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Enantioselective reductive multicomponent coupling reactions between isatins and aldehydes.

Matthew A Horwitz1, Naoya Tanaka2, Takuya Yokosaka1

  • 1Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

Chemical Science
|October 29, 2015
PubMed
Summary

A novel metal-free reaction couples isatins and aldehydes using diethyl phosphite. This stereoselective method provides high yields and selectivity, offering an efficient synthetic route.

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Area of Science:

  • Organic Chemistry
  • Asymmetric Synthesis

Background:

  • Metal-free reactions are desirable for sustainable synthesis.
  • Stereoselective synthesis of complex molecules remains a challenge.

Purpose of the Study:

  • To develop a metal-free, stereoselective reductive coupling of isatins and aldehydes.
  • To utilize readily available diethyl phosphite as a reductant.

Main Methods:

  • Base-catalyzed Pudovik addition and phosphonate/phosphate rearrangement for polarity inversion.
  • Trapping of isatin-derived carbanions by aldehydes.
  • Use of chiral iminophosphoranes as catalysts.

Main Results:

  • Achieved high yields and excellent diastereoselectivity and enantioselectivity.
  • Demonstrated a novel polarity inversion strategy for isatins.
  • Utilized cost-effective diethyl phosphite as the stoichiometric reductant.

Conclusions:

  • Developed an efficient and stereoselective metal-free reductive coupling of isatins and aldehydes.
  • The method offers a practical approach for synthesizing valuable chiral compounds.
  • Highlights the utility of chiral iminophosphoranes in asymmetric catalysis.