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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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Updated: Dec 25, 2025

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

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Published on: June 10, 2021

The Forgotten Pyrazines: Exploring the Dakin-West Reaction.

Martien A Würdemann¹, Cristina Niţu², Stefaan M A De Wildeman¹

¹Aachen Maastricht Institute for Biobased Materials (AMIBM), Maastricht University, Urmonderbaan 22, 6167 RD, Geleen, The Netherlands.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|March 28, 2020

Summary

Pyrazines, nitrogen-containing heterocycles, were synthesized from amino acids using the Dakin-West reaction. This method provides a versatile route to functional pyrazines for diverse applications.

Keywords:

amino acids biobased building blocks nitrogen heterocycles radical ions synthetic methods

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

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Published on: November 15, 2017

Area of Science:

Organic Chemistry
Heterocyclic Chemistry
Biomass Valorization

Background:

Pyrazines are underreported N-heterocycles with potential as functional aromatic alternatives.
Nitrogen-rich biomass is a source of valuable chemical building blocks.

Purpose of the Study:

To explore the synthesis of pyrazines from amino acids via the Dakin-West reaction.
To optimize conditions for pyrazine formation and synthesize functional dimethylpyrazines.

Main Methods:

Qualitative screening of proteinogenic amino acids as substrates for the Dakin-West reaction.
Scale-up of the reaction to multigram synthesis of intermediate α-acetamido ketones.
Optimization of pyrazine formation conditions using δ-amino-levulinic acid.

Main Results:

Several functional proteinogenic amino acids were identified as suitable substrates.
Successful multigram synthesis of α-acetamido ketone intermediates.
High-purity synthesis of five functional dimethylpyrazines was achieved.

Conclusions:

The Dakin-West reaction provides efficient access to functional pyrazines from amino acids.
Synthesized pyrazines serve as versatile aromatic building blocks.
Potential applications include the synthesis of polymers and metal-organic frameworks.