Tannins and Related Compounds. XXIX. Seven New Methyl Derivatives of Flavan-3-ols and a 1,3-Diarylpropan-2-ol from Cinnamomum cassia, C. obtusifolium and Lindera umbellata var. membranacea

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Seven new methyl derivatives of flavan-3-ols (compounds 1-7) and one 1,3-diarylpropan-2-ol (compound 8) were isolated from three Lauraceous plants (1,and 3-7 from Cinnamomum cassia, 1,3 and 4 from Cinnamomum obtusifolium, and 1-4 and 8 from Lindera umbellata var. membranacea). Their structures were characterized mainly by proton nuclear magnetic resonance (^1H-NMR) examination combined with nuclear Overhauser effect (NOE) experiments as the 3'-O-methylate (1), 3', 4'-di-O-methylate (2), 5,3'-di-O-methylate (3) and 5,7,3'-tri-O-methylate (4) of (-)-epicatechin, the 4'-O-methylate (5), 7,4'-di-O-methylate (6) and 5,7,4'-tri-O-methylate (7) of (+)-catechin, and 1-(4', 6'-dihydroxy-2'-methoxyphenyl)-3-(4'-hydroxy-3"-methoxyphenyl)-propan-2-ol (8).
公益社団法人日本薬学会の論文
1985-06-25