1: tetrahydrofuran / 25 °C 2: 96 percent / pyridine / 25 °C 3: 88 percent / EtAlCl2 / CH2Cl2 / 25 °C 4: 98 percent / hydrogen / Pd/C / ethanol / 25 °C 5: 92 percent / diisobutylaluminum hydride / CH2Cl2; toluene / -78 °C 6: 89 percent / tetrahydrofuran / 25 °C 7: 1.) Hg(OAc)2, 2.) NaBH4 / 1.) THF, H2O, 2.) 25 deg C 8: PCC / CH2Cl2 / 25 °C 9: 98 percent / tetrahydrofuran / 25 °C 10: tetrahydrofuran / 1 h / -78 °C 11: (Bu)4NF / tetrahydrofuran / 25 °C View Scheme