From the Carbon Center to the Silicon Center:Advances of Chiral Spiro Diphosphine Ligands
Chiral spiro ligands and catalysts have been recognized as a class of dominant chiral ligands and catalysts.The research on chiral spiro ligands has promoted the development of asymmetric catalysis.According to the difference of spiro atoms in the spiro,the spiro is divided into carbon center spiro skeleton and silicon center spiro skeleton.The synthesis and application of chiral spiro diphosphine ligands based on carbon center with spiro[4.4]nonane skeleton,spirobiindane skeleton,spirononadiene skeleton,spirobichroman skeleton and silicon center are discussed respectively.It provides an important reference for developing new asymmetric catalytic systems in the future.
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