1H- and13C-NMR Spectroscopic Studies of Selected Quassinoids
- 1 August 1988
- journal article
- research article
- Published by Georg Thieme Verlag KG in Planta Medica
- Vol. 54 (04) , 352-355
- https://doi.org/10.1055/s-2006-962456
Abstract
The 13C-NMR spectra of some selected C20 quassinoids have been investigated. Unambiguous assignments were obtained through one-bond and long-range heteronuclear correlation spectroscopy. Some previous assignments have been corrected and ambiguities clarified. The usefulness of one-dimensional, long-range, proton-carbon correlation for the structure elucidation of the highly functionalized picrasan skeleton has been demonstrated. Proton homonuclear spectroscopy (COSY and delayed COSY) was useful for establishing the relative stereochemistry at C-1 and C-12, and several diagnostic, long-range couplings are reported for the first time for the picrasan skeleton.This publication has 1 reference indexed in Scilit:
- Plants as Sources of Antimalarial Drugs. Part 31Eurycoma longifoliaPlanta Medica, 1986