1: m-chloroperbenzoic acid / CH2Cl2 / 1.) 0 deg C, 1 h, 2). RT, 4 h 2: 1.) sodium hydride / 1.) DMF, RT, 2.) DMF, 70 deg C, 20 h 3: sodium hydride, potassium hydride / dimethylsulfoxide / Ambient temperature 4: pyridinium p-toluenesulfonate, water / acetone / 10 h / Heating View Scheme