Tannins and Related Compounds. XLVII. : Rhubarb. (6). Isolation and Characterization of New p-Hydroxyphenylbutanones, Stilbenes and Gallic Acid Glucosides

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Along with the previously reported phenylbutanone glucosides, i.e., lindleyin (7), isolindleyin (8) and 4-(4'-hydroxyphenyl)-2-butanone 4'-O-β-D-glucopyranoside (9), three new related compounds (1,2 and 3) have been isolated from a rhubarb of high quality (commercial name : 長吉黄). The structures of 1-3 were established on the basis of chemical and spectroscopic data to be 4-(4'-hydroxyphenyl)-2-butanone 4'-O-β-D-(2", 6"-di-O-galloyl)-glucopyranoside (1), 4-(4'-hydroxyphenyl)-2-butanone 4'-O-β-D-(2"-O-galloy-6"-O-cinnamoyl)-glucopyranoside (2) and 4-(4'-hydroxyphenyl)-2-butanone 4'-O-β-D-(2"-O-galloyl-6"-O-p-coumaroyl)gluocopyranoside (3). In addition, 3,4', 5-trihydroxystilbene 4'-O-β-D-(2"-O-galloyl)-glucopyranoside (4), gallic acid 3-O-β-D-glucopyranoside (5) and gallic acid 4-O-β-D-glucopyranoside (6) have been newly isolated.
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1986-08-25