5-Fluoro-2-nitrophenol → 2-Amino-5-fluorophenol

A suspension of 3-fluoro-6-nitrophenol (500 mg, 3.18 mmol) and zinc (2.10 g, 31.8 mmol) in acetic acid (7.3 mL) was stirred overnight at room temperature. The reaction mixture was filtered through celite and washed with DCM. After evaporation and distillation under vacuum (2.10−2 mbar) of the solvents, the residue was dissolved in DCM. The organic phase was washed with a saturated solution of NaHCO3 and brine, dried over MgSO4, filtered and evaporated. The crude residue was purified by flash chromatography (DCM/MeOH 99.5:0.5) to yield 177 mg (1.39 mmol, 44%) of 2-amino-5-fluorophenol as an orange solid.

1. filtrationThe reaction mixture was filtered through celite
2. washwashed with DCM
3. customAfter evaporation and distillation under vacuum (2.10−2 mbar) of the solvents
4. dissolutionthe residue was dissolved in DCM
5. washThe organic phase was washed with a saturated solution of NaHCO3 and brine
6. dry with materialdried over MgSO4
7. filtrationfiltered
8. customevaporated
9. customThe crude residue was purified by flash chromatography (DCM/MeOH 99.5:0.5)

ORD record

ord-96dba0dabba64a7cb0cde105bd09a60d

Source dataset

uspto-grants-2014_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08883826B2