Several examples of cine-substitution of the benzocycloheptenone (benzotropone) system are reported. Under mild conditions, substituted benzotropones afford tricyclic amino-derivatives. It is also shown that cleavage of the troponoid ring of benzotropones with appropriate amines constitutes a new method of preparation of aromatic lactams.
J. Iriarte, C. Camargo and P. Crabbé, J. Chem. Soc., Perkin Trans. 1, 1980, 2077 DOI: 10.1039/P19800002077
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