Photolysis of 2-(3-aminopropyl)phenyl azides 6 gives 2,3,4,4a-tetrahydro-1H-pyrido[2,3-b]azepines 7 in good yields, which are formed by intramolecular trapping of the ring-expanded didehydroazepine intermediate with an amino group.
S. Murata, M. Miwa and H. Tomioka, J. Chem. Soc., Chem. Commun., 1995, 1255 DOI: 10.1039/C39950001255
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