TWO TRITERPENOID SAPONINS FROM PTEROCEPHALUS BRETSCHNEIDRI

Article abstract of DOI:10.1016/0031-9422(93)85175-Q

Two new triterpenoid saponins, named bretschnosides A and B, were isolated from the roots of Pterocephalus bretschneidri.On the basis of chemical degradation and spectroscopic evidence, the structures of bretschnosides A and B were shown to be 3-O-α-L-rhamnopyranosyl(1->3)-β-D-xylopyranosyl(1->3)-α-L-rhamnopyranosyl(1->2)-β-D-xylopyranosyl oleanolic acid 28-O-β-D-glucopyranosyl(1->6)-β-D-glucopyranoside 4 and 3-O-α-D-glucopyranosyl(1->3)-β-D-xylopyranosyl(1->3)-α-L-rhamnopyranosyl(1->2)-β-D-xylopyranosyl oleanolic acid 28-O-β-D-glucopyranosyl(1->6)-β-D-glucopyranoside 6, respectively.Key Word Index: Pterocephalus bretschneidri; Dipsacaceae; roots; triterpenoid saponins; bretschnoside A and B.