A New Flavone Glucoside, Apigenin 7-o-glucoside 4'-acetate And A New Fern Constituent, Quercetin 3-o-rhamnoside-7-o-glucoside From Dryopteris Villarii

摘要

Ten flavonol O-glycosides (based on kaempferol and quercetin), two flavanone O-glycosides (based on naringenin and eriodictyol) and three C-glycosylflavones (vitexin, vitexin 7-O-glucoside and orientin) have previously been identified by Hiraoka (Biochem. Syst. Ecol. 6:171-175. 1978) in eighteen Dryopteris species whereas 3-desoxyanthocyanins have been found in red sori of Dryopteris erythrosora (Eat.) Kuntze by Harborne (Phytochemistry 5: 589-600. 1966). In addition kaempferol 7-O-(6"-succinyl-glucoside) was found in four Dryopteris species and an unusual flavan was isolated from Dryopteris filix-mas (L.) Schott as shown in a review by Markham (pp. 427-468, in J.B. Harborne ed., The Flavonoids, Advances in Research since 1980, Chapman and Hall, London and New York. 1988). Twenty-one flavonoids (15 flavonol glycosides, three flavone glycosides and three aglycones) have been found recently in Dryopteris villarii by Imperato (Amer. Fern J. 96: 93-96. 2006; Amer. Fern J. 97(2): 124-126. 2007; Nat. Prod. Commun. 2: 909-912. 2007).