Abstract A transition-metal-free oxidative C [BOND] N coupling method has been developed for the synthesis of 1H-azaindazoles and 1H-indazoles from easily accessible hydrazones. The procedure uses TEMPO, a basic additive, and dioxygen gas as the terminal oxidant. This reaction demonstrates better reactivity, functional group tolerance, and broader scope than comparable metal catalyzed reactions.
![Bis[(2H5)phenyl]methanone Structure](https://image.chemsrc.com/caspic/059/22583-75-1.png)