Methyl iodide → 2-Fluoro-4-methoxyaniline

3-Fluoro-4-nitrophenol (10.17 g, 64.7 mmol) (Aldrich) was dissolved in dimethylformamide (210 mL). Potassium carbonate (45 g, 323 mmol) and methyl iodide (5 mL, 77.64 mmol) (Aldrich) were added and the reaction mixture was stirred at room temperature overnight. (thin layer chromatography: 20% ethyl acetate in hexanes showed complete conversion). The reaction mixture was filtered through a bed of Celite®, and concentrated under reduced pressure. The crude material was triturated with ether and insoluble materials were removed by filtration. The filtrate was concentrated under reduce pressure to afford an orange solid. This material (11.43 g) was dissolved in methanol (150 mL) and hydrogenated for 1.5 hours in a Parr apparatus at 50 psi, in the presence of 10% palladium on carbon (1.5 g) (Aldrich). (thin layer chromatography: 20% ethyl acetate in hexanes showed complete conversion). The reaction mixture was filtered through Celite®, washed with ethyl acetate, then concentrated under reduced pressure to give 2-fluoro-4-methoxyaniline as a solid. (Yield 3.81 g, 26.99 mmol).

1. filtrationThe reaction mixture was filtered through a bed of Celite®
2. concentrationconcentrated under reduced pressure
3. customThe crude material was triturated with ether and insoluble materials
4. customwere removed by filtration
5. concentrationThe filtrate was concentrated
6. customto afford an orange solid
7. filtrationThe reaction mixture was filtered through Celite®
8. washwashed with ethyl acetate
9. concentrationconcentrated under reduced pressure

ORD record

ord-4635acab74eb488ba7a2d07f35323098

Source dataset

uspto-grants-2006_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07112676B2