Secondary-Amine-Catalyzed Asymmetric Michael Addition of N-tert-Butoxycarbonyl-Protected Oxindoles to Maleimides

[摘要]：A secondary-amine-catalyzed asymmetric Michael addition of 3-substituted N-(tert-butoxycarbonyl)oxindoles to maleimides with activation by a Bronsted base gives the corresponding products in high yields (86-98%), excellent diastereomeric ratios (dr > 99: 1), and high enantiomeric excesses (86-91% ee).

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