Calcium Carbonate → 4-Bromo-2-fluoro-5-methylaniline

Participants

Reaction Steps

To a slurry of 2-fluoro-5-methylaniline (6.75 g, 54 mmol) and CaCO3 (10 g, 100 mmol) in CH2Cl2 (1 L) and MeOH (400 mL) was added a solution of Benzyltrimethylammonium tribromide (22.3 g, 57 mmol) in CH2Cl2 (180 mL) and MeOH (70 mL). The solution was added dropwise and the mixture was stirred over night. The solution was a light orange/tan color. The mixture was filtered and the solvent was removed under reduced pressure. The resulting slurry was diluted with H2O (100 mL) and extracted with Et2O (3×200 mL). The mixture was purified by flash column chromatography (Hex:Et2O 2:1 to Et2O) to provide (9 g, 69.5% yield) the product as a white solid. 1H-NMR (DMSO-d6) δ 7.23 (d, J=10.8 Hz, 1H), 6.74 (d, J=10.8 Hz, 1H), 5.27 (s, 2H), 2.20 (s, 3H).

Provenance & Evidence