1: 88 percent / AcOH-H2O / 13 h / 60 °C 2: 90 percent / imidazole / dimethylformamide / 0.5 h / Ambient temperature 3: 87 percent / K2CO3 / methanol / 9 h / Ambient temperature 4: 93 percent / n-Bu4NF, H2O / tetrahydrofuran / 0.04 h / 0 °C 5: 81 percent / MnO2 / CH2Cl2 / 0.4 h / Ambient temperature 6: 63 percent / ceric ammonium nitrate (CAN), pyridine / acetonitrile; CH2Cl2; H2O / 1 h / 0 °C 7: 70 percent / PPh3, DEAD / tetrahydrofuran / 1 h / Ambient temperature View Scheme