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Novel 2,5‐disubstituted thiadiazoles bearing different substituents are obtained by cyclization of thiosemicarbazide (IV) followed by reaction with electrophilic reagents, such as aromatic aldehydes, isatin, phenyl isothiocyanate, and carbon disulfide.

of 2-methyl-3-(2-oxo-2H-chromene)amido-5,6,7,8-tetrahydro-4H-benzo thieno[2,3d]pyrimidin-4-one 4A mixture of thienopyrimidine 3 (1 g, 3.3 mmol) and salicyaldehyde (0.4 ml, 3.3 mmol) in the presence of catalytic amount of piperidine (0.5 ml) in dioxane (10 ml) was refluxed for 4hrs. The

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