Synthesis 2025; 57(05): 1050-1058
DOI: 10.1055/a-2497-1767
paper

Three-Component Synthesis of Cyanopyrazoles Employing Diazo­acetonitrile

Rekha Singroha
a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
,
Patrick Onen
a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
,
Usha Yadav
a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
b   Academy of Scientific and Innovative Research, Ghaziabad-201002, India
,
Ruchir Kant
c   Biochemistry and Structural Biology Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
,
Kishor Mohanan
a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
b   Academy of Scientific and Innovative Research, Ghaziabad-201002, India
› Institutsangaben
Financial support by the Science and Engineering Research Board, DST, Govt. of India (File No CRG/2021/006185) is gratefully acknowledged.


Abstract

An efficient three-component reaction involving aldehydes, β-ketophosphonates, and diazoacetonitrile has been developed for the construction of highly substituted cyanopyrazoles. The reaction proceeds by a three-step, domino process comprised of a base-mediated Horner–Wadsworth–Emmons reaction/(3+2) cycloaddition and subsequent oxidation to form pyrazole derivatives. A wide range of readily available aldehydes and ketophosphonates were used to access these exciting scaffolds under mild conditions.

Supporting Information



Publikationsverlauf

Eingereicht: 12. September 2024

Angenommen nach Revision: 29. Oktober 2024

Accepted Manuscript online:
05. Dezember 2024

Artikel online veröffentlicht:
02. Januar 2025

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