Studies on the Constituents of Leguminous Plants. VIII. The Structure of a New Triterpenoid Saponin from the Fruits of Gymnocladus chinensis BAILLON

Abstract

A new triterpene saponin, gymnocladus saponin D (5), having a glycosyl monoterpene carboxylate and a monoterpene carboxylate group, was isolated and its structure was characterized as the (6S)-2-trans-2, 6-dimethyl-6-hydroxy-2, 7-octadienoate of 2β, 23-dihydroxy-3-O-α-L-rhamno-pyranosyl-21-O-[(6S)-2-trans-2, 6-dimethyl-6-α-L-arabinopyranosyloxy-2, 7-octadienoyl]-acacic acid 28-O-β-D-xylopyranosyl-(1→3)-β-D-xylopyranosyl-(1→2)-[L-rhamnopyranosyl-(1→6)]-β-D-glucopyranosyl-(1→2)-β-D-glucopyranoside, on the basis of chemical and physicochemical evidence.