1: 100 percent / tetrahydrofuran; H2O / 0 °C 2: 95 percent / pyridine / 0 °C 3: TsOH / methanol; H2O / 72 h / Ambient temperature 4: amberlite IRA-400/OH(1-) 5: Collins reagent / CH2Cl2 / 5 °C 6: tetrahydrofuran / 0 °C 7: 58 percent / NaBH4 / ethanol; various solvent(s) / 1 h / Heating 8: H2, 10percent Pd/C / ethanol / 1551.4 Torr 9: 60 percent / ethanol / Heating 10: 60 percent / NaBH4 / ethanol; tetrahydrofuran / Heating 11: 75 percent / 6N HCl / tetrahydrofuran / Ambient temperature View Scheme