1: 5.9 g / 7 h / 230 °C 2: 5.4 g / NBS, AIBN / acetic anhydride / 1.5 h / Heating 3: 4.1 g / methanol / 2 h / Heating 4: 2.3 g / Et3N, diphenylphosphoryl azide / 6 h / Heating 5: 1.8 g / HCl / diethyl ether 6: 1.) NaNO2, HCl, 2.) CuCl, HCl / 1.) H2O, 0 deg C View Scheme