1: 95 percent / mCPBA / CH2Cl2 / 1 h / 25 °C 2: 96 percent / PyH*OTs / CH2Cl2 / 24 h / 25 °C 3: 1.) n-BuLi / 1.) THF, -78 deg C; 2.) -50 deg C, 2 h 4: 6 percent Na-Hg, Na2HPO4 / methanol / 24 h / 25 °C 5: pyridinium dichromate / dimethylformamide / 6 h / 25 °C View Scheme

1: 95 percent / mCPBA / CH2Cl2 / 1 h / 25 °C 2: 96 percent / PyH*OTs / CH2Cl2 / 24 h / 25 °C 3: 1.) n-BuLi / 1.) THF, -78 deg C; 2.) -50 deg C, 2 h 4: PyH*OTs / ethanol / 6 h / 60 °C 5: 6 percent Na-Hg, Na2HPO4 / methanol / 24 h / 25 °C 6: pyridinium dichromate / dimethylformamide / 6 h / 25 °C View Scheme