Catalytic Enantioselective Amide Allylation of Isatins and Its Application in the Synthesis of 2-Oxindole Derivatives Spiro-Fused to the α-Methylene-γ-Butyrolactone Functionality
enantioselectivities (up to >99 %, 99 % ee) of variouslysubstituted homoallylic alcohols. Several mechanistic investigations demonstrated that the substrate–reagent hydrogen‐bond interaction plays a critical role in the formation of the key transition states to result in enhanced catalytic reaction. The success of this approach allowed convenientaccess to chiral 2‐oxindoles spiro‐fused to the α‐methylene‐γ‐butyrolactone