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Biomimetic asymmetric hydrogenation.

A Börner1

  • 1Institut für Organische Katalyseforschung an der Universität Rostock e.V. Rostock, Germany. armin.boerner@ifok.uni-rostock.de

Chirality
|December 18, 2001
PubMed
Summary

Chiral rhodium catalysts with hydroxy groups mimic enzymes by using hydrogen bonding to improve asymmetric hydrogenation. This biomimetic approach enhances enantioselectivity, achieving up to 99% ee, even in water.

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Area of Science:

  • Organometallic Chemistry
  • Asymmetric Catalysis
  • Biomimetic Chemistry

Background:

  • Enzymes and organometallic catalysts create chiral centers via different mechanisms.
  • Enzymes often use stereodiscriminating hydrogen bonding, while catalysts rely on repulsive interactions.
  • Investigating hydrogen bonding's role in rhodium diphosphine-catalyzed asymmetric hydrogenation is crucial.

Purpose of the Study:

  • To explore if hydrogen bonding in catalyst-substrate assemblies benefits rhodium diphosphine-catalyzed asymmetric hydrogenation.
  • To incorporate 'biomimetically acting' hydroxy groups into chiral ligands.
  • To analyze the influence of these secondary interactions on reaction rate and enantioselectivity.

Main Methods:

  • Synthesis of model rhodium diphosphine complexes with hydroxy-functionalized ligands.
  • Investigation of catalyst-substrate interactions using various analytical methods.
  • Performance evaluation of asymmetric hydrogenation reactions under different conditions, including aqueous solvent.

Main Results:

  • Identified three key secondary interactions: HO/Rh, HO/HO within the ligand, and ligand HO/substrate hydrogen bonding.
  • Hydroxy groups significantly influenced the rate and enantioselectivity of the catalytic reaction.
  • Achieved high enantioselectivities, up to 99% ee, in the hydrogenation products, even when using water as a solvent.

Conclusions:

  • Hydrogen bonding, inspired by enzymatic mechanisms, can effectively enhance enantioselectivity in organometallic catalysis.
  • The strategic incorporation of hydroxy groups in chiral ligands offers a biomimetic strategy for improving asymmetric hydrogenation.
  • This approach demonstrates the potential for developing efficient and selective catalytic systems, even in environmentally benign solvents like water.

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