1.1: 97 percent / tetrahydrofuran / 2 h / -78 °C 2.1: 44 percent / BH3*THF / tetrahydrofuran / 1.5 h / 0 °C 3.1: MsCl / 1,2-dichloro-ethane / 1 h / 0 - 20 °C 3.2: 84 percent / Et3N / 1,2-dichloro-ethane / 48 h / Heating 4.1: 71 percent / n-Bu3SnH / AIBN / toluene / 2 h / Heating 5.1: 100 percent / LAH / tetrahydrofuran / 0.83 h / 0 - 20 °C View Scheme