Acetic Acid → 2-Amino-4-bromo-5-fluorobenzaldehyde

To a mixture of 4-bromo-5-fluoro-2-nitrobenzaldehyde (2.219 g, 8.947 mmol) and iron powder (2.535 g, 45.39 mmol), EtOH (30.0 mL) was added, followed by AcOH (10.0 mL) and water (5.0 mL). The reaction mixture was stirred at room temperature for 2 h, then concentrated under reduced pressure. EtOAc (150 mL) was added to the resulting residue. The mixture formed was filtered through a pad of diatomaceous earth. The diatomaceous earth pad was washed with 10 wt % aq. K3PO4 (150 mL) and EtOAc (100 mL). The organic layer was separated and then was washed with brine (150 mL), dried over Na2SO4 and concentrated under reduced pressure. The resulting residue was purified by flash chromatography on silica gel (0-30% EtOAc in hexanes) to give the sub-title compound as a yellow solid (1.518 g, 78%). LCMS calc. for C7H6BrFNO (M+H)+: m/z=218.0. found 217.9.

1. additionwas added
2. concentrationconcentrated under reduced pressure
3. additionEtOAc (150 mL) was added to the resulting residue
4. customThe mixture formed
5. filtrationwas filtered through a pad of diatomaceous earth
6. washThe diatomaceous earth pad was washed with 10 wt % aq. K3PO4 (150 mL) and EtOAc (100 mL)
7. customThe organic layer was separated
8. washwas washed with brine (150 mL)
9. dry with materialdried over Na2SO4
10. concentrationconcentrated under reduced pressure
11. customThe resulting residue was purified by flash chromatography on silica gel (0-30% EtOAc in hexanes)

ORD-Eintrag

ord-4f8ae34fd6034e0dad53a9c6c6dc4b0f

Quelldatensatz

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09278950B2