Pyrazolopyrimidine scaffolds are one of the most important heterocyclic compounds in drug discovery. This scaffold has various biological activities, among which anticancer is an important one.
Pyrrolidine, also known as tetrahydropyrrole, is a saturated five-membered heterocyclic ring, which is miscible with water. Pyrrolidine exists in many alkaloids and drug molecules, such as kappa opioids, antagonists of dopamine D4 receptors, and HIV reverse transcriptase inhibitors.