1,1'-Carbonyldiimidazole → N-[4-(2-Fluorophenylcarbonyl)phenyl]-3,3,3-trifluoro-2-hydroxy-2-trifluoromethylpropanamide

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Reaction Steps

To a stirred solution of 3,3,3-trifluoro-2-hydroxy-2-trifluoromethylpropanoic acid (1.17 g, 5.5 mmol) in dry tetrahydrofuran (35 mL) was added 1,1'-carbonyldiimidazole (0.89 g, 5.5 mmol). The mixture was heated at reflux for 45 minutes, then cooled to room temperature. 4-Amino-2'-fluorobenzophenone (1.08 g, 5.0 mmol) was added in one portion and the reaction mixture heated at reflux for 48 hours. Tetrahydrofuran was removed from the reaction mixture in vacuo, and the residue dissolved in ethyl ether and filtered. The filtrate was washed with 3N HCl (50 mL) and water. The ether extract was dried (MgSO4) and concentrated in vacuo to an off-white solid which was purified by flash column chromatography (5% v/v ethyl ether/methylene chloride). Recrystallization of the resulting solid from hexane yielded the title propanamide as a tan solid (0.83 g, 40%); mp 137°-139° C. 1H--NMR (300 MHz, d6 --DMSO): 7.36-7.42 (m, 2H, aromatic) 7.54-7.60 (m, 1H, aromatic) 7.63-7.69 (m, 1H, aromatic) 7.76-7.79 (m, 2H, aromatic) 7.92-7.96 (m, 2H, aromatic) 9.84 (s, 1H, NH) 10.86 (bs, 1H, OH). MS (CI, CH4): 410 (M+1).

Provenance & Evidence