4-Substituted 1,2,3-benzotriazines are formed in high yield by oxidation of 1- and 2-amino-3-substituted indazoles; 1,2,3-benzotriazine itself is formed in the same way if nucleophiles are carefully excluded.
D. J. C. Adams, S. Bradbury, D. C. Horwell, M. Keating, C. W. Rees and R. C. Storr, J. Chem. Soc. D, 1971, 828 DOI: 10.1039/C29710000828
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