1: 93 percent / NaBH4 / ethanol 2: 93 percent / K2CO3 / methanol / 1 h / 0 °C 3: 1) methyl triflate, 2) N-methylimidazole / 1) THF, 0 deg C, 40 min, 2) THF 4: 89 percent / H2, NaOAc / 10percent Pd/C / methanol 5: 95 percent / CF3COOH / H2O; dioxane View Scheme