Tetrahydrofuran → N-(3-Amino-2,5-dimethyl-4-thienyl)-N'-(4-methyl-3-thienyl)thiourea

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Reaction Steps

A mixture of 1 g of 3,4-diamino-2,5-dimethylthiophene dihydrochloride, 60 ml of anhydrous THF and 1.05 g of triethylamine was stirred at room temperature for 30 minutes and then admixed with 0.902 g of 4-methyl-3-thienyl isothiocyanate. After the mixture had been heated to 35–40° C. for 15 minutes, it was stirred for approx. 18 hours, the solvent was distilled off and the residue was admixed with water and extracted repeatedly with ethyl acetate. After the solvent of the combined organic phases had been distilled off, the residue was purified by column chromatography on silica gel using a solvent mixture of equal parts of toluene and ethyl acetate. After the solvent had been distilled off under reduced pressure, a semicrystalline oil was obtained and was used without further purification.

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