1: triethylamine; copper(l) iodide; triphenylphosphine; bis-triphenylphosphine-palladium(II) chloride / tetrahydrofuran / 12 h / 80 °C / |Inert atmosphere 2: chloroform / 2 h / |UV-irradiation View Scheme

1: triethylamine; copper(l) iodide; triphenylphosphine; bis-triphenylphosphine-palladium(II) chloride / tetrahydrofuran / 12 h / 80 °C / |Inert atmosphere 2: potassium hydroxide / toluene / 12 h / 110 °C / |Inert atmosphere; |UV-irradiation View Scheme

potassium hydroxide in toluene T=110°C; 5 h; Inert atmosphereUV-irradiation;

in ethyl acetate 2 h; UV-irradiation;