Ethyl Acetate → Methyl 5-amino-2-bromobenzoate

Methyl 2-bromo-5-nitrobenzoate (25.3 g, 97.3 mmol) was dissolved in anhydrous methanol (500 mL), Tin (II) chloride (93.3 g, 487 mmol) was added thereto, and then the reaction mixture was refluxed for 2 hours. The reaction mixture was cooled down, ethyl acetate (500 mL) and water (100 mL) were added thereto, the mixture was neutralized with 4N aqueous sodium hydroxide solution, and then filtered on celite. The filtrate was concentrated under reduced pressure, ethyl acetate (200 mL) was added thereto, and then the mixture was washed with saturated aqueous sodium hydrogen carbonate solution (200 mL, 2 times), water (200 mL), and saturated brine (200 mL) successively. The organic layer was dried over anhydrous magnesium sulfate and the solvent was removed under reduced pressure to give the titled reference compound (21.0 g) as a pale yellow oil. (Yield 94%)

1. temperaturethe reaction mixture was refluxed for 2 hours
2. temperatureThe reaction mixture was cooled down
3. filtrationfiltered on celite
4. concentrationThe filtrate was concentrated under reduced pressure, ethyl acetate (200 mL)
5. additionwas added
6. washthe mixture was washed with saturated aqueous sodium hydrogen carbonate solution (200 mL, 2 times), water (200 mL), and saturated brine (200 mL) successively
7. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
8. customthe solvent was removed under reduced pressure

ORD-Eintrag

ord-924d0b76929e42fdb038bbb50f4c3bfd

Quelldatensatz

uspto-grants-2015_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08975256B2