1: 53 percent / HF*pyridine / tetrahydrofuran / 0 - 20 °C 2: 100 percent / LiHMDS / tetrahydrofuran / 0.67 h / 0 °C 3: 100 percent / BH3*Me2S / tetrahydrofuran / 24 h / 20 °C 4: H2O; p-toluenesulfonic acid / acetone / 6 h 5: H2 / Pd/C / methanol / 24 h / 20 °C 6: 60 percent / LiAlH4 / tetrahydrofuran / 15 h / Heating View Scheme