1: 95 percent / Et3N / dioxane; H2O / 4 h / Ambient temperature 2: Et3N / tetrahydrofuran / 0.5 h / -10 °C 3: NaBH4 / H2O; tetrahydrofuran / 4 h / Ambient temperature 4: pyridine / -5 °C 5: NaI / acetone / 4 h / Heating 6: tetrahydrofuran / 0.17 h / -50 °C 7: 2N NaOH / dioxane; H2O / Ambient temperature View Scheme