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A new cascade reaction involving an iminium‐catalyzed intramolecular oxa‐Michael addition followed by an enamine‐catalyzed intermolecular Michael addition is reported herein. This cascade reaction generates enantiopure, highly functionalized tetrahydropyrans and tetrahydrofurans in a one‐pot reaction and in up to 89 % combined yield and up to 99 % ee. This cascade reaction is catalyzed by diaryl prolinol...
A new bifunctional organocatalyst with a novel structural and functional motif has been developed. This bifunctional sulfonamide organocatalyst was used in the conjugate addition of 1,3-dicarbonyl compounds (13) to β-nitrostyrenes (12). Yields up to 91% and enantiomeric excesses up to 79% were obtained in this reaction. This catalyst activates both 13 via its basic moiety and 12 through hydrogen bonding.
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