Facile multi-components one-pot synthesis of dipyrazolo[1,5-a:3',4'-d]pyrimidine as potent bioactive scaffolds

An efficient, three-component, catalyst free synthesis of dipyrazolo [1,5-a:3',4'-d]pyramid scaffolds has been carried out using 3-methyl-1H-pyrazol-5(4H)-one (1), 5-amino pyarazole (2a-b) and substituted aromatic aldehydes. The reaction underwent cyclocondensation reaction in reflux condition with moderate to good (62%-90 %) yields. The twenty newly prepared molecules were analyzed by means of 1 H & 13 C NMR, Mass, and IR spectroscopies and their activities against the bacterial and fungal strains were screened. Some of tested compounds have shown excellent antibacterial activities while another four were found to have good antifungal activity.