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An efficient and environmental benign method is reported for the synthesis of some pyrazolopyrimidine derivatives using 3-methyl-1-phenyl-5-pyrazolone with carbonyl compounds in the presence of  nanozeolite Nax catalysts, solvent-free and at  reflux conditions. It is noteworthy to mention that this method of the synthesis requires less time, less temperature, and better yield

journal of catalysts

Catalytic Synthesis of Pyrazolo[3,4-d]pyrimidin-6-ol and Pyrazolo[3,4-d]pyrimidine-6-thiol Derivatives Using Nanoparticles of NaX Zeolite as Green Catalyst