Asymmetric Organocatalytic Double-Conjugate Addition of Malononitrile to Dienones: Efficient Synthesis of Optically Active Cyclohexanones
作者:Xue-ming Li、Bo Wang、Jun-min Zhang、Ming Yan
DOI:10.1021/ol102570b
日期:2011.2.4
9-Amino-9-deoxyepiquinine efficiently catalyzed the double-conjugate addition of malononitrile to dienones. A number of 1,1,2,6-tetrasubstituted cyclohexanones were prepared in good yields, diastereoselectivities, and excellent enantioselectivities.
Organocascade Reactions of Enones Catalyzed by a Chiral Primary Amine
addition sequence by chiral primary amine catalysis, which offers a powerful alternative in the design of synthetically useful organocascade reactions (see scheme, EWG=electron‐withdrawing group). This method complements the Diels–Alder reaction for the one‐step synthesis of complex cyclohexane scaffolds with excellent optical purity.