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No more double trouble: The competing double‐addition pathway was suppressed when chiral scandium(III) and indium(III) complexes were used to catalyze the addition of indoles and other π nucleophiles to N‐alkylated and unprotected isatins (see picture). The resulting biologically relevant substituted 3‐hydroxy‐2‐oxindoles were obtained in high yield with high enantioselectivity. Tf=trifluoromethanesulfonyl.
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