1: 100 percent / BH3*Me2S / tetrahydrofuran / 24 h / 20 °C 2: H2O; p-toluenesulfonic acid / acetone / 6 h 3: H2 / Pd/C / methanol / 24 h / 20 °C 4: 60 percent / LiAlH4 / tetrahydrofuran / 15 h / Heating View Scheme