Design and Synthesis of [2.2]Paracyclophane-based Oxazole-Pyrimidine
Ligands and Application in Nickel-Catalyzed 1,2-Reduction of
α,β-Unsaturated Ketones
Abstract
The [2.2]paracyclophane-derived oxazole-pyrimidine ligands with
planar chirality (PYMCOX) were designed, synthesized and successfully
applied in nickel-catalyzed asymmetric 1,2-reduction of α,β-unsaturated
ketones, affording the chiral allylic alcohols with up to 99% yield and
99% ee. Meanwhile, this reduction reaction could be conducted on
gram-scale without loss of activity and enantioselectivity, and the
chiral ligand could be conveniently recovered with high yield.