1: With potassium acetate in 1,4-dioxane 0.25 h; 2: With tri-cyclo-hexyl-phosphine; tris-(dibenzylideneacetone)dipalladium(0) in 1,4-dioxane T=80 - 85°C; 3.25 h;

potassium acetate; dichloro(1,1'-bis(diphenylphosphanyl)ferrocene)palladium(II) dichloromethane adduct; 1,1'-bis(diphenylphosphino)ferrocene in 1,4-dioxane T=120°C; 5 h; Inert atmosphere;