Copper‐catalyzed Regioselective Hydroaminations of Allylic Sulfones With Aromatic Amines

The highly regioselective copper‐catalyzed hydroaminations of terminal or γ‐substituted allylic sulfones with aromatic amines is described. The combination of an N ‐heterocyclic carbene‐copper complex and KO t ‐Bu plays an important role in promoting selective amination under mild reaction conditions. This catalytic reaction tolerates a wide range of functional groups and enables the efficient syntheses of new and versatile functionalized β‐amino sulfones in high yields (up to 98%) with >98% regioselectivity.