1: 95 percent / HCl / 0.5 h / Heating 2: 74 percent / 85percent m-chloroperbenzoic acid / CH2Cl2 / 1 h / 0 °C 3: 1.) NaH / 1.) DMF, RT, 2.) 70 - 80 deg C, 5 h 4: 85percent KOH / methanol; H2O / 1 h / Heating View Scheme