An Enantioselective Synthesis of Substituted Cyclohexanone Derivatives with an All-Carbon Quaternary Stereocenter by Using an Organocatalytic Asymmetric Domino Double Michael Addition
作者:Chi-Han Chen、Chi-Ting Ko、Ganapuram Madhusudhan Reddy、Chia-Jui Lee、Wenwei Lin
DOI:10.1002/ejoc.201500524
日期:2015.8
A cinchona alkaloid-catalyzed enantioselective method has been developed for the synthesis of densely functionalized cyclohexanonederivatives with excellent diastereoselectivities and good enantioselectivities [diastereomeric ratio (dr) >95:5 and an enantiomeric excess (ee) value up to 86 %]. The products have an all-carbonquaternary center that contains both a cyano and ester group flanked by two
Asymmetric Organocatalytic Synthesis of Highly Substituted Cyclohexenols by Domino Double-Michael Reactions of 1-Hydroxy-1,4-dien-3-ones and 2-Alkylidenemalononitriles
作者:Yeong-Jiunn Jang、Yu-Shan Chen、Chia-Jui Lee、Chi-Han Chen、Ganapuram Madhusudhan Reddy、Chi-Ting Ko、Wenwei Lin
DOI:10.1002/ejoc.201403677
日期:2015.3
A facile asymmetric synthetic protocol to afford 2,6-disubstituted 4-hydroxy-3-oxocyclohex-3-ene-1,1-dicarbonitriles has been developed through the dominodouble-Michael addition of 1,5-disubstituted 1-hydroxy-1,4-dien-3-ones to 2-alkylidenemalononitriles using quinine as the catalyst. This simple organocatalyticdomino process provides access to various highly functionalized chiral 4-hydroxy-3-oxocyclohex-3-enes