Abstract
An asymmetric Mannich addition of β-ketoesters to indolenines that were generated in situ from 3-indolinone-2-carboxylates by DDQ has been developed using a catalytic amount of chiral BINOL-phosphoric acid. The corresponding chiral 3-indolinone-2-carboxylate derivatives were obtained in good yields with excellent ee (up to 99%). This is the first report on the enantioselective addition of β-ketoesters to indolenines using a chiral Brønsted acid.
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