1.1: tributyl-amine / bis-triphenylphosphine-palladium(II) chloride / N,N-dimethyl-formamide / 18.67 h / 95 - 100 °C / Inert atmosphere 1.2: 3.67 h / 40 - 95 °C / Inert atmosphere 2.1: caesium carbonate / acetonitrile / 60 °C / Inert atmosphere 3.1: acetyl chloride; methanol / 4 h / 20 °C / Inert atmosphere; Cooling with ice 3.2: 0.5 h / 20 °C View Scheme