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Quinonylmethylenaminones 5 and 6 are synthesized and cyclized to spiro compounds 7 and 8. Quinonylpropylenaminone 15 is made in the same way. Cyclization in acetic acid yields quinolines 11 and 12, in trifluoroacetic acid/trifluoroacetic anhydrid diacylenamine 16 is obtained. The product of 15 in perchloric acid is benzazocine 20. The structure of 20 is proven by X-ray analysis. The course of the reaction is discussed.

zeitschrift für naturforschung b

Untersuchung zur 6-Hydroxyindol-Bildung bei der Nenitzescu-Reaktion, IV [1]. Cyclisierung von N-(Chinonylalkyl)enaminon-Derivaten, II [2] / Investigation on the Formation of 6-Hydroxyindole in the Nenitzescu Reaction, IV [1]. Cyclization of N-(Quinonylalkyl)enaminone Derivatives, II [2]