27‐Ald‐triterpenoid saponins from Adina rubella

Four new triterpenoid saponins were isolated from the roots of Adina rubella Hance . They were characterized as adinaic acid 3β‐[α‐ L ‐rhamnopyranosyl(1→2)‐β‐ D ‐glucopyranosyl(1→2)‐β‐D‐glucurono‐pyranoside‐6‐ O ‐methyl ester]‐2‐ O ‐β‐D‐glucopyranoside, adinaic acid 3β‐ O ‐[ a ‐ L ‐rhamnopyranosyl(1→2)‐β‐ D ‐glucopyranosyl(1→2)‐β‐D‐glucuronopyranosid‐6‐ O ‐butyl ester]‐28‐ O ‐β‐ D ‐glu‐copyranoside, adinaic acid 3β‐ O ‐[β‐ D ‐glucopyranosyl(1→2)‐β‐ D ‐glucopyranosyl]‐(28→ l)‐β‐ D ‐glucopyranosyl(1→6)‐β‐ D ‐glucopyranosyl ester, 27‐hydroxyursolic acid 3β‐ O ‐[α‐ L ‐rhamnopyranosyl (1→ 2)‐β‐ D ‐glucopyranosyl(1→2)‐β‐ D ‐glucuronopyranoside‐6‐ O ‐methyl ester]‐28‐ O ‐β‐ D ‐glucopyranoside. Their structures wen elucidated by spectral methods, specially with the aid of 2D NMR techniques. Their complete assignments of the 1 H and 13 C NMR signals were carried out.