copper(l) iodide; triethylamine; tetrakis(triphenylphosphine) palladium(0) T=50°C;

1: K2CO3 / tetrahydrofuran; methanol 2: 96 percent / CuI; triethylamine / Pd(PPh3)4 / 50 °C View Scheme

1.1: LDA / tetrahydrofuran; hexane / 1 h / -78 °C 1.2: 98 percent / tetrahydrofuran; hexane / -78 - 20 °C 2.1: K2CO3 / tetrahydrofuran; methanol 3.1: 96 percent / CuI; triethylamine / Pd(PPh3)4 / 50 °C View Scheme