A stereocontrolled synthesis of 2-deoxy-β-glycosides has been achieved by developing a salient 1,2-trans-glycosidation method with 2-deoxy-2-[(p-methoxyphenyl)thio]glycopyranosyl N,N,N′,N′-tetramethylphosphoroamidates as glycosyl donors followed by a reductive removal of the p-methoxyphenylthio group with Raney nickel. The p-methoxyphenylthio group equatorially disposed at C-2 has proven to be an excellent stereodirecting auxiliary.
通过开发一种显著的1,2-反式糖基化方法,使用2-脱氧-2-[(对
甲氧基苯基)
硫]
吡喃糖基N,N,N',N'-四
甲基膦酰胺作为糖基供体,随后用Raney
镍还原去除对
甲氧基苯硫基团,实现了2-脱氧-β-糖苷的立体控制合成。位于C-2位的对
甲氧基苯硫基团在赤道位置上被证明是一个极佳的立体导向辅助基团。