1: 1.) BuLi / 1.) ether, hexane, -80 deg C, 15 min, 2.) ether, hexane, from -80 deg C to RT 2: aq. HCl / 2 h / 100 °C 3: 46 percent / ammonium acetate / 1 h / Heating 4: AlH3 / tetrahydrofuran / 0.5 h / Heating View Scheme