Structure–Activity Relationship Studies of a Series of Semisynthetic Lipopeptides Leading to the Discovery of Surotomycin, a Novel Cyclic Lipopeptide Being Developed for the Treatment of Clostridium difficile-Associated Diarrhea

Journal of Medicinal Chemistry
2015.0

Abstract

Novel cyclic lipopeptides with different acyl tails were synthesized via a semisynthetic approach. Structure-activity relationship studies revealed that lipophilicity, chain length, and the location of key aromatic functionalities of the tail modulated activity. The lead compound surotomycin exhibited significantly improved in vitro activity compared with daptomycin (MIC90 0.5 vs 2 μg/mL) against Clostridium difficile including NAP1 epidemic strains. In hamster efficacy studies, surotomycin protected animals at a dose of 0.5 mg/kg, PO.

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