Treatment of the 1H-1,2-thienodiazepine (1) and the 1H-1,2-benzodiazepines (7) having an electron-donating substituent in the 7-position with ethyl chloroformate, acetyl chloride, or benzoyl chloride in benzene results in ring-conversion to give the corresponding 1,3-diazepines (3) and (12).
J. Kurita, M. Enkaku and T. Tsuchiya, J. Chem. Soc., Chem. Commun., 1982, 990 DOI: 10.1039/C39820000990
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