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.
喹啉羧酸衍
生物的一般公式(I)如下所示:其中R.sub.1是一个可能被取代的C.sub.1到C.sub.6烷基基团,一个可能被取代的C.sub.2到C.sub.6烯基基团,一个可能被取代的C.sub.3到C.sub.7环烷基基团或一个可能被取代的芳基基团,R.sub.2是氢原子;卤素原子;可能被保护的羟基,
氨基或一个可能被保护的C.sub.1到C.sub.6烷基
氨基基团;一个C.sub.1到C.sub.6二烷基
氨基基团或一个C.sub.1到C.sub.6烷基基团,R.sub.3是氢原子或一个C.sub.1到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,一个C.sub.1到C.sub.6烷基基团,一个可能被取代的C.sub.1到C.sub.6烷氧基团,
氰基或硝基,A'可以与R.sub.1形成一个环;该环可以包括氧原子、氮原子或
硫原子作为构成原子;该环可以被一个C.sub.1到C.sub.6烷基基团取代,X是羟甲基基团;
氨甲基基团或
氨基每个可能被保护,及其盐,以及以
喹啉羧酸衍
生物和其盐为活性成分的抗菌剂,以及通过这种方法进行的治疗方法。