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DOI: 10.1055/s-0043-1773546
Pyrazol-3-yldiazonium Salts as Key Reagents for C–C Bond Formation and Pyrazole-Containing Heterocycle Synthesis
This work was supported in part by the Simons Foundation (Award Number: 00014574) and by the Ministry of Education and Science of Ukraine, for which we would like to express our sincere thanks.

Abstract
A novel application of 1-methylpyrazol-3-yldiazonium salts in the Meerwein reaction was introduced. These diazonium salts reacted with α,β-unsaturated functionalized compounds under Meerwein reaction conditions to yield pyrazole-containing building blocks, which subsequently allowed cyclization reactions with bisnucleophiles for the synthesis of pyrazol-3-yl-containing heterocyclic systems. In this way, pyrazole-containing heterocyclic compounds with 2-aminothiazole, 2-aminoselenazole, thiazolidin-4-one, selenazolidin-4-one, 3-hydroxythiophene, and 3-aminothiophene rings were efficiently prepared.
Key words
3-aminopyrazoles - pyrazolyldiazonium salts - Meerwein reaction - thiazoles - selenazoles - thiophenes - C–C bond formationSupporting Information
- Supporting information for this article is available online at https://doi-org.accesdistant.sorbonne-universite.fr/10.1055/s-0043-1773546.
- Supporting Information
Publikationsverlauf
Eingereicht: 25. März 2025
Angenommen nach Revision: 30. April 2025
Artikel online veröffentlicht:
20. Mai 2025
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