Iridium(III)-Catalyzed Regioselective B(4)–H Amination of o‑Carboranes with Sufilimines

Iridium(III)-catalyzed regioselective B(4)–H amination is developed from the reaction of o-carborane acids with sulfilimines without any oxidants under mild conditions, which leads to a wide range of B(4)–H aminated o-carboranes in good yields with a broad substrate scope. Moreover, the selective B(3,6)-diamination reaction of the o-carborane acid was achieved. The present reaction is attractive from a practical point of view because dibenzothiophene is quantitatively recovered and reused.