Direct C3 Carbamoylation of 2H‐Indazoles

Abstract

AbstractWe developed a novel method for direct C3 carbamoylation of 2H‐indazoles using oxamic acids as carbamoyl radical sources. In the presence of ammonium persulfate, carbamoyl radicals were generated from oxamic acids, then used for further reactions with 2H‐indazoles to afford the desired products. The reaction proceeds under metal‐ and catalyst‐free conditions. This simple process allows for the efficient synthesis of C3 carbamoylated 2H‐indazoles, which are important scaffolds in organic synthesis.