In the presence of an L-tert-leucine-derived urea ammonium salt as phase-transfer catalyst, a highly enantioselective alkylation of 5H-oxazol-4-ones with various benzyl bromides and allylic bromides has been developed to furnish catalytic asymmetric synthesis of biologically important dialkylated a-hydroxy carboxylic acids with a broad scope. This is the first example of an L-amino acid-derived urea ammonium salt being used as a phase-transfer catalyst with excellent catalytic efficiency.
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INSA, CNRS UMR COBRA, F-76131 Mont St Aignan, France
Univ Rouen, FR 3038, IRCOF, F-76131 Mont St Aignan, FranceINSA, CNRS UMR COBRA, F-76131 Mont St Aignan, France
Mahe, Olivier
Dez, Isabelle
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ENSICaen Univ Caen, CNRS, FR3038,Lab Chim Mol & Thioorgan, Caen, FranceINSA, CNRS UMR COBRA, F-76131 Mont St Aignan, France
Dez, Isabelle
Levacher, Vincent
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INSA, CNRS UMR COBRA, F-76131 Mont St Aignan, France
Univ Rouen, FR 3038, IRCOF, F-76131 Mont St Aignan, FranceINSA, CNRS UMR COBRA, F-76131 Mont St Aignan, France
Levacher, Vincent
Briere, Jean-Francois
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INSA, CNRS UMR COBRA, F-76131 Mont St Aignan, France
Univ Rouen, FR 3038, IRCOF, F-76131 Mont St Aignan, FranceINSA, CNRS UMR COBRA, F-76131 Mont St Aignan, France