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[Thermodynamically controlled deracemization utilizing inclusion complexation].

Hiroto Kaku1

  • 1Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Japan. kaku@ph.bunri-u.ac.jp

Yakugaku Zasshi : Journal of the Pharmaceutical Society of Japan
|October 2, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces a novel solid-state method for deracemizing alpha-monosubstituted ketones using host-guest inclusion complexation. The technique yields optically active ketones with high enantiomeric excess, demonstrating broad applicability in synthesizing chiral compounds.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Chiral Synthesis

Background:

  • Chiral molecules are crucial in pharmaceuticals and materials science.
  • Efficient methods for obtaining enantiomerically pure compounds are highly sought after.
  • Deracemization, the conversion of a racemic mixture into a single enantiomer, is a key challenge.

Purpose of the Study:

  • To develop a novel method for the deracemization of alpha-monosubstituted ketones.
  • To utilize host-guest inclusion complexation in the solid state for chiral resolution.
  • To achieve high yields and enantiomeric excesses in the synthesis of optically active ketones.

Main Methods:

  • Employing optically active host compounds, specifically (-)-trans-2,3-bis(hydroxydiphenylmethyl)-1,4-dioxaspiro[5.4]decene (1a).
  • Utilizing alkali conditions to facilitate host-guest inclusion complexation in the solid state.
  • Characterizing the inclusion complex structure using X-ray crystallography.

Main Results:

  • Successful deracemization of alpha-monosubstituted ketones with excellent yields and high enantiomeric excesses (ee).
  • Conversion of (+/-)-2-benzylcyclohexanone to the R-isomer (74% ee) and (+/-)-3-benzylhexan-2-one to the S-isomer (96% ee) in quantitative yields.
  • Elucidation of the inclusion complex structure revealing hydrogen bonding and van der Waals interactions between host (1a) and guest ((R)-2a).

Conclusions:

  • Solid-state host-guest inclusion complexation provides an effective strategy for deracemizing alpha-monosubstituted ketones.
  • The developed method offers a new pathway for efficient synthesis of enantiomerically pure compounds.
  • Demonstrated application in the short-step synthesis of valuable chiral molecules like (R)-alpha-lipoic acid and (R)-(-)-epilachnene with high ee.