A novel series of benzotriazole derivatives were synthesized and characterized by NMR, IR and MS spectra. The bioactive assay manifested that most of the new compounds exhibited moderate to good antibacterial and antifungal activities against the tested strains in comparison to reference drugs chloromycin, norfloxacin and fluconazole. Especially, 2,4-dichlorophenyl substituted benzotriazole derivative 6f displayed good antibacterial activity against MRSA with MIC value of 4 μg/mL, which was 2-fold more potent than Chloromycin, and it also displayed 3-fold stronger antifungal activity (MIC = 4 μg/mL) than fluconazole (MIC = 16 μg/mL) against Beer yeast. The preliminary interactive investigations of compound 6f with calf thymus DNA revealed that compound 6f could effectively intercalate into DNA to form compound 6f–DNA complex which might block DNA replication to exert antimicrobial activities. Molecular docking experiments suggested that compound 6f projected into base-pairs of DNA hexamer duplex forming two hydrogen bonds with guanine of DNA. The theoretical calculations were in accordance with the experimental results.
一系列新型苯并三唑衍
生物被合成并通过NMR、IR和MS光谱进行表征。
生物活性测定表明,大多数新化合物对比参考药物
氯霉素、
诺氟沙星和
氟康唑,表现出中等到良好的抗菌和抗真菌活性。特别是,2,4-二
氯苯基取代的苯并三唑衍
生物6f在对抗耐
甲氧西林金黄色葡萄球菌(MRSA)时显示出良好的抗菌活性,其最小抑菌浓度(MIC)为4 μg/mL,比
氯霉素强2倍。此外,它在对抗酿酒酵母时显示出比
氟康唑(MIC = 16 μg/mL)强3倍的抗真菌活性(MIC = 4 μg/mL)。对化合物6f与小牛胸腺DNA的初步相互作用研究表明,化合物6f可以有效地插入DNA,形成化合物6f–DNA复合物,从而可能阻止DNA复制以发挥抗微
生物活性。分子对接实验表明,化合物6f能够嵌入DNA六聚体双链的碱基对中,与DNA的
鸟嘌呤形成两个氢键。理论计算结果与实验结果一致。