A Mild Glycosylation Protocol with Glycosyl 1‐Methylimidazole‐2‐carboxylates as Donors

Abstract A mild glycosylation protocol is developed by using glycosyl 1‐methylimidazole‐2‐carboxylates. Such a glycosylation can be promoted by a series of metal triflates and triflimides, especially Cu(OTf)2. The reaction is initiated by activation of the glycosyl ester donor via coordination with the metal cation assisted by the adjacent 1‐methylimidazole chelating group.