1.1: methanesulfonic acid / 1 h / 50 °C 2.1: pyridine / dichloromethane / 0.17 h / 20 °C 2.2: -78 - 20 °C 3.1: copper(l) iodide; bis-triphenylphosphine-palladium(II) chloride; triethylamine / N,N-dimethyl-formamide / 2 h / 20 °C / Inert atmosphere 4.1: methanol; potassium carbonate / tetrahydrofuran / 1 h / 20 °C 5.1: platinum (II) chloride / toluene / 80 °C 6.1: boron tribromide View Scheme