A series of Mannich bases 5a-5h were synthesized by the reaction of 5–{2–(ethylthio)–1H– benzimidazol–1–yl}–methyl–1,3,4–oxadiazole–2–thione 4 with formaldehyde and appropriate amines by conventional and microwave techniques. The reaction rate and yields were enhanced under microwave irradiation technique rather than conventional technique. Structures were characterized by means of spectral dat...

The carbohydrazide 1 was used as the precursor for the synthesis of a number of new aromatic C-nucleosides containing 1,3,4-oxadiazole 7, [1,3,4]oxadiazolo[2,3-a]isoindole 10b and pyrazole units 18. On the other hand, the thiosemicarbazone 20 was used as the key intermediate for synthesis of 1,3,4-oxadiazole  and 1,2,4-triazole-3-thione derivatives 21 and 23. The antioxidant activities of the p...

In the title compound, C(25)H(21)F(2)N(3)O(3)S, the morpholine ring adopts a chair conformation. The 1,3,4-oxadiazole-2(3H)-thione group makes dihedral angles of 78.69 (8), 53.56 (7) and 55.30 (9)° with the benzene rings. In the crystal, O-H⋯O, C-H⋯S and C-H⋯F hydrogen bonds linked the mol-ecules into layers lying parallel to the ab plane. Weak C-H⋯π inter-actions also occur.

A new imidazole-2-thione fused furazan biheterocyclic group was synthesized and its biological activity investigated. Nitrogen rich heterocycles, 1,2,5-oxadiazole (furazan) have been conveni ently fused. To accomplish this, we improved a strategy that silica gel supported solvent free micro wave dehydration of vicinal dioximes. The target "N,N’-diphenyl-4H-imidazo[4,5-c]furazan-5(6H) –thio ne" ...