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Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

4.8K
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.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Preparation of Nitriles01:12

Preparation of Nitriles

2.8K
One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

4.0K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

3.0K
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
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

2.7K
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...
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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

3.9K
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.
3.9K

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Updated: Mar 24, 2026

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
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Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles

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N-Arylazetidines: Preparation through Anionic Ring Closure.

Pierre Quinodoz1, Bruno Drouillat1, Karen Wright1

  • 1Institut Lavoisier de Versailles, UMR 8180. Université de Versailles St-Quentin-en-Yvelines, Université Paris Saclay , 45, Avenue des Etats-Unis, Versailles 78035 Cedex, France.

The Journal of Organic Chemistry
|March 3, 2016
PubMed
Summary
This summary is machine-generated.

We developed an efficient synthesis for N-aryl-2-cyanoazetidines from beta-amino alcohols. This method provides valuable, derivatizable scaffolds for medicinal chemistry applications.

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Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
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Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
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Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Synthetic Chemistry

Background:

  • Azetidines are important heterocyclic compounds in medicinal chemistry.
  • Developing efficient and versatile synthetic routes to substituted azetidines is crucial.

Purpose of the Study:

  • To report an efficient synthesis of diversely substituted N-aryl-2-cyanoazetidines.
  • To provide access to novel scaffolds for medicinal chemistry.

Main Methods:

  • A three-step sequence starting from enantiomerically pure beta-amino alcohols.
  • Key steps include copper-catalyzed N-arylation, N-cyanomethylation, and base-induced anionic ring closure.
  • The process involves one-pot mesylation followed by ring closure.

Main Results:

  • High-yielding synthesis of N-aryl-2-cyanoazetidines with predictable substitution patterns.
  • Demonstrated predictable diastereoselectivity in the synthesis.
  • The resulting azetidines are amenable to further derivatization via Suzuki coupling or nitrile transformation.

Conclusions:

  • The developed method provides a versatile route to valuable azetidine scaffolds.
  • The rigid, planar structure of the synthesized compounds is confirmed by calculations and crystallography.
  • These azetidines represent promising building blocks for drug discovery.