trehalose containing tetrasaccharides isolated from Mycobacterium smegmatis is reported for the first time, using regioselective opening of benzylidene acetals and stereoselective glycosylations as key steps. The 1,2-cis stereoselectivity in the glycosylation reactions was achieved using anchimeric assistance from a remote participating group, steric effects and solvent participation. The synthetic strategy
首次报道了从耻垢分枝杆菌分离的三种重要的含
海藻糖的四糖的全合成,其中使用亚苄基
乙缩醛的区域选择性开放和立体选择性糖基化为关键步骤。糖基化反应中的1,2-顺式立体选择性是使用来自远程参与小组的
邻氨基苯甲酸酯协助,空间效应和溶剂参与而实现的。合成策略也可用于组装来自结核分枝杆菌的结构相关的低聚糖。