Réaction #1797505

Équation de réaction

sodium methoxide

6-Methoxy-6-methyl-2-octanone

tert.-butyl methyl ether

methyl chloroacetate

→

3-(4-methoxy-4-methyl-hexyl)-3-methyl-oxirane-2-carboxylic acid methyl ester

Rendement 67.5%

Solvants

acetic acid

Conditions de réaction

Traitement

1. 1
   Autrethe phases were separated
2. 2
   ExtractionThe aqueous phase was extracted with tert.-butyl methyl ether (500 ml)
3. 3
   LavageThe combined organic phases were washed with water, concentrated KHCO3 solution, concentrated NaCl solution
4. 4
   Séchagedried over MgSO4
5. 5
   Autreafter the removal of the solvent
6. 6
   workup.DISTILLATIONwas distilled over a small Vigreux-column

Mode opératoire

860 g 6-Methoxy-6-methyl-2-octanone, 4 l tert.-butyl methyl ether and 648 g methyl chloroacetate were cooled to 0° C. under a blanket of nitrogen. Under further cooling, 350 g sodium methoxide was added in 6 portions over 20 minutes. The mixture was then stirred at room temperature till no more consumption of the ketone was observed (GC). After cooling to 0° C., 1 l 5% acetic acid (w/w) was added and the phases were separated. The aqueous phase was extracted with tert.-butyl methyl ether (500 ml). The combined organic phases were washed with water, concentrated KHCO3 solution, concentrated NaCl solution and dried over MgSO4. The yellow oil which remained after the removal of the solvent was distilled over a small Vigreux-column to give 823 g of 3-(4-methoxy-4-methyl-hexyl)-3-methyl-oxirane-2-carboxylic acid methyl ester (mixture of isomers, boiling point: 115°-128°/0.3 Torr=0.399 mbar).

Source