New acylated triterpene glycosides from the roots of Polygala tenuifolia

Abstract

Two new and five known acylated triterpene glycosides were isolated from the MeOH extract of the roots of Polygala tenuifolia. Based on extensive spectroscopic analysis, including 2D NMR experiments, and the results of alkaline hydrolysis, the structures of the new compounds were assigned as 3β-[(β-D-glucopyranosyl)oxy]-2β,27-dihydroxyolean-12-ene-23, 28-dioic acid 28-O-β-D-apiofuranosyl-(1→3)-[β-D-galactopyranosyl- (1→4)-β-D-xylopyranosyl-(1→4)]-α-L-rhamnopyranosyl- (1→2)-3-O-(E)-3,4,5-trimethoxycinnamoyl-β-D-fucopyranosyl ester (1) and 3β-[(β-D-glucopyranosyl)oxy]-2β,27-dihydroxyolean-12-ene-23, 28-dioic acid 28-O-β-D-apiofuranosyl-(1→3)-[β-D-galactopyranosyl- (1→4)-β-D-xylopyranosyl-(1→4)]-α-L-rhamnopyranosyl- (1→2)-[α-L-rhamnopyranosyl-(1→3)]-4-O-(E)-3,4- dimethoxycinnamoyl-β-D-fucopyranosyl ester (2).