Photolysis of the quinoline N-imides (3) having an electron-donating substituent in the 6- or 8-position affords the corresponding 3H-1,3-benzodiazepines (4), whereas quinolines having an electron-donating group in the other positions or an electron-withdrawing group give no diazepines.
T. Tsuchiya, S. Okajima, M. Enkaku and J. Kurita, J. Chem. Soc., Chem. Commun., 1981, 211 DOI: 10.1039/C39810000211
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