1.1: copper(l) iodide; bis-triphenylphosphine-palladium(II) chloride; triethylamine / 20 °C / Inert atmosphere 2.1: n-butyllithium; N,N,N',N,-tetramethylethylenediamine / tetrahydrofuran / 0.67 h / -78 °C / Inert atmosphere 2.2: 3 h / -78 - 25 °C / Inert atmosphere 3.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.5 h / 26 °C / Inert atmosphere View Scheme