Reagent‐Controlled α‐Selective Dehydrative Glycosylation of 2,6‐Dideoxy‐ and 2,3,6‐Trideoxy Sugars
作者:Jason M. Nogueira、Marissa Bylsma、Danielle K. Bright、Clay S. Bennett
DOI:10.1002/anie.201605091
日期:2016.8.16
that activating either 2,3‐bis(2,3,4‐trimethoxyphenyl)cyclopropenone or 2,3‐bis(2,3,4‐trimethoxyphenyl)cyclopropene‐1‐thione with oxalyl bromide results in the formation of a species that promotes the glycosylation between 2,6‐dideoxy‐sugar hemiacetals and glycosyl acceptors in good yield and high α‐selectivity. Both reactions are mild and tolerate a number of sensitive functional groups including highly
我们发现用草酰溴活化2,3-双(2,3,4-三甲氧基苯基)环丙烯酮或2,3-双(2,3,4-三甲氧基苯基)环丙烯-1-硫酮会导致草酰溴的形成能够以高收率和高α-选择性促进2,6-二脱氧糖半缩醛和糖基受体之间的糖基化的物种。这两个反应都是温和的,并且可以耐受许多敏感的官能团,包括高度酸不稳定的2,3,6-三甲氧基-糖键。