Synthesis and physico-chemical properties of nitrocaffeic acids
摘要:
The synthesis and spectroscopic properties of the three isomers of nitrocaffeic acid are described. The three pK(a) s of each isomer were measured by UV-visible spectroscopy. The comparison of the UV-visible spectra of nitrocaffeic acids and those obtained from the reaction of caffeic acid with reactive nitrogen species led to the conclusion that the nitration of caffeic acid with acidic nitrite does not significantly occur and confirmed the absence of nitration when caffeic acid reacts with peroxynitrite. Attempts to obtain free radical species from nitrocaffeic acids by classical methods showed a different reactivity to that of nitroaromatics and catechols. Nitrocaffeic acids do not autoxidize under aqueous basic conditions and are insensitive to t-BuOK or O-2(-.) (two reactants known for their capabilities to oxidize catechols and reduce nitroaromatics). Nitroaromatic anion radicals may be obtained using sodium borohydride as reductant and are particularly stable under an uncontrolled atmosphere. Copyright (C) 2000 John Wiley & Sons, Ltd.
production is inspired by nature, so naturallyoccurring compounds have predominantly been produced to date. Here we have taken advantage of the promiscuity of the enzymes involved in phenylpropanoid synthesis and exploited the versatility of an engineered Escherichia coli strain harboring a synthetic monolignol pathway to convert supplemented natural and unnatural phenylpropenoic acids into their corresponding
[EN] COMPOUNDS AND METHODS FOR THE TREATMENT OF MICROBIAL INFECTION(S)<br/>[FR] COMPOSÉS ET MÉTHODES DE TRAITEMENT D'INFECTION(S) MICROBIENNE(S)
申请人:UNIV SAINS MALAYSIA
公开号:WO2016024857A3
公开(公告)日:2016-10-06
Synthesis of trans-caffeate analogues and their bioactivities against HIV-1 integrase and cancer cell lines
作者:Chun-nian Xia、Hai-bo Li、Feng liu、Wei-xiao Hu
DOI:10.1016/j.bmcl.2008.10.046
日期:2008.12
Forty caffeate analogues were synthesized via a convenient method starting from vanillin with moderate to good yields. The testing of biological activity of these compounds against HIV-1 integrase indicates that four compounds: bornyl caffeate, bornyl 2-nitrocaffeate, 5-nitrocaffeic acid and 5-nitrocaffeic acid phenethyl ester (5-nitroCAPE) possess a good HIV integrase inhibitory activity, IC50 19.9, 26.8, 25.0 and 13.5 mu M, respectively. Twelve caffeate analogues were tested by MTT assay on growth of human hepatocellular carcinoma BEL-7404, human breast MCF-7 adenocarcinoma, human lung A549 adenocarcinoma and human gastric cancer BCG823 cell lines, respectively. And the best result is IC50 5.5 mu M for CAPE against BEL-7404. (C) 2008 Elsevier Ltd. All rights reserved.
Webster, American Journal of Pharmacy and the Sciences Supporting Public Health (1937-1978), 1940, vol. 112, p. 291,293, 294