Effects of O-Methylation and O-Glucosylation on Carbon-13 Nuclear Magnetic Resonance Chemical Shifts of Matairesinol, (+)-Pinoresinol and (+)-Epipinoresinol

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The effects of O-methylation and O-glucosylation on the carbon-13 nuclear magnetic resonance chemical shifts of matairesinol (1), (+)-pinoresinol (6) and (+)-epipinoresinol (11) are discussed. The chemical shifts of carbons on the 2,3-dibenzylated butyrolactone and 2,6-diarylated 3,7-dioxabicyclo [3. 3. 0] octane rings are not affected by methylation and glucosylation of hydroxy groups on the aromatic rings. As regards the chemical shifts of aromatic carbons caused by O-methylation, all the 1'(1"), 3'(3"), and 4'(4") carbons of the guaiacyl unit are characteristically shifted downfield by 1.6±0.1,1.3±0.1,and 2.4±0.1 ppm, respectively, while the 5'(5") carbons are shifted upfield by 3.5±0.1 ppm. In the case of the chemical shifts of aromatic carbons caused by O-glucosylation, all the 1'(1") and 3'(3") carbons of the guaiacyl unit are characteristically shifted downfield by 3.0±0.1 and 1.3±0.1 ppm, respectively.
公益社団法人日本薬学会の論文
1984-11-25