Reaktion #474030

Reaktionsgleichung

cyclopentanone

→

6-oxaspiro[4.5]decan-9-one

Ausbeute 18.0%

Lösungsmittel

2-butanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe solvent is evaporated off
2. 2
   TemperaturThe mixture is cooled to −78° C.
3. 3
   workup.ADDITION1.9 ml of acetyl chloride are added slowly
4. 4
   workup.STIRRINGThe mixture is stirred for 10 min at −78° C.
5. 5
   workup.ADDITIONby adding 100 ml of a saturated solution of ammonium chloride
6. 6
   ExtraktionThe resulting mixture is extracted with 200 ml of diethyl ether
7. 7
   Trocknendried over anhydrous sodium sulphate
8. 8
   SonstigeThe residue is chromatographed on silica gel (8/2 heptane/ethyl acetate)
9. 9
   workup.DISSOLUTIONThe residue is dissolved in 50 ml of methanol
10. 10
    workup.ADDITION200 mg of palladium-on-charcoal at 10% are added
11. 11
    workup.STIRRINGThe reaction mixture is stirred for 2 hours under a hydrogen atmosphere
12. 12
    FiltrationThe reaction mixture is filtered
13. 13
    Sonstigethe methanol is evaporated off

Vorschrift

At ambient temperature, 5 g of (E)-3-[(tert-butyl-dimethylsilanyloxy)buta-1,3-dienyl]dimethylamine are added to a solution of 3.9 g of cyclopentanone in 11 ml of 2-butanol. The reaction mixture is stirred for 18 h at ambient temperature. The solvent is evaporated off and then the residue is taken up in 100 ml of diethyl ether. The mixture is cooled to −78° C. and then 1.9 ml of acetyl chloride are added slowly. The mixture is stirred for 10 min at −78° C. and then the reaction is stopped by adding 100 ml of a saturated solution of ammonium chloride. The resulting mixture is extracted with 200 ml of diethyl ether, and the organic phases are combined, and then dried over anhydrous sodium sulphate. The residue is chromatographed on silica gel (8/2 heptane/ethyl acetate). The residue is dissolved in 50 ml of methanol, and then 200 mg of palladium-on-charcoal at 10% are added. The reaction mixture is stirred for 2 hours under a hydrogen atmosphere. The reaction mixture is filtered and then the methanol is evaporated off. 600 mg of 6-oxaspiro[4.5]decan-9-one are obtained. Yield=18%.

Quelle