Oxidative Rearrangement of 3-Aminoindazoles for the Construction of 1,2,3-Benzotriazine-4(3 H)-ones at Ambient Temperature.

A novel oxidative rearrangement of 3-aminoindazoles is reported, enabling the production of diverse functionalized 1,2,3-benzotriazine-4(3 H)-ones in good yields at room temperature. The key success of this unprecedented transformation of 3-aminoindazoles is the use of water as cosolvent, which could facilitate the halogen-induced ring expansion of 3-aminoindazoles under oxidative conditions.