1: 90 percent / aq. K2CO3 / CH2Cl2 / 0.5 h / 20 °C 2: 93 percent / Dowex 50W-X8 / aq. methanol / 18 h / 20 °C 3: 99 percent / imidazole / CH2Cl2 / 1 h / 20 °C 4: 92 percent / Et3N / tetrahydrofuran / 0.33 h / 20 °C 5: 90 percent / tetrabutylammonium fluoride / tetrahydrofuran / 2 h / 20 °C 6: 65 percent / NaOAc; H2 / Pd/C / methanol / 6 h / 60 °C 7: 92 percent / Dowex 50W-X8; H2O / tetrahydrofuran / Heating View Scheme