Synthesis of Ketodeoxysugars from Acylated Pyranosides Using Photoredox Catalysis and Hydrogen Atom Transfer
作者:Julia A. Turner、Nicholas Rosano、Daniel J. Gorelik、Mark S. Taylor
DOI:10.1021/acscatal.1c03050
日期:2021.9.3
The combined action of a photoredox catalyst, a hydrogen atom transfer mediator, and a hydrogen bond acceptor cocatalyst has been used to achieve the transformation of pyranoside-derived esters into ketodeoxysugars. The position of the acylgroup dictates the site of deoxygenation, enabling the preparation of 2-deoxy- and 4-deoxyketosugar derivatives. The products are useful precursors to rare sugar
have studied the acyl migration in different monosaccharides using five different acylgroups by a combination of experimental, kinetic and theoretical tools. The results show that the anomeric configuration in the monosaccharide has a major influence on the migration rate, together with the relative configurations of the other hydroxylgroups and the nature of the migrating acylgroup. Full mechanistic