Tannins and Related Compounds. XLVIII. : Rhubarb. (7). Isolation and Characterization of New Dimeric and Trimeric Procyanidins

概要

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Together with the known flavan-3-ols and procyanidins, a new procyanidin dimer (11) and several new trimers (14,15,16,20,22,24 and 26) have been isolated from high-quality rhubarb (長吉黄). On the basis of chemical and spectroscopic data, the structures of these compounds were characterized as procyanidin B-5 3,3'-di-O-gallate (11), procyanidin C-1 3', 3''-di-O-gallate (14), procyanidin C-1 3,3', 3''-tri-O-gallate (15), 3-O-galloylepicatechin-(4β→6)-3-O-galloylepicatechin-(4β→8)-3-O-galloylepicatechin (20), 3-O-galloylepicatechin-(4β→6)-3-O-galloylepicatechin-(4β→6)-3-O-galloylepicatechin (22), 3-O-galloylepicatechin-(4β→6)-3-O-galloylepicatechin-(4β→8)-catechin (26), 3-O-galloylepicatechin-(4β→8)-3-O-galloylepicatechin-(4β→8)-catechin (16) and 3-O-galloylepicatechin-(4β→8)-3-O-galloylepicatechin-(4β→6)-catechin (24).
公益社団法人日本薬学会の論文
1986-10-25