Abstract
We introduce efficient regioselective synthesis of a series of novel bis(pyrazoles) and bis(isoxazoles) via 1,3-dipolar cycloaddition reaction under microwave irradiation. Unequivocal structural assignment of the obtained regioisomers was determined utilizing H-1-C-13 HMBC NMR techniques as a valuable tool. A comparative study of the aforementioned reactions was carried out under conventional method as well as under microwave irradiation conditions.