Journal
TETRAHEDRON LETTERS
Volume 47, Issue 13, Pages 2141-2145Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2006.01.122
Keywords
[3+2] cycloadditions; enantioselective organocatalysis; phosphines; 3-pyrrolines
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The first systematic screening of chiral phosphines in the cycloaddition reaction between 2,3-butadienoates and arylimines has led to the identification of fairly efficient catalysts. 2-Aryl-3-pyrrolines have been obtained with enantiomeric excesses up to 64%. In one instance, the enantiomeric excess could be increased to 91% ee by combining the enantioselective cyclization reaction with a crystallization step. (c) 2006 Elsevier Ltd. All rights reserved.
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