Reaktion #1172894

Reaktionsgleichung

sodium hydroxide

ethyl 2-[2-(1,1-dimethylethyl)pyrimidin-5-yl]-3-methylbut-2-enoate

→

2-[2-(1,1-dimethylethyl)pyrimidin-5-yl]-3-methylbut-2-enoic acid

Lösungsmittel

isopropanol

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigereaction mixture
2. 2
   Einengenwas concentrated by evaporation of the solvent under reduced pressure
3. 3
   workup.DISSOLUTIONthe residue was dissolved in water
4. 4
   Extraktionextracted with ethyl acetate
5. 5
   Extraktionextracted with ethyl acetate
6. 6
   WaschenThe combined organic extracts were washed with water
7. 7
   Trocknendried over anhydrous magnesium sulphate
8. 8
   Einengenconcentrated by evaporation of the solvent under reduced pressure

Vorschrift

A solution of sodium hydroxide 0.24 g) and ethyl 2-[2-(1,1-dimethylethyl)pyrimidin-5-yl]-3-methylbut-2-enoate (0.4 g) in isopropanol (10 cm3) and water (2 cm3) was heated to the reflux temperature for a period of 3 hours. After cooling to the ambient temperature the crude reaction mixture was concentrated by evaporation of the solvent under reduced pressure, and the residue was dissolved in water, and extracted with ethyl acetate. The aqueous portion was acidified with dilute hydrochloric acid, and extracted with ethyl acetate. The combined organic extracts were washed with water, dried over anhydrous magnesium sulphate and concentrated by evaporation of the solvent under reduced pressure to give 2-[2-(1,1-dimethylethyl)pyrimidin-5-yl]-3-methylbut-2-enoic acid, containing a small amount of 2-[2-(1,1-dimethylethyl)pyrimidin-5-yl]-3-methylbut-3-enoic acid. The crude produce was used without further purification.

Quelle