p-Toluenesulfonic acid → (Z)-5,6-dihydro-5-oxo-4-[(1H-pyrrol-2-yl)methylene]-4H-thieno[2,3-b]pyrrole-2-carboxylic acid

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Reaction Steps

(Z)-5-Oxo-4-[1H-pyrrol-2-ylmethylene]-5,6-dihydro-4H-thieno[2,3-b]pyrrole-2-carboxylic acid (tetrahydro-pyran-2-yloxy)-amide (65 mg, 0.18 mmol) was dissolved in methanol (2 ml). 4-Toluene sulfonic acid (0.09 mmol, 15 mg) was added in one portion and the solution stirred at room temperature for 2 hours. The solvent was evaporated and the residue triturated with diethyl ether to give 10 mg of (Z)-5-Oxo-4-[1H-pyrrol-2-ylmethylene]-5,6-dihydro-4H-thieno[2,3-b]pyrrole-2-carboxylic acid hydroxamide as a brown solid. MS(ES): m/e 276 [M+H].

Provenance & Evidence