Absolute configuration of resveratrol oligomer glucosides isolated from the leaves of Upuna borneensis
Tetsuro Ito, Hiromi Ito, Munekazu Iinuma
A comprehensive investigation of the chemical constituents of the leaves of Upuna borneensis (Dipterocarpaceae) was performed. Three new glucosides of resveratrol oligomers having a pentameric aglycone [upunoside E (1)] and dimeric aglycones [upunosides F (3) and G (4)], as well as 14 resveratrol derivatives (2, 5–17), were isolated. The absolute configurations of the new compounds were elucidated by spectroscopic analysis, including two-dimensional NMR and CD spectra.
Circular dichroism, Absolute configuration, Pharmaceutical