1: 1.) potassium carbonate / 1.) DMF, 100 deg C, 30 min; 2.) 100 deg C, 3 h 2: 87 percent / CHCl3 / 2 h / Ambient temperature 3: 56 percent / acetonitrile / 1 h / Heating View Scheme

1: 1.) K2CO3 / 1.) DMF, 65 deg C, 1 h, 2.) DMF, 100 to 105 deg C, 1.5 h 2: 74 percent / m-chloroperbenzoic acid / CHCl3 / 2 h / Ambient temperature 3: 73 percent / Et3N / ethanol / Heating 4: 73 percent / aq. HCl / Heating View Scheme