Réaction #7537

Équation de réaction

hydrochloric acid

3-[2-(3-chloropropoxy)ethyl]-1-benzothiophene

3-azetidinol trifluoroacetate

potassium carbonate

→

1-{3-[2-(1-benzothiophen-3-yl)ethoxy]propyl}-3-azetidinol

Rendement 48.1%

Solvants

dimethyl sulfoxide

ethyl acetate

water

Conditions de réaction

Traitement

1. 1
   workup.ADDITIONwere added to the solution
2. 2
   TempératureAfter the reaction mixture was cooled
3. 3
   Autrethe aqueous layer was separated
4. 4
   workup.ADDITIONEthyl acetate was added to the aqueous layer
5. 5
   Autreafter which the organic layer was separated
6. 6
   LavageThe organic layer was washed with water
7. 7
   Séchagea saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate
8. 8
   workup.DISTILLATIONdistilled under reduced pressure
9. 9
   Autreto remove the solvent
10. 10
    AutreThe residue was purified by a column chromatography (eluent; chloroform:methanol=30:1 to 10:1)

Mode opératoire

In 5 mL of dimethyl sulfoxide was dissolved 1.00 g of 3-[2-(3-chloropropoxy)ethyl]-1-benzothiophene, and 1.10 g of 3-azetidinol trifluoroacetate and 1.63 g of potassium carbonate were added to the solution, after which the resulting mixture was stirred at 70° C. for 2 hours. After the reaction mixture was cooled, water and ethyl acetate were added thereto and the pH was adjusted to 1 with 6 mol/L hydrochloric acid, and the aqueous layer was separated. Ethyl acetate was added to the aqueous layer and the pH was adjusted to 10 with a 2 mol/L aqueous sodium hydroxide solution, after which the organic layer was separated. The organic layer was washed with water and then a saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and then distilled under reduced pressure to remove the solvent. The residue was purified by a column chromatography (eluent; chloroform:methanol=30:1 to 10:1) to obtain 0.55 g of 1-{3-[2-(1-benzothiophen-3-yl)ethoxy]propyl}-3-azetidinol as a colorless oil.

Source