1: 93 percent / NH3 / CHCl3 / 0.5 h / 0 °C 2: 74 percent / trifluoroacetic anhydride, pyridine / tetrahydrofuran / 0.67 h / Ambient temperature 3: 81 percent / H2 / Pt / ethyl acetate / 6 h View Scheme

ammonia in chloroform T=0°C; 0.5 h;