QUINOLONE DERIVATIVES, PREPARATION PROCESSES THEREOF, AND ANTIBACTERIAL AGENTS CONTAINING THE SAME

摘要

Antibacterial quinolone derivatives represented by the following formula ¢I! and salts thereof are disclosed. ¢I! wherein R1 means a hydrogen atom or a carboxyl-protecting group; R2 denotes a hydrogen or halogen atom or a hydroxyl, lower alkoxyl, amino, aralkylamino, or mono- or di-(lower alkyl)amino group; A represents an oxygen or sulfur atom or N-R3 in which R3 is a hydrogen atom or an amino-protecting group; X is a hydrogen or halogen atom; Y means a nitrogen atom or C-R4 in which R4 is a hydrogen or halogen atom or a lower alkyl or lower alkoxyl group; and Z denotes a halogen atom or a substituted or unsubstituted heterocyclic group having at least one nitrogen atom as a hetero atom.