1: 42 percent / n-BuLi / tetrahydrofuran; hexane / 1.5 h / -78 °C 2: Et3N / CHCl3 / 14 h / 5 °C 3: 2.54 g / Li2CuCl4 / tetrahydrofuran / 18 h / 5 °C View Scheme

With  lithium aluminium tetrahydride in  tetrahydrofuran T=0°C;  Inert atmosphereReflux;