The new green procedure for pyrazolopyrimidinone based dihydropyrimidinones and their antibacterial screening

A series of novel hybrid aza heterocycles containing pyrazolopyrimidinone and dihydropyrimidinone scaffolds was developed using Cu(II) catalyzed Biginelli condensation as an efficient, new green synthetic method under mild and solvent free conditions. Pyrazolopyrimidinone based aldehydes, alkyl acetoacetates and urea/thiourea were used as the components in the reaction to afford hybrid aza heterocycles in high to excellent yields. The products were screened for in vitro antibacterial activity and all of those demonstrated high to excellent activity.