ChemInform Abstract: Copper-Catalyzed Synthesis of 1,3,4-Trisubstituted and 1,3,4,5-Tetrasubstituted Pyrazoles via [3 + 2] Cycloadditions of Hydrazones and Nitroolefins.
The procedure tolerates a broad substrate scope for both reactants to afford the pharmaceutically interesting pyrazole units in a regioselective manner.