A Streamlined Regenerative Glycosylation Reaction: Direct, Acid‐Free Activation of Thioglycosides
作者:Samira Escopy、Yashapal Singh、Keith J. Stine、Alexei V. Demchenko
DOI:10.1002/chem.202003479
日期:2021.1.4
(HOFox) is able to mediate glycosylations via intermediacy of OFox imidates. Thioglycoside precursors were first converted into the corresponding glycosyl bromides that were then converted into the OFox imidates in the presence of Ag2O followed by the activation with catalytic Lewis acid in a regenerative fashion. Reported herein is a direct conversion of thioglycosides via the regenerative approach
我们的小组之前曾报道过,3,3-二
氟吲哚(HOFox)能够通过 OFox
亚胺酸
酯的中介来介导糖基化。
硫糖苷前体首先转化为相应的糖基
溴化物,然后在 Ag 2 O存在下转化为 OFox
亚胺酸
酯,然后以再生方式用催化
路易斯酸活化。本文报道了通过再生方法直接转化
硫糖苷,该方法绕过了
溴化物的中介并消除了对基于重
金属的
促进剂的需要。在中性反应条件下仅使用 1 当量即可实现
硫糖苷的直接再生活化。不含酸性
添加剂的 NIS 和催化 HOFox。