Selection of Neighboring Group Participation Intermediates of Fully Acylated Donors around the Glycosylation Sites in Oligosaccharide Acceptors
作者:Sang-Hyun Son、Youngjoo Byun、Nobuo Sakairi
DOI:10.1021/acs.orglett.9b03601
日期:2019.12.6
generally involves neighboring group participation, which is less successful when synthesizing β-1,3-linked oligosaccharides. The combined steric effect of a 2-O-substituent and an aglycon moiety in acceptors increases the efficiency of glycosylation via neighboring group participation. This steric effect was reduced by using vicinal polyol acceptors and was demonstrated in the synthesis of 1,3-linked branched
在寡糖合成中,糖苷键的立体选择性和区域选择性形成是一个具有挑战性的话题。1,2-反式-糖苷的立体选择性构建通常涉及邻近基团的参与,这在合成β-1,3-连接的寡糖时不太成功。受体中2- O-取代基和糖苷配基部分的组合空间效应通过相邻基团的参与提高了糖基化的效率。通过使用邻位多元醇受体降低了这种空间效应,并在合成1,3-连接的支链低聚糖中得到了证明。