The dienes 1–4 were employed in an asymmetric DA reaction with a range of substituted nitrostyrenes. The desired compounds were obtained in moderate to good yields, where a clear trend of diastereoselectivity was observed ( Scheme 4 ).
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Synthesis and Application of Chiral 2-Amido and 1-Phenyl-2-amido Dienes in Diels-Alder Reactions to Access Chiral Cyclic Ketones.
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