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Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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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...

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.

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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...

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Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid

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Published on: November 15, 2017

Cyclopropanation using flow-generated diazo compounds.

Nuria M Roda¹, Duc N Tran, Claudio Battilocchio

¹Innovative Technology Centre, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK. svl1000@cam.ac.uk.

Organic & Biomolecular Chemistry

|January 21, 2015

Summary

This summary is machine-generated.

A new room temperature process enables the cyclopropanation of electron-poor olefins using unstabilised diazo compounds. This method efficiently generates valuable functionalised cyclopropanes, important 3D building blocks for synthesis.

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Area of Science:

Organic Chemistry
Synthetic Chemistry
Flow Chemistry

Background:

Cyclopropanes are versatile 3D building blocks in organic synthesis.
Traditional cyclopropanation methods often require harsh conditions or specialized reagents.
Developing efficient and mild cyclopropanation protocols remains a key challenge.

Purpose of the Study:

To develop a novel room temperature process for the cyclopropanation of electron-poor olefins.
To utilize unstabilised diazo compounds generated under continuous flow conditions.
To synthesize a diverse range of functionalised cyclopropanes.

Main Methods:

Continuous flow generation of unstabilised diazo compounds.
Room temperature reaction conditions for cyclopropanation.
Application to various electron-poor olefins and diazo species.

Main Results:

Successful cyclopropanation of electron-poor olefins at room temperature.
Generation of functionalised cyclopropanes with high utility.
Demonstration of the protocol's broad applicability across different substrates.

Conclusions:

The developed continuous flow process offers an efficient and mild route to functionalised cyclopropanes.
This method provides valuable 3D building blocks for further synthetic applications.
The room temperature protocol overcomes limitations of existing cyclopropanation techniques.