1: 83 percent / hydroperoxide, vanadyl acetylacetonate / CH2Cl2 / 0 °C 2: ethanol; H2O / 16 h / Heating 3: toluene / Heating 4: 92 percent / methanesulfonyl chloride, triethylamine / CH2Cl2 / 0 °C 5: diisobutylaluminum hydride / toluene / -15 °C View Scheme

1: 83 percent / hydroperoxide, vanadyl acetylacetonate / CH2Cl2 / 0 °C 2: ethanol; H2O / 16 h / Heating 3: toluene / Heating 4: 92 percent / methanesulfonyl chloride, triethylamine / CH2Cl2 / 0 °C View Scheme