ammonia; lithium; tert-butyl alcohol in tetrahydrofuran T=-40°C; 0.25 h;

1: 90 percent / Li, NH3, t-BuOH / tetrahydrofuran / 0.25 h / -40 °C 2: 70 percent / Ph3P, diethyl azodicarboxylate / toluene / 0.5 h View Scheme