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.
本发明提供了一种具有2-
吡啶酮骨架部分结构并对革兰氏阳性菌、革兰氏阴性菌或厌氧菌具有强烈抗菌作用的4-氧
喹啉酮抗菌剂。该化合物具有以下式子(I)或其药学上可接受的盐:其中:R1代表氢原子或羧基保护基,R2代表氢原子、卤素原子、低碳基、低碳氧基或羟基,R3代表苯基或从5元和6元杂环基组成的芳香取代基,R3具有从氢原子、低碳基、低碳氧基、硝基、
氰基、
氨基、酰基、
氨基甲酰基和
尿素基组成的取代基,R4代表氢原子或卤素原子。