Flavonol Glycosides from Leaves of Bergenia himalaica

Abstract

A new flavonol triglycosides, quercetin 3-O-a-L-rhamnopyranosyl (1®2)-b-D-galcatopyranosyl (1®6)-b-D-glucopyranoside (1) was isolated from the leaves of Bergenia himalaica together with three known flavonol diglycosides: kaempferol-3-O-a-L-rhamnopyranosyl-7-O-a-L-arabinopyranoside (2), quercetin-3-O-b-D-xylopyranosyl (1®6)-b-D-glucopyranoside (3), quercetin-3-O-a-L-arabinopyranosyl (1®2)-b-D-glucopyranoside (4) and five known flavonol monoglycosides: kaempferol-7-O-a-L-rhamnopyranoside (5), kaempferol-7-O-b-D-allopyransoide (6), quercetin-3-O-b-D-xylopyranoside (7), quercetin-3-O-b-D-gluco-pyranoside (8) and quercetin-3-O-a-L-rhmnopyranoside (9). Their structures were determined on the basis of R_f values, acid hydrolysis, UV-Visible EIMS, FAB⁺ MS, ¹H and ¹³CNMR spectral data.