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Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

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

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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...
2.3K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

2.6K
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,...
2.6K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.5K
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...
3.5K
Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

7.9K
The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
7.9K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.2K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
3.2K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

4.9K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
4.9K

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Preparation of N-2-alkoxyvinylsulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines
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Benzazetidines and Related Compounds: Synthesis and Potential.

Riccardo Salvio1,2, Simone Placidi3, Marco Bella3

  • 1Dipartimento di Scienze e Tecnologie Chimiche, Università "Tor Vergata", Via della Ricerca Scientifica, 1, 00133, Roma, Italy.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 3, 2020
PubMed
Summary

Benzazetidines, strained N-heterocycles, are gaining interest for drug design. Recent advances in palladium-catalyzed C-H amination and organocatalysis offer efficient synthetic routes for these valuable compounds.

Keywords:
N-heterocyclesazetidinescyclization reactionsorganocatalysisring strain

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Synthetic Chemistry

Background:

  • Benzazetidines are N-heterocycles with significant potential in biological applications and drug design.
  • Their inherent ring strain has historically limited the development of robust synthetic methods.
  • A resurgence in interest is noted due to recent innovative synthetic strategies.

Purpose of the Study:

  • To comprehensively review existing literature on benzazetidine synthesis.
  • To analyze the reactivity studies of benzazetidine compounds.
  • To highlight recent advancements in synthetic methodologies.

Main Methods:

  • Literature review of synthetic approaches.
  • Analysis of reactivity studies.
  • Focus on palladium-catalyzed intramolecular C-H amination.
  • Exploration of organocatalyzed ring-closure reactions.

Main Results:

  • Early synthetic methods were often limited and inefficient.
  • Recent methodologies, particularly palladium-catalyzed C-H amination, provide efficient access.
  • Organocatalysis offers alternative routes for synthesizing benzazetidine precursors.

Conclusions:

  • Benzazetidines are increasingly accessible due to novel synthetic strategies.
  • These advancements facilitate their exploration in drug discovery and medicinal chemistry.
  • Further research into benzazetidine synthesis and reactivity is warranted.