Reuse of chiral cationic Pd–phosphinooxazolidine catalysts in ionic liquids: highly efficient catalytic asymmetric Diels–Alder reactions

Abstract

Chiral cationic palladium–phosphinooxazolidine catalysts in ionic liquid afforded excellent enantioselectivity in Diels–Alder reactions and the catalyst was easily recycled eight times without any significant decrease in chemical yields or enantioselectivity (89–99%, 88–99% ee).