1: 64 percent / Et3N / CH2Cl2 / 0 °C 2: 68 percent / m-chloroperbenzoic acid / CH2Cl2 / 0 °C 3: 60 percent / NaHCO3 / xylene / 25 h / Heating 4: Bu3SnH; 1,1'-azobis(cyclohexanecarbonitrile) / toluene / 1 h / Heating View Scheme

1: 91 percent / 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride; N-methylmorpholine / CH2Cl2 / 2 h / 0 °C 2: m-chloroperbenzoic acid / CH2Cl2 / 0 °C 3: 81 percent / NaHCO3 / xylene / 14 h / Heating 4: Bu3SnH; 1,1'-azobis(cyclohexanecarbonitrile) / toluene / 1 h / Heating View Scheme