期刊
TETRAHEDRON
卷 70, 期 43, 页码 8097-8107出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2014.08.028
关键词
Esters; Amides; Phenolic acids; Caffeic acid phenethyl esters isotopomers
资金
- JSPS [18688006]
- Grants-in-Aid for Scientific Research [18688006] Funding Source: KAKEN
We developed a new one-pot reaction of phenolic acids to afford the corresponding esters and amides through acyl-protected and activated phenolic acid intermediates. The simultaneous protection/activation of phenolic acids with alkylchloroformates proceeded readily in the presence of DMAP at room temperature; subsequent addition of alcohols or amines afforded the corresponding esters or amides. The use of iso-butyloxycarbonyl as the protecting and activating group in the one-pot reactions afforded phenolic esters or amides in 91% average yield. As a practical example of this convenient synthesis, caffeic acid phenethyl ester (CAPE) was readily synthesized from commercially available caffeic acid and phenethyl alcohol in 95% yield, and an isotopomer of CAPE, [3,10-C-13(2)]CAPE, was synthesized in 91% yield from [3-C-13]caffeic acid and 2-[1-C-13]phenethyl alcohol. This method may be useful for the convenient esterification and amidation of diverse phenolic acids. (C) 2014 Elsevier Ltd. All rights reserved.
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