A Cu-catalyzed enantioselective hydroamination of α,?-unsaturated carbonyl compounds for the synthesis of ? -amino acid derivatives was achieved through ligand-controlled reversal of the hydrocupration regioselectivity. While the hydrocupration of α,?-unsaturated carbonyl compounds to form α-cuprated species has been extensively investigated, we report herein that, in the presence of an appropriate ancillary chiral ligand, the alternative regiochemistry can be observed for cinnamic acid derivatives, leading to delivery of the copper to the ?-position. This copper can react with an electrophilic aminating reagent, 1,2-benzisoxazole, to provide enantioenriched ?-amino acid derivatives, which are important building blocks for the synthesis of natural products and bioactive small molecules.
“Enantioselective Synthesis of β-Amino Acid Derivatives Enabled by Ligand-Controlled Reversal of Hydrocupration Regiochemistry”, Angew. Chem. Int. Ed., 2020, 59, 20841-20845.