Reaktion #2028901

Reaktionsgleichung

n-butyllithium

p-toluenesulfonyl chloride

THF

n-Butyllithium

THF

→

2-(trans-4-propyl-cyclohexyl)-oxetane

Ausbeute 70.0%

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeprepared in the third step in a reaction vessel under an atmosphere of nitrogen
2. 2
   workup.STIRRINGAfter the reaction mixture had been stirred for 30 minutes
3. 3
   Temperaturthe reaction mixture was heated slowly up to the reflux temperature
4. 4
   Sonstigequenched with a saturated aqueous solution of ammonium chloride
5. 5
   workup.ADDITIONwater (1,000 ml) was added
6. 6
   Sonstigeto give two layers
7. 7
   ExtraktionThe water layer was extracted with toluene (500 ml) three times
8. 8
   Waschenthe combined organic layer was washed with water
9. 9
   Trocknendried over anhydrous magnesium sulfate
10. 10
    workup.DISTILLATIONThe solvent was distilled off under reduced pressure
11. 11
    workup.ADDITIONThe residue was treated with silica gel chromatography (silica gel: 200 g, eluent: heptane/ethyl acetate=90/10 by volume)
12. 12
    workup.DISTILLATIONdistilled under reduced pressure (71 to 74° C., 3 mmHg)

Vorschrift

THF (1,000 ml) was added to 1-(trans-4-propyl-cyclohexyl)-propane-1,3-diol(4) (229.3 g) prepared in the third step in a reaction vessel under an atmosphere of nitrogen. n-Butyllithium (1.63 M in n-hexane; 702 ml) was added dropwise to the mixture at around −5° C. After 30 minutes of stirring, p-toluenesulfonyl chloride (218.2 g) in a THF (1,000 ml) solution was added dropwise. After the reaction mixture had been stirred for 30 minutes, n-butyllithium (1.63 M in n-hexane; 702 ml) was added dropwise at around −5° C., and then the reaction mixture was heated slowly up to the reflux temperature. After the evolution of gas had ceased, the reaction mixture was cooled to room temperature, and quenched with a saturated aqueous solution of ammonium chloride, and then water (1,000 ml) was added to give two layers. The water layer was extracted with toluene (500 ml) three times, and the combined organic layer was washed with water and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure. The residue was treated with silica gel chromatography (silica gel: 200 g, eluent: heptane/ethyl acetate=90/10 by volume) and distilled under reduced pressure (71 to 74° C., 3 mmHg) to give 2-(trans-4-propyl-cyclohexyl)-oxetane (5) (145 g) in 70% yield.

Quelle