Thiophene-2-carbohydrazide → 2-[3-sulfanyl-5-(thiophen-2-yl)-4H-1,2,4-triazol-4-yl]acetic acid

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Reaction Steps

Methyl N-(thioxomethylene)glycinate (2.06 g) and thiophene-2-carbohydrazide (2.57 g) in isopropanol (50 ml) was heated at 70° C. while stirring for 16 h. The mixture was allowed to come to r.t. and the formed precipitate collected and heated at reflux in 1.0 M aqueous NaHCO3 solution for 2 h. After cooling to r.t. and acidification with conc. HCl (aq.) the product was extracted into EA, which was washed with brine and then dried over MgSO4 before concentration to dryness to yield crude title compound which was used directly in the next step.

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