copper(l) iodide; 1,10-phenanthroline; caesium carbonate; ethanethiolic acid in 1,4-dioxane T=20 - 100°C; 13.25 h; Inert atmosphere;

n-butyllithium; diisopropylamine 1.) THF, hexane, - 78 deg C, 15 min, 2.) THF, - 78 deg C, 30 min; 20 deg C, 3 h; Yield given. Multistep reaction;