Synthesis and Biological Evaluation of 2-thiazolylimino-5-arylidene-4- thiazolidinone Derivatives as Potent Antimycobacterial Agents

Author(s): Monika Jain , Rohani P. Burman , Villendra S. Negi , Sarbjit S. Jhamb , Alka Mital , Manjinder S. Gill .

Journal Name: Anti-Infective Agents

Volume 13 , Issue 2 , 2015

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Abstract:

Background: The recent emergence of multi-drug resistant (MDR) and extensively drugresistant (XDR) cases of tuberculosis has lead to the search for new structural classes of anti-TB drugs that can be effective against these strains of Mycobacterium tuberculosis. In the present study a series of 2-thiazolylimino-5-arylidene-4-thiazolidinone derivatives, unsubstituted and mono-substituted with hydroxy, methoxy, fluoro, chloro and nitro groups on the aryl ring were synthesized and assayed for their in vitro antimycobacterial activity against drug-sensitive M. tb H37Rv strain. Methods: In vitro antimycobacterial activity against drug-sensitive M. tb H37Rv strain (susceptible both to rifampicin and isoniazid) was performed and expressed as % inhibition at minimum inhibitory concentration (MIC) values. Compounds were initially tested for IC99 at a concentration of 6.25 µg/ml in BACTEC-460 TB radiometric system, and Isoniazid (0.1 µg/ml) and rifampicin (2.0 μg/ml) were taken as reference standards. Results: We report the synthesis and antimycobacterial activities of 2- thiazolylimino-5-arylidene-4-thiazolidinone derivatives, expressed as % inhibitions, and their MIC values. All of the above synthesized compounds showed substantial antimycobacterial activity in the preliminary screening, and some of the compounds, 8-14, exhibited excellent antimycobacterial activities (86-98 % inhibition) at 6.25–12.5 µg/ml against drugsensitive M. tb H37Rv strain. Conclusion: The 2-thiazolylimino-5-arylidene-4-thiazolidinone derivatives were identified as a new antitubercular chemical entity in this study. Two of the active compounds, 9 and 14 and their derivatives have been identified as potential lead molecules for further drug development. It was observed that the hydroxyl and bulky alkoxy groups enhance antimycobacterial activity, while a halogen substituent decreases the activity. Further structural optimization and identification of molecules are underway in our laboratory..

Keywords: Antimycobacterial activity, Mycobacterium tuberculosis, Thiazolidinone derivatives.

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Article Details

VOLUME: 13
ISSUE: 2
Year: 2015
Page: [105 - 113]
Pages: 9
DOI: 10.2174/2211352513666150706190235
Price: $58

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