manganese(IV) oxide in chloroform 9 h; Ambient temperature;

4-(N,N-dimethlyamino)pyridine; 1,1'-bis-(diphenylphosphino)ferrocene; N-ethyl-N,N-diisopropylamine; palladium diacetate in 1,4-dioxane T=180°C; 0.5 h; microwave irradiation;