Triterpene glycosides from the bark of Robinia pseudo-acacia L. I

Article abstract of DOI:10.1248/cpb.40.2995

From the bark of Robinia pseudo-acacia L., five new triterpene glycosides, robiniosides A-D (3, 5-7) and compound III (4), were isolated and their structures were elucidated as 3-O-α-L-rhamnopyranosyl(1 → 2)-β-D-glucopyranosyl(1 → 2)-β-D-glucuronopyranosyl 3β,22β-dihydroxyolean-12-en-29-oic acid (3), 3-O-α-L-rhamnopyranosyl(1 → 2)-β-D-galactopyranosyl(1 → 2)-β-D-glucuronopyranosyl 3β,22β,24-trihydroxyolean-12-en-29-oic acid (4), whose sapogenol was unambiguously characterized and designated as oxytrogenin, 3-O-α-L-rhamnopyranosyl(1 → 2)-β-D-glucopyranosyl(1 → 2)-β-D-glucuronopyranosyl oxytrogenin (5), 3-O-α-L-rhamnopyranosyl(1 → 2)-β-D-galactopyranosyl(1 → 2)-β-D-glucuronopyranosyl oxytrogenin 22-O-α-L-rhamnopyranoside (6), 3-O-α-L-rhamnopyranosyl(1 → 2)-β-D-glucopyranosyl(1 → 2)-β-D-glucuronopyranosyl oxytrogenin 22-O-α-L-rhamnopyranoside (7), respectively, together with two known triterpene glycosides, kaikasaponin III (1) and 3-O-α-L-rhamnopyranosyl(1 → 2)-β-D-galactopyranosyl(1 → 2)-β-D-glucuronopyranosyl 3β,22β-dihydroxyolean-12-en-29-oic acid (2).

Full text of DOI:10.1248/cpb.40.2995

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