Synthesis, structure and structure–activity relationship analysis of caffeic acid amides as potential antimicrobials
摘要:
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.
Evaluation of caffeic acid amide analogues as anti-platelet aggregation and anti-oxidative agents
作者:Chia-Cheng Hung、Wei-Jen Tsai、Li-Ming Yang Kuo、Yao-Haur Kuo
DOI:10.1016/j.bmc.2004.11.055
日期:2005.3.1
A series of amides of caffeic acid were synthesized and evaluated for their anti-platelet and anti-oxidative activities. N-(2-Bromo-phenyl)-3-(3,4-dihydroxy-phenyl)-acrylamide (12) and N-(3-Bromo-phenyl)-3-(3,4-dihydroxy-phenyl)-acrylamide (13) exhibited potent inhibitory activity (IC50 = 5.8 and 6.7 muM, respectively) against arachidonic acid-induced (AA) platelet aggregation, comparable with invalid caffeic acid. Most of the synthesized caffeic acid anifides exhibited the promising anti-platelet aggregation in AA-induced assay and anti-oxidative activities. This study also exhibited that caffeic anilides displayed more potent anti-oxidative activity in the radical scavenging activity assay than trolox and vitamin E. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis, structure and structure–activity relationship analysis of caffeic acid amides as potential antimicrobials
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.