Structures of Dioscin, Gracillin, and Kikuba-saponin.(2).(Saponins of Japanese Dioscoreaceae. XI.)

Abstract

Three steroid saponins from japanese Dioscoreaceae plants, dioscin, gracillin and kikuba-saponin were proved to have branched-chain oligosaccharide moieties, and assigned structures, diosgenin bis-α-L-rhamnopyranosyl (1→2 and 1→4)-β-D-glucopyranoside (IV), diosgenin -L-rhamnopyranosyl (1→2_G1c.¹)-β-D-glucopyranosyl (1→3_G1c.1)-β-Dglucopyranoside (V) and diosgenin β-D-glucopyranosyl (1→X_G1c.2)-β-D-glucopyranosyl (1→_3G1c.¹)-α-L-rhamnopyranosyl (1→2_G1c.¹)-β-D-glucopyranoside (VI), respectively.