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2-Alkoxy-indoles 2a, b can be regarded as cyclic ketene-N.O -acetals. Their regiospecific [4+2]- Diels-Alder reaction with inverse electron demand with the triazine 3 yield in a one step addition the γ-carboline (4).

zeitschrift für naturforschung b

Lactamacetale als potentielle Enamin-Synthone in Heterocyclensynthesen, 4. Mitteilung Einstufen-Synthese des γ-Carbolingerüsts durch Diels-Alder-Reaktion von Indol-„Keten-N,O-acetalen“/ Lactam Acetals as Potential Enamine Synthons in Heterocyclic Synthesis, 4th Communication. One Step Synthesis of the γ-Carboline Frame via Diels-Alder Reaction of Indol-“Ketene-N.O-Acetals”