Quinolinecarboxylic acid derivatives which are represented by the general formula (I) ##STR1## wherein R.sub.1 is a C.sub.1 to C.sub.6 alkyl group which may be substituted, a C.sub.2 to C.sub.6 alkenyl group which may be substituted, a C.sub.3 to C.sub.7 cycloalkyl group which my be substituted or an aryl group which may be substituted, R.sub.2 is hydrogen atom; a halogen atom; hydroxyl group which may be protected, amino group or a C.sub.1 to C.sub.6 alkylamino group each of which may be protected; a C.sub.1 to C.sub.6 dialkylamino group or a C.sub.1 to C.sub.6 alkyl group, R.sub.3 is hydrogen atom or a C.sub.1 to C.sub.6 alkyl group, A is nitrogen atom or ##STR2## wherein A' is hydrogen atom. a halogen atom, a C.sub.1 to C.sub.6 alkyl group, a C.sub.1 to C.sub.6 alkoxyl group which may be substituted, cyano group, or nitro group, and A' may form a ring with R.sub.1 ; the ring may include oxygen atom, nitrogen atom, or sulfur atom as a constituent atom; the ring may be substituted with a C.sub.1 to C.sub.6 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.
通式(I)所代表的
喹啉羧酸衍
生物,其中R.sub.1是C.sub.1至C.sub.6烷基基团,可以是取代基;C.sub.2至C.sub.6烯基基团,可以是取代基;C.sub.3至C.sub.7环烷基团,可以是取代基;或芳基基团,可以是取代基。R.sub.2是氢原子;卤素原子;羟基,可以是保护基;
氨基或C.sub.1至C.sub.6烷基
氨基,每个可以是保护基;C.sub.1至C.sub.6二烷基
氨基基团或C.sub.1至C.sub.6烷基基团,R.sub.3是氢原子或C.sub.1至C.sub.6烷基基团,A是氮原子或##STR2##其中A'是氢原子;卤素原子;C.sub.1至C.sub.6烷基基团;可以被取代的C.sub.1至C.sub.6烷氧基基团;
氰基或硝基,A'可以与R.sub.1形成环;环可以包括氧原子、氮原子或
硫原子作为组成原子;环可以被C.sub.1至C.sub.6烷基基团取代,X是羟甲基基团;
氨甲基基团或
氨基,每个可以是保护基,以及作为活性成分的
喹啉羧酸衍
生物及其盐的抗菌剂,以及其治疗方法。