Abstract
A series of new squaramide-based organocatalysts were synthesized from commercially available 3,4-dimethoxycyclobut-3-ene-1,2-dione in two steps. A 2.5 mol-% loading of the organocatalyst successfully catalyzed the asymmetric allylation of isatins with allyltributyltin to give the corresponding 3-allyl-3-hydroxyoxindoles in high yields and enantioselectivities (up to 98 % ee).
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