Four ofloxacin derivatives 3, 5, 6, and 11 were found to exhibit > 90% inhibition on the growth of M. tuberculosis at a concentration of 6.25 μg/mL. Compounds 3, 5 and 11 have also exhibited a broad spectrum of antibacterial activities while 8‐fluoro‐3‐methyl‐9‐[4‐(4‐nitrophenylsulfonyl)piperazin‐1‐yl)‐6‐oxo‐2,3‐dihydro‐6H‐1‐oxo‐3a‐azaphenalene‐5‐carboxylic acid (6), which exhibited potent activity
四氧氟沙星衍生物3,5,6,和11被发现在生长表现出> 90%的抑制结核分枝杆菌在6.25微克/毫升的浓度。化合物3、5和11还表现出广谱的抗菌活性,而8-氟-3-甲基-9- [4-(4-硝基苯基磺酰基)哌嗪-1-基)-6-氧-2-3,二氢-6 H -1氧代3a氮杂苯并5羧酸(6)对TB的生长表现出有效的活性,MIC为2.23μg/ mL,选择性指数(SI)> 14.80,没有活性阻止G(+)-和G(-)-细菌的生长。选择性的抗TB活性是通过在C-7的哌嗪-4-基上引入芳基磺酰基来实现的N-去甲基氧氟沙星。化合物6是特定物种的,对结核分枝杆菌以外的细菌物种的生长没有显着活性,这意味着开发新的特定抗结核药物候选物而不与其他目前使用的抗菌药物产生交叉耐药性的可能性。6的结构优化正在进行中。