The isolation and characterization of three novel triterpene glycosides 1-3 from the medicinal plant Ardisia japonica (Myrsinaceae) are described. The compounds are characterized by a branched oligosaccharide chain, composed of four sugar units. The oligosaccharide structures were determined by H-1-H-1 correlation spectroscopy (COSY, HOHAHA, ROESY) and H-1-C-13 heteronuclear correlation (HETCOR) nmr experiments. The aglycone moieties are the oleane-type triterpenes cyclamiretin A for 1 and the new 13,28-epoxy-30,30-dimethoxyolean-3beta,16alpha-diol and 3beta,16alpha-dihydroxy-13,28-epoxyolean-29-oic acid for 2 and 3, respectively.
Characterization of three new triterpenoid saponins from Ardisia japonica
DE TOMMASI, Nunziatina;PIACENTE, Sonia;PIZZA, Cosimo;
1993-01-01
Abstract
The isolation and characterization of three novel triterpene glycosides 1-3 from the medicinal plant Ardisia japonica (Myrsinaceae) are described. The compounds are characterized by a branched oligosaccharide chain, composed of four sugar units. The oligosaccharide structures were determined by H-1-H-1 correlation spectroscopy (COSY, HOHAHA, ROESY) and H-1-C-13 heteronuclear correlation (HETCOR) nmr experiments. The aglycone moieties are the oleane-type triterpenes cyclamiretin A for 1 and the new 13,28-epoxy-30,30-dimethoxyolean-3beta,16alpha-diol and 3beta,16alpha-dihydroxy-13,28-epoxyolean-29-oic acid for 2 and 3, respectively.File in questo prodotto:
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