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DOI: 10.1055/s-0030-1259000
Enantioselective Nitroaldol Reaction of α-Keto Esters Catalyzed by a Copper(II)-Bisoxazolidine Complex
Publication History
Publication Date:
12 October 2010 (online)

Abstract
A wide range of aliphatic and aromatic α-keto esters has been transformed to α-hydroxy-β-nitro esters via the Cu(II)-bisoxazolidine-catalyzed Henry reaction. In the presence of 10 mol% of the chiral catalyst, nitroaldol products were obtained in up to 95% yield and 76% ee.
Key words
asymmetric catalysis - nitroaldol reaction - chiral alcohols - copper - oxazolidine
- Supporting Information for this article is available online:
- Supporting Information
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20070265255A1 patent pending. This ligand is commercially
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References and Notes
A control experiment showed that the nitroaldol reaction proceeds very slowly in the presence of AgClO4 and only 12% of racemic 2 were obtained after 24 h. We therefore believe that the in situ formation of Cu(ClO4)2 from AgClO4 and CuCl2, which is visible by the precipitation of AgCl, is quantitative.