Dimethylformamide → 3-{4-[6-(4-tert-butylphenylcarbamoyl)-1H-benzimidazol-2-yl]-3,5-dimethylphenyl}-propionic acid methyl ester

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Reaction Steps

A mixture of 3,4-diamino-N-(4-tert-butylphenyl)-benzamide (200 mg, 710 μmol), 3-(4-formyl-3,5-dimethylphenyl)-propionic acid methyl ester (190 mg, 860 μmols) (from Example 6-17) and oxone (286 mg, 470 μmols) in a solution of 5 mL DMF/0.5 mL water was stirred at ambient temperature for 1 h. The mixture was poured into ethyl acetate and extracted once with water and five times with brine. The organic phase was dried, filtered, and the solvent was removed under reduced pressure. The residue was purified by chromatography using a gradient of 50-90% heptane/ethyl acetate to afford 3-{4-[6-(4-tert-butylphenylcarbamoyl)-1H-benzimidazol-2-yl]-3,5-dimethylphenyl}-propionic acid methyl ester. 1H-NMR (CDCl3, 400 MHz): δ 8.51 (s, broad, 1H), 8.07 (s, broad, 1H), 7.58 (d, J=8.5 Hz, 1H), 7.53 (d, J=8.1 Hz, 2H), 7.31 (d, J=8.6 Hz, 2H), 6.82 (s, 2H), 3.63 (s, 3H), 2.89 (t, J=7.4 Hz, 2H), 2.63 (t, J=7.4 Hz, 2H), 1.92 (s, 6H), 1.30 (s, 9H). MS (ESI) m/z 484.3 (M+H).

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