Synthesis of some substituted 1, 3, 4-oxadiazoles, thiadiazoles and 1, 2, 4-triazoles

الملخص EN

In this paper the synthesis of some substituted 1,3,4-oxadiazoles, 1,3,4-thiadiazoles and 1,2,4-triazoles is reported.

Ethyl methacrylate was treated with hydrazine hydrate in ethanol to give the corresponding hydrazide (1).

The hydrazide was converted to 1-acyl thiosemicarbazide (2) byits reaction with ammonium thiocyanate, which was treated with sodium hydroxide solution and with concentrated sulfuric acid to give 5-substituted-1,2,4-triazoles-3-thiol (3) and 2-substituted-5-amino-1,3,4- thiadiazole (4) respectively.

The acid hydrazide (1) was treated with benzaldehyde or substituted benzaldehyde to give hydrazones (7-12), the hydrazones were then cyclized with lead dioxide to 2-subtituted-5-phenyl 1,3,4-oxadiazole (14).

The reaction of the hydrazide (1) with formic acid gave 1-formyl-2-acyl hydrazine (6) and the cyclization of (6) by phosphorus pentaoxide gave monosubstituted-1,3,4-oxadiazoles (13).

Acid hydrazide (1) was treated with phenyl isothiocyanate to give substituted thiosemicarbazide (5).

The structure of the synthesized compounds were confirmed by physical and spectral means.