Abstract
Abstract The positional isomers of triglucopyranosyl-cyclomaltoheptaose (β-cyclodextrin, βCD) were chemically synthesized by glucosylations of tris(2, 3-di-O-acetyl)-tetrakis(2, 3, 6-tri-O-acetyl)-βCDs with 2, 3, 4, 6-tetra-O-benzyl-1-O-trichloroacetoimidoyl-α-D-glucopyranose in the presence of trifluoromethanesulfonic acid in dichloromethane, followed by debenzylation and deacetylation. The desired 61, 6X, 6Y-tri-O-(α-D-glucopyranosyl)-βCDs were isolated from each reaction mixture containing their configurational isomers by HPLC and characterized by 13C NMR spectroscopy.
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