Reaktion #162139

Reaktionsgleichung

iodine

tert-butylmagnesium chloride

2-chloro-5-fluoro-4-(methylthio)pyrimidine

hydrochloric acid

triethylamine

→

4-tert-butyl-2-chloro-5-fluoro-6-(methylthio)pyrimidine

Lösungsmittel

tetrahydrofuran

THF

1,2-dimethoxyethane

Water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturcooled to 0° C.
2. 2
   Sonstigeto quench
3. 3
   Sonstigethe reaction and pH
4. 4
   ExtraktionThe aqueous phase was extracted twice with ethyl acetate (2×15 mL)
5. 5
   WaschenThe combined organic phases were washed with aqueous sodium thiosulfate
6. 6
   Trocknenbrine, dried over MgSO4
7. 7
   Filtrationfiltered
8. 8
   Einengenconcentrated in vacuo
9. 9
   Sonstigeto give a brown solid which
10. 10
    Sonstigewas used without further purification

Vorschrift

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.

Quelle