2-Fluoro-4-methylaniline → HCID 29067503, compound

Temperature

22 °C

A solution of 2-fluoro-4-methylaniline (6.8 mL, 60 mmol) in tetrahydrofuran (200 mL) was cooled to −78° C. and treated with n-butyllithium (26 mL of a 2.5 M solution in hexanes, 66 mmol) and stirred for 1 h. A solution of 2-fluoronitrobenzene (6.3 mL, 60 mmol) in tetrahydrofuran (20 mL) was added dropwise over 5 min, and the reaction mixture was stirred at −78° C. for 0.5 h, then warmed to 22° C. After 16 h, the reaction mixture was concentrated, diluted with ethyl ether (200 mL), washed with 2 M hydrochloric acid (200 mL), dried (Na2SO4), and concentrated to a black oil. A solution of this black oil in a mixture of methanol (100 mL) and ethyl acetate (100 mL) was treated with 10% palladium on carbon (1 g) and stirred under a hydrogen atmosphere at 65 psi for 2 h, and then the reaction mixture was filtered, and concentrated. Flash chromatography (SiO2, 10→100% dichloromethane/hexanes) provided N-(2-fluoro-4-methylphenyl)benzene-1,2-diamine (7.0 g) as an orange solid:

1. stirringthe reaction mixture was stirred at −78° C. for 0.5 h
2. waitAfter 16 h
3. concentrationthe reaction mixture was concentrated
4. additiondiluted with ethyl ether (200 mL)
5. washwashed with 2 M hydrochloric acid (200 mL)
6. dry with materialdried (Na2SO4)
7. concentrationconcentrated to a black oil
8. additionA solution of this black oil in a mixture of methanol (100 mL) and ethyl acetate (100 mL)
9. additionwas treated with 10% palladium on carbon (1 g)
10. stirringstirred under a hydrogen atmosphere at 65 psi for 2 h
11. filtrationthe reaction mixture was filtered
12. concentrationconcentrated

ORD record

ord-8e6be969a58d49c894fd9c5d38580317

Source dataset

uspto-grants-2009_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07601722B2