1: 84 percent / BF3*OEt2 / CH2Cl2 / 8 h / -80 °C 2: 65 percent / Et3N, 4-(N,N-dimethylamino)pyridine / CH2Cl2 / 4 h / Ambient temperature 3: pyridine / 3 h / Ambient temperature 4: dicyclohexane-crown-6, KMnO4 / CH2Cl2 / 1) 15 deg C, 3 h, 2) room temp., 3 h 5: pyridine / 5 h / Ambient temperature 6: DIBALH / CH2Cl2 / 5 h / -80 °C 7: citric acid / methanol / 3 h / Ambient temperature 8: pyridine, DMAP / 5 h / Ambient temperature 9: 70percent aq. AcOH / 6 h / 60 °C 10: NaIO4 / RuO2*H2O / acetone; H2O / 3 h / Ambient temperature 11: diethyl ether View Scheme

1: pyridine / 3 h / Ambient temperature 2: dicyclohexane-crown-6, KMnO4 / CH2Cl2 / 1) 15 deg C, 3 h, 2) room temp., 3 h 3: pyridine / 5 h / Ambient temperature 4: DIBALH / CH2Cl2 / 5 h / -80 °C 5: citric acid / methanol / 3 h / Ambient temperature 6: pyridine, DMAP / 5 h / Ambient temperature 7: 70percent aq. AcOH / 6 h / 60 °C 8: NaIO4 / RuO2*H2O / acetone; H2O / 3 h / Ambient temperature 9: diethyl ether View Scheme

1: 65 percent / Et3N, 4-(N,N-dimethylamino)pyridine / CH2Cl2 / 4 h / Ambient temperature 2: pyridine / 3 h / Ambient temperature 3: dicyclohexane-crown-6, KMnO4 / CH2Cl2 / 1) 15 deg C, 3 h, 2) room temp., 3 h 4: pyridine / 5 h / Ambient temperature 5: DIBALH / CH2Cl2 / 5 h / -80 °C 6: citric acid / methanol / 3 h / Ambient temperature 7: pyridine, DMAP / 5 h / Ambient temperature 8: 70percent aq. AcOH / 6 h / 60 °C 9: NaIO4 / RuO2*H2O / acetone; H2O / 3 h / Ambient temperature 10: diethyl ether View Scheme

1: pyridine, DMAP / 5 h / Ambient temperature 2: 70percent aq. AcOH / 6 h / 60 °C 3: NaIO4 / RuO2*H2O / acetone; H2O / 3 h / Ambient temperature 4: diethyl ether View Scheme

1: citric acid / methanol / 3 h / Ambient temperature 2: pyridine, DMAP / 5 h / Ambient temperature 3: 70percent aq. AcOH / 6 h / 60 °C 4: NaIO4 / RuO2*H2O / acetone; H2O / 3 h / Ambient temperature 5: diethyl ether View Scheme

1: DIBALH / CH2Cl2 / 5 h / -80 °C 2: citric acid / methanol / 3 h / Ambient temperature 3: pyridine, DMAP / 5 h / Ambient temperature 4: 70percent aq. AcOH / 6 h / 60 °C 5: NaIO4 / RuO2*H2O / acetone; H2O / 3 h / Ambient temperature 6: diethyl ether View Scheme

1: NaIO4 / RuO2*H2O / acetone; H2O / 3 h / Ambient temperature 2: diethyl ether View Scheme

1: 70percent aq. AcOH / 6 h / 60 °C 2: NaIO4 / RuO2*H2O / acetone; H2O / 3 h / Ambient temperature 3: diethyl ether View Scheme

in diethyl ether Yield given;