1: 85 percent / tetrahydrofuran / 60 h / Ambient temperature 2: 92 percent / MCPBA / CH2Cl2 / 0.33 h / 0 °C 3: 97 percent / AcONa / 7 h / Heating 4: 71 percent / tetrahydrofuran / 4 h / -90 °C 5: 98 percent / pyridine / 1 h / 0 °C 6: 89 percent / amberlyst 15 / 84 h / Ambient temperature 7: 98 percent / Et3N / CH2Cl2 / 1.5 h / 0 °C 8: 88 percent / AcOH-H2O / 13 h / 60 °C 9: 90 percent / imidazole / dimethylformamide / 0.5 h / Ambient temperature 10: 87 percent / K2CO3 / methanol / 9 h / Ambient temperature 11: 93 percent / n-Bu4NF, H2O / tetrahydrofuran / 0.04 h / 0 °C 12: 81 percent / MnO2 / CH2Cl2 / 0.4 h / Ambient temperature 13: 63 percent / ceric ammonium nitrate (CAN), pyridine / acetonitrile; CH2Cl2; H2O / 1 h / 0 °C 14: 70 percent / PPh3, DEAD / tetrahydrofuran / 1 h / Ambient temperature View Scheme