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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

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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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The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

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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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Preparation of Amides01:29

Preparation of Amides

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Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
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Continuous-Flow Ritter Reaction for Sustainable Amide Synthesis Using a Recyclable m-Phenolsulfonic Acid-Formaldehyde

Eman Soliman1,2, Heeyoel Baek1, Nobuyuki Mase3

  • 1RIKEN Center for Sustainable Resource Science, Wako, Saitama 351-0198, Japan.

The Journal of Organic Chemistry
|January 13, 2025
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Summary

A novel continuous-flow synthesis efficiently produces amides using a reusable solid acid catalyst. This sustainable Ritter reaction method offers high yields and catalyst recycling for scalable amide production.

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Area of Science:

  • Organic Chemistry
  • Chemical Engineering
  • Sustainable Chemistry

Background:

  • Traditional amide synthesis methods can be inefficient and generate significant waste.
  • Developing sustainable and scalable catalytic processes is crucial for modern chemical manufacturing.

Purpose of the Study:

  • To develop a rapid and efficient continuous-flow synthesis of amides.
  • To utilize a reusable solid acid catalyst for the Ritter reaction.
  • To establish an environmentally sustainable and scalable amide synthesis method.

Main Methods:

  • Employed a continuous-flow system for amide synthesis.
  • Utilized a reusable solid acid catalyst: m-phenolsulfonic acid-formaldehyde resin (PAFR II).
  • Applied the Ritter reaction to convert nitriles and alcohols to amides.

Main Results:

  • Achieved high yields of amides, up to 90%.
  • Demonstrated short reaction times in the continuous-flow system.
  • Maintained catalyst activity for several weeks, enabling catalyst recycling.

Conclusions:

  • The developed continuous-flow method provides an efficient, scalable, and sustainable route for amide synthesis.
  • The reusable solid acid catalyst (PAFR II) is effective for the Ritter reaction, promoting environmental benefits.
  • This approach offers significant advantages over traditional batch processes for industrial applications.