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

Participants

Reaction Conditions

Reaction Steps

tert-Butyl (Z)-5,6-dihydro-5-oxo-4-[(1H-pyrrol-2-yl)methylene]-4H-thieno[2,3-b]pyrrole-2-carboxylate (150 mg, 0.47 mmol) was dissolved in dichloromethane (8 ml), cooled to 0° C., treated with trifluoroacetic acid (0.75 ml) and stirred for 2 hours warming to room temperature. The reaction mixture was evaporated to dryness and triturated with diethyl ether to give 70 mg of (Z)-5,6-dihydro-5-oxo-4-[(1H-pyrrol-2-yl)methylene]-4H-thieno[2,3-b]pyrrole-2-carboxylic acid as a red solid. MS(ES): m/e 260 [M+H].

Provenance & Evidence