Described herein is the first example of glycosidation of thioglycosides in the presence of palladium(II) bromide. While the activation with PdBr2 alone was proven feasible, higher yields and cleaner reactions were achieved when these glycosylations were performed in the presence of propargyl bromide as an additive. Preliminary mechanistic studies suggest that propargyl bromide assists the reaction
本文描述的是在
溴化钯( II )存在下
硫代糖苷的糖苷化的第一个实例。虽然单独使用 PdBr 2进行活化已被证明是可行的,但当这些糖基化在炔丙基
溴作为
添加剂存在的情况下进行时,可以实现更高的产率和更清洁的反应。初步机理研究表明,炔丙基
溴通过产生电离络合物来促进反应,从而加速离去基团的离开。研究了与不同糖基受体反应的各种
硫代糖苷供体,以确定这种新反应的初始范围。还探索了
硫代糖苷相对于其他离去基团的选择性和
化学选择性激活。