Diastereo- and Enantioselective [3+2] Cycloaddition Reaction of Morita-Baylis-Hillman Carbonates of Isatins with N-Phenylmaleimide Catalyzed by Me-DuPhos

A Me-DuPhos-catalyzed efficient asymmetric [3 + 2] cycloaddition reaction between Morita-Baylis-Hillman carbonates of isatins and N-phenylmaleimide has been developed. This reaction constructs three chiral centers in one step to afford spirocyclopentaneoxindoles in good yields (up to 84%) with excellent diastereo- and enantioselectivies (up to 99% ee).