Bagher Mohammadi - Department of Chemistry, Payame Noor university, P. O. BOX ۱۹۳۹۵-۳۶۹۷, Tehran, Iran
Maryam Rahmani - Department of Chemistry, Payame Noor university, P. O. BOX ۹۷, Abhar, Iran

A simple and efficient synthesis of dialkyl 3-(alkylamino)-1-aryl-1H-pyrazole-4,5-dicarboxylateswas described in this work via a three component reaction between arylhydrazine,alkylisocyanide and dialkylacetylenedicarboxylates in the presence of phenylisocyanate and α-Fe2O3 nanoparticles. Eco friendly, solvent-free conditions, excellent yields, and short reactiontimes, inexpensive and readily available catalysts were the main advantages of this method.Inthis work, phenylisocyanateand α-Fe2O3 nanoparticles were used as a potent mixed catalyst forpromoting the reaction and taking it in a special way to obtain the titled compounds in good toexcellent yields. This reaction was not carried out without any of the components of this mixedcatalyst. It means that, for performance of this reaction, both of the mixed catalyst componentsare required.

Pyrazole; α-Fe2O3; phenylisocyanate; nanocatalyst; solvent-free