The assistance of neighboring protecting groups with different orientations in 1,2-diol acceptors and the reactivity of both reaction partners, the donor and the acceptor, have been evaluated as factors that determine the regioselectivity of glycosylation reactions. It has been established, by experimental and theoretical studies, that the regioselectivity for the glycosylation of a given OH group can be considerably increased by the presence of groups able to form a hydrogen bond with that OH group. Moreover higher regioselectivities are observed when armed donor/activated acceptor combinations are avoided.
1,2
-二醇受体中具有不同方向的相邻保护基团的协助以及反应伙伴(供体和受体)的反应性已被评估为决定糖基化反应的区域选择性的因素。通过实验和理论研究已经确定,给定OH基团的糖基化的区域选择性可以通过能够与该OH基团形成氢键的基团的存在而显着增加。此外,当避免武装供体/活化受体组合时,观察到更高的区域选择性。