4H-1-benzopyran-4-one derivatives, process for their preparation and their use as medicaments.
Abstract
The novel 4H-1-benzopyran-4-one derivatives are used as antiinflammatories, analgesics, immunosuppressants and antiallergics. The present invention relates in particular to novel compounds of the formula I …<IMAGE>… in which R1 represents hydrogen, alkyl having 1 to 6 carbon atoms, aryl-C1-C4-alkyl, substituted C1-C6-alkyl, C3-C6-cycloalkyl, C3-C6- cycloalkyl-C1-C4-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, aryl, carboxyl or an aldehyde or COO-C1-C4-alkyl group, R2 represents hydrogen, alkyl having 1 to 6 carbon atoms, nitro, amino, aryl, carboxyl, di-C1-C4- alkylamino, or a halogen, R3 represents C1-C4-alkyl, substituted C1-C4- alkyl, hydroxyl, C1-C4-alkoxy, aryl-C1-C4-alkyl, nitro, amino, a C1-C4- alkyl- or di-C1-C4-alkylamino group or halogen, R4 represents hydrogen, hydroxyl, C1-C4-alkoxy, C1-C4-alkanoyloxy, C1-C4-alkoxycarbonyl, aryloxy, amino or a C1-C4-alkyl- or di-C1-C4-alkylamino group, n represents the integer 0, 1 or 2 and R5 represents hydrogen, C1-C6- alkyl, substituted C1-C6-alkyl, aryl-C1-C4-alkyl, C3-C6-cycloalkyl, C3- C6-cycloalkyl-C1-C4-alkyl, C1-C4-alkanoyl or aroyl, where the aryl group is optionally monosubstituted or polysubstituted phenyl, m denotes an integer between 0 and 3 and n denotes an integer between 0 and 2, and their pharmacologically acceptable acid addition salts.

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12 claims: 12 independent, 0 dependent
- 1Compounds of formula I.in which mean:R1 Hydrogen, unsubstituted or substituted C1-C6-Alkyl, aryl-C -C4 -alkyl, C3-C6Cycloalkyl, C3-C6-Cycloalkyl-C1-C4-alkyl, C2-C6Alkenyl, C2-C6-Alkynyl, aryl, carboxyl or an aldehyde or - COO-C1-C4-Alkyl group,R2 Hydrogen, C1-C6 -Alkyl, nitro, amino, aryl, carboxy, di-C1-C4-alkylamino or di-C1-C4alkylamino methyl or a halogen atom,R3 C.1-C4-Alkyl, substituted C1 -C 4-Alkyl, Hydroxy, C1-C4-Alkoxy, aryl-C 1-C4-alkyl, nitro, halogen, amino, C1-C4- or di-C1-C4-alkylamino,R4 Hydrogen, hydroxy, C -C4-Alkoxy, C -C4-Alkanoyloxy, C1-C4-Alkoxycarbonyl, aryloxy, amino, C1-C4-Alkylamino or di- (C 1-C4 alkyl) amino,R5 Hydrogen, C1-C6 -Alkyl, substituted C1 -C6 Alkyl, aryl-C 1-C4 -alkyl, C3-C6 Cycloalkyl, C3-C6-Cycloalkyl-C.1-C4-alkyl, C.1-C4-Alkanoyl or aroyl,n is an integer between 0 and 2,m is an integer between 0 and 3with the exception of the compound (+) - cis-5,7-di-hydroxy-2-methyl-8- [4 '- (3'-hydroxy-l'-methyl) piperidinyl] -4H-l-benzopyran-4 -onand their pharmacologically acceptable acid addition salts and optical isomers. 1. Verbindungen der Formel I worin bedeuten: R1 Wasserstoff, unsubstituiertes oder substituiertes C1-C6-Alkyl, Aryl-C -C4 -alkyl, C3-C6-Cycloalkyl, C3-C6-Cycloalkyl-C1-C4-alkyl, C2-C6-Alkenyl, C2-C6-Alkinyl, Aryl, Carboxyl oder eine Aldehyd-oder - COO-C1-C4-Alkyl-Gruppe,R2 Wasserstoff, C1-C6 -Alkyl, Nitro, Amino, Aryl, Carb- oxyl, Di-C1-C4-alkylamino oder Di-C1-C4-alkylamino- methyl oder ein Halogenatom,R3 C1-C4-Alkyl, substituiertes C1 -C 4-Alkyl, Hydroxy, C1-C4-Alkoxy, Aryl-C 1-C4-alkyl, Nitro, Halogen, Amino, C1-C4- oder di-C1-C4-alkylamino,R4 Wasserstoff, Hydroxy, C -C4-Alkoxy, C -C4-Alkanoy- loxy, C1-C4-Alkoxycarbonyl, Aryloxy, Amino, C1-C4-Alkylamino oder di-(C 1-C4 -alkyl)amino,R5 Wasserstoff, C1-C6 -Alkyl, substituiertes C1 -C6 Alkyl, Aryl-C 1-C4 -alkyl, C3-C6 -Cycloalkyl, C3-C6-Cycloalkyl-C1-C4-alkyl, C1-C4-Alkanoyl oder Aroyl,n eine ganze Zahl zwischen 0 und 2,m eine ganze Zahl zwischen 0 und 3mit Ausnahme der Verbindung (+)-cis-5,7-Di- hydroxy-2-methyl-8-[4'-(3'-hydroxy-l'-methyl)-piperidinyl]-4H-l-benzopyran-4-onsowie deren pharmakologisch unbedenklichen Säureadditionssalze und optischen Isomeren. 1. Verfahren zur Herstellung von Verbindungen der Formel I worin bedeuten: R1 Wasserstoff, unsubstituiertes oder substituiertes C1-C6-Alkyl, Aryl-C1-C4-alkyl, C3-C6-Cycloalkyl, C3-C6-Cycloalkyl-C1-C4-alkyl, C 2-C6-Alkenyl, C3-C6-Alkinyl, Aryl, Carboxyl oder eine Aldehyd- oder - COO-C -C -Alkyl-Gruppe,R2 Wasserstoff, C1-C6-Alkyl, Nitro, Amino, Aryl, Carboxyl, Di-C1-C4-alkylamino oder Di-C1-C4-alkylamino- methyl oder ein Halogenatom,R C -C -Alkyl, substituiertes C1-C4-Alkyl, Hydroxy, C1-C4-Alkoxy, Aryl-C1-C4-alkyl, Nitro, Halogen, Amino, C1-C4 - oder di-C 1-C4-alkylamino.R4 Wasserstoff, Hydroxy, C1-C4-Alkoxy, C1-C4-Alkanoy- loxy, C1-C4-Alkoxycarbonyl, Aryloxy, Amino, C1-C4-Alkylamino oder di-(C1-C4-alkyl)amino,R5 Wasserstoff, C1-C6-Alkyl, substituiertes C1-C6-Alkyl, Aryl-C1-C4-alkyl, C 3-C6-Cycloalkyl, C -C6-Cycloalkyl-C -C4-alkyl, C1-C4-Alkanoyl oder Aroyl,n eine ganze Zahl zwischen 0 und 2,m eine ganze Zahl zwischen 0 und 3sowie deren pharmakologisch unbedenklichen Säureadditionssalze und optischen Isomeren, dadurch gekennzeichnet, daß man eineVerbindung der Formel XII worin R3, R5, n und m die genannte Bedeutung haben, mit einem Alkalimetall und dem Alkylester einer Säure der Formel R1-COOAlkyl, wobei R1 die zur Formel I genannteBedeutung hat, umsetzt zu einem Diketon der Formel XIII und die erhaltene Verbindung durch Umsetzen mit einer Mineralsäure zyklisiert zu einer Verbindung der Formel I, worin R1, R3, R59 m und n die angegebene Bedeutung ha- ben, R4 die Hydroxygruppe und R2 Wasserstoff bedeutet, gegehenenfalls eine Verbindung der Formel I demethoxyliert zu einer Verbindung der Formel I, worin R3 die Hydroxygruppe bedeutet und m die nenannte Bedeutunq hat, und gegebenenfalls eine Verbindung der Formel I, worin R5 CH3 bedeutet, nach Schutz der Hydroxylgruppen mit Bromcyan umgesetzt und die erhaltene Verbindung sauer oder alkalisch umgesetzt wird zu einer Verbindung der Formel I, worin R5 Wasserstoff bedeutet, gegebenenfalls einer Verbindung der Formel I, worinR5 Wasserstoff bedeutet, mit geeigneten elektrophilen Reagenzien wie Halogeniden, Säurechloriden, Tosylaten oder Enonen zu Verbindungen der Formel I umsetzt, worin R5 unsubstituiertes oder substituiertes C1-C6-Alkyl, Aryl-C1-C4-alkyl, C3-C6-Cycloalkyl oder C3-C6-Cycloalkyl-C1-C4-alkyl bedeutet,gegebenenfalls eine Verbindung der Formel I, worin R2 Wasserstoff bedeutet, mit einem sekundären Aminhydrochlorid und Paraformaldehyd umsetzt zu einer Verbindung der Formel I, worin R2 Dialkylaminomethyl bedeu-tet, oder gegebenenfalls eine Verbindung der Formel I, worin R2 Wasserstoff bedeutet, nitriert zu einer Verbindung der Formel I, worin R2-N02 bedeutet, und gegebenenfalls eine Verbindung der Formel I, worin R2-NO2 darstellt, hydriert zu einer Verbindung der Formel I, worin R2 die Aminogruppe darstellt.
- 2Verbindungen gemäß Anspruch 1, worin R , R und R die genannte Bedeutung haben, R3 und R4 die Hydroxylgruppe, m die Zahl 2 und n die Zahl 1 bedeuten. 2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß R1, R2 und R5 die genannte Bedeutung haben, R3 und R4 jeweils die Hydroxylgruppe, m die Zahl 2 und n die Zahl 1 bedeuten. 2nd Compounds according to claim 1, wherein R, R and R have the meaning given, R3 and R4 is the hydroxyl group, m is 2 and n is 1.
- 3Verbindungen gemäß Anspruch 1, worin R1 Wasserstoff oder C1-C3-Alkyl, R2 Wasserstoff oder C1-C3-Alkyl, R3 und R4 jeweils die Hydroxygruppe, R5 C1-C3-Alkyl oder C3-C5-Cycloalkyl, m die Zahl 2 und n die Zahl 1 bedeuten. 3. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß R1 und R3 unabhängig voneinander Wasserstoff oder C1-C3-Alkyl, R3 und R4 jeweils die Hydroxylgruppe, R5 C1-C3-Alkyl oder C3-C5-Cycloalkyl, n die Zahl 2 und m die Zahl 1 bedeuten. 3rd Compounds according to claim 1, wherein R1 Hydrogen or C1-C3-Alkyl, R2 Hydrogen or C1-C3-Alkyl, R3 and R4 each the hydroxyl group, R5 C.1-C3-Alkyl or C3-C5Cycloalkyl, m is the number 2 and n is the number 1.
- 4Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß cis-(±)-2-(2-Chlorphenyl)-5,7-dihydroxy-8-[4'-(3'-hydroxy-1'-methyl)piperidinyl]-4H-1-benzopyran-4-on oder dessen pharmakologisch unbedenklichen Säureadditionssalze dargestellt werden. 4. cis-(±)-2-(2-Chlorphenyl)-5,7-dihydroxy-8-[4'-(3'-hydroxy-l'-methyl)piperidinyl]-4H-l-benzopyran-4-on sowie dessen pharmakologisch unbedenklichen Säureadditionssalze. 4th cis- (±) -2- (2-chlorophenyl) -5,7-dihydroxy-8- [4 '- (3'-hydroxy-l'-methyl) piperidinyl] -4H-l-benzopyran-4-one and its pharmacologically acceptable acid addition salts.
- 5cis - (-) - 2- (2-chlorophenyl) -5,7-dihydroxy-8- [4 '- (3'-hydroxy-1-methyl) piperidinyl] -4H-1-benzopyran-4-one and its pharmacologically acceptable acid addition salts. 5. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß cis-(-)-2-(2-Chlorphenyl)-5,7-dihydroxy-8-[4'-(3'-hydroxy-1-methyl)piperidinyl]-4H-1-benzopyran-4-on oder dessen pharmakologisch unbedenklichen Säureadditionssalze hergestellt werden. 5. cis-(-)-2-(2-Chlorphenyl)-5,7-dihydroxy-8-[4'-(3'-hydroxy-1-methyl)piperidinyl]-4H-1-benzopyran-4-on sowie dessen pharmakologisch unbedenklichen Säureadditionssalze.
- 6cis- (-) - 2-phenyl-5,7-dihydroxy-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one and its pharmacologically acceptable acid addition salts . 6. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß cis-(-)-2-Phenyl-5,7-dihydroxy-8-[4'-(3'-hydroxy-1 '- methyl)piperidinyl]-4H-1-benzopyran-4-on oder dessen pharmakologisch unbedenklichen Säureadditionssalze hergestellt werden. 6. cis- (-)-2-Phenyl-5,7-dihydroxy-8-[4'-(3'-hydroxy-1'-methyl)piperidinyl]-4H-1-benzopyran-4-on sowie dessen pharmakologisch unbedenklichen Säureadditionssalze.
- 7cis- (±) -2-phenyl-5,7-dihydroxy-8- [4 '- (3-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one and its pharmacologically acceptable acid addition salts. 7. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß cis-(±)-2-Phenyl-5,7-dihydroxy-8-(4'-(3'-hydroxy-1'-methyl)piperidinyl]-4H-1-benzopyran-4-n oder dessen pharmakologisch unbedenklichen Säureadditionssalze hergestellt werden. 7. cis-(±)-2-Phenyl-5,7-dihydroxy-8-[4'-(3-hydroxy-1'-methyl)piperidinyl]-4H-1-benzopyran-4-on sowie dessen pharmakologisch unbedenklichen Säureadditionssalzen.
- 8Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß cis-(±)-2-(p-Fluorphenyl)-5,7-dihydroxy-8-[4'-(3,- hydroxy-1'-methyl)piperidinyl]-4H-1-benzopyran-4-on oder dessen pharmakologisch unbedenklichen Säureadditionssalze hergestellt werden. 8. cis-(±)2-(p-Fluorphenyl)-5,7-dihydroxy-8-[4'-(3'-hydroxy-1'-methyl)piperidinyl]-4H-1-benzopyran-4-on sowie dessen pharmakologisch unbedenklichen Säureadditionssalze. 8th. cis- (±) 2- (p-fluorophenyl) -5,7-dihydroxy-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one and its pharmacologically acceptable acid addition salts.
- 9cis- (±) -2- (2-pyridyl) -8- (4 '- (3'-hydroxy-1'-methyl) -piperidinyl] -4H-benzopyran-4-one and its pharmacologically acceptable acid addition salts. 9. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß cis-(±)-2-(2-pyridyl)-8-(4'-(3'-hydroxy-1'-methyl)-piperidinyl]-4H-benzopyran-4-on oder dessen pharmakologisch unbedenkliche Säureadditionssalze hergestellt werden. 9. cis-(±)-2-(2-pyridyl)-8-(4'-(3'-hydroxy-1'-methyl)-piperidinyl]-4H-benzopyran-4-on sowie dessen pharmakologisch unbedenklichen Säureadditionssalze.
- 10Verfahren zur Herstellung von Verbindungen der Formel I worin bedeuten:R Wasserstoff, unsubstituiertes oder substituiertes C1-C6-Alkyl, Aryl-C 1-C4 -alkyl, C3-C6 -Cycloalkyl, C3-C6-Cycloalkyl-C 1-C4 -alkyl, C 2-C6-Alkenyl, C3-C6-Alkinyl, Aryl, Carboxyl oder eine Aldehyd-oder - COO-C 1-C4-Alkyl-Gruppe,R2 Wasserstoff, C1-C6 -Alkyl, Nitro, Amino, Aryl, Carboxyl, Di-C -C4-alkylamino oder Di-C1-C4-alkylamino- methyl oder ein Halogenatom,R3C1-C4-Alkyl, substituiertes C 1-C4-Alkyl, Hydroxy, C1-C4-Alkoxy, Aryl-C 1-C4 -alkyl, Nitro, Halogen, Amino, C1-C4- oder di-C -C4-alkylamino.R4 Wasserstoff, Hydroxy, C1-C4-Alkoxy, C1-C4-Alkanoy- loxy, C1-C4-Alkoxycarbonyl, Aryloxy, Amino, C1-C4-Alkylamino oder di-(C1-C4-alkyl)amino,R5 Wasserstoff, C1-C6-Alkyl, substituiertes C1-C6-Alkyl, Aryl-C1-C4-alkyl, C3-C6-Cycloalkyl, C3-C6-Cycloalkyl-C1-C4-alkyl, C1-C4-Alkanoyl oder Aroyl,n eine ganze Zahl zwischen 0 und 2,m eine ganze Zahl zwischen 0 und 3sowie deren pharmakologisch unbedenklichen Säureadditionssalze und optischen Isomeren,dadurch gekennzeichnet, daß man eine Verbindung der Formel XII worin R3, R5, n und m die genannte Bedeutung haben, mit einem Alkalimetall oder Alkalimetallhydrid und dem Alkylester einer Säure der Formel R1-COOAlkyl, wobei R1 die zur Formel I genannte Bedeutung hat, umsetzt zu einem Diketon der Formel XIII und die erhaltene Verbindung durch Umsetzen mit einer Mineralsäure zyklisiert zu einer Verbindung der Formel I,worin R , R3, R5, m und n die angegebene Bedeutung haben, R 4 die Hydroxygruppe und R 2 Wasserstoff bedeutet, gegebenenfalls eine Verbindung der Formel I demethoxyliert zu einer Verbindung der Formel I, worin R3 Hydroxy bedeutet und m die genannte Bedeutung hat, und gegebe- nenfalls eine Verbindung der Formel I, worin R 5 CH 3 bedeutet, nach Schutz der Hydroxylgruppen mit Bromcyan umsetzt und die erhaltene Verbindung sauer oder alkalisch umsetzt zu einer Verbindung der Formel I, worin R5 Wasserstoff bedeutet,gegebenenfalls einer Verbindung der Formel I, worin R5 Wasserstoff bedeutet, mit geeigneten elektrophilen Reagenzien wie Halogeniden, Säurechloriden, Tosylaten oder Enonen zu Verbindungen der Formel I umsetzt, worin R unsubstituiertes oder substituiertes C1-C6-Alkyl, Aryl-C1-C4-alkyl, C3-C6-Cycloalkyl oder C 3-C6-Cycloalkyl-C1-C4-alkyl bedeutet,gegebenenfalls eine Verbindung der Formel I, worin R 2 Wasserstoff bedeutet, mit einem sekundären Aminhydrochlorid und Paraformaldehyd umsetzt zu einer Verbindung der Formel I, worin R 2 Dialkylaminomethyl bedeutet, oder gegebenenfalls eine Verbindung der Formel I, worin R2 Wasserstoff bedeutet, nitriert zu einer Ver- bindung der Formel I, worin R 2 NO 2 bedeutet, und gegebenenfalls eine Verbindung der Formel I, worin R 2 NO 2 darstellt, hydriert zu einer Verbindung der Formel I, worin R 2 die Aminogruppe darstellt. 10. Verwendung einer Verbindung der Formel I gemäß Anspruch 1 zur Herstellung eines Arzneimittels mit entzündungshemmendender und/oder immunmodulatorischer Wirkung. 10th Process for the preparation of compounds of formula I.in which mean:R is hydrogen, unsubstituted or substituted C1-C6-Alkyl, aryl-C 1-C4 -alkyl, C3-C6 Cycloalkyl, C3-C6-Cycloalkyl-C 1-C4 -alkyl, C 2-C6Alkenyl, C3-C6-Alkynyl, aryl, carboxyl or an aldehyde or - COO-C 1-C4-Alkyl group,R2 Hydrogen, C1-C6 -Alkyl, nitro, amino, aryl, carboxyl, di-C -C4-alkylamino or di-C1-C4alkylamino methyl or a halogen atom,R3C.1-C.4-Alkyl, substituted C 1-C4-Alkyl, hydroxy, C1-C4-Alkoxy, aryl-C 1-C4 -alkyl, nitro, halogen, amino, C1-C4- or di-C -C4alkylamino.R4 Hydrogen, hydroxy, C1-C4-Alkoxy, C1-C4-Alkanoyloxy, C1-C4-Alkoxycarbonyl, aryloxy, amino, C1-C4-Alkylamino or di- (C1-C4alkyl) amino,R5 Hydrogen, C1-C6-Alkyl, substituted C1-C6-Alkyl, aryl-C1-C4-alkyl, C3-C6Cycloalkyl, C.3-C6-Cycloalkyl-C1-C4-alkyl, C1-C4-Alkanoyl or aroyl,n is an integer between 0 and 2,m is an integer between 0 and 3as well as their pharmacologically acceptable acid addition salts and optical isomers,characterized in that a compound of formula XIIwhere R3, R5, n and m have the meaning given, with an alkali metal or alkali metal hydride and the alkyl ester of an acid of the formula R.1-COOalkyl, where R1 has the meaning given for formula I, converts to a diketone of formula XIII and the compound obtained cyclizes to a compound of the formula I by reaction with a mineral acid,where R, R3, R5, m and n have the meaning given, R 4 the hydroxy group and R 2 Means hydrogen, optionally a compound of the formula I demethoxylated to a compound of the formula I, in which R3 Hydroxy means and m has the meaning given, and given otherwise a compound of the formula I, where R 5 CH 3 means, after protection of the hydroxyl groups with cyanogen bromide and the resulting compound is converted acidic or alkaline to a compound of formula I, wherein R5 Hydrogen meansoptionally a compound of formula I, wherein R5 Hydrogen means, with suitable electrophilic reagents such as halides, acid chlorides, tosylates or enones, to give compounds of the formula I in which R is unsubstituted or substituted C1-C6-Alkyl, aryl-C1-C4-alkyl, C3-C6Cycloalkyl or C 3-C6-Cycloalkyl-C1-C4-alkyl meansoptionally a compound of formula I, wherein R 2 Hydrogen means, with a secondary amine hydrochloride and paraformaldehyde reacted to a compound of formula I, wherein R 2 Dialkylaminomethyl means, or optionally a compound of the formula I, in which R 2 is hydrogen, nitrates to a compound of the formula I, in which R 2 NO 2 means, and optionally a compound of formula I, wherein R 2 NO 2 represents hydrogenated to a compound of formula I, wherein R 2 represents the amino group.
- 11Medicament, characterized by a content of a compound of formula I according to claim 1 or a pharmacologically acceptable acid addition salt. 11. Arzneimittel, gekennzeichnet durch einen Gehalt an einer Verbindung der Formel I gemäß Anspruch 1 oder einem pharmakologisch unbedenklichen Säureadditionssalz.
- 12Verwendung einer Verbindung gemäß Anspruch 1 zur Herstellung eines Arzneimittels mit entzündungshemmender und/oder immunmodulierender Wirkung. 12th Use of a compound according to claim 1 for the manufacture of a medicament with an anti-inflammatory and / or immunomodulating effect.
Independent claims12
111 paragraphs, as filed
The present invention relates to new 4H-1-benzopyran-4-one derivatives, processes for their preparation and their use as antiphlogistics, analgesics, immunosuppressants and antiallergics. In particular, the present invention relates to new compounds of the formula I<chemistry id="chem0001" num="0001"><img file="EP0241003A2_D0001.tif" /></chemistry>where R<sub>1</sub> for hydrogen, alkyl with 1 to 6 carbon atoms, aryl-C<sub>1</sub>-C<sub>4</sub>-alkyl, substituted C<sub>1</sub>-C<sub>6</sub>-Alkyl, <sup>C.</sup><sub>3</sub>-C<sub>6</sub>Cycloalkyl, C<sub>3</sub>-C<sub>6</sub>-Cycloalklyl-C<sub>1</sub>-C<sub>4</sub>-alkyl, C<sub>2</sub>-C<sub>6</sub>Alkenyl, C<sub>2</sub>-C<sub>6</sub>-Alkynyl, aryl, carboxyl or an aldehyde or COO-C<sub>1</sub>-C<sub>4</sub>-Alkyl group, R<sub>2</sub> for hydrogen, alkyl with 1 to 6 carbon atoms, nitro, amino, aryl, carboxyl, di-C<sub>1</sub>-C<sub>4</sub>-alkylamino, or a halogen, R<sub>3</sub> for C<sub>1</sub>-C<sub>4</sub>-Alkyl, substituted C<sub>1</sub>-C<sub>4</sub>-Alkyl, hydroxyl, C<sub>1</sub>-C<sub>4</sub>-Alkoxy, aryl-C<sub>1</sub>-C<sub>4</sub>-alkyl, nitro, amino, a C<sub>1</sub>-C<sub>4</sub>-Alkyl- or di-C<sub>1</sub>-C<sub>4</sub>-alkylamino group or halogen, R for hydrogen, hydroxyl, C<sub>1</sub>-C<sub>4</sub>-Alkoxy, C<sub>1</sub>-C<sub>4</sub>-Alkanoyloxy, C<sub>1</sub>-C<sub>4</sub>-Alkoxycarbonyl, aryloxy, amino or a C<sub>1</sub>-C<sub>4</sub>-Alkyl- or Di-C<sub>1</sub>-C<sub>4</sub>-Alkylamino group, n for the integer 0, 1 or 2 and R.<sub>5</sub> for hydrogen, C<sub>1</sub>-C<sub>6</sub>-Alkyl, substituted C<sub>1</sub>-C<sub>6</sub>-Alkyl, aryl-C<sub>1</sub>-C<sub>4</sub>-alkyl, C<sub>3</sub>-C<sub>6</sub>Cycloalkyl, C<sub>3</sub>-C<sub>6</sub>-Cycloalkyl-C<sub>1</sub>-C<sub>4</sub>-alkyl, C<sub>1</sub>-C<sub>4</sub>-Alkanoyl or aroyl, where the aryl group is optionally mono- or polysubstituted phenyl, m is an integer between 0 and 3 and n is an integer between 0 and 2, and their pharmacologically acceptable acid addition salts.
The compounds according to the invention have two asymmetric centers, one at the point of connection of the nitrogen heterocycle with the benzopyr portion (C-4 ') and the other at R<sub>4</sub> substituted carbon atom (C-3 '), so that two optical isomer pairs are possible. It goes without saying that all possible stereoisomers and their mixtures are included in the definition of the compounds according to the invention. In particular, both the racemic forms and the isolated optical isomers possessing the stated activity are included. The two racemates can be separated using physical methods such as fractional crystallization. The individual optical isomers can be obtained from the racemates by standard methods such as salt formation with an optically active acid and subsequent crystallization.
EP-A2-0 137 193 already contains the compound (+) - cis-5,7-dihydroxy-2-methyl-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H -1-benzopyrano-4-one, their isolation from the plant Dysoxylum binectariferum and their use as agents for immunomodulation are described. This connection is therefore excluded from the present invention.
As alkyl groups for R<sub>1</sub>-R<sub>5</sub> For example, straight-chain or branched radicals having up to 6 and preferably up to 5 carbon atoms are suitable, for example methyl, ethyl, propyl, isopropyl, t-butyl, pentyl or isopentyl groups.
As substituted alkyl groups for R<sub>1</sub>-R<sub>5</sub> are, for example, haloalkyl such as trifluoromethyl, hydroxyalkyl such as hydroxyethyl or carboxyalkyl such as carboxyethyl.
Suitable examples of a cycloalkyl group R and R having 3 to 6 carbon atoms are cyclopropyl, cyclobutyl, cyclopentyl or cyclohexyl. Cycloalkylalkyl is, for example, cyclopropylmethyl.
An aralkyl group R and R<sub>5</sub> is, for example, a phenylalkyl group in which the phenyl group is optionally substituted by substituents such as halogen, C -C<sub>4</sub>-Alkyl, C<sub>1</sub>-C<sub>4</sub>Alkoxy, nitro or a trifluoromethyl group is mono- or polysubstituted.
An aryl group R<sub>1</sub> and R<sub>5</sub> is for example a phenyl group which may be substituted by substituents such as halogen, C<sub>1</sub>-C<sub>4</sub>-Alkyl, C<sub>1</sub>-C<sub>4</sub>Alkoxy, nitro, hydroxy, carbonyl, amino, pyridyl or trifluoromethyl is mono- or polysubstituted.
As a suitable example of alkylamino R<sub>1</sub> and R comes (CH<sub>2</sub>)<sub>n</sub>-NO<sub>6</sub>R<sub>7</sub> in question, where n for 1-3 and R <sub>6 </sub>and R <sub>7</sub> for alkyl with the same meaning as for alkyl R above<sub>1</sub>-R<sub>5</sub> stand; furthermore, R and R together with the nitrogen atom to which they are attached can represent a heterocycle with one or more heteroatoms. Suitable examples of heterocycles formed by R and R together with the nitrogen to which they are attached are piperidine, pyrrolidine, morpholine, piperazine or imidazole, which are optionally substituted at one or more positions by C -C<sub>4</sub>-Alkyl, C<sub>1</sub>-C<sub>4</sub>-Alkoxy, aryl or a hydroxyl or amino group can be substituted.
Suitable examples of salts of the compounds according to the invention with inorganic or organic acids are the hydrochloride, hydrobromide, sulfate, phosphate, acetate, oxalate, tartrate, citrate, maleinate or fumarate.
Preferred compounds correspond to the formula Ia,<chemistry id="chem0002" num="0002"><img file="EP0241003A2_D0002.tif" /></chemistry>where R<sub>1</sub>, R and R have the same meanings as described above and in particular mean:<ul id="ul0001" list-style="none"><li>R<sub>1</sub> Hydrogen, C<sub>1</sub>-C<sub>3</sub>-Alkyl or aryl</li><li>R<sub>2</sub> Hydrogen, C<sub>1</sub>-C<sub>3</sub>-Alkyl or aryl</li><li>RC<sub>1</sub>-C<sub>3</sub>-Alkyl, C<sub>3</sub>-C<sub>5</sub>Cycloalkyl or C<sub>3</sub>-C<sub>5</sub>-Cycloalkyl-35 C<sub>1</sub>-C<sub>3</sub>-alkyl.</li></ul>
Particularly preferred compounds according to the invention are:<ul id="ul0002" list-style="none"><li>cis - (-) - 5,7-dihydroxy-2-methyl-8- (4 '- (1'-cyclopropylmethyl-3'-hydroxy) piperidinyl] -4H-1-benzopyran-4-one,</li><li>cis - (+) - 5.7-<sub>D</sub>i<sub>H</sub>y<sub>d</sub>roxy-2-methyl-8- [4 '- (3'-hydroxy-l'-methyl) piperidinyl] -4H-1-benzopyran-4-one,</li><li>cis - (-) - 5,7-dihydroxy-2-methyl-8- [4 '- (3'-hydroxy-l'-methyl) -piperidinyl] -4H-l-benzopyran-4-one,</li><li>cis- (±) -5,7-dihydroxy-2-methyl-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one,</li><li>cis - (+) - 5,7-dihydroxy-2-ethyl-8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one and</li><li>cis - (+) - 5,7-Dihydroxy-2-n-propyl-S- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis - (+) - 5,7-Dihydroxy-2-n-propyl-8- [4 '- (31-hydroxy-1'-methyl) piperidinyl-4H-1-benzopyran-4-one.</li><li>cis - (-) - 5,7-Dihydroxy-2-n-propyl-8 - ['4' - (3'-hydroxy-1'-methyl) piperidinyl -] - 4H-1-benzopyran-4-one.</li><li>cis- (±) -2-n-butyl-5,7-dihydroxy-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis- (±) -5,7-dihydroxy-2-phenyl-8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis - (-) - 5,7-Dihydroxy-2-phenyl-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis- (±) -2- (2-chlorophenyl) -5,7-dihydroxy-8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-benzopyran-4-one.</li><li>cis - (-) - 2- (2-chlorophenyl) -5,7-dihydroxy-8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis- (±) -2- (4-aminophenyl) -5,7-dihydroxy-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis- (±) -2- (4-bromophenyl) -5,7-dihydroxy-8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis- (±) -2- (4-chlorophenyl) -5,7-dihydroxy-8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis- (±) -2- (2,4-diehlorophenyl) -5,7-dihydroxy-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4- on.</li><li>cis- (±) -5,7-dihydroxy-2- (4-fluorophenyl) -8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis- (±) -5,7-dihydroxy-2- (2-fluorophenyl) -8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis- (±) -5,7-dihydroxy-2- (4-methylphenyl) -8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis- (±) -5,7-dihydroxy-2- (2-pyridyl) -8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li><li>cis- (±) -5,7-dihydroxy-2- (4-pyridyl) -8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one.</li></ul>
New 4H-1-benzopyran-4-one derivatives according to the invention are listed in Tables 1 to 5 below, reference being made to the following formulas:<chemistry id="chem0003" num="0003"><img file="EP0241003A2_D0003.tif" /></chemistry><chemistry id="chem0004" num="0004"><img file="EP0241003A2_D0004.tif" /></chemistry><chemistry id="chem0005" num="0005"><img file="EP0241003A2_D0005.tif" /></chemistry><chemistry id="chem0006" num="0006"><img file="EP0241003A2_D0006.tif" /></chemistry><chemistry id="chem0007" num="0007"><img file="EP0241003A2_D0007.tif" /></chemistry><tables id="tabl0001" num="0001"><img file="EP0241003A2_D0008.tif" /></tables><tables id="tabl0002" num="0002"><img file="EP0241003A2_D0009.tif" /></tables><chemistry id="chem0008" num="0008"><img file="EP0241003A2_D0010.tif" /></chemistry><tables id="tabl0003" num="0003"><img file="EP0241003A2_D0011.tif" /></tables><chemistry id="chem0009" num="0009"><img file="EP0241003A2_D0012.tif" /></chemistry><tables id="tabl0004" num="0004"><img file="EP0241003A2_D0013.tif" /></tables><tables id="tabl0005" num="0005"><img file="EP0241003A2_D0014.tif" /></tables><tables id="tabl0006" num="0006"><img file="EP0241003A2_D0015.tif" /></tables><tables id="tabl0007" num="0007"><img file="EP0241003A2_D0016.tif" /></tables>
The present invention also relates to a process for the preparation of compounds of the general formula I, which comprises the stages outlined in the diagram in the attached FIG. 1. If desired, further chromone derivatives according to the invention can be obtained by treating compounds of the formula I 'in FIG. 1 by known methods. The general scheme depicted in FIG. 1 is explained and described in more detail by the reaction sequence depicted in FIG. 2, which relates to the preparation of one of the preferred compounds according to the invention; it goes without saying that the scope of the invention is not restricted thereby.
The preparation of the compound of formula VIII with n = 1 is known to the person skilled in the art [SM McClavain and RS Berger, J. Am. Chem. Soc., 77, 2848 (1955); A. Ziering, L. Berger, SD Heineman and J. Lec., J. Org. Chem., 12, 894 (1947)]. Two methods are described there. In the first, 1,3,5, -trimethoxybenzene is stirred with n-butyllithium at low temperatures, preferably between -60 and -90 ° C, in inert solvents such as hydrocarbons, for example Pentane or hexane, or ether solvents, such as diethyl ether or tetrahydrofuran, for the preparation of the lithio salt which, when stirred with 1-methyl-4-piperidone and subsequent acidification, gives the tetrahydropyridine derivative. In the second and particularly preferred method, 1,3,5-trimethoxybenzene is stirred under acidic conditions with 1-methyl-4-piperidone in solvents such as water, acetic acid, alcoholic solvents or a suitable mixture thereof, glacial acetic acid being particularly preferred.
With reference to the scheme in Figure 2, the tetrahydropyridine derivative of the depicted formula VIIIA (ie formula VIII with n = 1) is used by itself by adding BF <sub>3 </sub>Etherate to a slurry of sodium borohydride in diethylene glycol dimethyl ether under anhydrous conditions and in a diborane directly forming in an inert atmosphere maintained by continuous passage of nitrogen or argon. The reaction temperature is kept between 20 and 90'C, but a temperature range of 50-60 ° C is preferred. The resulting organoborane complex is first treated with hydrochloric acid and then oxidized by adding alkali and hydrogen peroxide. The compound thus obtained is a trans alcohol of the formula IXA and is converted into the cis alcohol of the formula XIA by oxidation and subsequent reduction . The trans alcohol of the formula IXA is oxidized by means of a reagent combination, namely acid chlorides, with oxalkyl chloride being preferred, dimethyl sulfoxide and triethylamine and is known to the person skilled in the art as oxidation according to Swern. The ketone of the formula XA formed by oxidation of the compound of the formula IXA is reduced by means of hydride reagents, preferably diborane, lithium borohydride or sodium borohydride. A wide range of solvents are compatible with sodium borohydride, but proton-containing solvents such as methanol, ethanol and isopropanol are preferred. By maintaining a higher reaction temperature, the cis isomer can be obtained stereoselectively.
The cis isomer can also be obtained by fractional crystallization of its acid addition salts, which are formed with optically active acids such as. B. (-) - and / or (+) - dibenzoyl tartaric acid.
The cis isomer can optionally also be esterified with an optically active acid such as (-) - menthyloxyacetic acid and the resulting diastereomeric esters can then be separated by conventional methods such as fractional crystallization or chromatography.
The cis-hydroxy compound of formula XIA is acetylated with acetic anhydride and acidic catalysts such as aluminum chloride, boron trifluoride etherate and tin (IV) chloride, boron trifluoride etherate being particularly preferred as the reagent. If a large excess of boron trifluoride etherate is used, demethylation also takes place at the same time, and only the desired methoxyl group is demethylated in a regiospecific manner, giving a compound of the formula XIIA, in which R represents the radical -COCH-3. The hydrolysis of this compound with an alkali metal hydroxide leads to compounds of the formula XIIA with R = H. The compound of formula XIIA is then converted to the chromon by methods known per se, two of which are described here. In the first method, the compound of formula XIIA with R = H is stirred at room temperature and in inert solvents such as ether, tetrahydrofuran, dioxane or hydrocarbon solvents such as hexane with ethyl acetate and alkali metal or NaH, preferably sodium metal; if the ester is a low-boiling liquid as in the present example, it can also be used as a solvent. The reaction is normally complete after one to ten hours and gives the diketone of the formula XIIIA with R = H, which is cycled to give the chromone of the formula IA when stirred with mineral acids such as hydrochloric acid or sulfuric acid. In the second method, a compound of formula XII A with R = Ac is esterified with a suitable acid, e.g. B. benzoic acid, and the ester obtained with a base such as. B. alkali hydroxide, in an inert solvent such as. B. THF, dioxane or pyridine stirred, the chromone of the formula XIII A with R = Ac and R<sub>1</sub> = Phenyl is formed. Compounds of formula Ia with R<sup>= </sup>H and R1 <sup>=</sup> CH are demethoxylated with pyridine hydrochloride to obtain the hydroxy compound of formula IB shown. Different 2-substituted chromones can be produced using the corresponding esters instead of ethyl acetate.
The dimethoxychromone of formula IA can be used with AlCl<sub>3</sub>, BBr<sub>3</sub> or HBr / acetic acid can also be demethoxylated using other acidic reagents. The demethoxylation is carried out by heating the dimethoxychromone derivatives with pyridine hydrochloride for a period of 2 to 10 hours to 180<sup>*</sup>C. In some cases, the addition of high boiling amines to the pyridine hydrochloride can be beneficial.
The synthesis scheme of Figure 2 can be used to prepare compounds of formula I with R<sub>5</sub> = H, alkyl (other than methyl), cycloalkyl, aralkyl and aryl. Compounds of formula I, wherein R<sub>5</sub> has the same meaning as above, can also be derived from the corresponding N-methyl compounds, ie R<sub>5</sub> = CH<sub>3</sub> (Compounds of formula IB) by one of the known methods. A typical procedure can be seen from the diagram in FIG. 3, where a compound of the formula IB with R<sub>5 </sub>= CH<sub>3</sub> treated with cyanogen bromide after protection of the hydroxyl groups and then acidic or alkaline to give compounds with R<sub>5</sub> = H (compound of formula XIV) is hydrolyzed. When treated with suitable electrophilic reagents such as halides, acid chlorides, tosylates or enones, this compound gives compounds with R.<sub>5</sub> = Alkyl, cycloalkyl, aralkyl or aryl, the compound of the formula XVII shown being a specific example. According to FIG. 3, 5,7-dihydroxy-2-methyl-8- [4 '- (1'-cyclopropylmethyl-3'-hydroxy) -piperidinyl] -4H-1-benzopyran-4-one of the depicted formula XVII is obtained by peracetylation of 5,7-dihydroxy-2-methyl-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one of formula IB with acetic anhydride and sodium acetate at 80 -90'C manufactured. The peracetylated product of formula XIV is stirred with cyanogen bromide in chloroform and gives 5,7-diacetyl-2-methyl-8- [4 '- (3'-acetoxy-1'-cyan) -piperidinyl] -4H in the presence of potassium carbonate -1-benzopyran-4-one of the formula XV, which is heated to 110 with 2N hydrochloric acid for 5 hours<sub>.</sub>C provides the hydrolyzed and N-demethylated product 5,7-dihydroxy-2-methyl-8- [4 '- (3'-hydroxy) piperidinyl] -4H-1-benzopyran-4- one of the formula XVI. When heating with cyclopropylmethyl chloride in isobutyl alcohol, this is obtained<sub>N</sub>Cyclopropylmethyl derivative of the formula XVII shown. Compounds of formula I, wherein R<sub>2</sub> Dialkylaminomethyl means are prepared by the corresponding chromon with R<sub>2</sub> = H heated to reflux with a secondary amine hydrochloride and paraformaldehyde in dioxane or alcoholic solvents. Compounds of formula I with R2 = N0<sub>2 </sub>are expedient by stirring the corresponding chromon with R<sub>2 </sub>= H made with acetic acid and concentrated nitric acid. Compounds of formula I with R<sub>2</sub> = NH<sub>2</sub> is obtained from the corresponding nitroderivatives by hydrogenation over 10% Pd / C.
Compounds of formula I, wherein one of the R<sub>3</sub>Groups stands for bromine, is prepared by stirring the corresponding chromones with R 3 = H with N-bromosuccinimide in dimethylformamide.
Another feature of the invention is that the compounds according to the invention represented by the formula I have pharmacological properties. In particular, they show an anti-inflammatory and immunomodulating effect on laboratory animals. These properties are confirmed by the results of the subsequent pharmacological tests which were carried out to assess the compounds according to the invention and their salts.
Systemic anti-inflammatory effects on carrageenin-induced paw edema in the rat
Male Charles Foster rats (120-150 g) were fasted with water ad libitum for 18 hours. The test compound dissolved in distilled water was administered orally. The control group received distilled water. 0.05 ml of 0.5% carrageenin suspension was injected subcutaneously into the sole area of the left hind paw. The paw volume was determined using a Maclab differential volume meter from the carrageenan injection and 3 and 6 hours thereafter. The percent paw volume decrease was calculated using the following equation:<maths id="math0001" num=""><img file="EP0241003A2_D0017.tif" /></maths>
The ED<sub>50</sub>-value was calculated from the dose / effect curve. Six animals were used per group.
The results with representative compounds according to the invention and their salts are shown in Table 4, the substituents relating to the following formula Ia:<chemistry id="chem0010" num="0010"><img file="EP0241003A2_D0018.tif" /></chemistry><tables id="tabl0008" num="0008"><img file="EP0241003A2_D0019.tif" /></tables><tables id="tabl0009" num="0009"><img file="EP0241003A2_D0020.tif" /></tables>
Reverse passive arthus response (RPA) in the rat
Charles Foster rats of both sexes, weighing 150-180 g, were sorted into groups of six animals each. 24 hours before the RPA was triggered, the rats were sheared from the mid-back region and fasted overnight. The test compounds were administered orally one hour before induction of the Arthus response. The RPA response was induced by intradermal injection of 0.1 ml of appropriately diluted rabbit anti-BSA serum. Immediately after the intradermal injections, the rats received 0.5 ml of 0.4% bovine serum albumin intravenously. Four hours after the intradermal exposure, the animal groups were each killed by a broken neck. The entire thickness of the skin was removed from the back of each animal and a 12 mm diameter disc was punched out with a metal punch at the site of the antiserum injection. The wet weight of the skin area was determined as soon as possible. The edema caused by the RPA was measured as the difference (expressed in mg) between the wet weight of the antibody injected site and the normal rabbit serum injected site.
The results are expressed as a percentage inhibition or potentiation of the edema by the compound compared to the edema induced in the untreated control animals.
The results with representative compounds according to the invention and their salts are shown in Table 7.<tables id="tabl0010" num="0010"><img file="EP0241003A2_D0021.tif" /></tables><tables id="tabl0011" num="0011"><img file="EP0241003A2_D0022.tif" /></tables><tables id="tabl0012" num="0012"><img file="EP0241003A2_D0023.tif" /></tables> The invention is illustrated by the following examples, but is not restricted.
example 1
1-methyl-4- (2,4,6-trimethoxyphenyl) -1,2,3,6-tetrahydropyridine
N-Methylpiperidone (2.8 mol) is added with stirring to a solution of trimethoxybenzene (2.38 mol) in glacial acetic acid (750 ml), the temperature of the reaction mixture being kept below 25 ° C. When the addition is complete, hydrogen chloride is bubbled through the reaction mixture, heated to 95-100 ° C. for 3 hours, then concentrated and the residue is diluted with water. The aqueous solution is extracted with ether, the ether is separated off and the aqueous layer is made alkaline with concentrated sodium hydroxide solution. The precipitate thus obtained is filtered off, washed with water and dried. Recrystallization from petroleum ether (60 ° -80 ° C) gives 550 g of 1-methyl-3- (2,4,6-trimethoxyphenyl) -1,2,3,6-tetrahydropyridine with a melting point of 118-122 ° C.
Analysis: Calculated for C<sub>15</sub>H<sub>21</sub>NO<sub>3</sub>.0.5H<sub>2</sub>OC, 66.17; H, 8.08; N, 5.14% Found: C, 67.75; H, 7.56; N, 5.03%
Example 2
(±) trans-3-hydroxy-4- (2,4,6-trimethoxyphenyl) -1-methylpiperidine
A solution of BF etherate (42 ml) in diethylene glycol dimethyl ether (42 ml) is added dropwise to a cooled mixture of 1-methyl-4- (2,4,6-trimethoxyphenyl) -1,2,3,6-tetra-hydropyridine (20 g) and sodium borohydride (12 g) in diethylene glycol dimethyl ether (140 ml). The mixture is heated at 50 ° C. for one hour and the cooled reaction mixture is then treated with water (20 ml) and then with concentrated HCl (116 ml). The mixture is stirred at 50-60 ° C for two hours, cooled and made alkaline with sodium hydroxide solution. Hydrogen peroxide solution (30%, 20 ml) is then added and the mixture is heated to 50-60 ° C. for two hours with stirring. The solution is cooled and extracted with ethyl acetate. The ethyl acetate extract is concentrated in vacuo. The residue is acidified with 2N HCl, extracted with ethyl acetate and the organic layer is separated off. The aqueous layer is then made alkaline with sodium hydroxide solution and extracted with ether. The ether extract is washed with brine, dried over sodium sulfate and concentrated to give a solid residue which is recrystallized from hot water, which was trans-3-hydroxy-4- (2,4,6-trimethoxyphenyl) -1-methylpiperidine (12 g) results. Yield: 12g; Melting point 88 ° -89 ° C.
Analysis: compound as oxalate, calculated for C<sub>15</sub>H<sub>23</sub>NO<sub>4</sub>.0.5 (COOH)<sub>2</sub>.1.75H<sub>2</sub>OC, 56.5; H, 7.5; N, 4.12% Found: C, 56.37; H, 8.14; N, 4.84%
Example 3
(±) 1-Methyl-4- (2,4,6-trimethoxyphengl) piperidin-3-one
Dimethyl sulfoxide (35 ml) is added dropwise to a solution of oxyalkyl chloride (20 ml) in dry methylene chloride (500 ml), cooled to -60 ° C., and the mixture is stirred for 5-10 minutes. A solution of (±) -trans-3-hydroxy-4- (2,4,6-trimethoxyphenyl) -1-methylpiperidine (62 g) in methylene chloride (300 ml) is then added while the temperature of the reaction mixture is at -60 ° C holds. After the addition, stir for 15 minutes and add triethylamine (155 ml). Then the reaction mixture is allowed to warm to a temperature of -30 ° C., diluted with water and made alkaline with sodium carbonate. The organic layer is separated and the aqueous layer extracted with ethyl acetate. The organic layers are combined, washed with brine, over anhydrous Na<sub>2</sub>S0<sub>4</sub> dried and concentrated to a solid residue, which gives the desired product (47 g) of melting point 110-112 ° C when crystallized from isopropanol.
Analysis: Compound as hydrochloride, calculated for C<sub>15</sub>H<sub>26</sub>NO<sub>4</sub>Cl
C, 51.2; H, 7.39; N, 3.98; Cl, 10.09% Found: C, 51.77; H, 7.16; N, 3.75; Cl, 11.45%
Example 4
(±) cis-3-Hydroxy-4- (2,4,6-trimethoxyphenyl) -1-methylpiperidine
Sodium borohydride (10 g) is added with stirring to a refluxing solution of 1-methyl-4- (2,4,6-trimethoxyphenyl) piperidin-3-one in absolute ethanol. Then the mixture is stirred for a further hour and heated to reflux. When cooling, the reaction mixture is diluted with water, then concentrated to remove the ethanol and extracted with chloroform. The chloroform extract is washed with water, dried over anhydrous sodium sulfate and concentrated to a solid residue which, when crystallized from acetone, gives the desired product (29.2 g) with a melting point of 124-125 ° C.
Analysis: compound as HCl salt; calculated for C<sub>15</sub>H<sub>24</sub>NO<sub>4</sub>Cl C, 56.69; H, 7.55; N, 4.4; Cl, 11.18% Found: C, 56.78; H, 7.72; N, 3.93; Cl, 11.91%
Example 5
(±) cis-3-Hydroxy-4- (3'-acetyl-4 ', 6'-dimethoxy-2'-hydroxy) phenyl-1-methylpiperidine
You drop BF<sub>3</sub>Etherate (107.6 ml) to a solution of cis-3-hydroxy-4- (2,4,6-trimethoxyphenyl) -1-methylpiperidine (35 g) in methylene chloride (500 ml) with cooling in an ice bath. Then 76.2 ml of acetic anhydride are added dropwise. Then the reaction mixture is stirred for 24 hours at room temperature, diluted with water, made alkaline with sodium carbonate and extracted with methylene chloride. The extract is concentrated and the residue (37 g) is dissolved in methanol (200 ml) and stirred for 2 hours with 5% aqueous potassium hydroxide solution (500 ml). Then the mixture is concentrated in vacuo and the residue is extracted with chloroform. The residue obtained after concentrating the chloroform extract is then purified by chromatography on silica gel, giving cis-3-hydroxy-4- (3'-acetyl-4 ', 6'-dimethoxy-2'-hydroxy) -phenyl-1-methylpiperidine (28 g) of melting point 215-218 ° C (as HCl salt).
Analysis: compound as HCl salt, calculated for C<sub>16</sub>H<sub>24</sub>NO<sub>5</sub>Cl C, 55.57; H, 6.94; N, 4.05; Cl, 10.27% Found: C, 55.24; H, 7.04; N, 3.88; Cl, 10.40%
Example 6:
General procedure for the preparation of cis / trans5,7-dimethoxy-2- (R<sub>1</sub>) -8- [4 '- (3'-hydroxy-1-methyl) -piperidinyl] -4H-1-benzopyran-4-one The solution of cis / trans-3-hydroxy-4- (3'-acetyl- 4,6-dimethoxy-2'-hydroxy) phenyl-1-methylpiperidine (1 equivalent) is mixed with a suitable ester (3 equivalents) and Na metal (- 10 equivalents) or Na hydride (- 5 equivalents. ) stirred in dry dioxane or dimethylformamide at room temperature or at 70 - 80 ° C (see Table 8). Then water is carefully added and extracted with chloroform. The organic phase is separated off, somewhat concentrated, saturated with HCl gas and then stirred for one hour. The solution is then by adding Na<sub>2</sub>C0<sub>3</sub> made basic and extracted with chloroform. The chloroform extract is over anhydrous Na<sub>2</sub>SO<sub>4</sub> dried, concentrated in vacuo and purified with the aid of column chromatography (over silica gel). Thin layer chromatography (5% methanol in CHCl<sub>3</sub> + 1 vol% NH<sub>4</sub>0H: Rf value 0.5 - 0.7).
The compounds listed in Table 8 below and in Example 6a were prepared using the general procedure given:<tables id="tabl0013" num="0013"><img file="EP0241003A2_D0024.tif" /></tables>
Example 6a
cis-5,7-dimethoxy-2-methyl-8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one
A solution of cis-3-hydroxy-4- (3'-acetyl-4 ', 6'-dimethoxy-2'-hydroxy) -phenyl-1-methylpiperidine (10 g) in ethyl acetate (500 ml) is heated to reflux and add sodium (7 g) in small portions. Stir and reflux for 2 to 3 hours. After cooling, the mixture is diluted with water and the organic layer is separated. This is then concentrated to half the volume, treated with concentrated HCl (10 ml) and stirred for about an hour. Then diluted with water, the aqueous layer is made with Na<sub>2</sub>C0<sub>3</sub> alkaline and extracted with chloroform. The chloroform extract is over anhydrous Na<sub>2</sub>S0<sub>4</sub> dried, concentrated in vacuo and purified by column chromatography over silica gel to give the desired product (8 g). Recrystallized from chloroform / petroleum ether, melting point 236-238 ° C (HCl salt).
Analysis: compound as dihydrochloride, calculated for C<sub>18</sub>H<sub>25</sub>NO<sub>5</sub>Cl<sub>2</sub> C, 50.46; H, 6.66; N, 2.68; Cl, 15.87%
Example 7:
General demethylation process for the preparation of cis / trans-5,7-dihydroxy-2- (R<sub>1</sub>) -8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one hydrochloride: dimethoxychromone (1.0 g), pyridine hydrochloride (5-10 g) and quinoline (0.5 ml) are mixed and heated for 2-3 hours at 180-190 ° C. The reaction mixture is then allowed to cool, water (1 ml) is added and the mixture is made basic by adding solid sodium bicarbonate. The semi-solid product is extracted thoroughly with 20% methanol in chloroform, the organic phase is concentrated and with the aid of column chromatography (silica gel; 15% by volume methanol in chloroform with the addition of 1% by volume NH)<sub>4</sub>0H as an element; Rf: 0.4 - 0.7) cleaned. The hydrochloride salt is obtained by treatment with ethereal HCl.
The compounds listed in Table 9 below and in Example 7a are prepared using the general procedure given:
<tables id="tabl0014" num="0014"><img file="EP0241003A2_D0025.tif" /></tables><tables id="tabl0015" num="0015"><img file="EP0241003A2_D0026.tif" /></tables>
Example 7a
cis-5,7-dihydroxy-2-methyl-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one hydrochloride
Mix cis-5,7-dimethoxy-2-methyl-8- (4 '- (3'-hydroxy-1'-methyl) -piperidinyl] -4H-1-benzopyran-4-one (1.2 g) , Pyridine hydrochloride (8.0 g) and quinoline (0.5 ml) and heated for 2.5 hours at 180-190 ° C. The mixture is cooled, water (1 ml) is added, the mixture is made alkaline and by adding solid sodium bicarbonate the semisolid product is extracted thoroughly with 20% methanol in chloroform, the organic layer is concentrated and by column chromatography on silica gel with 15%, 1% Na<sub>4</sub>0H containing methanol in chloroform as eluent. The product thus obtained is treated with ethereal HCl to give the hydrochloride, yield 1.05 g, melting point 237-240 ° C.
Analysis: compound as HCl salt, calculated for C<sub>16</sub>H<sub>20</sub>NO<sub>5</sub>Cl <sub>C.</sub>, <sub>54</sub>,<sub>6; H</sub>, <sub>6</sub>,<sub>07; N</sub>, <sub>4</sub>,<sub>24; Cl</sub>, 10.77% Found: C, 55.62; H, 6.49; N, 3.59; Cl, 9.84%
Example 8
Cleavage of (±) -cis-3-hydroxy-1-methyl-4- (2,4,6-trimethoxyphenyl) piperidine
The racemic cis-3-hydroxy compound (90 g) is dissolved in methanol (300 ml), mixed with (-) - dibenzoyl tartaric acid (126.4 g) in methanol (200 ml) and heated to boiling. Then diisopropyl ether (approx. 500 ml) is slowly added and the clear solution is allowed to cool. The tartrate salt slowly crystallizes out. This is filtered off and recrystallized five times from methanol / diisopropyl ether,<maths id="math0002" num=""><img file="EP0241003A2_D0027.tif" /></maths> = + 48.3 ° (MeOH). The tartrate salt (43 g) is suspended in water (200 ml), hydrochloric acid (2N, 100 ml) is added and the mixture is stirred. The reaction mixture is extracted with ethyl acetate (5 times 100 ml each). The tartaric acid is recovered from the ethyl acetate extract. The aqueous layer is made alkaline with sodium carbonate and extracted with chloroform. The chloroform extract is dried over anhydrous sodium sulfate and concentrated, giving the (+) - 3-hydroxy compound, 17.7 g, melting point 109-111 ° C., <maths id="math0003" num=""><img file="EP0241003A2_D0028.tif" /></maths>+ 53.81 ° (methanol) is obtained.
The filtrates from the tartrate crystallizations are combined and the free base is recovered as described above. The free base (20 g) is dissolved in methanol (110 ml), (+) - dibenzoyl tartaric acid (29 g) is added and the solution is heated to boiling. Then slowly add diisopropyl ether (110 ml). When standing at room temperature, the tartrate crystallizes out. It is filtered off and recrystallized three times from methanol / diisopropyl ether mixture. Yield: 20.2 g,<maths id="math0004" num=""><img file="EP0241003A2_D0029.tif" /></maths>= -49 ° (MeOH). The free
Base is isolated as described above, yield: 8.2 g melting point 109-111 ° C., <maths id="math0005" num=""><img file="EP0241003A2_D0030.tif" /></maths>-54.13 '(methanol).
Optically pure isomers were obtained from optically pure (±) - or (-) - cis-3-hydroxy-4- (3-acetyl-4,6-dimethoxy-2-hydroxy) -phenyl-1-methyl-piperidine as in the following examples 9 and 10:
Example 9
(-) - cis-3-Hydroxy-4- (3'-acetyl-4 ', 6'-dimethoxy-2'-hydroxy) phenyl-1-methylpiperidine
Treat (-) - cis-3-hydroxy-4- (2 ', 4', 6'-trimethoxyphenyl) -1-methylpiperidine in the same manner as in Example 5, which is (-) - cis-3-hydroxy- 4 (3'-acetyl-4 ', 6'-dimethoxy-2'-hydroxy) -phenyl-1-methylpiperidine, melting point 184-86 ° C, <maths id="math0006" num=""><img file="EP0241003A2_D0031.tif" /></maths>= -32.63 ° (MeOH, c = 0.614).
Example 10
(+) - cis-3-Hydroxy-4- (3'-acetyl-4 ', 6'-dimethoxy-2'-hydroxy) phenyl-1-methylpiperidine
Treat (+) - cis-3-hydroxy-4- (2 ', 4', 6'-trimethoxyphenyl) -1-methylpiperidine in the same manner as in Example 5, which is (+) - cis-3-hydrox<sub>Y</sub>-4- (3'-acetyl-4 ', 6'-dimethoxy-2'-hydroxy) -phenyl-1-methylpiperidine with a melting point of 184-85 ° C., <maths id="math0007" num=""><img file="EP0241003A2_D0032.tif" /></maths>= + 34.47 ° (MeOH, c = 0.586).
Example 11
(-) - cis-5,7-Dimethoxy-2-methyl-8- (4 '- (3'-hydroxy-1'-methyl) -piperidinyll-4H-1-benzopyran-4-one
(-) - Cis-3-hydroxy-4- (3'-acetyl-4 ', 6'-dimethoxy-2'-hydroxy) -phenyl-1-methylpiperidine is treated in the same manner as in Example 6, was (-) - cis-5,7-dimethoxy-2-methyl-8- (4 '- (3'-hydroxy-1'-methyl) -piperidinyl] -4H-1-benzopyran-4-one from Melting point 228-30 ° C, <maths id="math0008" num=""><img file="EP0241003A2_D0033.tif" /></maths>= -80,59°
(MeOH, c = 0.59).
Example 12
(+) - cis-5,7-Dimethoxy-2-methyl-8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one
Treat (+) - cis-3-hydroxy-4- (3'-acetyl-4 ', 6'-dimethoxy-2'-hydroxy) phenyl-1-methylpiperidine in the same manner as in Example 6, was (+) - cis-5,6-dimethoxy-2-methyl-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one, melting point 228 -29 ° C, <maths id="math0009" num=""><img file="EP0241003A2_D0034.tif" /></maths>= + 84.1 ° (MeOH, c = 0.618).
Example 13
(-) - cis-5,7-Dihydroxy-2-methyl-8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one hydrochloride
Treated (-) - cis-5,7-dimethoxy-2-methyl-8- [4 '- (3'-hydroxy-1'-methyl) -piperidinyl] -4H-1-benzopyran-4-one on the same manner as in Example 7, which is (-) - cis-5,7-di-hydroxy-2-methyl-8- [4 '- (3'-hydroxy-1'-methyl) -piperidinyl] -4H-1 -benzopyran-4-one hydrochloride with a melting point of 242-45 ° C, <maths id="math0010" num=""><img file="EP0241003A2_D0035.tif" /></maths>= -27.5 ° (MeOH, c = 0.653).
Example 14
(+) - cis-5,7-Dihydroxy-2-methyl-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one hydrochloride
Treated (+) - cis-5,7-dimethoxy-2-methyl-8- [4 '- (3'-hydroxy-1'-methyl) -piperidinyl] -4H-1-benzopyran-4-one on the same manner as in Example 7, which is (+) - cis-5,7-di-hydroxy-2-methyl-8 - ['- (3'-hydroxy-1'-methyl) -piperidinyl] -4H-1- benzppyran-4-one hydrochloride with a melting point of 242-44 ° C, <maths id="math0011" num=""><img file="EP0241003A2_D0036.tif" /></maths>= + 29.57 ° (MeOH, c = 0.58).
Example 15
cis-5,7-dihydroxy-2-ethyl-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyll-4H-1-benzopyran-4-one hydrochloride
Cis-3-hydroxy-4- (3'-acetyl-4 ', 6'-dimethoxy-2'-hydroxy) -phenyl-1-methylpiperidine is treated as in Example 6 with ethyl propionate instead of ethyl acetate and the product is demethoxylated as in Example 7 described what cis-5,7-dihydroxy-2-ethyl-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one hydrochloride dated Delivers melting point 230-33 °.
Analysis: Calculated for C<sub>19</sub>H<sub>25</sub>NO<sub>5</sub>.HCl.0.5H<sub>2</sub>OC, 53.3; H, 6.53; N, 3.66; Cl, 9.28% Found: C, 53.1; H, 6.51; N, 3.83; Cl, 9.45%
Example 16
cis-5, '7-Dihydroxy-2-n-propyl-8- [4' - (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one hydrochloride
Cis-3-hydroxy-4- (3'-acetyl-4 ', 6'-dimethoxy-2'-hyroxy) phenyl-1-methylpiperidine is treated as in Example 6 with ethyl butyrate instead of ethyl acetate and the product is demethoxylated as in Example 7 describes what cis-5,7-dihydroxy-2-n-propyl-8- [4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one- supplies hydrochloride with a melting point of 190-92 ° C.
Analysis: Calculated for C<sub>20</sub>H<sub>27</sub>NO<sub>5</sub>.HCl.H<sub>2</sub>O
C, 55.74; H, 6.70; N, 3.61; Cl, 9.16% Found: C, 56.25; H, 6.65; N, 3.52; Cl, 9.39%
Example 17
cis - (-) - 5,7-Dihydroxy-2-methyl-8- (4 '- (3'-hydroxy) piperidinyl] -4H-1-benzopyran-4-one
The mixture is heated to cis - (-) - 5,7-dihydroxy-2-methyl-8- (4 '- (3'-hydroxy-1'-methyl) piperidinyl] -4H-1-benzopyran-4-one (5 g) with acetic anhydride (25 ml) and sodium acetate (4.5 g) for 12 hours at 90 ° C. The acetic anhydride is distilled off under high vacuum and the residue is stirred with ethyl acetate, the portion soluble in ethyl acetate is evaporated to dryness and the residue is dissolved in dry chloroform (27 ml), add anhydrous potassium carbonate (5 g) and cool to 0 ° C. Cyanogen bromide (6 g) in dry chloroform (25 ml) is added dropwise. After the addition, the reaction mixture is stirred for 4-5 hours at 40-50 ° C, filtered and the filtrate is washed with a small amount of brine, dried over anhydrous sodium sulfate and concentrated. The residue is heated on the steam bath with 1N hydrochloric acid (30 ml) for 7-8 hours. The reaction mixture is made alkaline by adding solid sodium carbonate and concentrated. The residue is passed through an HP-20 column and the product is eluted with 20% Me-OH in H<sub>2</sub>0. The product is crystallized from HeOH / diisopropyl ether, melting point 300 ° C., [α]<sup>20</sup><sub>D</sub> =-11,38°
(MeOH, c = 0.9).
Analysis: Compound as hydrochloride salt, calculated for C<sub>15</sub>H<sub>18</sub>NO<sub>5</sub>Cl C, 55.00; H, 5.53; N, 4.27; Cl, 10.81% Found: C, 54.33; H, 5.59; N, 3.93; Cl, 11.21%
Analysis: Calculated for C<sub>20</sub>H<sub>27</sub>NO<sub>5</sub>.-HCl.H<sub>2</sub>O <sup>C.</sup><sub>,</sub><sup>55</sup><sub>,</sub><sup>74; H</sup><sub>,</sub><sup>6</sup><sub>,</sub><sup>70; N, 3.61</sup>; Cl, 9.16% Found: C, 56.25; H, 6.65; N, 3.52; Cl, 9.39%
Example 18
cis - (-) - 5,7-Dihydroxy-2-methyl-8- [4 '- (1'-cyclopropylmethyl 3'-hydroxy) piperidinyl] -4H-1-benzopyran-4-one hydrochloride
Mixing cis - (-) - 5,7-dihydroxy-2-methyl-8- (4 '- (3'-hydroxy) -piperidinyl] -4H-1-benzopyran-4-one (1.0 g), Cyclopropyl methyl ketone (1.5 ml), isobutanol (15 ml) and potassium carbonate (3 g) and heated for 15 hours at 90 ° C. The reaction mixture is filtered and the residue washed with chloroform, the filtrate is concentrated and column chromatographed on silica gel Compound is eluted with 6% MeOH in chloroform. The hydrochloride is prepared by adding ethereal HC1, yield 0.7 g, melting point 249-51 ° C. <maths id="math0012" num=""><img file="EP0241003A2_D0037.tif" /></maths>= -35.4 ° (MeOH, c = 0.571).
Analysis: Calculated for C <sub>9</sub>H<sub>26</sub>NO<sub>6</sub>Cl C, 57.07; H, 6.51; N, 3.75; Cl, 8.87% Found: C, 57.18; H, 6.51; N, 3.75; Cl, 9.44%
48 sheets
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Numbers
- Publication
- 0241003
- Publication, DOCDB
- 0241003
- Publication, EPODOC
- EP0241003
- Application
- 87105180
- Application, DOCDB
- 87105180
- Application, EPODOC
- EP19870105180
Titles6
- German
- 4H-1-Benzopyran-4-on-Derivate, ein Verfahren zu ihrer Herstellung und ihre Verwendung als Arzneimittel
- English
- 4H-1-benzopyran-4-one derivatives, process for their preparation and their use as medicaments
- French
- Dérivés de 4H-1-benzopyran-4-one, procédé pour leur préparation et leur utilisation comme médicaments
- German
- 4H-1-Benzopyran-4-on-Derivate, ein Verfahren zu ihrer Herstellung und ihre Verwendung als Arzneimittel.
- English
- 4H-1-benzopyran-4-one derivatives, process for their preparation and their use as medicaments.
- French
- Dérivés de 4H-1-benzopyran-4-one, procédé pour leur préparation et leur utilisation comme médicaments.
Classification
- CPC, 6
- C07D405/04
- A61P25/04
- C07D211/42
- A61P37/06
- C07D405/14
- A61P37/08
- IPC, 13
- A61K31 44
- A61K31 443
- A61P25 04
- A61P37 06
- A61P37 08
- C07D211 42
- C07D211 70
- A61K31 445
- C07D211 74
- C07D405 04
- C07D405 12
- C07D405 14
- C07F9 553
Designated states13
- Contracting states, 13
- Austria
- Belgium
- Switzerland
- Germany
- Spain
- France
- United Kingdom
- Greece
- Italy
- Liechtenstein
- Luxembourg
- Netherlands (Kingdom of the)
- Sweden