Reaktion #216584

Reaktionsgleichung

sodium hydride

phenol

4-chloro-2-methylthiopyrimidine

→

2-methylthio-4-phenoxypyrimidine

Lösungsmittel

DMF

water

DMF

DMF

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeAn exothermic reaction
2. 2
   Sonstigerose to 5° C
3. 3
   workup.STIRRINGAfter stirring under nitrogen for 30 minutes at 10° C.
4. 4
   Extraktionextracted with ether (2×20 ml)
5. 5
   WaschenThe combined ether extracts were washed with 5% sodium hydroxide solution (2×15 ml) and brine (15 ml)
6. 6
   Sonstigedried
7. 7
   SonstigeEvaporation of the solvent

Vorschrift

To a suspension of sodium hydride (0.3 g,6.85 mmol, 50% dispersion in oil pre-washed with n-hexane) in dry DMF (4 ml) was added dropwise a solution of phenol (0.59 g, 6.23 mmol) in dry DMF (1 ml). The resulting mixture was stirred under an atmosphere of nitrogen until effervescence had ceased. The resulting mixture was diluted with dry DMF (3 ml) and then added dropwise to a stirred solution of 4-chloro-2-methylthiopyrimidine (1.00 g, 6.23 mmol) in dry DMF (3 ml) at 0° C. An exothermic reaction took place and the temperature of the reaction mixture rose to 5° C. After stirring under nitrogen for 30 minutes at 10° C., GC analysis indicated the formation of a single product (98.8%). The reaction mixture was diluted with water (15 ml) and extracted with ether (2×20 ml). The combined ether extracts were washed with 5% sodium hydroxide solution (2×15 ml) and brine (15 ml) and then dried. Evaporation of the solvent gave 2-methylthio-4-phenoxypyrimidine as a pale yellow oil (1.40 g, 94% pure by GC) which was used directly in the next stage. 1H NMR delta: 2.37(3H, s)ppm.

Quelle