NYA 3,4-DIAMINOQUINOLIN- OCH-PYRIDINFOERENINGAR.

摘要

4-aminopyridine derivatives represented by the general formula: CHEM [where R1 is a hydrogen atom, a hydroxyl group, a linear or branched lower alkyl group or a cycloalkyl group which may be substituted by a hydroxyl group, a lower alkoxy group, a lower alkyl or a cycloalkyl group which contains a carbonyl group, a morpholino group or a group -NH-B (where B is a lower alkyl group, a cycloalkyl group or a phenyl group); R2 and R3 which may be the same or different each represents a hydrogen atom, a lower alkyl group or a loweralkylcarbonyl group, or when taken together, form an azacycloalkyl group, a morpholino group or an N-methylpiperazinyl group together with the nitrogen atom; R4 and R5 each represents a hydrogen atom, or when taken together with the ring A, form a quinoline ring or a 5,6,7,8-tetrahydroquinoline ring, provided that when each of R1, R4 and R5 is a hydrogen atom, R2 and R3 are neither a hydrogen atom nor a methyl group at the same time, and when R1 is a hydrogen atom and R4 and R5 taken together with the ring A form a quinoline ring, R2 and R3 are neither a hydrogen atom nor an ethyl group at the same time], and an acid addition salts of said 4-aminopyridine derivatives. These compounds are useful as active ingredients in pharmaceutical compositions for improving psychoneural function, especially in the treatment of Alzheimer type dementia and promotion of mnemonic and learning performance.