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Functionalization and cyclization reactions of 4-benzoyl-1,5-diphenyl- 1H-pyrazole-3-carboxylic acid

✍ Scribed by Yunus Akcamur; Ahmet Sener; Alemdar Mustafa Ipekoglu; Gert Kollenz

Publisher
Journal of Heterocyclic Chemistry
Year
1997
Tongue
English
Weight
294 KB
Volume
34
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

The 1__H__‐pyrazole‐3‐carboxylic acid 2 or its remarkably stable acid chloride 3 can easily be converted into the corresponding ester or amide derivatives 4 or 5, respectively, from reaction with alcohols or N‐nucleophiles. Pyrazolo[3,4‐d]pyridazines 6a,b are obtained from cyclocondensation reactions of the pyrazoles 2 and 3, respectively, with phenylhydrazine or hydrazine hydrate, while 6c is formed in an one‐pot procedure from the furan‐2,3‐dione 1 and hydrazine hydrate.

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