Synthesis and Biological Activities of Novel Pleuromutilin Derivatives with a Substituted Thiadiazole Moiety as Potent Drug-Resistant Bacteria Inhibitors

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• 作者：Ruofeng Shang ; Xiuying Pu ; Ximing Xu ; Zhijun Xin ; Chao Zhang ; Wenzhu Guo ; Yu Liu ; Jianping Liang
• 刊名：Journal of Medicinal Chemistry
• 出版年：2014
• 出版时间：July 10, 2014
• 年：2014
• 卷：57
• 期：13
• 页码：5664-5678
• 全文大小：594K
• ISSN：1520-4804

文摘

A series of novel pleuromutilin derivatives possessing thiadiazole moieties were synthesized via acylation reactions under mild conditions. The in vitro antibacterial activities of the derivatives against methicillin-resistant Staphylococcus aureus, methicillin-resistant Staphylococcus epidermidis, Escherichia coli, and Streptococcus agalactiae were tested by the agar dilution method and Oxford cup assay. The majority of the tested compounds displayed moderate antibacterial activities. Importantly, the three compounds with amino or tertiary amine groups in their side chains, 11, 13b, and 15c, were the most active antibacterial agents. Docking experiments carried out on the peptidyl transferase center (PTC) of 23S rRNA proved that there is a reasonable direct correlation between the binding free energy (螖G_b, kcal/mol) and the antibacterial activity. Moreover, the pharmacokinetic profiles of 11 and 15c in rat were characterized by moderate clearance and oral bioavailability.