设计并合成了一系列含有(苯并[ d ]咪唑-2-基)甲基的7-哌嗪基喹诺酮类化合物作为新的抗菌剂。评价了标题化合物对革兰氏阳性(金黄色葡萄球菌,表皮葡萄球菌和枯草芽孢杆菌)和革兰氏阴性(大肠埃希菌,铜绿假单胞菌和肺炎克雷伯菌)的抗菌活性。在测试的化合物中,N1-环丙基衍生物4a对金黄色葡萄球菌,表皮葡萄球菌,枯草芽孢杆菌和大肠杆菌(\(\ text {MIC} = 0.097 \) \(\ upmu \) g / mL),效力是参考药物诺氟沙星的2-4倍。构效关系研究表明,硝基对苯并咪唑环的作用取决于哌嗪基喹诺酮的取代方式。
A series of novel benzimidazole quinolones as potential antimicrobial agents were designed and synthesized. Most of the prepared compounds exhibited good or even stronger antimicrobial activities in comparison with reference drugs. The most potent compound 15m was membrane active and did not trigger the development of resistance in bacteria. It not only inhibited the formation of biofilms but also disrupted the established Staphylococcus aureus and Escherichia coli biofilms. It was able to inhibit the relaxation activity of E. coli topoisomerase IV at 10 mu M concentration. Moreover, this compound also showed low toxicity against mammalian cells. Molecular modeling and experimental investigation of compound 15m with DNA suggested that this compound could effectively bind with DNA to form a steady 15m-DNA complex which might further block DNA replication to exert the powerful bioactivities. (C) 2016 Elsevier Masson SAS. All rights reserved.