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Planta Med 1988; 54(4): 352-355
DOI: 10.1055/s-2006-962456
DOI: 10.1055/s-2006-962456
Papers
© Georg Thieme Verlag Stuttgart · New York
1H- and 13C-NMR Spectroscopic Studies of Selected Quassinoids
Weitere Informationen
Publikationsverlauf
1987
Publikationsdatum:
24. Januar 2007 (online)
![](https://www.thieme-connect.de/media/plantamedica/198804/lookinside/thumbnails/10.1055-s-2006-962456-1.jpg)
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.