Method for preparing chiral ferrocene diphosphine ligand

摘要

A method for synthesizing (R)-(−)-1-((S)-2-diphosphino ferrocene)-ethyl-diphosphine by: 1) adding vinylferrocene, a chiral catalyst, and toluene to a first drying reactor; adding a phosphorus-hydrogen compound to the first drying reactor and allowing reactants in the first drying reactor to react; cooling the first drying reactor; adding water dropwise to the first drying reactor; extracting, drying, and recrystallizing a product to yield (R)-1-ferrocenylethyl-diphosphine; 2) adding the (R)-1-ferrocenylethyl-diphosphine and ether to a second drying reactor; adding a hexane solution including diethylzinc to the second drying reactor and allowing reactants in the second drying reactor to react; adding a phosphorus-chlorine compound dropwise to the second drying reactor, and heating and refluxing the reaction mixture in the second drying reactor; adding water to quench the reaction mixture in the second drying reactor; and extracting, drying, and recrystallizing the reaction mixture.