On the Constituents of Nauclea orientalis L. I. Noreugenin and Naucleoside, A New Glycoside. : Terpenoids V

抄録

β-Sitosterol, noreugenin (I), palmitic acid, and naucleoside (VII), a new triterpene glycoside, have been isolated from Nauclea orientalis L. The direct isolation of 2-methyl-5, 7-dihydroxychromone (noreugenin)(I) from natural source has never been published, although it has been synthesized and also derived from eugenin (II) by demethylation. Upon acidic hydrolysis, naucleoside gave quinovaic acid (III) as the aglycon, together with D-xylose and L-rhamnose as the sugar moiety. The order of linkage is shown to be represented by D-xylose-L-rhamnose-(C-3)-quinovaic acid (VII).