The present invention provides a 4-oxoquinolizine antibacterial agent having a 2-pyridone skeleton as a partial structure and also having a strong antibacterial effect on gram-positive bacteria, gram-negative bacteria or anaerobic bacteria. The compound having the following formula (I) or a pharmaceutically acceptable salt thereof:
wherein:
R1 represents hydrogen atom or a carboxyl-protecting group,
R2 represents hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxyl group or hydroxyl group,
R3 represents phenyl group or an aromatic substituent selected from the group consisting of 5-membered and 6-membered heterocyclic groups and R3 has a substituent selected from the group consisting of a hydrogen atom, a lower alkyl group, a lower alkoxyl group, a nitro group, a cyano group, an amino group, an acyl group, a carbamoyl group and a ureido group, and
R4 represents a hydrogen atom or a halogen atom.
本发明提供了一种以 2-
吡啶酮骨架为部分结构,同时对革兰氏阳性菌、革兰氏阴性菌或厌
氧菌有较强抗菌作用的 4-
氧代喹嗪类抗菌剂。具有下式(I)的化合物或其药学上可接受的盐:
其中
R1 代表
氢原子或羧基保护基团、
R2 代表
氢原子、卤素原子、低级烷基、低级烷
氧基或羟基、
R3 代表
苯基或选自 5 元和 6 元杂环基团的芳香取代基,且 R3 具有选自
氢原子、低级烷基、低级烷
氧基、硝基、
氰基、
氨基、酰基、
氨基甲酰基和
脲基的取代基,以及
R4 代表
氢原子或卤素原子。