O-Galloyl-C-glycosylflavones from Pelargonium reniforme

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• 作者：Latté ; Klaus Peter ; Ferreira ; Daneel ; Venkatraman ; M.S. ; Kolodziej ; Herbert
• 关键词：Pelargonium reniforme ; Geraniaceae ; C-Glycosylflavones ; 2&Prime ; -O-Galloylvitexin ; 2&Prime ; -O-Galloylorientin ; 2&Prime ; -O-Galloylisovitexin ; 2&Prime ; -O-Galloylisoorientin ; Flavonoids
• 刊名：Phytochemistry
• 出版年：2002
• 出版时间：February, 2002
• 年：2002
• 卷：59
• 期：4
• 页码：419-424
• 全文大小：199 K

文摘

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.