QUINOLINECARBOXYLIC ACID DERIVATIVE AND SALT THEREOF

摘要

Quinolinecarboxylic acid derivatives which are represented by the general formula (I) <CHEM> wherein R1 is a C1 to C6 alkyl group which may be substituted, a C2 to C6 alkenyl group which may be substituted, a C3 to C7 cycloalkyl group which may be substituted or an aryl group which may be substituted, R2 is hydrogen atom; a halogen atom; hydroxyl group which may be protected, amino group or a C1 to C6 alkylamino group each of which may be protected; a C1 to C6 dialkylamino group or a C1 to C6 alkyl group, R3 is hydrogen atom or a C1 to C6 alkyl group, A is nitrogen atom or <CHEM> wherein A' is hydrogen atom, a halogen atom, a C1 to C6 alkyl group, a C1 to C6 alkoxyl group which may be substituted, cyano group, or nitro group, and A' may form a ring with R1; the ring may include oxygen atom, nitrogen atom, or sulfur atom as a constituent atom; the ring may be substituted with a C1 to C6 alkyl group, X is hydroxymethyl group; aminomethyl group or amino group each of which may be protected, and salts thereof, and antibacterial agents which comprise the quinolinecarboxylic acid derivatives and salts thereof as active ingredients, and therapeutical methods thereby.