1: 1.) sodium hydride / 1.0 DMF, 2.) DMF, 16 h 2: 90 percent / aq. methanolic sodium hydroxide / 3 h / Heating 3: thionyl chloride 4: aluminum chloride / CH2Cl2 / 0.5 h / 0 °C 5: CH2Cl2; diethyl ether / 0.5 h 6: silver benzoate / 0.08 h / Heating 7: 71 percent / conc. hydrochloric acid / acetic acid / 4 h / Heating View Scheme