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Issue 10, 2009
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Enantioselective catalysts for the Henry reaction: fine-tuning the catalytic components

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Abstract

Catalysts for the asymmetric Henry reaction involving 1,6-bis(3-ethoxy-2-hydroxyphenyl)-(3S,4S)-(−)-diphenyl-2,5-diazahexane (H22) and copper salts have been investigated. Conditions for the conversion of 4-nitrobenzaldehyde to 2-nitro-1-(4-nitrophenyl)ethanol by reaction with nitromethane have been optimized (5 mol% H22, 10 mol% CuI, THF, 295 K and 2 hours or 273 K and 12 hours) resulting in 99% yield and 90–92% ee. These catalytic conditions are effective for other aromatic aldehydes containing electron-withdrawing substituents, and for pyridine carbaldehydes; representative aliphatic aldehydes were converted to the respective β-hydroxynitro derivatives with good enantioselectivities, and in moderate yields. These catalytic conditions were found to be ineffective for simple aromatic aldehydes or those containing electron-releasing substituents.

Graphical abstract: Enantioselective catalysts for the Henry reaction: fine-tuning the catalytic components

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Publication details

The article was received on 08 Jun 2009, accepted on 25 Jun 2009 and first published on 17 Aug 2009


Article type: Paper
DOI: 10.1039/B9NJ00243J
New J. Chem., 2009,33, 2166-2173

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    Enantioselective catalysts for the Henry reaction: fine-tuning the catalytic components

    E. C. Constable, G. Zhang, C. E. Housecroft, M. Neuburger, S. Schaffner, Wolf-D. Woggon and J. A. Zampese, New J. Chem., 2009, 33, 2166
    DOI: 10.1039/B9NJ00243J

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