Isolation and Structure of New Flavonoids, Flavoyadorinin-A, Flavoyadorinin-B and Homo-flavoyadorinin-B, in the Leaves of Viscum album Linnaeus var. coloratum Ohwi Epiphyting to Pyrus communis Linnaeus

Abstract

The flavonoid constituents of the leaves of Viscum album Linnaeus var. coloratum Ohwi (Viscaceae) epiphyting to Pyrus communis Linnaeus were examined. Three kinds of new flavonoids named Flavoyadorinin-A (I), C₂₃H₂₄O₁₂, mp 245∼246°C, Flavoyadorinin-B (II), C₂₃H₂₄O₁₁·3H₂O, mp 203∼206°C, and Homo-flavoyadorinin-B (III), C₂₈H₃₂O₁₅·3H₂O, mp 208∼210°C (sint. at 130°C) were isolated from the leaves of this plant.

The structures of the Compound (I), (II), and (III) were showed to be 7,3′-di-O-methyl-quercetin-3-O-mono-d-glucoside (rhamnazin-3-O-mono-d-glucoside), 7,3′di-O-methyl-luteolin-4′-O-mono-d-glucoside, and 7,3′-di-O-methyl-luteolin-4′-O-d-glucoapioside, respectively.