Compounds (1 a–c) undergo in boiling acetic acid a fast reaction to afford 1,4-dihydrocinnolines or 4,5-dihydro1H-1,2-benzodiazepines, which arise from a skeleton rearrangement involving cleavage of the cyclopropane ring. Fragmentation products are also obtained in the case of (1c).
L. Garanti and G. Zecchi, J. Chem. Soc., Perkin Trans. 1, 1979, 1195 DOI: 10.1039/P19790001195
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