PREPARATION OF BENZOYL-2,6-DIDEOXY-3-O-METHYL-BETA-D-ALLOPYRANOSE ANDITS DISACCHARIDE DERIVATIVE

4-O-benzoyl-2,6-dideoxy-3-O-methyl-D-allopyranose, needed as one of th e building blocks for construction of a novel cyclodextrin-like compou nd, was prepared in the form of crystalline beta-anomer 6 from methyl o-4,6-O-benzylidene-2-deoxy-alpha-D-allopyranoside 1. As a model of al pha-glycosidation necessary for formation of a cyclic structure, 6 was converted into the corresponding beta-glycosyl trichloroacetimidate a nd coupled with methyl 6-O-benzyl-2,3-di-O-methyl-alpha-D-glucopyranos ide 8, giving alpha(1-->4)-linked disaccharide derivative 9.