Dual Heterogeneous Catalysis for a Regioselective Three-Component Synthesis of Bi- and Tri(hetero)arylpyridines

We have designed a new, user-friendly oxidative dual heterogeneous catalytic system capable of promoting polysubstituted pyridines as unique products from simple activated Michael acceptors, 1,3-dicarbonyls and ammonium acetate. This metal-free environmentally-respectful and totally regioselective domino reaction proved to be a great strategy to access bi- and triaryl-type pyridines as well as challenging bi- and triheteroaryl-type pyridines in a single operation.