New flavonol tetraglycosides from Astragalus caprinus.
A new flavonol tetraglycoside, together with four acylated derivatives, were isolated from the leaves of Astragalus caprinus. Their structures were elucidated by spectroscopic methods, mainly 2D NMR, as kaempferol-3-O-[[beta-D-xylopyranosyl(1-->3)-alpha-L-rhamnopyranosyl(1-->6)][alpha-L-rhamnopyranosyl(1-->2)]]-beta-D-galactopyranoside (1), its 3(Gal)-p-coumaric (2) and 3(Gal)-ferulic (3) esters, and its 4(Gal)-p-coumaric (4) and 4(Gal)-ferulic (5) esters.
Semmar
Nabil
N
Laboratoire de Phytochimie et Biologie Micromoleculaire, UFR de Biologie, Université Lyon 1, France.
Fenet
Bernard
B
Gluchoff-Fiasson
Katia
K
Comte
Gilles
G
Jay
Maurice
M
D002240:Carbohydrate Sequence; D007887:Fabaceae / Q000737:chemistry*; D005419:Flavonoids / Q000032:analysis*; D044949:Kaempferols; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D018515:Plant Leaves / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization
D005419:Flavonoids; D044949:Kaempferols; C470117:kaempferol-3-O-((xylopyranosyl(1-3)-rhamnopyranosyl(1-6))(rhamnopyranosyl(1-2)))galactopyranoside; C006552:kaempferol