Regio‐ and Enantioselective Synthesis of 1,2‐Diamines by Formal Hydroamination of Enamines: Scope, Mechanism, and Asymmetric Synthesis of Orthogonally Protected Bis‐Piperazines as a Privileged Scaffold
Chiral 1,2-diamines are an important structural motif in organic synthesis, and can be prepared by an efficient Cu−H catalyzed asymmetric hydroamination of enamines. The applicability of the hydroamination protocol is demonstrated by an asymmetric synthesis of a MC-4 receptor antagonist. The origin of the excellent enantioselectivity is investigated using DFT calculations.