N‑Heterocyclic Carbene C,S Palladium(II) π‑Allyl Complexes: Synthesis, Characterization, and Catalytic Application In Allylic Amination Reactions

A series
of five-membered N-heterocyclic carbene C,S palladium­(II)
π-allyl complexes were
successfully developed and characterized. Structural analyses of these
complexes revealed that the organopalladium chelates adopt a skew-envelope
conformation with a trans disposition of the substituents
on the metal chelate rings. Utilizing these C,S palladium­(II) π-allyl
complexes as catalysts, a catalytic system for the allylic amination
reaction has been developed. A series of C–N bond formations
between amines and unsymmetrically substituted allylic carbonates
could be catalyzed efficiently by complex (±)-9 in
a regioselective manner.