Journal
SYNLETT
Volume 31, Issue 12, Pages 1158-1162Publisher
GEORG THIEME VERLAG KG
DOI: 10.1055/s-0040-1707111
Keywords
pyrazoles; vinyldiazoacetates; vinyldiazo compounds; cyclization; electrocyclization
Categories
Funding
- Carl-Zeiss-Stiftung
- Friedrich-Schiller-Universitat Jena
- Ernst Ludwig Ehrlich Foundation
- State of Thuringia [2015 FGI0021]
- European Regional Development Fund (ERDF)
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Vinyldiazo compounds undergo a thermal electrocyclization to form pyrazoles in yields of up to 95%. The reactions are operationally simple, use readily available starting materials, require no intervention of a catalyst, and enable the synthesis of mono-, di- and tri-substituted pyrazoles. With the ability to produce highly substituted pyrazoles and the flexibility in installing various types of substituents, this method constitutes a new entry to this valuable heterocyclic scaffold and may be of interest to all branches of the chemical industry.
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