Nitrogen → 3-[Cyclopropyl-(2,4-dichloro-benzoyl)-amino]-5-phenyl-thiophene-2-carboxylic acid methyl ester

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To a solution of 3-Cyclopropylamino-5-phenyl-thiophene-2-carboxylic acid methyl ester (52 mg, 0.19 mmol) in dichloroethane (10 ml) in an atmosphere of N2 was added 2,4-dichlorobenzoyl chloride (45 mg, 0.21 mmol). The reaction mixture was stirred for 16 h at reflux. Then, the solvant was removed and the residue was purified by flash chromatography (8:2 Hexane/EtOAc) to obtain 85 mg (99%) of 3-[Cyclopropyl-(2,4-dichloro-benzoyl)-amino]-5-phenyl-thiophene-2-carboxylic acid methyl ester. NMR 1H (CDCl3, 400 MHz): 7.64 ppm (d, 2H, Haro); 7.47 ppm (m, 2H, Haro); 7.44-7.33 ppm (m, 3H, Haro); 7.21-7.12 ppm (m, 2H, Haro); 3.89 ppm (s, 3H); 3.33 ppm (m, minor rotamer); 3.13 ppm (m, 1H, major rotamer) 1.01-0.49 ppm (m, 4H).

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