Triethylamine → Ethyl (3-chloro-4-{[(2-chloro-5-{[(3-chlorophenyl)methyl]oxy}phenyl)carbonyl]amino}-2-fluorophenyl)acetate

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A solution of 2-chloro-5-{[(3-chlorophenyl)methyl]oxy}benzoic acid (200 mg, 0.67 mmol) in dichloromethane (3 ml) was treated with oxalyl chloride (90 ul, 1.0 mmol) and DMF (1 drop). Effervescence was observed and the mixture was stirred at room temperature for 30 minutes. The solvent was then evaporated in vacuo and azeotroped with toluene. The resulting solid was dissolved in dichloromethane (3 ml) and treated with triethylamine (140 ul, 1.0 mmol) and a solution of ethyl (4-amino-3-chloro-2-fluorophenyl)acetate (230 mg, 1.0 mmol) in dichloromethane (2 ml). The mixture was stirred at room temperature for 2 hours. The mixture was then diluted with acetonitrile and purified by SCX cartridge eluting with acetonitrile. Fractions combined and evaporated, residue purified by MDAP to give the title compound as a white solid (110 mg). MS (ES+) m/z 510 [M+H]+ (C24H1935Cl3FNO4). 1H-NMR (400 MHz, d6-DMSO) δ 1.20 (3H, t, J 7.2), 3.81 (2H, s), 4.12 (2H, q, J 7.2), 5.20 (2H, s), 7.16-7.55 (9H, m).

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