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

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

3.4K
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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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

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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.
3.2K
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

3.5K
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.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
3.5K
Preparation of Amides01:29

Preparation of Amides

3.0K
Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
3.0K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

1.9K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
1.9K
Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

2.8K
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.
2.8K

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Modular synthesis of cyclic β-difluoroamines.

Natalie G Charlesworth1, Dhanarajan Arunprasath1, Mark A Graham2

  • 1School of Chemistry, GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, 6 Triumph Road, Nottingham NG7 2GA, UK. ross.denton@nottingham.ac.uk.

Chemical Communications (Cambridge, England)
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Summary

This study presents a novel, modular two-step synthesis for creating cyclic fluorinated amines. This new method avoids hazardous reagents and lengthy procedures, offering a more efficient route to valuable chemical structures.

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Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis
  • Fluorine Chemistry

Background:

  • Fluorine-containing heterocycles are crucial in medicinal chemistry for property tuning.
  • Current methods for cyclic fluorinated amines involve hazardous reagents or multiple steps.

Purpose of the Study:

  • To develop a modular and efficient synthesis for cyclic beta-fluoroalkyl amines.
  • To establish a new method that avoids hazardous reagents and lengthy procedures.

Main Methods:

  • Photoredox-catalyzed cyclization reaction.
  • Hydrogen atom transfer (HAT) reaction.
  • Utilized bromodifluoroethylamines as starting materials.

Main Results:

  • A modular two-step synthesis for cyclic beta-fluoroalkyl amines was successfully developed.
  • The new method offers an alternative to hazardous reagents and lengthy synthesis routes.
  • Demonstrated the utility of photoredox catalysis in accessing fluorinated nitrogen heterocycles.

Conclusions:

  • The reported synthesis provides a valuable new tool for medicinal and biological chemists.
  • This approach enhances the accessibility of important fluorinated building blocks.
  • Highlights the potential of photoredox catalysis in synthetic organic chemistry.