Methoxybenzylamino-acetonitriles with benzyl or phenethyl substituents attached to the nitrile α-carbon undergo spiro-cyclisation in concentrated sulphuric acid followed by rearrangement with cyclisation to the benzene ring of the substituent. The product is a tetrahydroisoquinoline or a 2-benzazepine depending on the substituent.
D. N. Harcourt, N. Taylor and R. D. Waigh, J. Chem. Soc., Perkin Trans. 1, 1978, 1330 DOI: 10.1039/P19780001330
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