Stereocontrolled glycosylation is described by using a molecular clamp, which binds a glycosyl donor to an acceptor and controls their spatial arrangement. An α(1 → 4) glycosidic linkage was formed in a good yield with high selectivity by the use of phthaloyl bridge bound to both 6-positions of a glycosyl donor and an acceptor. β-Selective glycosylation was effected by the use of a silyl bridge attached to the same 6-positions of the same glycosyl donor and acceptor. Application of this method to the synthesis of a maltotetraose derivative is also described.
通过使用分子钳描述了立体控制糖基化,分子钳将糖基供体与受体结合在一起,并控制它们的空间排列。通过使用与糖基供体和受体的两个 6 位结合的邻苯二甲酰桥,以高产率和高选择性形成了δ(1 → 4)糖苷键。δ-选择性糖基化是通过使用连接到同一糖基供体和受体的相同 6 位的
硅桥来实现的。此外,还介绍了这种方法在合成
麦芽四糖衍
生物中的应用。