Diisopropylethylamine → 2-amino-5-bromo-4-fluoro-N-methylbenzamide

Participants

Reaction Steps

A solution of 2-amino-5-bromo-4-fluorobenzoic acid (2.00 g, 8.55 mmol), methylamine hydrochloride (0.692 g, 10.2 mmol), TBTU (2.74 g, 8.55 mmol), and DIPEA (4.46 mL, 25.6 mmol) in DCM (15.0 mL) was stirred at rt for 30 minutes. The reaction was quenched with sat. aq. NaHCO3 (10 mL) and extracted with DCM (15 mL). The organic layer was washed with brine (10 mL), dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to a yellow oil. The crude material was purified on a Teledyne ISCO Combiflash® Rf system using DCM/MeOH (100:0→95:5) as eluent to afford the title compound as 2.54 g of a white solid. 1H NMR (CDCl3, 400 MHz): δ 7.48 (d, J=7.3 Hz, 1H), 6.44 (d, J=10.4 Hz, 1H), 6.11 (br. s., 1H), 5.66 (br. s., 2H), 2.96 (d, J=4.8 Hz, 3H). MS (ESI): m/z 248.91 [M+H]+. UPLC: tR=3.26 min (ZQ3: polar—5 min).

Provenance & Evidence