sodium tetrahydroborate; cerium(III) chloride in ethanol; water T=-15°C; 0.166667 h;

Multi-step reaction with 4 steps 1: pyridine2: 80 percent MCPBA / CH2Cl2; various solvent(s) / 4 h / Ambient temperature3: 1 percent aq. H2SO4 / tetrahydrofuran / 24 h / Ambient temperature4: NaIO4 / H2O; tetrahydrofuran / 0 deg C, 1 h, RT, 6 h  

Multi-step reaction with 3 steps 1: 80 percent MCPBA / CH2Cl2; various solvent(s) / 4 h / Ambient temperature2: 1 percent aq. H2SO4 / tetrahydrofuran / 24 h / Ambient temperature3: NaIO4 / H2O; tetrahydrofuran / 0 deg C, 1 h, RT, 6 h