Saponins and acylated saponins from Dizygotheca kerchoveana

• Published in: Phytochemistry (Oxford) 2004-12, Vol.65 (23), p.3089-3095
• Main Authors: Melek, F.R., Miyase, Toshio, Abdel-Khalik, S.M., Mahmoud, I.I., Mina, S.A.
• Format: Article
• Language: English
• Subjects: acylation; Araliaceae; Araliaceae - chemistry; chemical structure; Dizygotheca kerchoveana; echinocystic acid; Hydrolysis; Magnetic Resonance Spectroscopy; Molecular Structure; ornamental trees; phytochemicals; plant extracts; Plant Leaves - chemistry; Plant Stems - chemistry; Saponins - chemistry; Saponins - isolation & purification; Schefflera; Schefflera kerchoveana; stereochemistry; Triterpenoid saponins
• ISSN: 0031-9422; 1873-3700
• DOI: 10.1016/j.phytochem.2004.08.049

Nine saponins and two acylated saponins were isolated from the leaves and the stem of branches of Dizygotheca kerchoveana . Their structures were established by chemical and spectroscopic means. Four new triterpenoid saponins were isolated from the leaves and stem of branches of Dizygotheca kerchoveana along with seven known ones. The new saponins were respectively characterized as 3- O-[β- d-glucopyranosyl-(1 → 3)]-[β- d-glucopyranosyl-(1 → 2)]-α- l-arabinopyranosyl echinocystic acid, 3- O-[β- d-glucopyranosyl-(1 → 3)]-[β- d-glucopyranosyl-(1 → 2)]-α- l-arabinopyranosyl echinocystic acid 28- O-[α- l-rhamnopyranosyl-(1 → 4)-β- d-glucopyranosyl-(1 → 6)-β- d-glucopyranosyl] ester, 3- O-[β- d-3- O- trans- p-coumaroyl-glucopyranosyl-(1 → 3)]-[β- d-glucopyranosyl-(1 → 2)]-α- l-arabinopyranosyl echinocystic acid 28- O-[α- l-rhamnopyranosyl-(1 → 4)-β- d-glucopyranosyl-(1 → 6)-β- d-glucopyranosyl] ester and 3- O-[β- d-3- O- cis- p-coumaroyl-glucopyranosyl-(1 → 3)]-[β- d-glucopyranosyl-(1 → 2)]-α- l-arabinopyranosyl echinocystic acid 28- O-[α- l-rhamnopyranosyl-(1 → 4)-β- d-glucopyranosyl-(1 → 6)-β- d-glucopyranosyl] ester. Their structures were elucidated by 1D and 2D NMR experiments, FAB-MS as well as chemical means.