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José M. Andrés, Rubén Manzano and Rafael Pedrosa Novel Bifunctional Chiral Urea and Thiourea Derivatives as Organocatalysts: Enantioselective Nitro-Michael Reaction of Malonates and Diketones Chemistry - A European Journal 14

Version of Record online: 22 APR 2008 | DOI: 10.1002/chem.200800633

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Novel chiral ureas and thioureas derived form natural α-amino acids have been prepared and tested as bifunctional organocatalysts in enantioselective nitro-Michael additions (see scheme). The reactions occurred with excellent chemical yields and up to 99 % ee.

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