Under pre-activation glycosylation conditions, the 4,6-di-O-acetyl-N-acetyloxazolidinone protected donor afforded either excellent β- or α-stereoselectivity simply by means of the addition of hindered base TTBP or the absence of base, leading to the controllable stereochemistry of coupling reactions.
在预活化糖基化条件下,4,6-二-O-乙酰基-N-乙酰基
噁唑烷酮保护的供体通过添加障碍基碱
TTBP或不添加碱,获得了优异的β-或α-立体选择性,从而实现了偶联反应的可控立体
化学。