Synthesis and anti-tubercular activity of 3-substituted benzo[b]thiophene-1,1-dioxides.

Abstract:

:We demonstrated that the 3-substituted benzothiophene-1,1-dioxide class of compounds are effective inhibitors of Mycobacterium tuberculosis growth under aerobic conditions. We examined substitution at the C-3 position of the benzothiophene-1,1-dioxide series systematically to delineate structure-activity relationships influencing potency and cytotoxicity. Compounds were tested for inhibitory activity against virulent M. tuberculosis and eukaryotic cells. The tetrazole substituent was most potent, with a minimum inhibitory concentration (MIC) of 2.6 µM. However, cytotoxicity was noted with even more potency (Vero cell TC50 = 0.1 µM). Oxadiazoles had good anti-tubercular activity (MICs of 3-8 µM), but imidazoles, thiadiazoles and thiazoles had little activity. Cytotoxicity did not track with anti-tubercular activity, suggesting different targets or mode of action between bacterial and eukaryotic cells. However, we were unable to derive analogs without cytotoxicity; all compounds synthesized were cytotoxic (TC50 of 0.1-5 µM). We conclude that cytotoxicity is a liability in this series precluding it from further development. However, the series has potent anti-tubercular activity and future efforts towards identifying the mode of action could result in the identification of novel drug targets.

journal_name

PeerJ

journal_title

PeerJ

authors

Chandrasekera NS,Bailey MA,Files M,Alling T,Florio SK,Ollinger J,Odingo JO,Parish T

doi

10.7717/peerj.612

subject

Has Abstract

pub_date

2014-10-07 00:00:00

pages

e612

issn

2167-8359

pii

612

journal_volume

2

pub_type

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