Journal
TETRAHEDRON-ASYMMETRY
Volume 20, Issue 9, Pages 1046-1051Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetasy.2009.02.054
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A series of novel chiral multifunctionalized 4H-pyran derivatives were easily accessed via the one-pot asymmetric Michael addition-cyclization reaction between malononitrile and beta,gamma-unsaturated alpha-keto esters catalyzed by chiral bifunctional thiourea-tertiary amine catalysts. With the optimized reaction conditions, the desired products were obtained with 50-68% yields and 72-88% ees. (c) 2009 Elsevier Ltd. All rights reserved.
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