1: 1.) LDA, 2.) triethylamine / 1.) THF, hexane, -78 deg C, 10 min, 2.) THF, hexane, from -78 deg C to RT 2: 84 percent / Pd(PFu3)2Cl2 / toluene / 72 h / Heating; other palladium catalysts; other <(trimethylsilyl)oxy>hexatrienes View Scheme

Multi-step reaction with 2 steps 1: 70 percent / NEt3 / 1,2-dimethoxy-ethane / 12 h / Ambient temperature2: 74 percent / LiBr / Pd(PPh3)4 / tetrahydrofuran / 36 h / 80 °C