SCHEDULED MAINTENANCE:
1-Aryl-2-(1-diazoethyl)cyclopentenes (7) are the first 1-aryl-3-diazoalkenes to undergo both 1,5- and 1,7- cyclisation to give 3H-pyrazoles and 3H-1,2-benzo-diazepines; the strained pyrazoles (8) undergo a ring expansion to the benzodiazepines (9) rather than a thermal van Alphen rearrangement.
J. Dingwall and J. T. Sharp, J. Chem. Soc., Chem. Commun., 1975, 128 DOI: 10.1039/C39750000128
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