1,2,4-Oxadiazoles: Synthesis and Applications

1,2,4-Oxadiazole are compounds that have attracted the attention of many researchers due to their wide range of biological activities. Methods used for the synthesis of 3,5-substituted 1,2,4-oxadiazoles are reviewed in this works, as well as their applications. The syntheses are based mostly on the use of primary amidoximes and acylating agents as the initial reactants. In the last years, numerous reports concerning new methods of synthesis of 1,2,4-oxadiazoles have been reported. The use of microwave irradiation and ultrasound in chemical synthesis has many advantages with consequent impacts on the economy and the environment.