Acetic Acid → 5-Bromo-2-methoxyaniline

Temperature

100 °C

A mixture of 4-bromo-1-methoxy-2-nitrobenzene (3.0 g, 12.9 mmol) and glacial acetic acid (25 ml) was heated at 100° C. under an atmosphere of nitrogen. Iron powder (2.2 g, 38.8 mmol) was added and the mixture was stirred for one hour at a temperature of 100° C. The mixture was cooled to ambient temperature then water (100 ml) was added and the mixture was extracted with ethyl acetate (3×25 ml). The combined organic extracts were washed with saturated aqueous sodium bicarbonate (3×25 ml) and then brine. The organic solution was dried over magnesium sulfate filtered and the filtrate evaporated under reduced pressure to give a residue. Purification of the material by flash chromatography on silica gel using heptane/ethyl acetate (6:4) as an eluent yielded 5-bromo-2-methoxyaniline (2.0 g): 1H NMR (DMSO-d6, 400 MHz) 6.76 (s, 1H), 6.71 (d, 1H), 6.61 (d, 1H), 4.99 (bs, 2H), 3.74 (s, 3H); (TLC (heptane/ethyl acetate 1:1) Rf 0.5; RP-HPLC (Hypersil HyPurity Elite C18, 5 m, 200 A, 250×4.6 mm; 25-100% acetonitrile-0.1 M ammonium acetate over 25 min, 1 ml/min) tr=13.33 min.; MS: MH+443.

1. temperatureThe mixture was cooled to ambient temperature
2. extractionthe mixture was extracted with ethyl acetate (3×25 ml)
3. washThe combined organic extracts were washed with saturated aqueous sodium bicarbonate (3×25 ml)
4. dry with materialThe organic solution was dried over magnesium sulfate
5. filtrationfiltered
6. customthe filtrate evaporated under reduced pressure
7. customto give a residue
8. customPurification of the material by flash chromatography on silica gel

ORD record

ord-e63b7695612142e585244efbb7a2edf8

Source dataset

uspto-grants-2011_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07863444B2