1: 71 percent / PPh3, Et3N, PdCl2, CuI / dimethylformamide / 2 h / 80 °C 2: H2 / Raney Ni / methanol / 20 °C 3: K2CO3 / acetone / 70 °C 4: 82 percent / TsOH*H2O / toluene / Heating 5: 5percent aq. NaOH / methanol / 50 °C View Scheme