copper(l) iodide; triethylamine; bis-triphenylphosphine-palladium(II) chloride Sonogashira cross-coupling; cooling; Title compound not separated from byproducts;

1.1: CuI; triethylamine / Pd(PPh3)2Cl2 / cooling 1.2: potassium carbonate / methanol; CH2Cl2 / 20 °C 1.3: triethylamine; CuI / Pd(PPh3)2Cl2 2.1: n-BuLi / tetrahydrofuran; hexane / -78.15 - -40.15 °C 2.2: 91 percent / I2 / tetrahydrofuran; hexane / -78.15 - 19.85 °C 3.1: 81 percent / potassium carbonate / methanol; CH2Cl2 / 20 °C View Scheme