申请人:SS PHARMACEUTICAL CO., LTD.
公开号:EP0486687A1
公开(公告)日:1992-05-27
Quinolonecarboxylic acid derivatives having an excellent antibacterial activity of general formula (I), their salts, antibacterial agents containing the same as the active ingredient, and intermediates therefor of general formula (V). In formula (I), R₁ is lower alkyl, R₂ is hydrogen or lower alkyl, R₃ is hydrogen or halogen, and R₄ and R₅ are combined together to form an optionally substituted 5- or 6-membered ring which may contain other heteroatom(s), provided that the case where R₁ is methyl, R₂ and R₃ are each hydrogen, and (a) is piperazinyl, is excluded. In formula (V), R₁ is lower alkyl, R₂₋₁ is lower alkyl, R₃ is hydrogen or halogen, X is halogen, and R₄ and R₅ are combined together to form an optionally substituted 5- or 6-membered ring which may contain other heteroatom(s).
通式(I)的具有优异抗菌活性的喹啉羧酸衍生物、它们的盐、含有相同活性成分的抗菌剂以及通式(V)的中间体。在式 (I) 中,R₁ 是低级烷基,R₂ 是氢或低级烷基,R₃ 是氢或卤素,R₄ 和 R₅ 结合在一起形成任选取代的 5 或 6 元环,其中可含有其他杂原子、但不包括 R₁ 为甲基、R₂ 和 R₃ 均为氢且 (a) 为哌嗪基的情况。在式 (V) 中,R₁ 是低级烷基,R₂₋₁ 是低级烷基,R₃ 是氢或卤素,X 是卤素,R₄ 和 R₅ 结合在一起形成任选取代的 5 或 6 元环,该环可能含有其他杂原子。