Asymmetric Organocatalytic Double-Conjugate Addition of Malononitrile to Dienones: Efficient Synthesis of Optically Active Cyclohexanones
摘要:
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.
Quinine-Catalysed Double Michael Addition of Malononitrile to 1,5-Disubstituted Pentadien-3-ones: A Stereoselective Route to Cyclohexanones
作者:Claudia De Fusco、Alessandra Lattanzi
DOI:10.1002/ejoc.201100282
日期:2011.7
The stereoselective synthesis of 4-oxo-2,6-diaryl-cyclohexane-1,1-dicarbonitriles has been developed through doubleMichaeladdition of malononitrile to 1,5-disubstitutedpentadien-3-ones catalysed by quinine. This simple cascade process affords cyclohexanones in moderate-to-good yields, excellent diastereoselectivity and up to 86 % ee. The isolation of the monoaddition product helps to shed light
4-氧代-2,6-二芳基-环己烷-1,1-二腈的立体选择性合成是通过丙二腈与奎宁催化的1,5-二取代戊二烯-3-酮的双迈克尔加成而开发的。这种简单的级联过程以中等至良好的产率、出色的非对映选择性和高达 86% 的 ee 提供了环己酮。单加成产物的分离有助于阐明两步法的立体化学结果。
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.