Chemical and Chemotaxonomical Studies of Ferns. LXXIII. New Flavonoids with Modified B-Ring from the Genus Pseudophegopteris(Thelypteridaceae)(Organic,Chemical)

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Chemical studies of three representatives of the genus Pseudophegopteris (Thelypteridaceae) revealed that the genus is characterized by the occurrence of unusual flavonoids with a modified. Bring related to protogenkwanin(VII). From P. hirtirachis HOLTT., three novel compounds, protogenkwanone(I), tetrahydroprotogenkwanone(II) and tetrahydroprotogenkwanin(III), were isolated, along with protogenkwanin 4'-O-β-D-glucoside(VI). From P. subaurita CHING, two new acylated glucosides of protogenkwanin, protogenkwanin 4'-O-(2-O-acetyl)-β-D-glucoside(IV) and 4'-O-(6-O-acetyl)-β-D-glucoside(V), were obtained, together with I, II and VI. From P. bukoensis HOLTT., IV, V and VI were isolated, in addition to apigenin 7-O-α-L-rhamnoside and kaempferol. The structures of the new compounds were determined by means of spectroscopic methods and chemical transformations.
社団法人日本薬学会の論文
1987-12-25