NMR STUDY ON OLEUROPEIN

Oleuropein is a well-known secoiridoid glucoside which is rich in the Oleaceae fam- ily. Its structure was confirmed during 1960～1974. It has been isolated from many plants of the genus Olea, Fraxinus, Jasminum, Ligustrum and Syringa to date. Its NMR data has been reported, but the detailed elucidation has not been given. Our recent study on the leaves of Syringa pubescens Turcz. (a Chinese folk herb) has resulted in the isolation of this constituent for the first time. In this paper, by utilizing a combination of 1D and 2D NMR techniques, its 1H and 13C NMR spectra are completely assigned and detailedly analyzed and the characteristics of its NMR data are also pointed out.