Synthesis, structure and structure–activity relationship analysis of caffeic acid amides as potential antimicrobials
作者:Jie Fu、Kui Cheng、Zhi-ming Zhang、Rui-qin Fang、Hai-liang Zhu
DOI:10.1016/j.ejmech.2010.01.066
日期:2010.6
A series of caffeic acid amides 1-23 were synthesized and nine of which (13-17, 19-21 and 23) were reported for the first time. The chemical structures of these compounds were confirmed by means of H-1 NMR, ESI MS and elemental analyses. Compound 15 was determined by single-crystal X-ray diffraction analysis. All of the compounds were assayed for antibacterial (Bacillus subtilis, Escherichia coli, Pseudomonas fluorescens and Staphylococcus aureus) and antifungal (Aspergillus niger, Candida albicans and Trichophyton rubrum) activities by MTT method. Compounds 10-12, 15, 18 and 21 showed considerable antibacterial activities against B.subtilis with MICs of 795, 625, 389, 118, 312 and 155 mu g/mL, respectively. Structure-activity relationship analysts disclosed that caffeic acid amilides with electron-donating groups at p-position of benzene ring have better inhibitory activities.