1: [HMim][p-TSA] / 130 °C 2: pyridine / dichloromethane / 20 °C / |Cooling with ice; |Inert atmosphere 3: triethylamine; formic acid; palladium diacetate; 1,1'-bis-(diphenylphosphino)ferrocene / N,N-dimethyl-formamide / 0.33 h / 80 °C / |Inert atmosphere 4: pyridine hydrochloride / 2 h / |Inert atmosphere; |Reflux View Scheme

1: [HMim][p-TSA] / 130 °C 2: potassium tert-butylate / N,N-dimethyl-formamide / 1 h / 80 °C View Scheme