1: 1.) p-TsOH; 2.) m-CPBA / 1.) C6H6, reflux; 2.) CH2Cl2, 0 deg C to room temp. 2: 96 percent / K2CO3 / acetone / Heating 3: 60 percent / NaH, KH / dimethylsulfoxide / 24 h / 20 - 30 °C 4: p-TsOH*Py / acetone; H2O / 10 h / Heating View Scheme

1: p-toluenesulfonic acid / benzene / 4 h / Heating 2: m-chloroperbenzoic acid / CH2Cl2 / 1.) 0 deg C, 1 h, 2). RT, 4 h 3: 1.) sodium hydride / 1.) DMF, RT, 2.) DMF, 70 deg C, 20 h 4: sodium hydride, potassium hydride / dimethylsulfoxide / Ambient temperature 5: pyridinium p-toluenesulfonate, water / acetone / 10 h / Heating View Scheme