Synthesis, characterization and structure–activity relationship analysis of novel depsides as potential antibacterials
作者:Peng-Cheng Lv、Zhu-Ping Xiao、Rui-Qin Fang、Huan-Qiu Li、Hai-Liang Zhu、Chang-Hong Liu
DOI:10.1016/j.ejmech.2008.04.019
日期:2009.4
Twenty-six depsides were synthesized to screen for their antibacterial activity. All of them were reported for the first time. Their chemical structures were clearly determined by H-1 NMR, C-13 NMR, ESI mass spectra and elemental analyses, coupled with one selected single-crystal structure. All the compounds were assayed for antibacterial activities against three Gram-positive bacterial strains (Bacillus subtilis ATCC 6633, Staphylococcus aureus ATCC 6538 and Streptococcus faecalis ATCC 9790) and three Gram-negative bacterial strains (Escherichia coli ATCC 35218, Pseudomonas aeruginosa ATCC 13525 and Enterobacter cloacae ATCC 13047) by MTT method. Compound 2-(2-methoxy-2-oxoethyl)phenyl 3-nitrobenzoate (C10) and 2-(2-ethoxy-2-oxoethyl)phenyl 3-nitrobenzoate (C23) showed powerful antibacterial activities against B. subtilis with MIC of 0.78 mu g/mL while compound 2-(2-methoxy-2-oxoethyl)phenyl 2-(3,4-diethoxyphenyl)acetate (C8) and 2-(2-ethoxy-2oxoethyl)phenyl 2-(3,4-diethoxyphenyl)acetate (C21) exhibited significant antibacterial activities against E. coli with MIC of 1.562 mu g/mL, which were superior to the positive controls penicillin G and kanamycin B, respectively. On the basis of the biological results, structure-activity relationships were discussed. (c) 2008 Elsevier Masson SAS. All rights reserved.