E-2-[3-(3,4-Dichlorophenyl)-1-oxo-2-propenyl]-3-methylquinoxaline-1,4-dioxide: A lead antitubercular agent which alters mitochondrial respiration in rat liver
作者:Umashankar Das、Swagatika Das、Brian Bandy、Dennis K.J. Gorecki、Jonathan R. Dimmock
DOI:10.1016/j.ejmech.2010.07.030
日期:2010.10
A series of 2-(3-aryl-1-oxo-2-propenyl)-3-methylquinoxaline-1,4-dioxides 1a-1 and 2-acetyl-3-methyl-quinoxaline-1,4-dioxide 2 were evaluated against Mycobacterium tuberculosis H(37)Rv. With the exception of the 4-nitro analog 1k, significant antitubercular potencies were observed in series 1 and 2 which have IC(50) values in the range of 1-23 mu M Negative correlations were noted between the IC(50) values of 1a-j, 1 towards M tuberculosis and both the sigma and pi constants of the substituents in the benzylidene aryl ring. In particular, 1h emerged as a lead compound having IC(50) and IC(90) figures of 1.03 mu M and 1 53 mu M, respectively. This molecule affected respiration in rat liver mitochondria which is likely one way that 1h and the bioactive analogs exert their antitubercular properties. The quinoxaline 2, which lacks an alpha,beta-unsaturated group, has no effect on mitochondrial respiration using concentrations which inhibit the growth of M. tuberculosis. (C) 2010 Elsevier Masson SAS All rights reserved.