1: 90 percent / tetrabutylammonium fluoride / tetrahydrofuran / 2 h / 20 °C 2: 65 percent / NaOAc; H2 / Pd/C / methanol / 6 h / 60 °C 3: 92 percent / Dowex 50W-X8; H2O / tetrahydrofuran / Heating View Scheme