1: copper(I) bromide; N,N-dicyclohexylamine / 1,4-dioxane / 3 h / 180 °C / |Microwave irradiation 2: 2,3-dicyano-5,6-dichloro-p-benzoquinone / benzene / 5 h / 110 °C / |Inert atmosphere View Scheme

potassium carbonate in N,N-dimethyl-formamide 1 h; Heating;