Asymmetric Synthesis of Axially Chiral Biaryl Diphosphine Ligands by Rhodium-Catalyzed Enantioselective Intramolecular Double [2 + 2 + 2] Cycloaddition

Abstract

The concise synthesis of axially chiral biaryl diphosphine ligands by the rhodium-catalyzed intramolecular [2 + 2 + 2] cycloaddition of hexayne diphosphine oxides has been achieved. These new chiral diphosphine ligands could be employed as a ligand for the rhodium-catalyzed asymmetric catalyses.