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The carbonyl carbon in an aldehyde or ketone is the site of a nucleophilic attack due to its electron-deficient nature. Depending on the strength of the incoming nucleophile, the reaction occurs via different mechanistic pathways.
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Organomagnesium halides, commonly known as Grignard reagents, convert nitriles to ketones and proceed through a nucleophilic acyl substitution. Nitriles react with a Grignard reagent, followed by an aqueous acid, to yield ketones. The reaction introduces a new carbon–carbon bond. The alkyl–magnesium bond in the Grignard reagent is highly polar, so the alkyl carbon develops a carbanionic character and acts as a nucleophile.
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Cu-Catalyzed C-N Coupling with Sterically Hindered Partners.

Atanu Modak1, Alex J Nett2, Elizabeth C Swift2

  • 1Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102, United States.

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|April 17, 2023
PubMed
Summary

A novel pyrrole-ol ligand enables copper-catalyzed C-N coupling of sterically hindered amines and ortho-substituted aryl iodides. This discovery offers a new pathway for synthesizing complex molecules, overcoming previous limitations in challenging coupling reactions.

Keywords:
C–N couplinganilinecopperligand miningsterically hindered partners

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Medicinal Chemistry

Background:

  • Palladium-catalyzed C-N coupling is a versatile synthetic tool.
  • Coupling sterically hindered substrates remains a significant challenge in organic synthesis.
  • Copper catalysis offers an earth-abundant alternative to palladium.

Purpose of the Study:

  • To discover and develop a novel ligand for copper-catalyzed C-N coupling.
  • To facilitate the coupling of sterically hindered reaction partners, specifically ortho-substituted aryl iodides and hindered amines.
  • To address the limitations of existing methods in challenging C-N bond formation.

Main Methods:

  • Library screening approach to identify potential ligands.
  • Development and optimization of a pyrrole-ol ligand.
  • Evaluation of the ligand's efficacy in copper-catalyzed C-N coupling reactions with sterically hindered substrates.

Main Results:

  • Discovery of a pyrrole-ol ligand effective for challenging C-N coupling.
  • Successful coupling of ortho-substituted aryl iodides with sterically hindered primary and secondary amines, anilines, and amides.
  • Demonstrated broad functional group tolerance in the developed reaction.

Conclusions:

  • The pyrrole-ol ligand is uniquely effective for copper-catalyzed C-N coupling of hindered substrates.
  • This method provides a valuable new tool for synthesizing complex organic molecules.
  • Mining pharmaceutical libraries is a viable strategy for discovering novel catalytic ligands.