キンモクセイの葉から新アシル化配糖体Osmanthuside A, B, Cの単離とその構造

Abstract

Three new p-coumaroyl glycosides, named osmanthuside A (I), B (II) and C (III), were isolated from the leaves of Osmanthus fragrans LOUR. var. aurantiacus MAKINO. The structures of I, II and III were elucidated to be β-(p-hydroxyphenyl) ethyl 4-O-trans-p-coumaroyl-β-D-glucopyranoside, β-(p-hydroxyphenyl) ethyl O-α-L-rhamnopyranosyl-(1→3)-4-O-trans-p-coumaroyl-β-D-glucopyranoside and β-(p-hydroxyphenyl) ethyl 4-O-cis-p-coumaroyl-β-D-glucopyranoside on the basis of analyses of the nuclear magnetic resonance spectra and the circular dichroism spectra.