Abstract
TB is a global public health emergency in which new drugs are desperately needed. Herein we report on the synthesis of a diverse panel of 41 aryl allylic azides, thiocyanates, isothiouronium salts, and N,N′-diacetylisothioureas that were evaluated for their in vitro activity against replicating and non-replicating Mycobacterium tuberculosis (Mtb) H37Rv and toxicity to VERO cells. We found a selective group of new and promising compounds having good (micromolar) to excellent (sub-micromolar) potency against replicating Mtb H37Rv. Allylic thiocyanates bearing halophenyl (halo=2-Br, 4-Br, 4-Cl, 4-F), 4-methylphenyl and 2-naphthyl moieties were the most active as antitubercular agents. In particular, the 2-bromophenyl-substituted thiocyanate showed MIC=0.25μM against replicating Mtb, MIC=8.0μM against non-replicating Mtb and IC50=32μM in the VERO cellular toxicity assay.
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