1: trifluoromethylsulfonic anhydride; alpha-chloropyridine / dichloromethane / 0.33 h / -78 °C / |Inert atmosphere 2: boron trifluoride diethyl etherate / dichloromethane / 20 h / 20 °C View Scheme

alpha-chloropyridine; trifluoromethylsulfonic anhydride in dichloromethane T=-78°C; 0.333333 h; Inert atmosphere; regioselective reaction;