To a 0° C. solution of 3,4,5-trifluoro-N-(2-hydroxy-ethoxy)-2-(4-iodo-2-methyl-phenylamino)-benzamide (0.25 g, 0.536 mmol) in THF (10.72 mL) was added triethylamine (0.113 mL, 0.804 mmol). After 5 min, acetyl chloride (0.039 mL, 0.536 mmol) was added to the cold solution, which immediately produced a precipate. After stirring for 50 min between 0-5° C., the reaction mixture was partitioned between water (20 mL) and ethyl acetate (20 mL). The aqueous layer was extracted with ethyl acetate (20 mL). The organic layers were combined and dried over anhydrous magnesium sulfate. The resultant mixture was filtered and the filter cake was thoroughly rinsed with ethyl acetate. The filtrate was concentrated in vacuo to obtain a yellow oil (0.1755 g). Chromatographed crude oil using a gradient of hexanes and ethyl acetate. Combined fractions and removed the solvent in vacuo to obtain a solid. The solid was recrystalized in a mixture of hexanes/acetone to afford 0.0221 g (8%) of a solid; 1H NMR (400 MHz, Acetone-d6): δ 10.15 (br s, 1H), 8.49 (br s, 1H), 7.88 (t, J=0.9 Hz, 1H), 7.56 (s, 1H), 7.43 (d, J=8.3 Hz, 1H), 6.69 (dd, J=8.55, 5.86 Hz, 1H), 4.53 (br s, 2H), 4.19 (br s, 2H), 2.33 (s, 3H), 1.81 (br s, 3H). 19F NMR (375 MHz, Acetone-d6): δ −139.52 (br t, 1F), −146.62 (br q, 1F), −153.43 (br s, 1F). Anal. Calcd/Found for C18H16F3IN2O4: C, 42.54/40.87; H, 3.17/2.98; N, 5.51/5.17.
