Exploring the Native Chemical Ligation Concept for Highly Stereospecific Glycosylation Reactions
摘要:
Various O-alkyl glycosides were obtained in a highly stereospecific manner with retention of configuration at the anomeric center. Our method has customized native chemical ligation concept for glycoconjugates synthesis, utilizing a meticulously controlled activating system. To explain the origin of stereoselective preference, an S(N)i mechanism was proposed and corroborated by computational calculations.
Synthetic applications of Ramberg-Bäcklund derived exo-glycals
作者:Marie-Lyne Alcaraz、Frank K. Griffin、Duncan E. Paterson、Richard J.K. Taylor
DOI:10.1016/s0040-4039(98)01823-1
日期:1998.10
title glycals, prepared from S-glycoside dioxides using the Meyers' variant of the Ramberg-Bäcklund rearrangement are described. These include a formal total synthesis of a novel β-glycosidase inhibitor, and an efficient route to spirocyclic glucose derivatives. In addition, silyl methodology has been developed which allows unprotected exo-glycals to be synthesised.