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An efficient and simple procedure for the synthesis of 6-amino-5-cyano-4-phenyl-pyrano[2,3-c]pyrazole-4-carboxylic acid esters was developed via a one-pot reaction of β-ketoester, hydrazine, benzoylacetate, and malononitrile in 50% EtOH catalyzed by InCl3 under ultrasound irradiation. This method is more economic, convenient, nontoxic, and environmentally friendly than established methods of pyranopyrazole...
A facile, efficient and environmentally safe strategy for the synthesis of pyrazolopyranopyrimidines via one-pot, four-component reaction of hydrazine hydrate, barbituric acid, ethyl acetoacetate, and aromatic aldehydes in polyethylene glycol (PEG) as a safe solvent in the absence of catalyst at ambient temperature has been described. The advantages of the present protocol, such as simplicity, mild...
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