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

Participants

Reaction Conditions

Reaction Steps

tert-Butyl (Z)-5,6-dihydro-4-[(3-methoxy-1H-pyrrol-2-yl)methylene]-5-oxo-4H-thieno[2,3-b]pyrrole-2-carboxylate (0.5 g, 1.45 mmol) was dissolved in dichloromethane (8 ml), cooled to 0° C., treated with trifluoroacetic acid (2 ml) and stirred for 3 hours warming to room temperature. The reaction mixture was evaporated to dryness and triturated with diethyl ether to give 300 mg of (Z)-5,6-dihydro-4-[(3-methoxy-1H-pyrrol-2-yl)methylene]-5-oxo-4H-thieno[2,3-b]pyrrole-2-carboxylic acid as a red solid. MS(ES): m/e 291 [M+H].

Provenance & Evidence