Tannins and Related Polyphenols of Euphorbiaceous Plants. IX. Hydrolyzable Tannins with ^1C_4 Glucose Core form Phyllanthus flexuosus MUELL. ARG.

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Four new hydrolyzable tannins (phyllanthusiins A-D), a new polyphenol of related structure (phyllanthusiin E), and eight known polyphenols have been isolated from the leaves of Phyllanthus flexuosus. On the basis of the spectroscopic methods including ^1H-^<13>C long-range two-dimensional nuclear magnetic resonance techniques, phyllanthusiins A (9), B (12) and C(14), were characterized as oxidative metabolites of geraniin, each having a different new acyl group biogenetically formed via an oxidative cleavage of the dehydrohexahydroxydiphenoyl group, on the ^1C_4 glucopyranose core. Phyllanthusiin D (15) was determined to be a condensate of geraniin with acetone, and phyllanthusiin E (16), was an oxidized congener of ellagic acid.
社団法人日本薬学会の論文
1992-01-25