Highly chemo- and stereoselective glycosidation of permethacrylated O-glycosyl trichloroacetimidate reagents promoted by TMSNTf2
作者:Christelle Zandanel、Laure Dehuyser、Alain Wagner、Rachid Baati
DOI:10.1016/j.tet.2010.02.068
日期:2010.5
TMSNTf2 has been used efficiently as a promoter in glycosidation reaction involving permethacrylated Schmidt reagents. While TMSNTf2 is known to be a powerful activator for CO double bonds, we have discovered that this reagent can activate CN double bond selectively, even in the presence of excess CO groups of permethacrylated O-glycosyl trichloroacetimidate substrates. Glycosides are synthesized in
TMSNTf 2已有效地用作涉及过甲基丙烯酸酯化Schmidt试剂的糖苷化反应的促进剂。尽管已知TMSNTf 2是C O双键的强大活化剂,但我们发现,即使存在过甲基丙烯酸O-糖基三氯乙酰亚氨酸酯底物的过量C O基,该试剂也可以选择性活化C N双键。糖苷以中等至合理的产率合成,具有出色的整体β-立体选择性。