Flavonol glycosides from Phoebe poilanei Kosterm

Abstract

Six flavonol glycosides, kaempterol 3-O-[ β -D-xylopyranosyl-(l→6)-β-D-glucopyranoside] (1), kaempferol 3-O-β-D-glucopyranoside (2), kaempferol 3-O-[α-L-rhamnopyranosyl-(l→2)-β-D-glucopyranoside] (3), kaempferol 3-O-α-L- rhamnopyranosyl-(l→6)-β-D-glucopyranoside] (4), kacmplerol 3-O-[α-L-rhamnopyranosyl-(l→6) β-D-galactopyranoside] (5), and rhamnocitrin 3-O-α-L-rhamnopyranosyl-(l→6)-[α-L-rhamnopyranosyl-(1→2)]-β-D-galactopyranoside (oxytroflavoside G) (6) were isolated from the leaves of Phoebe poilanei Kosterm. Their Chemical structures were elucidated by analyses of their ESI-MS, NMR spectral data, and comparison with those reported in the literature. This is the first report of 13C-NMR data of compound 1.