Facial and Simple Synthesis of Some New (Pyrazole and Triazole) Coumarin Derivatives

2-oxo-2H-coumarin-3-carbohydrazide (2) which prepared from the reaction of ethyl-2-oxo-2Hcoumarin-3-carboxylate (1) with hydrazine hydrate in ethanol containing a catalytic amount of piperidine mixture consider a good and available starting intermediate for synthesis of series of functionalized coumarins. So, compound (2) was utilized as a key for the synthesis of some new (pyrazole, triazole)-2Hcoumarin-2-one derivatives by the reaction with some selected reagents.