摘要
Two new steroidal glycosides named cyanoauriculoside A （1） and B （2）, have been isolated from the roots of Cynanchum auriculatum Royle ex Wight. The structure of cyanoauriculoside A （1） was determined to be 20-O-acetyl-penupogenin-3-O-β-D- glucopyranosyl-（ 1 →4）-β-D-glucopyranosyl-（ 1 →4）-α -L-cymaropyranosyl- （ 1 →4）-β-D-cymaropyranosyl- （ 1 →4）-α-L-diginopyranosyl-（1→4）-β-D-cymaropyranoside. Cyanoauriculoside B （2） was characterized as 20-O-acetylpenupogenin-3-O-β-D-gluco- pyranosyl-（ 1 →4）-α-L-cymaropyranosyl-（ 1 →4）-β-D-cymaropyranosyl-（ 1 →4）-α-L-diginopyranosyl-（ 1 →4）-β-D-cymaropyranoside. The structures of these compounds were elucidated based on the chemical and spectroscopic evidence.
Two new steroidal glycosides named cyanoauriculoside A （1） and B （2）, have been isolated from the roots of Cynanchum auriculatum Royle ex Wight. The structure of cyanoauriculoside A （1） was determined to be 20-O-acetyl-penupogenin-3-O-β-D- glucopyranosyl-（ 1 →4）-β-D-glucopyranosyl-（ 1 →4）-α -L-cymaropyranosyl- （ 1 →4）-β-D-cymaropyranosyl- （ 1 →4）-α-L-diginopyranosyl-（1→4）-β-D-cymaropyranoside. Cyanoauriculoside B （2） was characterized as 20-O-acetylpenupogenin-3-O-β-D-gluco- pyranosyl-（ 1 →4）-α-L-cymaropyranosyl-（ 1 →4）-β-D-cymaropyranosyl-（ 1 →4）-α-L-diginopyranosyl-（ 1 →4）-β-D-cymaropyranoside. The structures of these compounds were elucidated based on the chemical and spectroscopic evidence.
基金
financial support of this work by the National Key Technology R&D Program in the 11th Five Year Plan of China(No.2007BAI48B08)
