Bromine → 5-Bromo-2-fluoro-4-hydroxy-benzoic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 66.43A (2.03 g, 11.9 mmol) in acetic acid (65 mL) was added a pre-mixed solution of bromine (0.67 mL, 13.1 mmol) in acetic acid (10 mL). The mixture was stirred at 45° C. and monitored with TLC and LC-MS. After 18 hours, the reaction mixture was concentrated under reduced pressure. Brine was added to the residue, and the mixture was extracted three times with EtOAc. The combined organic layers were dried over anhydrous magnesium sulfate, filtered and concentrated to provide 66.43B as a white solid (2.12 g, 71% yield). 1H NMR (400 MHz, CDCl3) δ ppm 8.13 (1H, d, J=7.4 Hz), 6.82 (1H, d, J=11.3 Hz), 6.04 (1H, s), 3.92 (3H, s).

Provenance & Evidence