Synthesis of Thio-Linked Disaccharides by 1→2 Intramolecular Thioglycosyl Migration: Oxacarbenium versus Episulfonium Ion Intermediates
作者:Blair D. Johnston、B. Mario Pinto
DOI:10.1021/jo000226k
日期:2000.7.1
2-thio-linked methyl sophorosides or methyl kojibiosides is described. The method involves the 1-->2-migration of the thioglucopyranosyl portion of the nonreducing disaccharide with inversion of configuration at C-2 of the mannopyranose ring and concomitant formation of the methyl glucopyranoside. The thioglucosyl migration does not occur when electron-withdrawing benzoate protecting groups are present