The synthesis of some derivatives of the novel heterocyclic ring system pyrido[3,4‐ d ][1]benzazepine is reported. Thus, pyrido[3,4‐ d ][1]benzazepin‐7‐one 6 was prepared by cyclisation of the Michael adduct 5 with ammonium ferric sulfate. Reaction of 6 with phosphorus pentasulfide gave the thiolactam 7 , which after methylation and subsequent reaction with amines furnished the amidines 10 .
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Kunick et al. (1995) studied this question.