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Journal of the Serbian Chemical Society 2003 Volume 68, Issue 10, Pages: 723-727
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A microwave-catalyzed rapid, efficient and ecofriendly synthesis of substituted pyrazol-5-ones (Short communication)

Dabholkar Vijay V., Gavande Rahul P.

A series of 1-(3,4-dihydro-3-oxo-2H-1,4-benzoxazine-2-carbonyl)-3-methyl-4-(substituted phenylhydrazono)-2-pyrazolin-5-ones have been synthesized by the reaction of 2H-3,4-dihydro-3-oxo-1,4-benzoxazine-2-carboxylic acid hydrazide with substituted acetoacetic ester derivatives using acetic acid as solvent under microwave irradiation (MWI), as well as by conventional methods. The reaction rate is enhanced tremendously and the yields are improved under MWI as compared to conventional methods.

Keywords: o-amino phenol, 1,4-benzoxazine, hydrazine hydrate, 1,3,4-substituted pyrazol-5-one