Two new triterpenoid glycosides from Cyclocarya paliurus

Abstract

Two new dammarane triterpenoid glycosides named cyclocarosides B (1) and C (2) were isolated from the leaves of Cyclocarya paliurus. Based on FAB-MS, HRESI-MS, IR, ¹H NMR, ¹³C NMR, and 2D-NMR (HMQC, HMBC, COSY, ROESY) data, the structures of cyclocarosides B (1) and C (2) were elucidated as (20S,24R)-epoxydammarane (3β,12β)-25-hydroxyl-12-O-β-d-quinovopyranosyl-3-O-β-d-quinovopyranoside (1), and (20S,24R)-epoxydammarane (3β, 12β)-25-hydroxyl-12-O-α-l-arabinopyranosyl-3-O-(5′-O-acetyl)-α-l-arabinofuranoside (2).

Keywords:

• Cyclocarya paliurus
• Dammarane
• Triterpenoid glycosides
• Cyclocarioside B
• Cyclocarioside C

Acknowledgements

The authors are grateful to the members of the analytical group of State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, for measurements of all spectra.