Free radical rearrangement synthesis and microbiological evaluation of novel 2-sulfoether-4-quinolone scaffolds as potential antibacterial agents
作者:Kehan Xu、Shaosheng He、Shichao Chen、Guoliang Qiu、Jingbo Shi、Xinhua Liu、Xiaoyu Wu、Jing Zhang、Wenjian Tang
DOI:10.1016/j.ejmech.2018.05.021
日期:2018.6
To develop novel antibacterial agents, 2-sulfoether-4-quinolone scaffolds were synthesized by a free radical process and evaluated for their antibacterial abilities. Excellent activities against Gram-positive bacteria were observed, among which compounds 3m, 3n, 3p and 3t possessed the lowest MICs against both S. aureus and B. cereus (0.8 μM and 1.61 μM, respectively). The structure-activity relationship
为了开发新型抗菌剂,通过自由基方法合成了2-磺基醚-4-喹诺酮骨架,并对其抗菌能力进行了评估。观察到优异的针对革兰氏阳性细菌的活性,其中化合物3m,3n,3p和3t对金黄色葡萄球菌和蜡状芽孢杆菌的MIC最低(分别为0.8μM和1.61μM)。结构-活性关系(SAR)表明:(i)抗菌活性与取代基有关,例如2-SCH3 = 2-SCH2CH3> 2-S(= O)CH3> 2-OH,8-Br> 7-Br> 6-Br; (ii)-CF3增加了抗菌活性;(iii)二取代基表现出更好的活性。DNA超螺旋抑制分析证实了它们的氟喹诺酮特性。对接表明,化合物3n通过广泛的相互作用(包括常规的氢键,卤素键和疏水性相互作用)很好地结合到DNA-谷氨酰胺酶复合物中。化合物3n对金黄色葡萄球菌的显微镜分析显示出对细胞壁结构的损害,这可能有助于渗透入革兰氏阳性细菌。