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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Towards preparative-scale, biocatalytic alkene reductions.

Despina J Bougioukou1, Adam Z Walton, Jon D Stewart

  • 1Department of Chemistry, University of Florida, 126 Sisler Hall, Gainesville, FL 32611, USA.

Chemical Communications (Cambridge, England)
|October 6, 2010
PubMed
Summary

Simple strategies using alkene reductase enzymes enable gram-scale production of (R)- and (S)-citronellal. This accessible methodology integrates alkene reductases into routine synthetic chemistry, benefiting non-specialist labs.

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Area of Science:

  • Biocatalysis and Synthetic Chemistry
  • Enzyme Engineering

Background:

  • Citronellal is a valuable chiral building block in organic synthesis.
  • Efficient and scalable methods for producing enantiomerically pure citronellal are in demand.
  • Current synthetic routes may involve multiple steps or specialized reagents.

Purpose of the Study:

  • To develop simple and accessible strategies for the gram-scale synthesis of both (R)- and (S)-citronellal.
  • To demonstrate the utility of alkene reductase enzymes in producing chiral aldehydes.
  • To facilitate the integration of biocatalytic methods into standard laboratory practices.

Main Methods:

  • Utilizing specific alkene reductase enzymes for the stereoselective reduction of prochiral substrates.
  • Optimizing reaction conditions for high yield and enantiomeric purity.
  • Implementing simple work-up procedures for easy isolation of the products.

Main Results:

  • Successful production of gram-scale quantities of both (R)- and (S)-citronellal.
  • High enantiomeric excess (ee) achieved for both enantiomers.
  • Demonstration of the robustness and scalability of the enzymatic approach.

Conclusions:

  • Alkene reductase enzymes provide a straightforward and effective route to enantiopure citronellal.
  • The developed methodology is accessible to laboratories without specialized biocatalysis expertise.
  • This work expands the synthetic toolbox by incorporating alkene reductases for routine chiral synthesis.