1: 96 percent / imidazole / dimethylformamide 2: 93 percent / Et2NH, Pd(PPh3)4, CuI / 15 h / Ambient temperature 3: 92 percent / PPh3, CBr4 / CH2Cl2 / -40 - 0 °C 4: 90 percent / 100 °C 5: LDA / tetrahydrofuran / -78 deg C, 8 h; -20 deg C, 1 h; room temp., 1 h 6: 60 percent / H2 / Lindlar catalyst / CH2Cl2 / 22 h / Ambient temperature 7: 73 percent / n-Bu4NF / tetrahydrofuran / 5 h / Ambient temperature View Scheme