Cu(I) Based Catalysts Derived From Bidentate Ligands And Studies On The Effect Of Substituents For N-Arylation Of Benzimidazoles And Indoles

A family of Cu(i) complexes [Cu(L1-4)(Cl)(PPh3)] (C1-C4) were synthesized from bidentate ligands L-1-L-4 (where L-1 = (E)-2-(2-benzylidene-1-phenylhydrazinyl)pyridine, L-2 = (E)-N,N-dimethyl-4-((2-phenyl-2-(pyridin-2-yl)hydrazono)methyl)aniline, L-3 = (E)-2-(2-(4-chlorobenzylidene)-1-phenylhydrazinyl)pyridine and L-4 = (E)-2-(2-(4-nitrobenzylidene)-1-phenylhydrazinyl)pyridine) and characterized. The structure of complex C1 was authenticated by single-crystal X-ray diffraction. These complexes were utilised as catalysts for N-arylation of benzimidazoles and indoles. The effect of the substituents in the ligand frame of metal complexes were examined and the probable reaction pathway was scrutinized.