1,1'-bis-(diphenylphosphino)ferrocene; potassium phosphate; [copperl(II)(1,1,1,5,5,5-hexafluoroacetylacetonate)2] monohydrate; palladium diacetate in tetrahydrofuran T=100°C; 1 h; Inert atmosphere;

(i) aq. NaNO2, HCl, (ii) /BRN= 3587244/; Multistep reaction;