Abstract
Macrocyclic Spermidine Alcaloids from Pleurostylia africana LOES.The structure of pleurostyline, a new macrocyclic spermidine alkaloid from Pleurostylia africana (Celastraceae), has been elucidated mainly by 1H‐ and 13C‐NMR.‐spectroscopy. Pleurostyline represents a new structure type in which spermidine is incorporated in a 13‐membered lactam ring to which an additional cinnamoyl residue is fused to yield a 7‐membered ring. The same plant contains also the spermidine alkaloids celacinnine and cellallocinnine of which 13C‐ and high field 1H‐NMR.‐measurements have been carried out for the first time. Both alkaloids are interconvertible by UV.‐irradiation. In addition the existence of rotational isomerism of one amide group of these alkaloids has been demonstrated by NMR.‐spectroscopy.
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