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Bioorg Med Chem. 2013 Nov 1;21(21):6385-97. doi: 10.1016/j.bmc.2013.08.048. Epub 2013 Sep 3.

Structure-activity relationships of 2-aminothiazoles effective against Mycobacterium tuberculosis.

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  • 1Center for Drug Design, Academic Health Center, University of Minnesota, Minneapolis, MN 55455, USA.

Abstract

A series of 2-aminothiazoles was synthesized based on a HTS scaffold from a whole-cell screen against Mycobacterium tuberculosis (Mtb). The SAR shows the central thiazole moiety and the 2-pyridyl moiety at C-4 of the thiazole are intolerant to modification. However, the N-2 position of the aminothiazole exhibits high flexibility and we successfully improved the antitubercular activity of the initial hit by more than 128-fold through introduction of substituted benzoyl groups at this position. N-(3-Chlorobenzoyl)-4-(2-pyridinyl)-1,3-thiazol-2-amine (55) emerged as one of the most promising analogues with a MIC of 0.024μM or 0.008μg/mL in 7H9 media and therapeutic index of nearly ∼300. However, 55 is rapidly metabolized by human liver microsomes (t1/2=28min) with metabolism occurring at the invariant aminothiazole moiety and Mtb develops spontaneous low-level resistance with a frequency of ∼10(-5).

Copyright © 2013 Elsevier Ltd. All rights reserved.

KEYWORDS:

Aminothiazole; Antibacterial agent; High-throughput screening; Mycobacterium tuberculosis

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