Photolabile 2-(2-Nitrophenyl)-propyloxycarbonyl (NPPOC) for Stereoselective Glycosylation and Its Application in Consecutive Assembly of Oligosaccharides
作者:Jincai Wang、Yingle Feng、Taotao Sun、Qi Zhang、Yonghai Chai
DOI:10.1021/acs.joc.1c03006
日期:2022.3.4
A photolabile protecting group (PPG) 2-(2-nitrophenyl)-propyloxycarbonyl (NPPOC) was explored in glycosylation and applied in the consecutive synthesis of oligosaccharides. NPPOC displays a strong neighboring group participation (NGP) effect to facilitate the construction of 1,2-trans glycosides in excellent yield. Notably, NPPOC could be efficiently removed by photolysis, and the deprotection conditions
探索了一种光不稳定的保护基团(PPG)2-(2-硝基苯基)-丙氧羰基(NPPOC)在糖基化中的应用,并将其应用于寡糖的连续合成中。NPPOC 显示出强大的邻组参与 (NGP) 效应,以促进 1,2-反式糖苷的高产率构建。值得注意的是,NPPOC可以通过光解有效去除,脱保护条件对典型保护基团友好。快速制备了支链不对称寡甘露糖Man6,并进一步研究了由于NPPPOC光解和糖基化之间的相容性条件而无需中间纯化的寡糖的连续组装。