Fig. 2: Different nitroso-radical sources^[a].

^[a] Unless otherwise specified, the reactions were performed in the presence of 1a (0.2 mmol), [NO] 2 (2.0 equiv.), CuI (20 mol%), 1,10-phen (30 mol%), K₂CO₃ (2.0 equiv.), H₂O (5.0 equiv.) and DMSO (1.0 mL) under N₂ at 110 °C for 1 h.