Journal
TETRAHEDRON-ASYMMETRY
Volume 17, Issue 6, Pages 908-915Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetasy.2006.03.007
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The synthesis of alpha-methylene-6-valerolactones 7, 13, and 19 with enantiomeric excesses of 90-97% was achieved by the asymmetric Michael reaction of chiral imines 3, 9, and 15 with the acrylate 1. Reduction of the carbonyl group of the resulting adducts followed by lactonization and HWE reaction with formaldehyde yielded the lactones as mixtures of diastereoisomers. (c) 2006 Elsevier Ltd. All rights reserved.
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