1-Hydroxybenzotriazole → N-methoxy-N,2-dimethyl-3-[methyl(2-thienylsulfonyl)amino]-4H-thieno[3,2-b]pyrrole-5-carboxamide

Participants

Reaction Steps

To a mixture of 2-methyl-3-[methyl(2-thienylsulfonyl)amino]-4H-thieno[3,2-b]pyrrole-5-carboxylic acid (0.30 g), N-methoxymethylamine hydrochloride (100 mg), 1H-1,2,3-benzotriazol-1-ol (150 mg), triethylamine (0.15 mL) and N,N-dimethylformamide (10 mL) was added N-[3-(dimethylamino)propyl]-N′-ethylcarbodiimide hydrochloride (190 mg), and the mixture was stirred at room temperature overnight. Water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, dried (MgSO4) and concentrated. Crystallization from diethyl ether gave N-methoxy-N,2-dimethyl-3-[methyl(2-thienylsulfonyl)amino]-4H-thieno[3,2-b]pyrrole-5-carboxamide (262 mg, yield 80%) as colorless crystals. melting point 187° C.

Provenance & Evidence