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NHC-Activations on α-, β-, γ-, and Beyond.

Xiaoyu Chen1, Pengyu He1, Siqi Xia1

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|March 14, 2023
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Summary
This summary is machine-generated.

N-heterocyclic carbenes (NHCs) are versatile organocatalysts. This review summarizes NHC-activation of carbonyl and imine carbons and their subsequent cycloaddition reactions.

Keywords:
N-heterocyclic carbene (NHC)acyl azoliumenolatehomoenolateremote activationvinyl enolate

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Chemistry

Background:

  • N-heterocyclic carbenes (NHCs) exhibit unique electronic properties and reactivity.
  • NHCs are increasingly utilized as organocatalysts in various chemical transformations.
  • The formation of Breslow intermediates is a key step in NHC-catalyzed reactions.

Purpose of the Study:

  • To review the development of N-heterocyclic carbene (NHC)-mediated activation of carbonyl and imine carbons.
  • To summarize the cycloaddition reactions involving NHC-generated intermediates.
  • To provide an overview of NHC catalysis beyond traditional alpha-functionalization.

Main Methods:

  • Literature review of N-heterocyclic carbene (NHC)-catalyzed reactions.
  • Analysis of reaction mechanisms involving Breslow intermediates.
  • Categorization of cycloaddition reactions based on NHC activation.

Main Results:

  • NHC activation enables the generation of various reactive intermediates, including acyl anion equivalents, enolates, homoenolates, and vinyl enolates.
  • These intermediates readily participate in diverse cycloaddition reactions.
  • NHC catalysis extends to functionalization beyond the alpha-position, including beta, gamma, and other positions.

Conclusions:

  • N-heterocyclic carbenes are powerful tools for activating carbonyl and imine functionalities.
  • NHC-catalyzed cycloaddition reactions offer efficient synthetic routes to complex molecules.
  • The scope of NHC organocatalysis continues to expand, enabling novel transformations.