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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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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Thiazole formation through a modified Gewald reaction.

Carl J Mallia1, Lukas Englert1, Gary C Walter2

  • 1Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, United Kingdom.

Beilstein Journal of Organic Chemistry
|July 1, 2015
PubMed
Summary

Researchers explored synthesizing thiazoles and thiophenes from nitriles using a modified Gewald reaction. The study utilized 1,4-dithiane-2,5-diol as an aldehyde precursor, yielding different heterocyclic compounds based on substrate structure.

Keywords:
1,4-dithiane-2,5-diolGewald reactiondesign of experiment (DOE)thiazolethiophene

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Area of Science:

  • Organic Chemistry
  • Heterocyclic Chemistry

Background:

  • The Gewald reaction is a versatile method for synthesizing thiophenes.
  • Exploring modifications of established synthetic routes is crucial for expanding chemical diversity.

Purpose of the Study:

  • To investigate the synthesis of thiazoles and thiophenes from nitriles.
  • To evaluate the utility of 1,4-dithiane-2,5-diol as an aldehyde precursor in heterocyclic synthesis.

Main Methods:

  • Utilized a modified Gewald reaction.
  • Employed various nitrile substrates.
  • Used 1,4-dithiane-2,5-diol as the aldehyde precursor.

Main Results:

  • Successfully synthesized 2-substituted thiazoles.
  • Successfully synthesized 2-substituted aminothiophenes.
  • Product outcome (thiazole vs. aminothiophene) was dependent on the substitution pattern of the α-carbon adjacent to the cyano group.

Conclusions:

  • The modified Gewald reaction provides a viable route to diverse thiazole and thiophene derivatives.
  • 1,4-Dithiane-2,5-diol is an effective precursor for generating these heterocyclic systems.
  • Substituent effects on the starting materials can direct the regioselectivity of the reaction.