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The Pictet-Spengler reaction of tryptamine type 1,2-dihydropyridine 5c derived from the cycloaddition of the sec-nitrodienamine 3c with acetaldehyde afforded the indoloquinolizine derivatives 6 and 7.

A New Synthesis of Indoloquinolizines by Pictet-Spengler Reaction of Tryptamine Type 1,2-Dihydropyridines Utilizing sec-Nitrodienamine.