palladium diacetate; caesium carbonate; 9,9-dimethyl-4,5-bis(diphenyl-phosphino)xanthene in 1,4-dioxane T=80°C; 16 h; Inert atmosphere; chemoselective reaction;

palladium diacetate; caesium carbonate; 1,2-bis-(diphenylphosphino)ethane in 1-methyl-pyrrolidin-2-one T=100°C; 14 h; Inert atmosphere;