1: potassium carbonate / N,N-dimethyl-formamide / 70 °C / Inert atmosphere 2: hydrogen 3: diisopropylamine / dichloromethane / -15 - 20 °C 4: tetrakis(triphenylphosphine) palladium(0); phosphate potassium salt / 1,4-dioxane / 3 h / 100 °C / Inert atmosphere View Scheme

1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 20 °C / Cooling with ice; Inert atmosphere 2: tetrakis(triphenylphosphine) palladium(0) / N,N-dimethyl-formamide / 4 h / 80 °C / Inert atmosphere View Scheme