Chiral Bifunctional Ferrocenylphosphine‐Catalyzed Enantioselective Allylic Alkylation of Morita−Baylis−Hillman Carbonates with Pyrazolin‐5‐ones

A chiral bifunctional ferrocenylphosphine catalyzed asymmetric allylic alkylation of Morita−Baylis−Hillman (MBH) carbonates with pyrazolin‐5‐ones was developed. The reaction afforded the desired pyrazolone derivatives in moderate to good yields (up to 80%), and with high enantioselectivities (up to 98% ee). Enantioselective ironing: A chiral bifunctional ferrocenylphosphine‐catalyzed asymmetric allylic alkylation of Morita−Baylis−Hillman (MBH) carbonates with pyrazolin‐5‐ones was developed. It afforded the desired pyrazolone derivatives in satisfactory yields with high enantioselectivities.