Réaction #64852

Équation de réaction

K2HPO4

O2

K2HPO4

K2HPO4

tert.butyl 6-(2-methylidene-6,6-dimethyl-3-chlorocyclohex-1-yl)-4-oxo-hexanoate

→

tert.butyl 2-[5,5-dimethyl-2-oxo-2,3,4,4a,5,6,7,8-octahydronaphth-1-yl]acetate

Rendement 52.3%

Solvants

H2O

water

methanol

Conditions de réaction

Traitement

1. 1
   Températurecooled to -70°
2. 2
   Autrefor 1 hour
3. 3
   Autre45 minutes
4. 4
   Autrefitted with a stirrer
5. 5
   Autrethermometer, condenser and dropping
6. 6
   workup.ADDITIONThe cold ozonization mixture was rapidly added dropwise
7. 7
   Températurethe resulting grey suspension was heated
8. 8
   Températureunder reflux
9. 9
   Températurethe mixture was heated
10. 10
    Températureunder reflux
11. 11
    Températureto cool
12. 12
    Autrethe phases were separated
13. 13
    ExtractionThe aqueous phase was extracted 3 times with hexane
14. 14
    LavageThe combined organic phases were washed neutral 3 times with saturated NaCl solution
15. 15
    Séchagedried over MgSO4
16. 16
    Autreevaporated

Mode opératoire

190 g (0.55 mol) of tert.butyl 6-(2-methylidene-6,6-dimethyl-3-chlorocyclohex-1-yl)-4-oxo-hexanoate was dissolved in 1.7 l of methanol in a gasification flask, cooled to -70° and ozonized (O2 flow=200 l/h) for 1 hour and 45 minutes. 108 g (1.65 mol) of CuSO4 -activated zinc powder, 200 ml of deionized water and 150 ml of a solution of 115 g of K2HPO4 in 300 ml of H2O was placed in a 4 l four-necked flask fitted with a stirrer, thermometer, condenser and dropping funnel. The cold ozonization mixture was rapidly added dropwise and the resulting grey suspension was heated under reflux. After 17 hours the remainder of the K2HPO4 solution was added and the mixture was heated under reflux. After 4 days the pH value of the mixture was adjusted with saturated K2HPO4 solution to ~7, after 5 days to pH 7.5 and after 6 days to pH 8. After a total of 11 days the grey mixture was left to cool and the phases were separated. The aqueous phase was extracted 3 times with hexane. The combined organic phases were washed neutral 3 times with saturated NaCl solution, dried over MgSO4 and evaporated. 84.17 g of tert.butyl 2-[5,5-dimethyl-2-oxo-2,3,4,4a,5,6,7,8-octahydronaphth-1-yl]acetate was obtained as a yellow oil.

Source