3-Aryl(heteryl)-4-formylpyrazoles by condensation with malonic acid furnish 3-[3-aryl(heteryl)pyrazol-4-yl]propenoic acids that in the presence of Raney nickel are reduced by hydrazine hydrate to 3-[3-aryl(heteryl)pyrazol-4-yl]propanoic acids. The successive conversion of both type acids into the corresponding acyl chlorides, esters, and amides was performed.
Microwave‐Assisted Synthesis of 3‐(4‐Pyrazolyl)propenoic Acids
摘要:
Under microwave activation, pyrazole-4-carboxaldehydes react with malonic acid in the presence of a small amount of pyridine to give 3-(4-pyrazolyl)propenoic acids in high yields.