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

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,...

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Bibliographic Details
Published in:Journal of medicinal chemistry 2014-07, Vol.57 (13), p.5664-5678
Main Authors: Shang, Ruofeng, Pu, Xiuying, Xu, Ximing, Xin, Zhijun, Zhang, Chao, Guo, Wenzhu, Liu, Yu, Liang, Jianping
Format: Article
Language:English
Subjects:
Animals
Bacteria - drug effects
Diterpenes - chemical synthesis
Diterpenes - pharmacokinetics
Diterpenes - pharmacology
Escherichia coli - drug effects
Methicillin Resistance - drug effects
Methicillin-Resistant Staphylococcus aureus - drug effects
Microbial Sensitivity Tests
Models, Molecular
Molecular Docking Simulation
Pleuromutilins
Polycyclic Compounds
Rats
Staphylococcus epidermidis - drug effects
Structure-Activity Relationship
Thermodynamics
Thiadiazoles - chemical synthesis
Thiadiazoles - pharmacokinetics
Thiadiazoles - pharmacology
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Summary: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 (ΔG 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.
ISSN:0022-2623
1520-4804
DOI:10.1021/jm500374c