Studies on the Constituents of Calliandra anomala (kunth) macbr. I. Structure Elucidation of Two Acylated Triterpenoidal Saponins

Abstract

Two novel triterpenoidal saponins, called calliandra saponins A and E, were isolated from the branches of Calliandra anomala (kunth) macbr. On the basis of the chemical and physicochemical evidence, their structures were de-fined as 3-Oα-L-arabinopyranosyl-(1→2)-α-L-arabinopyranosyl-(1→6)-2-acetamido-2-deoxy-β-D-glucopyranosyl echinocystic acid 28-O-{β-D-glucopyranosyl-(1→3)-[β-D-xylopyranosyl-(1→3)-β-D-xyIopyranosyl-(1→4)]-α-L-rhamnopy-ranosyl-(1→2)-[(6S)-2-trans-2,6-dimethyl-6-O-β-D-xylopyranosyl-2,7-octadienoyl-(1→6)]-β-D-glucopyranosyl} ester (4) and 3-O-α-L-arabinopyranosyI-(1→2)-α-L-arabinopyranosyI-(1→6)-2-acetamido-2-deoxy-β-D-gIucopyranosyI echinocystic acid 28-O-{β-D-glucopyranosyl-(1→3)-[β-D-xylopyranosyl-(1→3)-β-D-xylopyranosyl-(1→4)]-α-L-rhamnopy-ranosyl-(1→2)-[(6’S’)-2’-trans-2,,6’-dimethyl-6’-O-(2-O-(6S)-2-trans-2,6-dimethyl-6-hydroxy-2,7-octadienoyl)-β- D-xylopyranosyI-2’,7’-octadienoyl-(1→6)]-β-D-glucopyranosyl} ester (5), respectively. © 1993, The Pharmaceutical Society of Japan. All rights reserved.