期刊
TETRAHEDRON-ASYMMETRY
卷 20, 期 23, 页码 2651-2654出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetasy.2009.11.007
关键词
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资金
- Spanish Ministerio de Educacion y Ciencia [CTQ2007-62771/BQU, CSD2007-00006]
- Generalitat Valenciana [Prometeo/2009/039]
- University of Alicante
Dimeric anthracenyldimethyl-derived Cinchona ammonium salts are used as chiral organocatalysts in 1-10 mol% for the enantioselective conjugate addition of 2-alkoxycarbonyl-1-indanones to beta-unsubstituted Michael acceptors. The corresponding adducts bearing a new all-carbon quaternary center were usually obtained in high yield and with up to 94% ee when using ammonium salts derived from quinidine and its pseudoenantiomer quinine as organocatalysts. These catalysts can be almost recovered quantitatively by precipitation in ether and reused. (C) 2009 Elsevier Ltd. All rights reserved.
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