Experimental and theoretical study of the O3/O4 regioselectivity of glycosylation reactions of glucopyranosyl acceptors
作者:Enrique A. Del Vigo、Carlos A. Stortz、Carla Marino
DOI:10.1016/j.tet.2020.131719
日期:2020.12
The knowledge of the regioselectivity between different hydroxyl groups of glycosyl acceptors is valuable in planning simple strategies for the synthesis of oligosaccharides, minimizing the use of protecting groups. With the aim of obtaining deeper knowledge on this subject, we analyzed the relative reactivity of the OH-3 and OH-4 groups of 2,6-di-O-protected methyl α- and β-glucopyranosides in glycosylation
Regioselective control in organotin-mediated multiple acylation of carbohydrates is presented. The acylation reagent could be efficiently used to direct the product formation. Reagent-dependent thermodynamic and kinetic control and dynamic assistance mechanisms are suggested, resulting in the efficient preparation of building blocks that normally require many steps with traditional synthesis.