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For the first time the NMR spectra of quinolizidine alkaloid with Cu(II) are studied. Structures of new complexes of (−)-cytisine with Cu+2 and Zn+2 cations are visualized, discussed in detail and characterized by spectroscopic methods: ESI-MS, NMR, UV–vis, EPR and crystallographic methods. In solution metal coordinates through the protonated nitrogen atoms of secondary amino groups (in piperidine...
The 13 C NMR spectrum of (–)-N-benzoylcytisine perchlorate does not show a double set of signals typical of amide compounds, although this effect has been observed for the other diamine derivatives of cytisine. This observation means that in solution there must be the state of equilibrium between two forms of the cation with the protonated amide groups. DFT calculations have indeed indicated...
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