A series of novel pyrazolopyrimidine and pyrazoloquinazoline derivatives have been synthesized in one pot, three-component synthesis method under solvent-free conditions by using 5-aminopyrazole, p-substituted benzoylacetonitrile/dimedone and triethylorthoesters. All new compounds were synthesized in one step without synthesizing the enol ethers or open chain intermediates by green approach without using solvent and/or catalyst. All newly synthesized compounds were characterized by spectral and analytical methods.

Keywords: 5-Aminopyrazole; Dimedone; Triethylorthoesters; Pyrazolo[1,5-a]quinazoline; Cyclocondensation;