Design, synthesis, and biological evaluation of novel benzimidazole derivatives and their interaction with calf thymus DNA and synergistic effects with clinical drugs
作者:HuiZhen Zhang、JianMei Lin、Syed Rasheed、ChengHe Zhou
DOI:10.1007/s11426-014-5087-x
日期:2014.6
A series of new benzimidazole derivatives was synthesized and characterized by IR, 1H NMR, 13C NMR, MS, and HRMS spectra. All the new compounds were screened for their antimicrobial activities in vitro by a twofold serial dilution technique. The bioactive evaluation showed that 3,5-bis(trifluoromethyl)phenyl benzimidazoles were comparably or even more strongly antibacterial and antifungal than the reference drugs Chloromycin, Norfloxacin, and Fluconazole. The combination of 2,4-difluorobenzyl benzimidazole derivative 5l and its hydrochloride 7 respectively with the antibacterials Chloromycin, Norfloxacin, and the antifungal Fluconazole was more sensitive to methicillin-resistant MRSA and Fluconazole-insensitive A. flavus. In addition, the interaction of compound 5l with calf thymus DNA demonstrated that this compound could effectively intercalate into DNA to form a compound 5l-DNA complex that might block DNA replication and thereby exert good antimicrobial activity.
一系列新的苯并咪唑衍生物被合成并通过红外(IR)、氢核磁共振(1H NMR)、碳核磁共振(13C NMR)、质谱(MS)和高效液相色谱(HRMS)谱图进行了表征。所有新化合物通过两倍系列稀释技术在体外进行了抗微生物活性筛选。生物活性评估显示,3,5-双(三氟甲基)苯基苯并咪唑的抗菌和抗真菌活性与参考药物氯霉素、诺氟沙星和氟康唑相当或更强。2,4-二氟苄基苯并咪唑衍生物5l及其盐酸盐7分别与抗菌药物氯霉素、诺氟沙星和抗真菌药物氟康唑的联合使用,对耐甲氧西林的金黄色葡萄球菌(MRSA)和氟康唑不敏感的黄曲霉菌(A. flavus)更为敏感。此外,化合物5l与小牛胸腺DNA的相互作用表明,该化合物能有效嵌入DNA中形成化合物5l-DNA复合物,可能阻断DNA复制,从而发挥良好的抗微生物活性。