Efficient intramolecular #beta#-mannosie formation using m-xylylene and isophthaloyl derivatives as rigid spacers

摘要

A series of mannosyl donors linked via position 2 to an m-xylylene or an isophthaloyl spacer which was connected to the positon 6 of a glucoside acceptoro afforded, via intramolecular glycosylation, the corresponding disaccharides with high #beta# anomeric ratio