Three-component synthesis of arene-linked pyrazolo[1,5-a]pyrimidines

n this study, we aimed to establish an efficient method for synthesizing two new series of arene-linked pyrazolo[1,5-a]pyrimidines. This was achieved by reacting 1H-pyrazole-3,5-diamines with the respective acetophenones and benzaldehydes in a 1:1:1 ratio. To optimize this three-component reaction, various bases, and solvents were investigated. Use of two equivalents of KOH in ethanol at reflux for 4–6 h resulted in 89%–96% yields of the desired products. Structure of new products was elucidated by considering their elemental and spectral data.