1,2,4-Benzoxadiazines (1) are converted into the corresponding benzoxazoles (2) in good yields by heating in solvents at 80–140 °C; a mechanism involving π4a+π2a cyclisation of an ortho-quinoneimine intermediate is suggested.
T. L. Gilchrist, C. J. Harris, M. E. Peek and C. W. Rees, J. Chem. Soc., Chem. Commun., 1975, 962 DOI: 10.1039/C39750000962
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