反应详情

温度

40 °C

The ester obtained in the previous step was dissolved in dichloromethane (1 mL). 2,2,2-Trifluoroacetic acid (4 mL, 52.50 mmol) was added and the reaction was stirred at 40° C. for 18 hours. The excess TFA and dichloromethane was evaporated under reduced pressure. The crude product was filtered and purified by reverse phase preparative chromatography utilizing a gradient of 30-99% acetonitrile in water containing HCl as a modifier to yield 4-(2-(2,4-difluorophenoxy)-4-(perfluoroethyl)benzamido)benzoic acid (2) (31.8 mg, 22%). ESI-MS m/z calc. 487.07, found 488.5 (M+1)+; Retention time: 2.01 minutes (3 minutes run). 1H NMR (400 MHz, DMSO-d6) δ 12.80 (s, 1H), 10.92 (s, 1H), 7.98-7.87 (m, 3H), 7.87-7.75 (m, 2H), 7.68-7.59 (m, 1H), 7.57-7.45 (m, 1H), 7.44-7.31 (m, 1H), 7.22-7.13 (m, 1H), 7.11 (s, 1H) ppm.

1. customThe excess TFA and dichloromethane was evaporated under reduced pressure
2. filtrationThe crude product was filtered
3. custompurified by reverse phase preparative chromatography
4. additioncontaining HCl as a modifier