Cu(I) based catalysts derived from bidentate ligands and studies on 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 L1-L4 (where L1= (E)-2-(2-benzylidene-1-phenylhydrazinyl)pyridine, L2= (E)-N,N-dimethyl-4-((2-phenyl-2-(pyridin-2-yl)hydrazono)methyl)aniline, L3= (E)-2-(2-(4-chlorobenzylidene)-1-phenylhydrazinyl)pyridine and L4= (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. Effect of the substituents in the ligand frame of metal complexes were examined and probable reaction pathway was scrutinized.