1: 46 percent / PCC; Celite / CH2Cl2 2: 80 percent / p-TsOH*H2O / acetone / 25 h / 20 °C 3: PDC; Celite / dimethylformamide / 52 h / 20 °C 4: 1.11 g / tetrahydrofuran; diethyl ether / 0 °C 5: 97 percent Turnov. / diethyl ether / 20 h / 20 °C 6: 100 percent / p-TsOH*H2O / methanol / 24 h / 60 °C 7: pyridine / 3 h / 20 °C 8: 165 mg / pyridine; 4-(dimethylamino)pyridine / 27 h / 20 °C 9: 99 percent / HF / acetonitrile / 7 h / 20 °C 10: H2CrO4 / acetone / 6 h / 0 - 20 °C 11: aq. NaOH / 10 h / 20 °C 12: 96 percent / bis(2-oxo-3-oxazolidinyl)phosphinic chloride; Et3N / CH2Cl2 / 3 h / 20 °C View Scheme

1: 46 percent / PCC; Celite / CH2Cl2 2: 80 percent / p-TsOH*H2O / acetone / 25 h / 20 °C 3: PDC; Celite / dimethylformamide / 52 h / 20 °C 4: 1.11 g / tetrahydrofuran; diethyl ether / 0 °C 5: 97 percent Turnov. / diethyl ether / 20 h / 20 °C 6: 100 percent / p-TsOH*H2O / methanol / 24 h / 60 °C 7: pyridine / 3 h / 20 °C 8: 165 mg / pyridine; 4-(dimethylamino)pyridine / 27 h / 20 °C 9: 99 percent / HF / acetonitrile / 7 h / 20 °C 10: H2CrO4 / acetone / 6 h / 0 - 20 °C 11: aq. NaOH / 10 h / 20 °C View Scheme