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Four new flavonol glycosides from the leaves of Astragalus caprinus
Nabil Semmar1, Bernard Fenet, Katia Gluchoff-Fiasson
1Laboratoire de Phytochimie et Biologie Micromoleculaire and Centre de RMN, UCB-ESCPE, UPRESA CNRS 5012, Université Claude Bernard, 43 Bd. 11 Novembre, 69622 Villeurbanne, France. Nabilsemmar@hotmail.com
Abstract:
Four new flavonol 3-O-glycosides were isolated from the leaves of Astragalus caprinus. Their structures were elucidated by spectroscopic methods as rhamnocitrin-3-O-[3-hydroxy-3-methylglutaroyl(1-->6)][beta-D-apiofuranosyl(1-->2)]-beta-D-galactopyranoside (1), rhamnetin-3-O-[3-hydroxy-3-methylglutaroyl(1-->6)][beta-D-apiofuranosyl(1-->2)]-beta-D-galactopyranoside (2), kaempferol-3-O-[beta-D-xylopyranosyl(1-->3)-alpha-L-rhamnopyranosyl(1-->6)]-beta-D-galactopyranoside (3), and quercetin-3-O-[beta-D-xylopyranosyl(1-->3)-alpha-L-rhamnopyranosyl(1-->6)][beta-D-apiofuranosyl(1-->2)]-beta-D-galactopyranoside (4).
