4-Fluorophenol → Methyl 4-[[2-(4-fluorophenoxy)-4,6-bis(trifluoromethyl)benzoyl]amino]benzoate

Participants

Reaction Conditions

Reaction Steps

4-Fluorophenol (12.05 mg, 0.1075 mmol), methyl 4-[[2-fluoro-4,6-bis(trifluoromethyl)benzoyl]amino]benzoate (40 mg, 0.09774 mmol), and K2CO3 (40.52 mg, 0.29 mmol) were combined in DMF (0.5 mL) and heated at 90° C. for 10 min resulting in complete conversion to methyl 4-[[2-(4-fluorophenoxy)-4,6-bis(trifluoromethyl)benzoyl]amino]benzoate. NaOH (97.73 μL of 3 M, 0.29 mmol) was added and the reaction heated at 90° C. for 2 hours, then at 50° C. for overnight. Additional NaOH was added [2×NaOH (97.73 μL of 3 M, 0.29 mmol), 6 eq] and the reaction heated at 90° C. for 5 hours. HPLC purification using a gradient of acetonitrile in water (10-99%) with 5 mM HCl as a modifier provided 4-(2-(4-fluorophenoxy)-4,6-bis(trifluoromethyl)benzamido)benzoic acid (11) as a white solid. ESI-MS m/z calc. 487.06, found 488.3 (M+1)+; Retention time: 1.84 minutes (3 minutes run). 1H NMR (400 MHz, DMSO-d6) δ 12.83 (s, 1H), 11.14 (s, 1H), 7.99 (s, 1H), 7.94 (d, J=8.7 Hz, 2H), 7.73 (d, J=8.7 Hz, 2H), 7.48 (s, 1H), 7.36-7.22 (m, 4H) ppm.

Provenance & Evidence