Polyfunctional pyrazoles 6.* Convenient method for the synthesis of 1-aryl-1H-pyrazole-3,4-dicarboxylic acids
摘要:
A preparatively convenient method was developed for the synthesis of 1-aryl-1H-pyrazole-3,4-di-carboxylic acids based on the alkaline hydrolysis and oxidation of 1-aryl-4-formyl-1H-pyrazole-3-carboxylic esters with hydrogen peroxide in an aqueous medium.
Polyfunctional pyrazoles 5*. preparative synthesis of 1-aryl-4-formylpyrazole- 3-carboxylic acids
摘要:
Treatment of methyl pyruvate N-arylhydrazones with the Vilsmeier-Haack reagent gave methyl 1-aryl4- formylpyrazole-3-carboxylates, basic hydrolysis of which yielded the corresponding acids.