The acid-catalysed reactions of some substituted 2,4-dienones with p-tolylsulphonylhydrazine give 3,4-dihydro-2-tosyl-1,2-diazepines (8); other 2,4-dienones give only the p-tolylsulphonylhydrazones. The dependence of the mode of reaction on the substituents on the dienone, and the role of the acid in promoting the cyclisation have been investigated.
C. D. Anderson, P. N. Anderson and J. T. Sharp, J. Chem. Soc., Perkin Trans. 1, 1979, 1640 DOI: 10.1039/P19790001640
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