Abstract
Eleven triterpenoid saponins were isolated from the leaves of a Chinese folk medicine, Acanthopanax senticosus (RUPR. et MAXIM) HARMS. Of these compounds, three were identified as known saponins. The structures of eight new saponins named ciwujianosides B (1), C1, (2), C2 (3), C3, (4), C4 (5), D1, (6), D2 (7), and E (8) were elucidated to be as follows : (1), 3-O-α-rhamnopyranosyl-(1→2)-β-arabinopyranosyl-30-norolean-12, 20(29)-dien-28-oic acid 28-O-α-rhamnopyranosyl-(1→4)-β-glucopyranosyl-(1→6)-β-glucopyranosyl ester; (2), 3-O-α-arabinopyranosyl-30-norolean-12, 20(29)-dien-28-oic acid 28-O-α-rhamnopyranosyl-(1→4)-β-glucopyranosyl-(1→6)-β-glucopyranosyl ester; (3), 3-O-α-rhamnopyanosyl-(1→2)-α-arabinopyranosyl-30-norolean-12, 20(29)-dien-28-oic acid 28-O-α-rhamnopyranosyl-(1→4)-6-O-acetyl-β-glucopyranosyl-(1→6)-β-glucopyranosyl ester; (4), 3-β-arabinopyranosyl oleanolic acid 28-O-α-rhamnopyranosyl-(1→4)-β-glucopyranosyl(1→6)-β-glucopyranosyl ester; (5), 3-O-α-rhamnopyranosyl-(1→2)-α-arabinopyranosyl oleanolic acid 28-O-α-rhamnopyranosyl-(1→4)-6-O-acetyl-β-glucopyranosyl-(1→6)-β-glucopyranosyl ester; (6), 3-O-α-arabinopyranosyl oleanolic acid 28-O-α-rhamnopyranosyl-(1→4)-6-O-acetyl-β-glucopyranosyl(1→6)-β-glucopyranosyl ester; (7), 3-O-α-arabinopyranosyl-30-norolean-12, 20(29)-dien-28-oic acid 28-O-α-rhamnopyranosyl-(1→4)-6-O-acetyl-β-glucopyranosyl-(1→6)-β-glucopyranosyl ester; (8), 3-O-α-rhamnopyranosyl-(1→2)-α-arabinopyranosyl-30-norolean-12, 20-(29)-dien-28-oic acid.
