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
The Influence of Neighboring Group Participation on the Hydrolysis of 2-O-Substituted Methyl Glucopyranosides
作者:Mads Heuckendorff、Christian M. Pedersen、Mikael Bols
DOI:10.1021/ol202308y
日期:2011.11.18
group participation actually enhance the reactivity of the anomeric center when the participating group is inherently disarming? To investigate the influence of the neighboring group effect from a 2-O protective group on acidic glycoside hydrolysis, 10 methyl glucosides having different protective groups on O2 have been synthesized and a clear trend between anomeric configuration, participation of the