Nitrogen → 3-(2,4-Dichloro-benzylamino)-5-phenyl-thiophene-2-carboxylic acid methyl ester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Sodium hydride (60% dispersion in oil, 180 mg, 4,72 mmol) was added to an ice-cold solution of 3-Amino-5-phenyl-thiophene-2-carboxylic acid methyl ester (1000 mg, 4,29 mmol) in 25 ml of dimethylformamide in an atmosphere of N2. After 5 min, 2,4-dichloro-1-chloromethyl-benzene (755 mg, 3,86 mmol) was added to the solution and then the reaction mixture was stirred for 30 min at 0° C. and 30 min at room temperature. The mixture was partitioned between ether (20 mL) and water (20 mL) and the organic layer was separated. The aqueous phase was washed twice with ether (2×20 mL) and the combined ether layer was dried (MgSO4) and concentrated. The residue obtained was then purified by precipitation. The crude product was taken in 25 ml of ethyl acetate, a yellow precipitate came out which was filtered to obtain 3-(2,4-Dichloro-benzylamino)-5-phenyl-thiophene-2-carboxylic acid methyl ester, 835 mg (55%). 1H-NMR (DMSO, 400 MHz): 7.67 ppm (m, 2H, Haro); 7.44-7.35 ppm (m, 6H, Haro); 7.26 ppm (s, 1H, Haro); 4.63 ppm (d, 2H, N—CH2); 3.75 ppm (s, 3H, O—CH3)

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