Pyrazolones are traditionally synthesized by the reaction of -keto esters with hydrazine and its derivatives. To date, synthesis of these compounds have been somewhat limited by the available chemistry. The methods available in literature to synthesize -keto esters are suffers by the use of carbon dioxide and carbon monoxide sources in presence of Pd or transition metal catalysts, long reaction time, use of excess reagent, inconsistent yield, large quantity of by products (due to self Claisen condensation) and require tedious work up procedures to remove the same. Unfortunately the existing...