Synthesis and biological evaluation of aryl-oxadiazoles as inhibitors of Mycobacterium tuberculosis.

Bioorganic & medicinal chemistry letters 2018 Jun 01

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Despite increased research efforts to find new treatments for tuberculosis in recent decades, compounds with novel mechanisms of action are still required. We previously identified a series of novel aryl-oxadiazoles with anti-tubercular activity specific for bacteria using butyrate as a carbon source. We explored the structure activity relationship of this series. Structural modifications were performed in all domains to improve potency and physico-chemical properties. A number of compounds displayed sub-micromolar activity against M. tuberculosis utilizing butyrate, but not glucose as the carbon source. Compounds showed no or low cytotoxicity against eukaryotic cells. Three compounds were profiled in mouse pharmacokinetic studies. Plasma clearance was low to moderate but oral exposure suggested solubility-limited drug absorption in addition to first pass metabolism. The presence of a basic nitrogen in the linker slightly increased solubility, and salt formation optimized aqueous solubility. Our findings suggest that the 1,3,4-oxadiazoles are useful tools and warrant further investigation. Copyright © 2018 The Author(s). Published by Elsevier Ltd.. All rights reserved.

Citation

Maria Angeles Martinez-Grau, Isabel C Gonzalez Valcarcel, Julie V Early, Richard Klaus Gessner, Candice Soares de Melo, Eva Maria Martin de la Nava, Aaron Korkegian, Yulia Ovechkina, Lindsay Flint, Anisa Gravelle, Jeff W Cramer, Prashant V Desai, Leslie J Street, Joshua Odingo, Thierry Masquelin, Kelly Chibale, Tanya Parish. Synthesis and biological evaluation of aryl-oxadiazoles as inhibitors of Mycobacterium tuberculosis. Bioorganic & medicinal chemistry letters. 2018 Jun 01;28(10):1758-1764