Pyridone carboxylic acid compounds and their uses for treating infectious diseases caused by bacteria

摘要

Pyridone carboxylic acid compounds or physiologically hydrolyzable esters thereof are provided which are represented by the formula: (I) wherein R1 is a lower alkyl, a halogen-substituted lower alkyl, a lower alkenyl, a cycloalkyl, or a substituted- or unsubstituted-phenyl group; R2 is a hydrogen atom, or a lower alkyl or an amino group; A is a nitrogen atom or the group C-X wherein X is a hydrogen or a halogen atom, or an alkoxy group; and Z is a group having the formula: (IV) wherein n is 1 or 2; R3 and R4 each represent a hydrogen atom or a lower alkyl group, with proviso that, if n is 2, one of R3 and R4 is a hydrogen atom; R5 and R6 each represent a hydrogen atom, or a hydroxy, a lower alkoxy or an amino group which is unsubstituted or substituted by a lower alkyl group, with proviso that one of R5 and R6 is a hydrogen atom; and R7 is a hydrogen atom or a lower alkyl group. The compounds of the present invention show potent and broad spectrum of antibacterial activities.