Reaktion #1883564

Reaktionsgleichung

4-[2-(p-Tolyl)-5-trifluoromethyloxazol-4-yl]butanenitrile

methanol

water

water

→

objective compound

Methyl 4-[2-(p-tolyl)-5-trifluoromethyloxazol-4-yl]butanoate

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturcooling under bubbling hydrogen chloride gas
2. 2
   workup.STIRRINGstirred for 30 minutes
3. 3
   workup.STIRRINGthe mixture was stirred for 30 minutes
4. 4
   workup.WAITto stand at room temperature overnight
5. 5
   Extraktionthe reaction solution was extracted with ethyl acetate
6. 6
   WaschenThe extract was washed with saturated aqueous sodium hydrogen carbonate solution
7. 7
   Trocknendried over anhydrous magnesium sulfate
8. 8
   Einengenconcentrated
9. 9
   SonstigeThe residue was purified by silica gel column chromatography (Wakogel® C-200, n-hexane:ethyl acetate=4:1)

Vorschrift

4-[2-(p-Tolyl)-5-trifluoromethyloxazol-4-yl]butanenitrile (5.28 g) was dissolved in 40 ml of methanol, and stirred for 10 minutes under ice-cooling under bubbling hydrogen chloride gas. After the bubbling was stopped, the mixture was warmed to room temperature and stirred for 30 minutes. To the reaction solution was added 5 ml of water, and the mixture was stirred for 30 minutes, allowed to stand at room temperature overnight. After addition of water, the reaction solution was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogen carbonate solution, dried over anhydrous magnesium sulfate and concentrated. The residue was purified by silica gel column chromatography (Wakogel® C-200, n-hexane:ethyl acetate=4:1) to provide 5.63 g of the objective compound as colorless crystals. M.p. 44.5–45° C.

Quelle