Synthesis of ferrocene-based phosphine ligands via Cu-catalyzed reductive coupling of ferrocenyl ketone-derived tosylhydrazones and H-phosphorus oxides

Ferrocene-based phosphine oxides with various substituents at phosphorous atoms were synthesized by Cu-catalyzed reductive coupling of ferrocenyl ketone-derived tosylhydrazones and H-phosphorus oxides. Followed by the reduction of ferrocene-based phosphine oxides, 1-substituted ferrocene-based phosphine ligand 7 and 1,1′-disubstituted ferrocene-based phosphine ligand 9 were obtained. Josiphos type ligand 8 were produced after ortho-lithiation of 7 and trapping with chlorodiphenyl phosphine or chlorodicyclohexylphosphine.

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