Isolation and Structure Elucidation of a New Disaccharide, 6-Deoay-D-glucobiose, from Acid Hydrolyzate of Asterosaponin A

Abstract

Acid hydrolysis of asterosaponin A afforded a crystalline 6-deoxyglucobiose, whose structure has been established as O-(6-deoxy-α-D-glucopyranosyl)-(1→4)-6-deoxy-n-glucose. This is the first isolation of a 6-deoxyglucobiose. Its formation as _??_ hydrolytic fragment of asterosaponin A suggests the presence of an α-1→4'-glycosidic linkage between the two 6-deoxy-D-glucose units in the saponin.