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Thermal Cyclization of 3-(1-Naphthyl)-1-phenylpyrazole-4-carboxylic Acid in Polyphosphoric Acid.

✍ Scribed by M. K. Bratenko; V. A. Chornous; M. V. Vovk

Publisher: John Wiley and Sons
Year: 2003
Weight: 81 KB
Volume: 34
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.200318103

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✦ Synopsis

Abstract

For Abstract see ChemInform Abstract in Full Text.

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## 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 cyclo