2,6-Dibromo-4-methylpyridine → N-(6-bromo-4-methylpyridine-2-yl)-5-fluoro-4-methylpyridine-2-amine

Temperature

88 °C

Into a flask were added 2,6 dibromo-4-methyl pyridine (10.0 g, 40.0 mmol), sodium tert-butoxide (4.4 g, 46.0 mmol), 2-amino-4-methyl-5-fluoro pyridine (5.8 g, 45.8 mmol) and 1,1′-bis(di-tert-butylphosphino)ferrocene palladium dichloride (1.3 g, 1.9 mmol) followed by nitrogen sparged 1,4-dioxane (100 mL). The slurry was evacuated and refilled with nitrogen three times and then heated to 88° C. for 5 hours. After cooling to 25° C., ethyl acetate (100 mL) and water (20 mL) were added and the layers were separated. The organic layer was washed with 10% aqueous sodium chloride solution (25 mL) and then concentrated under reduced pressure. The residue was purified by chromatography on silica gel (10-50% ethyl acetate/hexanes) to afford N-(6-bromo-4-methylpyridine-2-yl)-5-fluoro-4-methylpyridine-2-amine. 1H NMR (600 MHz, DMSO-d6) δ 9.87 (s, 1H), 8.07 (d, J=0.8 Hz, 1H), 7.61 (s, 1H), 7.32 (d, J=5.6 Hz, 1H), 6.87 (s, 1H), 2.20 (s, 3H), 2.19 (s, 3H).

1. customsparged 1,4-dioxane (100 mL)
2. customThe slurry was evacuated
3. additionrefilled with nitrogen three times
4. temperatureAfter cooling to 25° C.
5. additionethyl acetate (100 mL) and water (20 mL) were added
6. customthe layers were separated
7. washThe organic layer was washed with 10% aqueous sodium chloride solution (25 mL)
8. concentrationconcentrated under reduced pressure
9. customThe residue was purified by chromatography on silica gel (10-50% ethyl acetate/hexanes)

ORD record

ord-fb7ec53980374528937aeff74fff67e9

Source dataset

uspto-grants-2015_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09120785B2