Abstract
Several Lythraceae alkaloids containing either a trans-fused (decinine, decodine, decaline) or a cis-fused (decamine, verticillatine, vertaline) quinolizidine ring system were examined by high-field NMR spectroscopy. One- and two-dimensional NMR techniques were used in order to assign the 1H and 13C chemical shifts. The selective 1-D TOCSY experiment was particularly helpful for resolving the 1H signals of the quinolizidine ring of some of the alkaloids. The chemical shift data combined with two-dimensional NOE experiments differentiated the cis- and trans-quinolizidine rings and provided structural information that correlated well with structures derived from molecular modelling. Copyright © 2000 John Wiley & Sons, Ltd.
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