The structure of regalamine
SummaryOn the basis of UV, IR, NMR, and mass spectra and chemical transformations the structure of 11,12-dihydroxy-2-methoxy-1,12-epoxyhexahydrohomoproaporphine has been proposed for regalamine.
Alkaloids from croton species. VI. Mass spectrometric studies of the crotonosine alkaloids.
The mass spectra of crotonosine and some related compounds are reported and the composition of the major fragments determined by high-resolution mass measurements. Modes of fragmentation are discussed. In addition the mass spectra of the model compound tetrahydroisoquinoline and its N-methyl and N-acetyl derivatives are reported and discussed.
Konstitution und Reaktionen des (+)‐Pronuciferins 3. Mitteilung über natürliche und synthetische Isochinolinderivate
Constitution and reactions of the isoquinoline-dienone alkaloid (+)-pronuciferine are described. The latter include reduction with complex hydrides, transformation into (−)-nuciferine, catalytic hydrogenation, and dienone-phenol-rearrangement to (−) -3-hydroxy-5,6-dimethoxy-aporphine.