Bifunctional thiourea-based organocatalysts facilitate an enantioselective desymmetrization and Lossen rearrangement cascade reaction of -sulfoxy -succinimides, resulting in the synthesis of cyclic β-amino acid derivatives. This catalytic system was optimized for bicyclic and tricyclic succinimide substrates affording yields from 61-91% and up to 96:4 er. This reaction proceeds via the group selective addition of the primary alcohol nucleophile to an enantiotopic carbonyl group with sequential rearrangement of the intermediate -sulfonyl hydroxamate ester.
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