Sulfonic acid containing cation-exchanger resin “INDION-770” and copper(I) salts: a novel reusable catalyst for N-arylation of NH-heterocycles with haloarenes

Industrial grade sulfonic acid based cation-exchanger resin “INDION-770” in combination with Cu(I) salts is demonstrated to be a versatile heterogeneous catalytic system for direct N-arylation of NH-heterocycles with various haloarenes to give the corresponding N-arylheterocycles in good to excellent yields.