A new class of asymmetric phase-transfer catalysts derived from Cinchona alkaloids - Application in the enantioselective synthesis of alpha-amino acids
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作者:
Lygo, B
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机构:Department of Chemistry, University of Salford, Salford
Lygo, B
Wainwright, PG
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机构:Department of Chemistry, University of Salford, Salford
Wainwright, PG
机构:
[1] Department of Chemistry, University of Salford, Salford
A new class of Cinchona alkaloid-derived quaternary ammonium phase-transfer catalysts bearing a N-anthracenylmethyl function are presented. These catalysts show high stereocontrol in the asymmetric alkylation of a benzophenone-derived glycine-imine, and application of this process to the enantioselective synthesis of a range of alpha-amino acid esters (e.e. 67-94%) is investigated. (C) 1997 Elsevier Science Ltd.