SCHEDULED MAINTENANCE
The reaction of triphenylphosphine with the o-acyloxy-5 and o-acylamino-azidocinnamates 9, prepared from salicylaldehyde and o-aminobenzaldehyde, results in ring closure to give the 1,3-benzoxazepines 7 and 1,3-benzodiazepines 12,via the intramolecular aza-Wittig reaction of the iminophosphoranes 6 and 10 initially formed, respectively.
J. Kurita, T. Iwata, S. Yasuike and T. Tsuchiya, J. Chem. Soc., Chem. Commun., 1992, 81 DOI: 10.1039/C39920000081
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