Tetrahydrofuran is a heterocyclic organic compound with the molecular formula C4H8O. Tetrahydrofuran belongs to ethers and is the complete hydrogenation product of furan. It is a colorless, water-miscible organic liquid with small viscosity at normal temperature and pressure. Because of its long liquid range, it is a commonly used medium polar aprotic solvent. Its main use is as a precursor of high molecular polymers.
Nitrogen-containing heterocyclic compounds have a wide range of applications in medicine, organic materials, natural products and other fields, mainly for biologically active molecules. Pyrrolopyrazines contain pyrrole and pyrazine rings as bioactive scaffolds. Compounds containing this scaffold have a wide range of biological activities, such as antibacterial, anti-inflammatory, antiviral, antifungal, antioxidant, antitumor, and kinase inhibition.