Stereodivergent Synthesis of Enantioenriched α‑Deuterated α‑Amino Acids via Cascade Cu(I)-Catalyzed H–D Exchange and Dual Cu- and Ir-Catalyzed Allylation

A one-pot Cu-mediated H–D exchange with inexpensive heavy water as the deuterium source, followed by Cu- and Ir-catalyzed stereodivergent allylic alkylation, has been developed, providing efficient access to enantioenriched α-deuterium-labeled α-amino acids from readily available glycine imine esters in a high yield with excellent stereoselectivity. High deuterium enrichment, exquisite regioselectivity, precise stereoselectivity control, and operationally convenient procedures make this protocol appealing for the preparation of highly synthetically useful α-deuterated α-amino acids.