Hydrochloric Acid → 4-Tert-butyl-2-chloro-5-fluoro-6-(methylthio)pyrimidine

Temperatur

15 °C

To a cold (0° C.) solution of tert-butylmagnesium chloride (7.5 mL, 1M solution in THF, 7.5 mmol) in THF (15 mL) was added slowly a solution of 2-chloro-5-fluoro-4-(methylthio)pyrimidine (0.9 g, 5.0 mmol) in 1,2-dimethoxyethane (5 mL). The reaction mixture was stirred at 15° C. for 1 hour, then cooled to 0° C. and triethylamine (0.7 mL, 5.0 mmol) was added, followed by the addition of a solution of iodine (1.3 g, 5.0 mmol) in tetrahydrofuran (3 mL). Water (10 mL) was added to quench the reaction and pH was adjusted to 1 using 6N hydrochloric acid. The aqueous phase was extracted twice with ethyl acetate (2×15 mL). The combined organic phases were washed with aqueous sodium thiosulfate and then brine, dried over MgSO4, filtered and concentrated in vacuo to give a brown solid which was used without further purification.

1. temperaturecooled to 0° C.
2. customto quench
3. customthe reaction and pH
4. extractionThe aqueous phase was extracted twice with ethyl acetate (2×15 mL)
5. washThe combined organic phases were washed with aqueous sodium thiosulfate
6. dry with materialbrine, dried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customto give a brown solid which
10. customwas used without further purification

ORD-Eintrag

ord-07d22c2c78e14fc29ccdb6c200f084d3

Quelldatensatz

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08829007B2