2,4-Dichloro-5-fluoropyrimidine → 2-Chloro-4-(1-ethoxyvinyl)-5-fluoropyrimidine

Temperature

75 °C

To a solution of 2,4-dichloro-5-fluoro-pyrimidine (5.2 g, 31.14 mmol) in DMF (60 mL) was added tributyl-(1-ethoxy-vinyl)-stannane (12.37 g, 361.2 mmol), followed by dichlorobis(triphenylphosphine) palladium(II) (0.438 g, 0.623 mmol). The mixture was heated at 75° C. for 2 hours, cooled to rt and concentrated. The oily residue was dissolved in ethyl ether and a saturated solution of aqueous potassium fluoride was added and the mixture was stirred at room temperature for 18 hours. After dilution with EtOAc and filtration through Celite, the organic phase was washed with water, brine and concentrated. The crude material was purified by CombiFlash (0 to 10% EtOAc/Hex) to give desired product. LCMS-ESI+: calc'd for C8H9ClFN2O: 203.0 (M+H+); Found: 203.1 (M+H+); 1H NMR (400 MHz, Chloroform-d) δ 8.45 (d, J=2.8 Hz, 1H), 5.30 (d, J=3.1 Hz, 1H), 4.71 (d, J=3.1 Hz, 1H), 3.96 (q, J=7.0 Hz, 2H), 1.42 (t, J=7.0 Hz, 3H).

1. temperaturecooled to rt
2. concentrationconcentrated
3. dissolutionThe oily residue was dissolved in ethyl ether
4. additiona saturated solution of aqueous potassium fluoride was added
5. filtrationAfter dilution with EtOAc and filtration through Celite
6. washthe organic phase was washed with water, brine
7. concentrationconcentrated
8. customThe crude material was purified by CombiFlash (0 to 10% EtOAc/Hex)

ORD record

ord-1a620d7222644e5bbe3f983046e446c4

Source dataset

uspto-grants-2015_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08987250B2