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Catalytic enantioselective synthesis of quaternary all-carbon stereogenic centers. Preparation of alpha,alpha'-disubstituted beta,gamma-unsaturated esters through Cu-catalyzed asymmetric allylic alkylations
Authors:Murphy Kerry E  Hoveyda Amir H
Institution:Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, USA.
Abstract:reaction: see text] Peptide-based chiral ligands, readily prepared from commercially available materials, are used to promote Cu-catalyzed asymmetric allylic alkylations of alpha,beta-unsaturated esters bearing a gamma-phosphate with various alkylzinc reagents. These transformations lead to the formation of alpha,alpha'-dialkyl-beta,gamma-unsaturated esters in high yields as well as high regio- (re) and enantioselectivities (ee).
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