2,3,4,5-Tetrahydro-3-benzazepin-1-one and its 3-benzyloxycarbonyl and 3-methyl derivatives have been synthesised from 2,3,4,5-tetrahydro-3-p-tolylsulphonyl-3-benzazepin-1-one. 2,3,4,5-Tetrahydro-7,8-dimethoxy-3-p-tolylsulphonyl-3-benzazepin-1-one was made by cyclisation of the corresponding glycine in polyphosphoric acid at 20° but all attempts to cyclise N-alkylglycines failed.
M. Lennon, A. McLean, G. R. Proctor and I. W. Sinclair, J. Chem. Soc., Perkin Trans. 1, 1975, 622 DOI: 10.1039/P19750000622
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