1: 97 percent / pyridine 2: 88 percent / dimethylformamide / 1 h / 0 °C 3: 90 percent / mCPBA 4: PyH*OTs / ethanol / 6 h / 60 °C 5: 95 percent / mCPBA / CH2Cl2 / 1 h / 25 °C 6: 96 percent / PyH*OTs / CH2Cl2 / 24 h / 25 °C 7: 1.) n-BuLi / 1.) THF, -78 deg C; 2.) -50 deg C, 2 h 8: 6 percent Na-Hg, Na2HPO4 / methanol / 24 h / 25 °C 9: pyridinium dichromate / dimethylformamide / 6 h / 25 °C View Scheme

1: 97 percent / pyridine 2: 88 percent / dimethylformamide / 1 h / 0 °C 3: 90 percent / mCPBA 4: PyH*OTs / ethanol / 6 h / 60 °C 5: 95 percent / mCPBA / CH2Cl2 / 1 h / 25 °C 6: 96 percent / PyH*OTs / CH2Cl2 / 24 h / 25 °C 7: 1.) n-BuLi / 1.) THF, -78 deg C; 2.) -50 deg C, 2 h 8: PyH*OTs / ethanol / 6 h / 60 °C 9: 6 percent Na-Hg, Na2HPO4 / methanol / 24 h / 25 °C 10: pyridinium dichromate / dimethylformamide / 6 h / 25 °C View Scheme