1.1: sulfuric acid; water / methanol / 1 h / Reflux; Inert atmosphere 1.2: 3 h / Reflux; Inert atmosphere 2.1: caesium carbonate; triphenylphosphine; palladium dichloride / tetrahydrofuran; water / 22 h / 85 °C / sealed tube; Inert atmosphere 3.1: bis(1,5-cyclooctadiene)-rhodium(I) tetrafluoroborate; 6-diphenylphosphinomethyl-3-methyl-2-aminopyridine / toluene / 1 h / 150 °C / Inert atmosphere View Scheme