1: 98 percent / Br2 / CHCl3 / 1.5 h / Heating 2: 57 percent / NaOMe / CHCl3 3: 32 percent / Na2S2O6*2H2O / methanol; H2O / 18 h / Heating 4: 72 percent / Fe / acetic acid; ethanol / 1 h / Heating 5: 96 percent / tetrahydrofuran / Heating View Scheme

1: 98 percent / Br2 / CHCl3 / 1.5 h / Heating 2: 57 percent / NaOMe / CHCl3 3: 32 percent / Na2S2O6*2H2O / methanol; H2O / 18 h / Heating 4: 72 percent / Fe / acetic acid; ethanol / 1 h / Heating View Scheme

1: 94.6 percent / Fe / acetic acid; ethanol / 3.5 h / Heating 2: 40.7 percent / phenyliodine diacetate / tetrahydrofuran / 3 h / 20 °C View Scheme