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New pregnane glycosides from Cynanchum ascyrifolium
Hosup Yeo1, Young Hae Choi, Jinwoong Kim
1College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Korea.
Chemical & Pharmaceutical Bulletin
|June 5, 2002
Abstract:
Two new pregnane glycosides, cynascyrosides D and E, were isolated from the roots of Cynanchum ascyrifolium. The structures of these compounds were determined on the basis of spectroscopic and chemical evidence as cynajapogenin A 3-O-alpha-L-cymaropyranosyl-(1-->4)-beta-D-digitoxopyranosyl-(1-->4)-beta-L-cymaropyranoside and cynajapogenin A 3-O-beta-D-glucopyranosyl-(1-->4)-alpha-L-diginopyranosyl-(1-->4)-beta-L-cymaropyranosyl-(1-->4)-beta-D-digitoxopyranoside.