoxy]benzoyl]- imidazo[1,5-a]pyridin-3-yl]butyrate
■ i-N R (CDC13, δ) : 0.88 (12H, d, J=7Hz), 1.26 (3H, t, J=7Hz), 1.84 (2H, m), 2.17 (2H, m) , 2.44 (4H, d, J=7Hz), 2.51 (2H, t, J=7Hz), 3.09 (2H, t, J=7Hz), 4.13 (2H, q, J=7Hz), 6.28 (IH, s), 6.86
(IH, dt, J=l, 7Hz), 7.03 (2H, d, J=9Hz), 7.11 (4H, d, J=8Hz), 7.17 (IH, m) , 7.31 (4H, d, J=8Hz), 8.05 (IH, d, J=7Hz), 8.38 (2H, d, J=9Hz), 8.48 (IH, d, J=9Hz)
Example 8
Ethyl 4-[1-[3-[bis(4-isobutylphenyl)methoxy]benzoyl]- imidazo[1,5-a]pyridin-3-y1]butyrate
1H-NMR (CDC13, δ) : 0.87 (12H, d, J=7Hz), 1.26 (3H, t, J=7Hz), 1.83 (2H, m) , 2.17 (2H, m) , 2.42 (4H, d, J=7Hz), 2.53 (2H, t, J=7Hz) , 3.10 (2H, t, J=7Hz), 4.14 (2H, q, J=7Hz), 6.32 (IH, s), 6.88 (IH, dt, J=l, 7Hz), 7.09 (4H, d, J=8Hz), 7.05-7.4 (3H, m), 7.33 (4H, d, J=8Hz), 7.9-8.0 (2H, m), 8.09 (IH, d, J=7Hz), 8.46 (IH, dt, J=8,
1Hz)
Example 9
To a solution of ethyl 4-[l-[4-[bis(4- isobutylphenyl)methylamino]benzoyl]imidazo[1,5-a]pyridin- 3-yl]butyrate (120 mg) in ethanol (5 ml) was added IN sodium hydroxide (0.8 ml). After stirring for 40 minutes, the reaction mixture was evaporated in vacuo. To the residual solution were then added a solution of aqueous potassium dihydrogen phosphate (1 ml) and IN hydrochloric acid (0.8 ml), and extracted with ethyl acetate. The organic layer was dried over sodium sulfate. After evaporation of the solvent the residue was chromatographed on silica gel (eluent : ethyl acetate) to give 4-[l-[4- [bis(4-isobutylphenyl)methylamino]benzoyl]imidazo- [1,5-a]pyridin-3-yl]butyric acid (78 mg) .
• l-N R (CDC13, δ) : 0.88 (12H, d, J=7Hz), 1.83 (2H, m), 2.19 (2H, m) , 2.44 (4H, d, J=7Hz), 2.55 (2H, t, J=7Hz), 3.14 (2H, t, J=7Hz), 5.59 (IH, s), 6.59 (2H, d, J=9Hz), 6.83 (IH, t, J=7Hz),
7.05-7.18 (5H, m) , 7.22 (IH, d, J=7Hz), 7.98 (IH, d, J=7Hz), 8.26 (2H, d, J=9Hz), 8.44 (IH, d, J=9Hz)
The compounds described in the following Examples 10 to 15 could be obtained by hydrolyzing the corresponding ethyl ester with aqueous sodium hydroxide in accordance with a similar manner to that of Example 9. Example 10
4-[3-[3-[Bis(4-isobutylphenyl)methylamino]benzoyl]- imidazo[1,5-a]pyridin-1-yl]butyric acid
■"•H-NMR (CDC13, δ) : 0.87 (12H, d, J=7Hz), 1.82 (2H, m), 2.13 (2H, m) , 2.42 (4H, d, J=7Hz), 2.48 (2H, t, J=7Hz), 3.03 (2H, t, J=7Hz), 5.56 (IH, s), 6.69 (IH, m), 6.96 (IH, dt, J=l, 7Hz), 7.07 (4H, d, J=8Hz), 7.05-7.3 (2H, m) , 7.27 (4H, d, J=8Hz), 7.53 (IH, m), 7.6-7.7 (2H, m) , 9.75 (IH, d, J=7Hz)
Example 11
4-[3-[4-[Bis(4-isobutylphenyl)methylamino]benzoyl]- imidazo[1,5-a]pyridin-1-yl]butyric acid ■'■H-NMR (CDC13, δ) : 0.89 (12H, d, J=7Hz), 1.84 (2H, m) , 2.13 (2H, m) , 2.45 (4H, d, J=7Hz), 2.48 (2H, t, J=7Hz), 3.05 (2H, t, J=7Hz), 5.59 (IH, s), 6.59 (2H, d, J=9Hz), 6.90 (IH, dt, J=7, 1Hz), 7.07 (IH, m), 7.10 (4H, d, J=8Hz), 7.23 (4H, d, J=8Hz), 7.60 (IH, dt, J=9, 1Hz), 8.28 (2H, d,
J=9Hz), 9.71 (IH, dt, J=7, 1Hz)
Example 12
4-[3-[3-[Bis-(4-isobutylphenyl)methylamino]benzoyl]- azulen-1-γl]butyric acid
■ l-NMR (CDC13, δ) : 0.85 (12H, d, J=7Hz) , 1.82 (2H, m), 2.05 (2H, m) , 2.40 (2H, t, J=7Hz), 2.42 (4H, d, J=7Hz), 3.06 (2H, t, J=7Hz), 5.51 (IH, s), 6.68 (IH, m), 7.08 (4H, d, J=8Hz), 7.0-7.3 (3H, m), 7.25 (4H, d, J=7Hz), 7.42 (IH, t, J=9Hz) ,
7.51 (IH, t, J=9Hz), 7.78 (IH, t, J=9Hz), 7.92 (IH, s), 8.41 (IH, d, J=9Hz), 9.59 (IH, d, J=9Hz) Example 13
4-[3-[4-[Bis(4-isobutylphenyl)methylamino] enzoyl]- azulen-1-yl]butyric acid
1H-NMR (CDC13, δ) : 0.88 (12H, d, J=7Hz), 1.84 (2H, m), 2.07 (2H, m) , 2.51 (2H, t, J=7Hz), 2.45 (4H, d, J=7Hz), 3.09 (2H, t, J=7Hz), 5.58 (IH, s), 6.58 (2H, d, J=8Hz), 7.11 (4H, d, J=8Hz), 7.23 (4H, d, J=8Hz), 7.35 (IH, t, J=9Hz) , 7.42 (IH, t, J=9Hz), 7.72 (2H, d, J=8Hz), 7.65-7.8 (IH, m), 7.97 (IH, s), 8.39 (IH, d, J=9Hz), 9.40 (IH, d, J=9Hz)
Example 14
4-[1-[4-[Bis(4-isobutylphenyl)methoxy]benzoyl]- imidazo[l,5-a]pyridin-l-yl]butyric acid
1H-NMR (CDC13, δ) : 0.88 (12H, d, J=7Hz), 1.83 (2H, m), 2.18 (2H, m) , 2.43 (4H, d, J=7Hz), 2.56 (2H, t, J=7Hz), 3.11 (2H, t, J=7Hz), 6.28 (IH, s), 6.84 (IH, dt, J=l, 7Hz), 7.04 (2H, d, J=9Hz) , 7.10 (4H, d, J=8Hz), 7.13 (IH, m) , 7.30 (4H, d,
J=8Hz), 7.98 (IH, d, J=7Hz), 8.33 (2H, d, J=9Hz), 8.46 (IH, d, J=9Hz)
Example 15 4-[1-[3-[Bis(4-isobutylphenyl)methoxy]benzoyl]- imidazo[1,5-a]pyridin-3-yl]butyric acid
•"■H-NMR (CDC13, δ) : 0.85 (12H, d, J=7Hz) , 1.81 (2H, m), 2.19 (2H, m) , 2.41 (4H, d, J=7Hz), 2.57 (2H, t, J=7Hz), 3.11 (2H, t, J=7Hz), 6.29 (IH, s), 6.86 (IH, dt, J=l, 7Hz) , 7.08 (4H, d, J=8Hz),
7.05-7.4 (3H, m), 7.31 (4H, d, J=8Hz), 7.88-7.95 (2H, m), 7.99 (IH, d, J=7Hz), 8.43 (IH, d, J=9Hz) The compounds of the following Examples 16 to '24 could be obtained by reacting the corresponding amino or hydroxy compounds with bis(4-isobutylphenyl)chloromethane in accordance with a similar manner to that of Example 1.
Example 16
4-[3-[3-[Bis(4-isobutylphenyl)methylamino]benzoyl]-4- quinolon-l-yl]butyric acid
1H-NMR (CDC13, δ) : 0.85 (12H, d, J=8Hz), 1.70-1.90 (2H, m), 2.10-2.30 (2H, m) , 2.42 (4H, d, J=8Hz),
2.40-2.50 (2H, m) , 4.25-4.40 (2H, m) , 5.46 (IH, s), 6.80-7.80 (15H, m) , 8.14 (IH, s), 8.46 (IH, d, J=8Hz)
Example 17
4-[3-[4-Bis(4-isobutylphenyl)methylamino]benzoyl]- 4-quinolon-l-yl]butyric acid
^-N R (CDC13, δ) : 0.90 (12H, d, J=8Hz), 1.74-1.96 (2H, m), 2.14-2.32 (2H, m) , 2.46 (4H, d, J=8Hz), 2.50 (2H, t, J=8Hz), 4.35-4.50 (2H, m) , 5.63
(IH, s), 6.62 (2H, d, J=14Hz), 7.12 (4H, d, -J=12Hz), 7.22 (4H, d, J=12Hz), 7.5-7.6 (IH, m) , 7.70 (2H, d, J=14Hz), 7.80-7.96 (2H, m) , 8.25 (IH, s), 8.46 (IH, d, J=8Hz)
Example 18
4-[3-[3-[Bis(4-isobutylphenyl)methylamino]benzoyl]- 2,3-dihydro-2-oxo-lH-benzimidazol-l-yl]butyric acid
■^- R (CDC13, δ) : 0.88 (12H, d, J=8Hz), 1.68-1.92 (2H, m), 2.0-2.18 (2H, m) , 2.02-2.15 (2H, m) ,
2.43 (4H, d, J=8Hz), 2.46 (2H, t, J=8Hz), 3.86 (2H, t, J=8Hz), 5.44 (IH, s), 6.70 (IH, dd, J=l, 8Hz), 7.00-7.30 (14H, m) , 7.82 (IH, dd, J=l, 8Hz) Example 19
4-[3-[4-[Bis(4-isobutylphenyl)metoxγ]benzoyl]-1H- indazo-1-yl]butyric acid
" t-I-NMR (CDC13, δ) : 0.90 (12H, d, J=8Hz) , 1.75-1.96 (2H, m), 2.26-2.45 (4H, m) , 2.46 (4H, d, J=8Hz),
4.56 (2H, t, J=8Hz), 6.28 (IH, s), 7.06 (2H, d, J=9Hz), 7.12 (4H, d, J=8Hz), 7.20-7.50 (7H, m) , 8.30 (2H, d, J=9Hz), 8.42 (IH, d, J=8Hz)
Example 20
4-[3-[3-[Bis(4-isobutylphenyl)methylamino]benzoyl]- lH-pyrrolo[2,3-b]pyridin-l-yl]butγric acid
^-NMR (CDC13, δ) : 0.87 (8H, d, J=8Hz), 1.72-1.95
(2H, m), 2.14-2.28 (2H, m) , 2.38 (2H, t, J=8Hz), 2.42 (4H, d, J=8Hz), 4.36 (2H, t, J=8Hz), 5.51
(IH, s), 6.74 (IH, dd, J=2, 8Hz), 7.0-7.34 (12H, m), 7.60 (IH, s), 8.40 (IH, dd, J=l, 5Hz), 8.68 (IH, dd, J=l, 8Hz)
Example 21
Ethyl 4-[5-[3-[bis(4-isobutylphenyl)methylamino]- benzoyl]thien-2-yl] utyrate
■""H-NMR (CDC13, δ) : 0.89 (12H, d, J=7Hz), 1.26 (3H, t, J=7Hz), 1.84 (2H, m) , 2.05 (2H, m) , 2.38 (2H, t, J=7Hz), 2.45 (4H, d, J=7Hz), 2.90 (2H, t,
J=7Hz), 4.15 (2H, q, J=7Hz), 5.48 (IH, s), 6.70 (IH, d, J=4Hz), 6.7-7.7 (13H, m)
Example 22 Ethyl 4-[5-[3-[bis(4-isobutylphenyl)methylamino]- benzoyl]-3-phenylthien-2-yl]butyrate
XH-NMR (CDC13, δ) : 0.88 (12H, d, J=7Hz), 1.21 (3H, t, J=7Hz), 1.7-2.1 (4H, m) , 2.32 (2H, t, J=7Hz), 2.43 (2H, d, J=7Hz), 2.94 (2H, t, J=7Hz), 4.08 (2H, q, J=7Hz), 5.50 (IH, m) , 6.68 (IH, m) , 7. 0-7. 5 ( 16H, m) , 7.53 ( IH, s )
Example 23
4-[3-[3-[Bis(4-isobutylphenyl)methylamino]benzoyl]- azulen-1-yl]butyric acid
•'•H-NMR (CDC13, δ) : 0.85 (12H, d, J=7Hz), 1.82 (2H, m), 2.05 (2H, m) , 2.40 (2H, t, J=7Hz), 2.42 (4H, d, J=7Hz), 3.06 (2H, t, J=7Hz) , 5.51 (IH, s), 6.68 (IH, m), 7.08 (4H, d, J=8Hz), 7.0-7.3 (3H, m), 7.25 (4H, d, J=7Hz), 7.42 (IH, t, J=9Hz),
7.51 (IH, t, J=9Hz), 7.78 (IH, t, J=9Hz), 7.92 (IH, s), 8.41 (IH, d, J=9Hz), 9.59 (IH, d, J=9Hz)
Example 24
4-[1-[4-[Bis(4-isobutylphenyl)methoxy]benzoyl]- imidazo[1,5-a]pyridin-1-yl]butyric acid
■ l-NMR (CDCK, δ) : 0.88 (12H, d, J=7Hz), 1.83 (2H, m) , 2.18 (2H, m) , 2.43 (4H, d, J=7Hz), 2.56 (2H, t, J=7Hz), 3.11 (2H, t, J=7Hz), 6.28 (IH, s) ,
6.84 (IH, dt, J=l, 7Hz), 7.04 (2H, d, J=9Hz), 7.10 (4H, d, J=8Hz), 7.13 (IH, m) , 7.30 (4H, d, J=8Hz), 7.98 (IH, d, J=7Hz), 8.33 (2H, d, J=9Hz), 8.46 (IH, d, J=9Hz)
The compounds of the following Examples 25 to 27 could be obtained by hydrolyzing the corresponding ethyl ester compound with an aqueous sodium hydroxide in accordance with a similar manner to that of Example 9.
Example 25
4-[5-[3-[Bis(4-isobutylphenyl)methylamino]benzoyl]- thien-2-yl]butyric acid
"hl-NMR (CDC13, δ) : 0.88 (12H, d, J=7Hz) , 1.83 (2H, m), 2.03 (2H, m) , 2.43 (2H, t, J=7Hz), 2.45 (4H, - -
d, J=7Hz), 2.92 (2H, t, J=7Hz) , 5.50 (IH, s), 6.70 (IH, d, J=4Hz), 6.74 (IH, m) , 6.97 (IH, m) , 7.05-7.3 (11H, m)
Example 26
4-[5-[3-[Bis(4-isobutylphenyl)methylamino]benzoyl]-3- phenylthien-2-yl]butyric acid
■''H-NMR (CDC13, δ) : 0.87 (12H, d, J=7Hz) , 1.7-2.15 (4H, m), 2.38 (2H, t, J=7Hz), 2.42 (2H., d, J=7Hz), 2.97 (2H, t, J=7Hz) , 5.49 (IH, s) , 6.68
(IH, m), 7.0-7.45 (16H, m) , 7.53 (IH, s)
Example 27
4-[1-[3-[Bis(4-isobutylphenyl)methylamino]benzoyl]- imidazo[l,5-a]pyridin-3-yl]butyric acid
1H-NMR (CDC13, δ) : 0.84 (12H, d, J=7Hz), 1.81 (2H, m), 2.18 (2H, m) , 2.52 (4H, d, J=7Hz), 2.54 (2H, t, J=7Hz), 3.10 (2H, t, J=7Hz), 5.52 (IH, s), 6.7-6.9 (2H, m), 7.0-7.85 (10H, m) , 7.6-7.7 (2H, m), 7.98 (IH, d, J=7Hz), 8.40 (IH, d, J=8Hz)
Preparation 48
Methyl 4-[1-(4-hydroxγbenzoyl)imidazo[1,5-a]pyridin-3 yl]butyrate could be obtained in accordance with a similar manner to that of Preparation 19.
1H-NMR (DMSO-dg, δ) : 2.08 (2H, m) , 2.53 (2H, t,
J=7Hz), 3.10 (2H, t, J=7Hz), 3.58 (3H, s), 6.88 (2H, d, J=9Hz), 7.05 (IH, t, J=7Hz), 7.33 (IH, m) 8.3-8.45 (3H, m) , 8.48 (IH, d, J=7Hz)
Preparation 49
To a solution of 4-acetoxybenzoyl chloride (75 mg) and aluminum chloride (51 mg) in dichloromethane (3 ml) was added a solution of ethyl 4-(azulen-1-yl)butyrate (92 mg) i dichloromethane (2 ml) . Af er stirring at room temperature for 1 hour, the mixture was washed with 7% hydrochloric aci and water, dried over magnesium sulfate and evaporated. Th residue was chromatographed on silica gel eluting with a mixture of n-hexane and ethyl acetate (2:1) to give ethyl 4-[3-(4-acetoxγbenzoyl)azulen-l-yl]butyrate (71 mg) as an oil.
1H-NMR (CDC13, δ) : 9.65 (IH, d, J=9Hz), 8.49 (IH, d, J=9Hz), 7.93 (2H, d, J=10Hz), 7.75-7.9 (2H, m) , 7.4-7.6 (2H, m) , 7.25 (2H, d, J=10Hz), 7.2-7.3 (IH, m), 4.13 (2H, q, J=7Hz), 3.09 (2H, t, J=7Hz)
2.37 (2H, t, J=7Hz), 2.36 (3H, s), 2.0-2.2 (2H, m), 1.24 (3H, t, J=7Hz)
Preparation 50 To a solution of ethyl 4-[3-(4-acetoxybenzoyl)- azulen-1-γl]butyrate (40 mg) in ethanol (1 ml) was added sodium hydride 60% dispersion in mineral oil (5mg). After stirring at room temperature fro 10 minutes, the mixture wa poured into 7% hydrochloric acid and extracted with ethyl acetate (10 ml). The organic layer was washed with water, dried over magnesium sulfate and evaporated to give ethyl 4-[3-(4-hydroxybenzoyl)aculen-l-yl]butγrate (39 mg) as an oil. 1H-NMR (CDC13, δ) : 9.55 (IH, d, J=9Hz) , 8.45 (IH, d
J=9Hz), 7.96 (IH, s), 7.80 (2H, d, J=9Hz), 7.7-7 (IH, m), 7.4-7.6 (2H, m) , 6.93 (2H, d, J=9Hz), 6.50 (IH, brs), 4.13 (2H, q, J=7Hz) , 4.13 (2H, q J=7Hz), 3.10 (2H, t, J=7Hz), 2.40 (2H, t, J=7Hz) 2.0-2.2 (2H, m) , 1.23 (3H, t, J=7Hz)
Example 28
To a mixture of methyl 4-[l-(4-hγdroxγbenzoyl)- imidazo[l,5-a]pyridin-3-yl]butγrate (267 mg) , (R)-l-(4-isobutγlphenγl)butanol (179 mg) and triphenylphosphine (228 mg) in a mixture of tetrahydrofura (1 ml) and toluene (4 ml) was added diethyl azodicarboxyla (0.137 ml) at -20°C. After the mixture was stirred at -20 for 3 hours, acetic acid (0.05 ml) was added and the mixtu was warm up to room temperature. The solvent was evaporat under reduced pressure and the residue was chromatographed on silica gel (n-hexane/ethyl acetate, 3:2) to give methyl (S)-4-[1-[4-[1-(4-isobutylphenyl)butoxy]benzoyl]imidazo- [1,5-a]pyridin-3-yl]butyrate (119 mg) as an oil. 1H-NMR (CDC13, δ) : 0.88 (6H, d, J=6.5Hz) , 0.96 (3H, t, J=7.5Hz), 1.3-2.3 (7H, m) , 2.44 (2H, d, J=6.5Hz), 2.53 (2H, t, J=7Hz) , 3.09 (2H, t, J=7.5Hz), 3.69 (3H, s), 5.19 (IH, dd, J=5Hz, 8Hz 6.8-7.0 (3H, m) , 7.05-7.3 (5H, m) , 8.03 (IH, d, J=7Hz), 8.35 (2H, d, J=9Hz), 8.48 (IH, d, J=9Hz) Example 29
Ethyl (S)-4-[3-[4-[l-(4-isobutylphenγl)butoxy]benzoyl] azulen-1-yl]butyrate could be obtained by reacting the corresponding starting compound with (R)-l-(4-isobutylphenyl)butanol in accordance with a simila manner to that of Example 28.
1H-NMR (CDC13, δ) : 9.49 (IH, d, 9Hz), 8.43 (IH, d, 9Hz), 7.92 (IH, s), 7.75 (2H, d, 9Hz) , 7.7-7.8 (IH, m), 7.3-7.6 (2H, m) , 7.26 (2H, d, 9Hz) , 7.11 (2H, d, 9Hz), 6.92 (2H, d, 9Hz), 5.19 (IH, m) ,
4.11 (2H, q, 7Hz), 3.07 (2H, t, 7Hz) , 2.44 (2H, d 7Hz), 2.38 (2H, t, 7Hz) , 2.0-2.1 (3H, m) , 1.7-2.0 (2H, m), 1.3-1.7 (2H, m) , 1.23 (3H, t, 7Hz), 0.98 (3H, t, 7Hz), 0.89 (6H, d, 7Hz) The compounds described in the following Examples 30 and 31 could be obtained by hydrolyzing the corresponding ethyl ester with aqueous sodium hydroxide in accordance wit a similar manner to that of Example 9.
Example 30
(S)-4-[l-[4-[l-(4-Isobutylphenyl)butoxy]benzoyl]- imidazo[1,5-a]pyridyn-3-yl]butyric acid
1H-NMR (CDC13, δ) : 0.88 (6H, d, J=6.5Hz), 0.96 (3H, t, J=7.5Hz), 1.3-2.3 (7H, m) , 2.43 (2H, d, J=6.5Hz), 2.58 (2H, t, J=7Hz), 3.12 (2H, t,
J=7.5Hz), 5.18 (IH, dd, J=5Hz, 8Hz), 6.8-7.0 (3H, m) , 7.09 (2H, d, J=8.5Hz), 7.15-7.3 (3H, m) , 7.98 (IH, d, J=7Hz), 8.30 (2H, d, J=9Hz), 8.47 (IH, d, J=9Hz)
Example 31
(S)-4-[3-[4-[l-(4-Isobutγlphenyl)butoxy]benzoyl]- azulen-1-yl]butyric acid
■"•H-NMR (CDC13, δ) : 9.49 (IH, d, J=9Hz), 8.42 (IH, d, J=9Hz), 7.92 (IH, s), 7.75 (2H, d, J=9Hz), 7.7-7.8 (IH, m) , 7.3-7.6 (2H, m), 7.25 (2H, d, J=9Hz) , 7.10 (2H, d, J=9Hz), 6.93 (2H, d, J=9Hz), 5.19 (IH, m) , 3.10 (2H, t, J=7Hz), 2.4-2.5 (4H, m), 2.0-2.2 (3H, m) , 1.7-2.0 (2H, m) , 1.3-1. (2H, m), 0.97 (3H, t, J=7Hz), 0.89 (6H, d, J=7Hz)

Claims

1. A compound of the formula
R1-A-CO-X-Y-R2 (I)
in which R is carboxy(lower)alkyl or protected carboxy(lower)alkyl,
2 R is optionally substituted aralkyl,
X is optionally substituted arylene, „6
Y is -O- or -N- , wherein R is hydrogen, lower alkyl, optionally substituted aralkyl or amino-protective group, and A is a bivalent radical derived from imidazopyridine, azulene, thiophene, pyrrolo[2,
3-b]pyridine, quinolone, indazole or dihydrobenzimidazole, each of which may be substituted by one or more suitable substituent(s) , or a pharmaceutically acceptable salt thereof.
A compound of claim 1, in which
R -A- can be represented by the formula
R- R~
RJ RJ
R RJ
wherein R is as defined above, and
X is phenylene.
A process for preparing a compound of the formula
R1-A-CO-X-Y-R2 (I)
m which R 1, R2, A, X and Y are each as defined above, or a salt which comprises
(1) reacting a compound of the formula
R -A-CO-X-Y-H (ID
in which R , A, X and Y are each as defined above, or a salt thereof with a compound of the formula :
HO-R" (III) 2 in which R is as defined above, or its reactive derivative at the hydroxy group, or a salt thereof to give the compound (I) , or
(2) removing the carboxy-protective group from a compound of the formula :
R^-A-CO-X-Y-R2 (I-a)
in which R is protected carboxy(lower)alkyl, and
Ra2, A, X and Y are each as defined above, or a salt thereof to give a compound of the formula :
e in which R, is carboxy(lower)alkyl, and
R , A, X and Y are each as defined above, or a salt thereof.
4. A pharmaceutical composition comprising a compound of claim 1 or pharmaceutically acceptable salt thereof in association with a pharmaceutically acceptable, substantially non-toxic carrier or excipient.
5. A method for treating or preventing testosteron 5α-reductase-mediated diseases, which comprises administering a compound of claim 1 or pharmaceutically acceptable salt thereof to human being or animals.
6. Use of a compound of claim 1 or pharmaceutically acceptable salt thereof as a medicament.
7. Use of compound of claim 1 or pharmaceutically acceptable salt thereof as a testosteron 5α-reductase inhibitor .
8. A process for preparing a pharmaceutical composition which comprises admixing a compound of claim 1 or pharmaceutically acceptable salt thereof with a pharmaceutically acceptable, substantially non-toxic carrier or excipient.
EP93900373A 1991-12-31 1992-12-21 ARYL KETONES AS TESTOSTERONE 5$g(a)-REDUCTASE INHIBITORS Withdrawn EP0620818A1 (en)

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