Fusion heterocyclic compounds have various biological activities, such as anticancer, antibacterial, antifungal and anti-inflammatory, and thus have been widely used in the field of medicinal chemistry. Pyrrolopyrimidines are a major class of fused heterocyclic compounds. Compared with single pyrrole and pyrimidine cores, pyrrolopyrimidines have more diverse and effective pharmacological characteristics as fusion scaffolds.
Oxadiazoles are a class of heterocyclic aromatic compounds with the molecular formula C2H2N2O, which have special biological activities and thermodynamic properties. Five-membered heterocyclic moieties composed of three or two heteroatoms are of great interest to researchers because these compounds show significant therapeutic potential. These heterocycles can serve as a building block for the development of novel molecular structures.