1: benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; triethylamine / dichloromethane / 6 h / 20 °C / |Cooling with ice 2: sodium hydrogencarbonate; potassium bromide; 2,2,6,6-tetramethyl-1-piperidinyloxy, free radical; sodium hypochlorite / dichloromethane / 20 h / 20 °C / |Cooling with ice View Scheme

Multi-step reaction with 2 steps 1: methanol / 48 h / 70 °C2: 5 palladium on charcoal; hydrogen / methanol / 48 h