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.
Isoindolinones are ubiquitous structural motifs in natural products and pharmaceuticals. Isoindolinones are precursors to other valuable building blocks.