Three new steroidal saponins from Fritillaria pallidiflora

摘要

Three new steroidal saponins, pallidiflosides A (1), B (2), and C (3), have been isolated from the dry bulbs of Fritillaria pallidiflora Schrenk. Their structures were elucidated as 26-O-beta-D-glucopyranosyl-(25R)-furost-5,20(22)-dien-3beta,26-diol-3-O-beta-D-xylopyranosyl(l -> 4)-[alpha-L-rhamnopyranosyl(l -> 2)]-p-D-glucopyranoside (1); 26-O-beta-D-glucopyranosyl-3beta,26-dihydroxyl-20,22-seco-25(i?)-furost-5-en-20,22-dione-3-O-alpha-L-rhamnopyranosyl(l-> 2)-beta-D-glucopyranoside (2); and (25R)-spirost-5-ene-3beta,17alpha-diol-3-O-(3-D-glucopyranosyl(l -> 4)-P-D-galactopyranoside (3) by spectroscopic techniques and chemical means.