Cu-Catalyzed Denitrogenative Ring-Opening of 3-Aminoindazoles for the Synthesis of Aromatic Nitrile-Containing (Hetero)Arenes.

An unprecedented Cu-catalyzed oxidative cleavage of two C-N bonds of 3-aminoindazoles is reported herein, which represents the first example for denitrogenative ring-opening of 3-aminoindazoles. This novel reactivity of 3-aminoindazoles enables the production of diverse aromatic nitrile-containing (hetero)arenes via C-H arylation of (hetero)arenes with wide subsrate scope under mild conditions.