Sodium Hydroxide → Methyl 3-amino-2-bromobenzoate

Temperatur

55 °C

A solution of stannous chloride (15.0 g, 76.1 mM) in 30 mL of concentrated hydrochloric acid was slowly added to a solution of methyl 2-bromo-3-nitrobenzoate (4.0 g, 15.4 mM) in 90 mL ethanol at 15-30° C. over 1 hour. The mixture was then heated at 50-60° C. for 15 minutes. The mixture was cooled to room temperature and made alkaline by slow addition of solid sodium hydroxide maintaining a temperature of 30-35° C. The resultant mixture was extracted three times with chloroform. The extracts were washed with brine, dried over sodium sulfate, filtered and concentrated to afford 3.51 g (99%) of methyl 2-bromo-3-aminobenzoate as a yellow oil, identical in all respects to the material derived via catalytic hydrogenation described above.

1. temperatureThe mixture was cooled to room temperature
2. extractionThe resultant mixture was extracted three times with chloroform
3. washThe extracts were washed with brine
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated

ORD-Eintrag

ord-9dd5a6b47bc9471c8f8df6ef65779300

Quelldatensatz

uspto-grants-2004_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06713645B1