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The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
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Introduction
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Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
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In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
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Copper-Catalyzed Dearomative 1,2-Hydroamination.

Christopher W Davis1, Yu Zhang2, Yanrong Li1

  • 1Department of Chemistry, University of Illinois, Urbana, IL 61801, USA.

Angewandte Chemie (International Ed. in English)
|May 23, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel catalytic method for hydroamination of nonactivated aromatic compounds, enabling the synthesis of complex amines from simple olefins and arenes. The approach utilizes copper catalysis and dearomatization for efficient and scalable production of valuable chemical structures.

Keywords:
arenesarenophilescopperdearomatizationhydroamination

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Catalytic olefin hydroamination is atom-economical but struggles with nonactivated aromatic compounds.
  • Synthesizing complex amines from simple precursors remains a challenge in organic chemistry.

Purpose of the Study:

  • To develop a method for the formal hydroamination of nonactivated aromatic compounds.
  • To extend olefin hydroamination to aromatic pi-systems.
  • To provide general access to structurally complex amines.

Main Methods:

  • Arenophile-mediated dearomatization coupled with copper catalysis.
  • Application to various substituted arenes and heteroarenes.
  • Density Functional Theory (DFT) calculations for mechanistic insights.
  • Development of a scalable desymmetrization protocol.

Main Results:

  • Successful 1,2-hydroamination of nonactivated arenes.
  • Broad substrate scope including substituted arenes and heteroarenes.
  • Identification of mechanistic understanding and selectivity trends via DFT.
  • Generation of enantioenriched dearomatized products.

Conclusions:

  • The developed dearomative strategy provides a general route to complex amines.
  • The method enables efficient synthesis of densely functionalized small molecules.
  • Scalable desymmetrization allows for enantioselective synthesis and downstream applications.