Cyclisierungen uber Enamin-zwischenstufen bei Amindehydrierungen

摘要

The mercury-edta dehydrogenation of the 4'-aminosubstituted-acetophenones 1, 8a and 9a produced the ring cleavaged derivatives 7, 11a and 12a, while the piperidine and its derivatives 10a-10e gave rise to tetracyclic compounds 16a-16e and to methylenedi-enamines 19a-19d, the additionally C-1-fragment in 19a-19d probably coming from mercury edta. With addition of m-nitrobenzaldehyde to the mercury-edta dehydrogenation of substituted phenylpiperidines another route only generated the di-enamines 22.