Abstract
An efficient asymmetric aldol condensation of ketones with isatins has been developed using an l-proline-derived bifunctional organocatalyst. This strategy allows the enantioselective synthesis of a variety of 3-alkyl-3-hydroxyindolin-2-ones with a stereogenic quaternary carbon center in excellent yields with good to excellent enantiomeric excess. The method has been applied to the enatioselective synthesis of ( S)-convolutamydine A successfully.
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