A one-pot, two-stage synthesis of diaryl sulfonamides using sequential iron and copper
catalysis is developed. Regioselective para-iodination of activated arenes by the super Lewis acid, iron triflimide and N-iodosuccinimide (NIS), is followed by a copper(I)-catalyzed N-arylation reaction. The process is found to be applicable for the coupling of a range
of anisoles, anilines and acetanilides with primary sulfonamides and is used for the
one-pot synthesis of biologically important compounds.
Key words
sulfonamides - iron catalysis - copper catalysis - aryl substitution