copper(l) iodide; tetrakis(triphenylphosphine) palladium(0); triethylamine in N,N-dimethyl-formamide T=20°C; Sonogashira coupling; 15 h;

1: With copper(l) iodide; N-ethyl-N,N-diisopropylamine; tetrakis(triphenylphosphine) palladium(0) in N,N-dimethyl-formamide 2: With copper(l) iodide; triethylamine 8 h; Heating; Further stages.;