Studies on the Constituents of Hedera rhombea BEAN. II. On the Dammarane Triterpene Glycosides. (1)

Abstract

Four triterpene glycosides, named Kizuta saponins K₄ (I), K₅ (II), K₇ (III) and K_7C (IV), were isolated from the stem and bark of Hedera rhombea BEAN (Araliaceae). On the basis of chemical and physicochemical evidence, they were characterized as follows : I, 3-O-acetyl-20 (S)-dammar-24-ene-3β, 6α, 20, 26-tetraol 26-O-β-D-glucopyranoside ; II, 3-oxo-20 (S) -dammar-24-ene-6α, 20, 26-triol 26-O-β-D-glucopyranoside ; III, 20 (S) -dammar-24-ene-3β, 6α, 20, 26-tetrol 26-O-β-D-glucopyranoside ; IV, 20 (S) -dammar-24-ene-3β, 20, 26-triol 3, 26-di-O-β-D-glucopyranoside.