| Abstract
| - 3-Alkyl-1,4-dihydropyridines dimerize in acidic medium, atlow temperature, to give polycyclic imminium salts derivatives that were reduced to afford new polycyclic diaminescaffolds. The reaction can be extended to enantiopure seriesstarting from R-(+)- or S-(−)-1-phenylethylamine. Longexposure of the polycyclic imminium salt intermediates toair moisture at 20 °C resulted in formation of new amidederivatives. This is probably due to the addition of waterfollowed by an intramolecular oxido-reduction process.
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