Reaktion #40972

Reaktionsgleichung

water

K2CO3

5-(2,4-Dimethyl-oxazol-5-yl)-1H-pyrimidine-2,4-dione

1-bromo-4-chloro-butane

→

1-(4-Chloro-butyl)-5-(2,4-dimethyl-oxazol-5-yl)-1H-pyrimidine-2,4-dione

Ausbeute 47.0%

Lösungsmittel

DMF

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGAfter stirring
2. 2
   Sonstigethe reaction at room temperature for 48 hours
3. 3
   Extraktionthe mixture was extracted with diethylether
4. 4
   ExtraktionThe aqueous layer was then extracted with ethyl acetate
5. 5
   TrocknenThe organic phase was dried (Na2SO4)
6. 6
   Filtrationfiltered
7. 7
   Sonstigeevaporated
8. 8
   Sonstigethe crude was used without further purification in the next step (200 mg, 47% yield)

Vorschrift

5-(2,4-Dimethyl-oxazol-5-yl)-1H-pyrimidine-2,4-dione (Prep61, 300 mg, 1.45 mmol) was dissolved in dry DMF (4 ml) and K2CO3 (300 mg, 2.17 mmol) was added. The mixture was stirred at room temperature for 1 h, then a solution of 1-bromo-4-chloro-butane (commercially available from Aldrich, 496 mg, 2.9 mmol) in dry DMF (1 ml) was added. After stirring the reaction at room temperature for 48 hours, water was added and the mixture was extracted with diethylether. The aqueous layer was then extracted with ethyl acetate. The organic phase was dried (Na2SO4), filtered and evaporated; the crude was used without further purification in the next step (200 mg, 47% yield).

Quelle