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Synthesis of 1,2,3-Benzotriazine-4(3H)-ones

Recent Literature

Redox Cyclization of Amides and Sulfonamides with Nitrous Oxide for Direct Synthesis of Heterocycles
Z. Lai, C. Wang, J. Li, S. Cui, Org. Lett., 2020, 22, 2017-2021.

An oxidative rearrangement of 3-aminoindazoles provides diversely functionalized 1,2,3-benzotriazine-4(3H)-ones in good yields at room temperature. Water as cosolvent facilitates the halogen-induced ring expansion of 3-aminoindazoles under oxidative conditions.
Y. Zhou, Y. Wang, Y. Lou, Q. Song, Org. Lett., 2018, 20, 6494-6497.

A Pd(0) catalyzed carbonylative annulation reaction of 1-(2-iodophenyl)-3-aryltriaz-1-enes gave the corresponding 3-arylbenzo-1,2,3-triazin-4(3H)-ones with high selectivity and in excellent yields in the presence of 1 atm of carbon monoxide, whereas 1-aryl-(1H)-benzo-1,2,3-triazoles are provided in good yields in the presence of catalytic amounts of PPh3.
A. Chandrasekhar, S. Sankararaman, J. Org. Chem., 2017, 82, 11487-11493.