Design, synthesis and biological evaluation of imidazo[2,1-b]thiazole and benzo[d]imidazo[2,1-b]thiazole derivatives as Mycobacterium tuberculosis pantothenate synthetase inhibitors

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• 作者：Ganesh Samala ; Parthiban Brindha Devi ; Shalini Saxena ; Nikhila Meda ; Perumal Yogeeswari ; Dharmarajan Sriram ; ^{dsriram@hyderabad.bits-pilani.ac.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Tuberculosis ; Pantothenate synthetase ; Imidazo[2 ; 1-b]thiazole ; Benzo[d]imidazo[2 ; 1-b]thiazole
• 刊名：Bioorganic & Medicinal Chemistry
• 出版年：2016
• 出版时间：15 March 2016
• 年：2016
• 卷：24
• 期：6
• 页码：1298-1307
• 全文大小：915 K

文摘

In the present study, we have designed imidazo[2,1-b]thiazole and benzo[d]imidazo[2,1-b]thiazole derivatives from earlier reported imidazo[1,2-a]pyridine based Mycobacterium tuberculosis (MTB) pantothenate synthetase (PS) inhibitors. We synthesized thirty compounds and they were evaluated for MTB PS inhibition study, in vitro anti-TB activities against replicative and non-replicative MTB, in vivo activity using Mycobacterium marinum infected Zebra fish and cytotoxicity against RAW 264.7 cell line. Among them compound 2-methyl-N′-(4-phenoxybenzoyl)benzo[d]imidazo[2,1-b]thiazole-3-carbohydrazide (5bc) emerged as potent compound active against MTB PS with IC₅₀ of 0.53 ± 0.13 μM, MIC of 3.53 μM, 2.1 log reduction against nutrient starved MTB, with 33% cytotoxicity at 50 μM. It also showed 1.5 log reduction of M. marinum load in Zebra fish at 10 mg/kg.