Reaktion #566185

Reaktionsgleichung

toluene

(S)-2-(3-chlorophenyl)-2-(3,4,5,6-tetrahydro-[2H]-pyran-2-yloxy)ethyl methanesulfonate

p-toluenesulfonic acid monohydrate

→

(S)-3-chlorostyrene Oxide

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   WaschenThe reaction mixture was Washed with a saturated aqueous sodium hydrogen carbonate solution
2. 2
   workup.ADDITIONTo the organic layer was added 20% NaOH (10 ml)
3. 3
   workup.STIRRINGthe resulting mixture was stirred vigorously at room temperature for 1 hour
4. 4
   SonstigeThe reaction mixture was subjected to layer separation
5. 5
   Waschenthe organic layer was washed with water
6. 6
   Trocknenwith a saturated aqueous sodium chloride solution and dried with anhydrous magnesium sulfate
7. 7
   FiltrationThe desiccant was filtered off
8. 8
   workup.DISTILLATIONthe solvent was distilled off
9. 9
   workup.DISTILLATIONthe resulting oily substance was distilled under reduced pressure
10. 10
    Sonstigeto obtain a colorless oily compound
11. 11
    SonstigeThe optical purity of the product obtained

Vorschrift

Into toluene (10 ml) were added (S)-2-(3-chlorophenyl)-2-(3,4,5,6-tetrahydro-[2H]-pyran-2-yloxy)ethyl methanesulfonate (3.0 g), p-toluenesulfonic acid monohydrate (1.7 g) and methanol (0.5 g), and the resulting mixture was:stirred at 50° C. for 1 hour. The reaction mixture was Washed with a saturated aqueous sodium hydrogen carbonate solution and then with a saturated aqueous sodium chloride solution. To the organic layer was added 20% NaOH (10 ml) and the resulting mixture was stirred vigorously at room temperature for 1 hour. The reaction mixture was subjected to layer separation, and the organic layer was washed with water, then with a saturated aqueous sodium chloride solution and dried with anhydrous magnesium sulfate. The desiccant was filtered off, then the solvent was distilled off, and the resulting oily substance was distilled under reduced pressure to obtain a colorless oily compound mentioned above (1.27 g, 91.7%). The optical purity of the product obtained was 99.9% e.e. as determined by HPLC.

Quelle