The acid-catalysed reaction of some α,β,γ,δ-unsaturated ketones with p-tolylsulphonylhydrazine gives 3,4-dihydro-2-tosyl-1,2-diazepines (5) in good yield and the base-induced elimination of p-toluenesulphinic acid from these provides the first synthesis of 3H-1,2-diazepines (6).
C. D. Anderson, J. T. Sharp, H. R. Sood and R. S. Strathdee, J. Chem. Soc., Chem. Commun., 1975, 613 DOI: 10.1039/C39750000613
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