This invention relates to a novel quinolone- or naphthyridone-carboxylic acid derivative or its salt useful as an antibacterial agent, said derivative has a substituent represented by the following formula at the 7 position:
wherein preferably R3 represents at least one member selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted lower alkyl, lower alkoxy or lower alkylthio group, a nitro group, a cyano group, a protected or unprotected hydroxyl group and a protected or unprotected amino group; R4 represents a hydrogen atom, a substituted or unsubstituted lower alkyl group, a lower alkylidene group and a group forming a cycloalkane ring together with the carbon atom to which R4 is bonded; and R5 represents a hydrogen atom or a substituted or unsubstituted lower alkyl or cycloalkyl group.
本发明涉及一种可用作抗菌剂的新型
喹啉酮或
萘啶
酮羧酸衍
生物或其盐,所述衍
生物在 7 位具有下式所代表的取代基:
其中优选 R3 代表至少一个选自以下组成的成员:
氢原子、卤素原子、取代或未取代的低级烷基、低级烷
氧基或低级烷
硫基、硝基、
氰基、受保护或未受保护的羟基和受保护或未受保护的
氨基;R4 代表
氢原子、取代或未取代的低级烷基、低级亚烷基和与 R4 键合的
碳原子一起形成环 烷环的基团;以及 R5 代表
氢原子或取代或未取代的低级烷基或
环烷基。