1H and 13C NMR Study of Indoloquinolizines obtained from tryptamine and acetylacetaldehyde.


The NMR studies shown here demonstrate clearly the structure of the synthesized indoloquinolizines. Surprisingly, compound 9 does not present a zwitterionic structure, but a structure devoid of centers of charge with an exocyclic double bond on the pyridinic ring. A later publication will give a more detailed explanation of the observed chemical shifts.

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