sulfuric acid in tetrahydrofuran 24 h; Ambient temperature;

1: pyridine 2: 80 percent MCPBA / CH2Cl2; various solvent(s) / 4 h / Ambient temperature 3: 1 percent aq. H2SO4 / tetrahydrofuran / 24 h / Ambient temperature View Scheme

1: 80 percent MCPBA / CH2Cl2; various solvent(s) / 4 h / Ambient temperature 2: 1 percent aq. H2SO4 / tetrahydrofuran / 24 h / Ambient temperature View Scheme

1: NaIO4 / H2O; tetrahydrofuran / 0 deg C, 1 h, RT, 6 h 2: 72 percent / NaBH4, CeCl3*7H2O / ethanol; H2O / 0.17 h / -15 °C View Scheme