Flavonol Glycosides from Leaves of Bergenia himalaica

摘要

A new flavonol triglycosides,quercetin 3-O-alpha-L-rhamno-pyranosyl(1->2)-beta-D-galactopyranosyl(l->6)-beta-D-glucopyrano-side(1)was isolated from the leaves of Bergenia himalaica together with three known flavonol diglycosides:kaempferol-3-O-alpha-L-rhamnopyranosyl-7-O-alpha-L-arabinopyranoside(2),quercetin-3-O-beta-D-xylopyranosyl(1->6)-beta-D-glucopyranoside(3),quercetin-3-O-alpha-L-arabinopyranosyl(l->2)-beta-D-glucopyranoside(4)and five known flavonol monoglycosides:kaempferol-7-O-alpha-L-rhamno-pyranoside(5),kaempferol-7-O-beta-D-allopyranoside(6),quescetin-3-O-beta-D-xylopyranoside(7),quercetin-3-O-beta-D-gluco-pyranoside(8)and quercetin-3-O-alpha-L-rhamnopyranoside(9).Their structures were determined on the basis of Rf values,acid hydrolysis,UV-Visible EIMS,FAB~+MS,~1H and ~(13)CNMR spectral data.