C21 Steroidal Glycosides from Acidic Hydrolysate of Cynanchum otophyllum
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摘要:
Abstract:
Objective To investigate the structures of compounds in the rhizome of Cynanchum otophyllum (Asclepiadaceae), and to find new C21 steroidal glycosides. Methods The ethyl acetate extract from the rhizome was subjected to acidic hydrolysis and isolated by column chromatography; The structures of the purified compounds were determined by spectral methods. Literature search confirmed whether those compounds were of new structures. Results Three compounds were isolated and their structures were deacetylmetaplexigenin 3-O-β-D-oleandropyranosyl-(1→4)-α-D-oleandropyranosyl- (1→4)-α-D-oleandropyranoside (1), deacetylmetaplexigenin 3-O-α-D-oleandropyranosyl- (1→4)-β-D-thevetopyranosyl-(1→4)-α-D-oleandropyranoside (2), and deacetylmeta- plexigenin 3-O-β-D-cymaropyranosyl-(1→4)-α-D-oleandropyranoside (3), respectively. Conclusion Compounds 1?3 are new compounds.
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National Natural Science Foundation of China (30572322); Natural Science Foundation of Yunnan Province (2005C0036Q)
