Synthesis and antimycobacterial evaluation of new trans-cinnamic acid hydrazide derivatives
作者:Samir A. Carvalho、Edson F. da Silva、Marcus V.N. de Souza、Maria C.S. Lourenço、Felipe R. Vicente
DOI:10.1016/j.bmcl.2007.11.091
日期:2008.1
evaluation of new trans-cinnamic acidderivatives of isonicotinic acid series (5) and benzoicacid series (6), designed by exploring the molecular hybridization approach between isoniazid (1) and trans-cinnamic acidderivative (3). The minimum inhibitory concentration (MIC) of the compounds 5a-d and 6c exhibited activity between 3.12 and 12.5 microg/mL and could be a good start point to find new lead compounds
Tuberculosis, HIV coinfection with TB, emergence of multidrug-resistant TB, and extensively drug-resistant TB are the major causes of death from infectious diseases worldwide. Because no new drug has been introduced in the last several decades, new classes of molecules as anti-TB drugs are urgently needed. Herein, we report the synthesis and structure-activity relationships of a series of thioester, amide, hydrazide, and triazolophthalazine derivatives of 4-alkoxy cinnamic acid. Many compounds exhibited submicromolar minimum inhibitory concentrations against Mycobacterium tuberculosis strain (H(37)Rv). Interestingly, compound 13e, a 4-isopentenyloxycinnamyl triazolophthalazine derivative, was found to be 100-1800 times more active than isoniazid (INH) when tested for its ability to inhibit the growth of INH-resistant M. tuberculosis strains. The results also revealed that 13e does not interfere with mycolic acid biosynthesis, thereby pointing to a different mode of action and representing an attractive lead compound for the development of new anti-TB agents.