1: NH3, HgCl2 / tetrahydrofuran / 3 h 2: CH3COONH4 / acetic acid / 2.5 h / 55 °C 3: 90percent aq. formic acid / 10percent Pd on C / methanol / 3 h / 40 - 50 °C View Scheme

With  ammonia; mercury dichloride in  tetrahydrofuran T=0 - 23°C; 3 h;