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Synthesis and antimycobacterial activity of 4-(5-substituted-1,3,4-oxadiazol-2-yl)pyridines

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Abstract

4-(5-Substituted-1,3,4-oxadiazol-2-yl)pyridine derivatives 1-12 were synthesized and evaluated for their in vitro antimycobacterial activity. Some compounds showed an interesting activity against Mycobacterium tuberculosis H37Rv and five clinical isolates (drug-sensitive and -resistant strains). Compound 4 [4-(5-pentadecyl-1,3,4-oxadiazol-2-yl)pyridine] was 10 times more active than isoniazid, 20 times more active than streptomycin, and 28 times more potent than ethambutol against drug-resistant strain CIBIN 112. Compound 5 [4-(5-heptadecyl-1,3,4-oxadiazol-2-yl)pyridine] showed the same behavior as compound 4. Both of the above structures bear a high lipophilic chain bonded to the 5-position of the oxadiazole moiety. This fact implies that there exists a contribution of lipophilicity, which could facilitate the entrance of these molecules through lipid-enriched bacterial cell membrane. © 2007 Elsevier Ltd. All rights reserved.

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Navarrete-Vázquez, G., Molina-Salinas, G. M., Duarte-Fajardo, Z. V., Vargas-Villarreal, J., Estrada-Soto, S., González-Salazar, F., … Said-Fernández, S. (2007). Synthesis and antimycobacterial activity of 4-(5-substituted-1,3,4-oxadiazol-2-yl)pyridines. Bioorganic and Medicinal Chemistry, 15(16), 5502–5508. https://doi.org/10.1016/j.bmc.2007.05.053

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