1.1: triethylamine; sodium bicarbonate / CH2Cl2 / 1 h / Heating 1.2: pyrrolidine / CH2Cl2 / 2 h / Heating 1.3: aq. HCl / CH2Cl2 2.1: zinc dust; copper(I) chloride / tetrahydrofuran / 2 h / 0 - 20 °C View Scheme

1: With sodium hydrogencarbonate; triethylamine in dichloromethane 1 h; Heating; 2: With pyrrolidine in dichloromethane 2 h; Heating; 3: With hydrogenchloride in dichloromethane