Synthesis of carboxamide and sulfonamide bearing novel pyrazolopyridones

Abstract

The reaction of pyridones with hydrazine hydrate to furnished pyrazolopyridones 1a-l followed by reaction with p-Toluenesulfonyl chloride in basic condition affords 2a-l in high yields with short reaction time. The pyridone derivatives were prepared by the reaction of ketene dithioacetals (KDTA) with cyanoacetamide usingsodium isopropoxide as an effective base. The reactions were carried out with range of solvent and found i-Propyl alcohol as suitable solvent. We have demonstrated the process of highly functionalized pyrazolopyridones in high yields.