New Strategy for the Synthesis of Phosphonyl Pyrazoles
摘要:
Phosphonyl hydrazones react with DMF/POCl3 to afford 3-phosphonyl pyrazoles. Phosphonyl methylene hydrazones react with DMF/POCl3 to provide 4-phosphonyl pyrazoles. 5-Phosphonyl pyrazoles are obtained from the reaction of phosphonyl chlorovinylaldehydes with phenylhydrazine.