ammonia in diethyl ether T=-78 - 20°C; 16 h;

1: 81 percent / n-BuLi / diethyl ether / 4 h / -78 - 20 °C 2: 94 percent / NH2OH*HCl; pyridine / ethanol / 2 h / Heating 3: 94 percent / pyridine / 2 h / Heating 4: 96 percent / NH3 / diethyl ether / 16 h / -78 - 20 °C View Scheme