Synthesis 2016; 48(07): 1002-1010
DOI: 10.1055/s-0035-1561325
paper
© Georg Thieme Verlag Stuttgart · New York

Microwave-Assisted Synthesis of Aromatic and Aliphatic Triesters of Resveratrol

Alicja Urbaniak
a   Department of Bioorganic Chemistry, Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland
,
Beata Warżajtis
b   Department of Crystallography, Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland   Email: karol.kacprzak@gmail.com
,
Urszula Rychlewska
b   Department of Crystallography, Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland   Email: karol.kacprzak@gmail.com
,
Karol Kacprzak*
a   Department of Bioorganic Chemistry, Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland
› Author Affiliations
Further Information

Publication History

Received: 17 November 2015

Accepted after revision: 14 December 2015

Publication Date:
26 January 2016 (online)


Abstract

Despite intense research on resveratrol, its aromatic esters remain largely unknown. Presented here is a practical, simple, and general protocol for the microwave-assisted preparation of aromatic and aliphatic triesters of resveratrol. Two developed protocols that use conventional and microwave heating, respectively, were compared. Classical reflux led to sluggish esterification, in contrast to microwave-assisted synthesis, which increased the yield and reduced the reaction time from hours to minutes. This microwave protocol was used to synthesize ten aromatic and aliphatic triesters of resveratrol, including resveratryl tricinnamate, tri-3,4-dimethoxycinnamate, tri-2,6-dichlorobenzoate, tri-4-nitrobenzoate, tri-2,3-dimethoxybenzoate, and tri-3,4,5-trimethoxybenzoate, which had not previously been described. Reliable crystallization of all aromatic and some aliphatic triesters was found to be a valuable alternative to time-consuming purification by column chromatography. Crystal structures of resveratryl triisobutyrate and tri-2,6-dichlorobenzoate were determined by X-ray diffraction and were critically compared.

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