Qiang Guo, Ming-Liang Liu, Lian-Shun Feng, Kai Lv, Yan Guan, Hui-Yuan Guo and Chun-Ling Xiao

A series of gatifloxacin, ciprofloxacin, and 8-OCH3 ciprofloxacin coumarin derivatives was designed, synthesized, characterized and evaluated for their in-vitro activity. The activity of one compound (6) was found to be 2–8-fold more potent than the respective parent GTFX, CPFX, and 8-OCH3 CPFX, indicating that the lipophilicity of the tested compounds is not the sole parameter affecting antimycobacterial activity.