[Structure of chrysantellin B, a new saponin isolated from Chrysanthellum procumbens Rich (author's transl)]

Abstract

International audienceA new saponin, chrysantellin B, has been found in a tropical plant Chrysanthellum procumbens Rich as a minor companion of chrysantellin A which was previously studied. The structure of chrysantellin B was determined by mass spectrometry, proton and 13C nuclear-magnetic resonance. The aglycone part is a triterpene: 3 beta, 16 alpha, 23-trihydroxy-olean-12-en-28-oic acid or caulophyllogenin. Carbohydrate components are D-glucose, D-oxylose and L-rhamnose in a molar ratio 1:2:2. The structure of chrysantellin B was established as 3-O-beta-D-glucopyranosyl[L-rhamnopyranosyl-(alpha 1 leads to 3)-D-xylopyranosyl-(beta 1 leads to 4)-L-rhamnopyranosyl-(alpha 1 leads to 2)-D-xylopyranosyl-(beta 1 leads to 28)]caulophyllogenin.A new saponin, chrysantellin B, has been found in a tropical plant Chrysanthellum procumbens Rich as a minor companion of chrysantellin A which was previously studied. The structure of chrysantellin B was determined by mass spectrometry, proton and 13C nuclear-magnetic resonance. The aglycone part is a triterpene: 3 beta, 16 alpha, 23-trihydroxy-olean-12-en-28-oic acid or caulophyllogenin. Carbohydrate components are D-glucose, D-oxylose and L-rhamnose in a molar ratio 1:2:2. The structure of chrysantellin B was established as 3-O-beta-D-glucopyranosyl[L-rhamnopyranosyl-(alpha 1 leads to 3)-D-xylopyranosyl-(beta 1 leads to 4)-L-rhamnopyranosyl-(alpha 1 leads to 2)-D-xylopyranosyl-(beta 1 leads to 28)]caulophyllogenin