Studies on the Constituents of Hedera rhombea BEAN. III. On the Dammarane Triterpene Glycosides. (2)

Abstract

On the basis of chemical and physicochemical evidence, the structures of four dammarane triterpene glycosides, named Kizuta saponins K_7A (I), K_7B (VII), K₉ (X) and K₁₃ (XII), which were isolated from the stem and bark of Hedera rhombea BEAN (Araliaceae), were established as follows : I, 3-oxo-20 (S)-dammar-24-ene-6α, 20, 21, 26-tetraol 26-O-β-D-glucopyranoside ; VII, 20 (S)-dammar-24-ene-3β, 6α, 20, 21, 26-pentaol 26-O-β-D-glucopyranoside ; X, 20 (S)-dammar-24-ene-3β, 6α, 20, 26-tetraol 3, 26-di-O-β-D-glucopyranoside ; XII, 20 (S)-dammar-24-ene-3β, 6α, 20, 26-tetraol 3-O-β-sophoroside-26-O-β-D-glucopyranoside.