Four steroids were isolated from the ethyl acetate extract of the roots of Cynanchum otophyllum. Their structures were identified as qinyangshengenin-3-O-β-D-oleandropyranosyl-(1→4)-β-D-oleandropyranosyl-(1→4)-β-D-cymaropyranosyl-(1→4)-β-D-cymaropyranoside (1), gagamine (2), otophylloside B (3), and caudatin (4). Compound 1 is a new steroidal glycoside, and the structures of these compounds were established on the basis of chemical and spectroscopic methods.
Bioactive C<sub>21</sub> Steroidal Glycosides from the Roots of <i>Cynanchum otophyllum</i> That Suppress the Seizure-like Locomotor Activity of Zebrafish Caused by Pentylenetetrazole
Six new C-21 steroidal glycosides, cynotophyllosides A-F (1-6), together with 16 known compounds, were isolated from the roots of Cynanchum otophyllum. The structures of the new compounds were elucidated by spectroscopic analysis and chemical methods. The three major components, otophylloside F (15), otophylloside B (17), and rostratamine 3-O-beta-D-oleandropyranosyl-(1 beta-D-oleandropyranosyl-(1 -> 4)-beta-D-cymaropyranosyl (1 -> 4)-beta-D-cymaropyranoside), suppressed the seizure-like locomotor activity caused by pentylenetetrazole in zebrafish. Preliminary structure-activity relation studies revealed that a pregnene skeleton with a C-12 ester group (ikemaoyl > cinnamoyl > hydroxy > p-hydroxybenzoyl) and a C-3 sugar chain consisting of three 2,6-dideoxysaccharide units is essential for this suppressive activity.
Steroidal glycosides with anti-tumor activity from the roots of<i>Cynanchum wallichii</i>Wight
Two new steroidal glycosides characterized with 2,6-dideoxypyranoses as component sugars have been isolated from roots of Cynanchum wallichii Wight. Their structure elucidation and cytotoxic activities against HL-60 and PC-3 cells are reported.
Arshava, B. M.; Raifel'd, Yu. E.; Makin, S. M., Journal of Organic Chemistry USSR (English Translation), 1990, vol. 26, # 8.1, p. 1439 - 1445