title: O-Galloyl-C-glycosylflavones from Pelargonium reniforme.
abstract: The unique series of C-2''-acylated C-glycosylflavones is extended by the discovery of the C-8-glucosyl derivatives 2''-O-galloylvitexin and 2''-O-galloylorientin and their C-6 analogues 2''-O-galloylisovitexin and 2''-O-galloylisoorientin, representing the first described O-galloyl-C-glycosylflavones. They are accompanied in the aerial parts of Pelargonium reniforme by the known non-galloylated parent analogues vitexin, orientin, isovitexin and isoorientin, as well as several known flavonoid-O-glycosides. The structures of these compounds were established from spectroscopic studies. Differentiation between C-glycosylation at C-6 and C-8 is discussed on the basis of the effects of dynamic rotational isomerism.
authors.affiliation: Institut für Pharmazie, Pharmazeutische Biologie, Freie Universität Berlin, Konigin-Luise-Str. 2+4, Berlin 14195, Germany.
authors.forename: Klaus Peter
authors.initials: KP
authors.lastname: Latté
authors.forename: Daneel
authors.initials: D
authors.lastname: Ferreira
authors.forename: M S
authors.initials: MS
authors.lastname: Venkatraman
authors.forename: Herbert
authors.initials: H
authors.lastname: Kolodziej
mesh_terms: D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D019684:Magnoliopsida / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D005419:Flavonoids