Pd‐Catalyzed Reductive Cyclization of Nitroarenes with CO2 as the CO Source

A reductive amination process that constructs indoles, carbazoles or benzimidazoles from nitroarenes - irrespective of their electronic or steric nature - was developed that uses CO2 as the source of CO. The process is robust, tolerating common gaseous components of flue gas (H2S, SO2, NO and H2O) without adversely affecting the reductive cyclization.