The isolation of novel polycyclic products (7), (8), and (9) from the Bischler–Napieralski cyclization of various Nβ-acyltryptamines provides further evidence for the intermediacy of spiroindolenines in this reaction.
J. R. Frost, B. R. P. Gaudillière and A. E. Wick, J. Chem. Soc., Chem. Commun., 1985, 895 DOI: 10.1039/C39850000895
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