Cu/N,N′‑Dibenzyloxalamide-Catalyzed N‑Arylation of Heteroanilines

N,N′-Dibenzyloxalamide (DBO) was identified as a powerful ligand for promoting Cu-catalyzed coupling of heteroanilines with (hetero)­aryl halides. For (hetero)­aryl chlorides, the coupling reaction occurred at 130 °C with 5 mol % CuBr and 10 mol % DBO. For (hetero)­aryl bromides/iodides, coupling reaction took place at 80–100 °C with 1 mol % CuI and 2 mol % DBO. A variety of heteroanilines worked well to afford the arylation products in good to excellent yields.