Condensation of 2,4-dioxohexenoates (I) with arylhydrazines (II) led to 1-aryl-3-ethoxycarbonyl-5-styrylpyrazoles (IIIa) which on oxidation and decarboxylation gave 1-phenylpyrazole-3-carboxylic acids (Vb).
H. El Khadem, L. Rateb and H. Mokhtar, J. Chem. Soc. C, 1968, 1845 DOI: 10.1039/J39680001845
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