Carbostyril compounds

Claim 1

A carbostyril compound represented by the formula (I): ##STR55## wherein R 1 represents a hydrogen atom, R 2 represents a hydrogen atom, a phenylalkyl group selected from the group consisting of monophenylalkyl and diphenylalkyl groups having a straight or branched chain alkyl group having 1 to 6 carbon atoms in the alkyl moiety, an alkoxyalkyl group having a straight or branched chain alkoxy group of 1 to 6 carbon atoms in the alkoxy moiety thereof and a straight or branched chain alkylene group of 1 to 6 carbon atoms in the alkyl moiety thereof, a mono hydroxyalkyl group having a straight or branched chain alkyl group of 1 to 6 carbon atoms, an alkylcarbonyl group having a straight or branched chain alkyl group of 1 to 6 carbon atoms in the alkyl moiety thereof, or a straight or branched chain alkynyl group having 2 to 7 carbon atoms, R 3 represents a hydrogen atom, and R 4 represents a pyrrolidinoalkyl group having a straight or branched alkylene group of 1 to 6 carbon atoms, a piperazinoalkyl group having a straight or branched alkylene group of 1 to 6 carbon atoms, or a morpholinoalkyl group having a straight or branched alkylene group of 1 to 6 carbon atoms, or R 3 and R 4 can form, when taken together with the nitrogen atom to which they are attached, a piperidino group, a morpholino group, a pyrrolidino group or a piperazino group, said phenylalkyl, pyrrolidinoalkyl, piperazinoalkyl, morpholinoalkyl, piperidino, morpholino, pyrrolidino or piperazino group optionally containing 1 to 3 substituents selected from the class contsisting of an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a halogen atom, an alkylenedioxy group of 1 to 2 carbon atoms, a carbamoyl group and a phenyl group, the 3,4-bond of the carbostyril nucleus represents a single bond, and the pharmaceutically acceptable acid additional salts thereof.