Synthesis of Quercetin 3-<i>O</i>-[6<sup>″</sup>-<i>O</i>-(<i>trans</i>-<i>p</i>-Coumaroyl)]-<i>β</i>-D-Glucopyranoside
作者:Xuhong Ren、Liu-lan Shen、Osamu Muraoka、Maosheng Cheng
DOI:10.1080/07328303.2011.616979
日期:2011.4
This report describes the efficient synthesis of quercetin 3-O-[6 ''-O-(trans-pcoumaroyl)]-beta-D-glucopyranoside 1 (isoquercitrin coumarate), an acylated quercetin glycoside possessing antihypertensive, antidiabetic, and tyrosinase inhibitory activities. The synthesis is initiated from commercially available quercetin via regioselective benzylation of quercetin to produce 4', 7-di-O-benzylquercetin (4). Through 4, 1 was successfully achieved via selective beta-glycosylation of the 3-OH, acylation of 6 ''-OH, and finally debenzylation via catalytic transfer hydrogenation.