Synthesis of Kaempferol 3-<i>O</i>-(3′′,6′′-Di-<i>O</i>-<i>E</i>-<i>p</i>-coumaroyl)-β-<scp>d</scp>-glucopyranoside, Efficient Glycosylation of Flavonol 3-OH with Glycosyl <i>o</i>-Alkynylbenzoates as Donors
作者:Weizhun Yang、Jiansong Sun、Wenxiang Lu、Yan Li、Lei Shan、Wei Han、Wei-Dong Zhang、Biao Yu
DOI:10.1021/jo1014189
日期:2010.10.15
linkage with a glycosyl bromide under conventional PTC conditions. In the second approach, 5,7,4′-tri-O-benzyl-kaempferol was readily prepared from 2′,4′,6′-trihydroxyacetophenone and p-hydroxybenzoic acid, which was coupled with a glucopyranosyl o-hexynylbenzoate under the catalysis of a gold(I) complex to provide the desired 3-O-glycoside in excellent yield. A variety of the glycosyl o-hexanylbenzoates
Kaempferol 3- O-(3',6''- di - O - E - p-香豆酰基)-β- d-吡喃葡萄糖苷(1),一种苏格兰松树幼苗的最佳代谢产物,可保护深层组织免受伤害。 UV-B代表典型的酰化黄酮醇3- O-糖苷。该化合物是通过两种方法首次合成的。第一种方法从山ka酚开始,其特征在于在常规PTC条件下与糖基溴化物形成黄酮醇3- O-糖苷键。在第二种方法中,可以很容易地从2',4',6'-三羟基苯乙酮和p制备5,7,4'-三-O-苄基-山emp酚-羟基苯甲酸在金(I)络合物的催化下与葡糖吡喃糖基邻己炔基苯甲酸酯偶联,以优异的产率提供所需的3- O-糖苷。还证实了多种配备有2- O-苯甲酰基的糖基邻-己基苯甲酸酯是构建黄酮醇3- O-糖苷键的高效供体。