Ethanol → 3-Bromo-4-fluoroaniline

To a solution of 2-bromo-1-fluoro-4-nitrobenzene (A. Groweiss, Org. Process Res. Dev., 2000, 4, 30-33) in tetrahydrofuran (75 ml) and ethanol (75 ml) was added tin(II) chloride dihydrate and the mixture left to stir at ambient temperature for 4 h. The solvent was evaporated and the residue was treated with ice-cold 2 N sodium hydroxide solution (200 ml). The resulting slurry was stirred for 30 min then extracted with dichloromethane (3×200 ml). The combined organic phase was washed with water (200 ml) and brine (200 ml), dried (MgSO4), filtered and evaporated to give 3-bromo-4-fluorophenylamine (7.92 g, 92%) as a yellow oil: 1H NMR (360 MHz, CDCl3) δ 3.53 (2H, s), 6.53-6.57 (1H, m), 6.83-6.85 (1H, m), 6.90 (1H, dd, J 9, 9 Hz).

1. waitthe mixture left
2. customThe solvent was evaporated
3. additionthe residue was treated with ice-cold 2 N sodium hydroxide solution (200 ml)
4. stirringThe resulting slurry was stirred for 30 min
5. extractionthen extracted with dichloromethane (3×200 ml)
6. washThe combined organic phase was washed with water (200 ml) and brine (200 ml)
7. dry with materialdried (MgSO4)
8. filtrationfiltered
9. customevaporated

ORD record

ord-a6cba2d1bdd14d258bda50f8b777b297

Source dataset

uspto-grants-2003_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06617326B2