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Synthesis and in vitro evaluation of substituted 3-Cinnamoyl-4-hydroxy-pyran-2-one (CHP) in pursuit of new potential antituberculosis agents

Abstract

Tuberculosis is an ever evolving infectious disease that demands urgent need for new drugs. In search for new antituberculosis agents, a library of 3-Cinnamoyl-4-hydroxy-6-methyl-2H-pyran-2-ones (CHPs) (2a-2y) was synthesised and evaluated against standard virulent laboratory strain of Mycobacterium tuberculosis H37Rv. Out of 25 compounds 11, 5, 7 and 2 (2a and 2u) showed least, moderate, good and appreciable activities based on minimum inhibitory concentrations (MICs). Both 2a and 2u exhibited an MIC value of 4µg/ml that was close to those of standard antituberculosis drugs ethambutol, streptomycin and levofloxacin. Neither 2a nor 2u showed any activity either against gram positive or gram negative bacteria and even against non tuberculous mycobacterium i.e. Mycobacterium smegmatis; thus like antituberculosis drugs rifampicin, isoniazid and pretomanid they are highly TB specific. All the pyrone based chalcones showed no recognizable level of cytotoxicity against normal human kidney cell line (HEK-293) up to 80 µM concentration and 11 exhibited an IC50 ≤ 100 µM (highest tested concentration). On further investigation, both 2a and 2u proved to be non toxic against four human cell lines but 2a proved to be better choice as it did not reach IC50 even at 100 µM (highest tested concentration) while IC50 of 2u was around 80 µM. In conclusion our results demonstrate that 2a is specifically against M.tuberculosis with no appreciable toxicity and its activity matches with few clinically approved antituberculosis drugs and therefore it merits further evaluation.

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Publication details

The article was received on 21 Jul 2017, accepted on 05 Dec 2017 and first published on 06 Dec 2017


Article type: Research Article
DOI: 10.1039/C7MD00366H
Citation: Med. Chem. Commun., 2017, Accepted Manuscript
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    Synthesis and in vitro evaluation of substituted 3-Cinnamoyl-4-hydroxy-pyran-2-one (CHP) in pursuit of new potential antituberculosis agents

    Z. S. Bhat, H. Ul Lahc, M. A. A. Rather, M. Maqbool, T. Ara, S. K. Yousuf and Z. A. Parry, Med. Chem. Commun., 2017, Accepted Manuscript , DOI: 10.1039/C7MD00366H

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