Isoxazole is a liquid heterocyclic compound C3H3NO isomeric with oxazole and having a penetrating odor like that of pyridine. Isoxazoles belong to an important class of five-membered aromatic heterocycles containing two electronegative heteroatoms, nitrogen and oxygen, in a 1,2-relationship and three regular sp2 carbon atoms. These molecules are found to be key components in various synthetic products in daily use and also present as a pharmacophore essential for biological activity in many drugs and bioactive natural products. In addition, isoxazoles have demonstrated their ability to exhibit hydrogen bond donor/acceptor interactions with a variety of enzymes and receptors.
The pyrazolopyrazine ring system is a very interesting class of heterocyclic compounds considered as important scaffolds for many effective bioactive agents with low toxicity, antioxidant, anticonvulsant, antiparasitic, anti-inflammatory, antiviral, antibacterial, anti- Fungal and analgesic activity.
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