Reaktion #78236

Reaktionsgleichung

4′-methoxy-N-methylacetanilide

lithium diisopropylamide

1-benzylpiperidin-4-one

diisopropylamine

n-butyl lithium

→

titled compound

Ausbeute 69.7%

N-(4-methoxyphenyl)-N-methyl-2-(1-benzyl-4-hydroxypiperidin-4-yl)acetamide

Ausbeute 69.7%

Lösungsmittel

water

tetrahydrofuran

tetrahydrofuran

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGthe resulting mixture was stirred at −78° C. for 10 minutes
2. 2
   TemperaturAfter increasing the temperature to room temperature
3. 3
   Extraktionthe mixed solution was extracted with ethyl acetate
4. 4
   WaschenThe organic layer was washed with water and saturated brine
5. 5
   Trocknendried over anhydrous sodium sulfate
6. 6
   workup.DISTILLATIONby distilling off the solvent under reduced pressure
7. 7
   SonstigeThe residue obtained
8. 8
   Sonstigewas recrystallized from ether-hexane

Vorschrift

A solution of 4′-methoxy-N-methylacetanilide (12 g) in an anhydrous tetrahydrofuran (30 mL) was added to a solution in an anhydrous tetrahydrofuran (100 mL) of lithium diisopropylamide prepared from diisopropylamine (10.5 mL) and n-butyl lithium (1.53M hexane solution; 48 mL) at below −65° C., and the mixture was stirred at −78° C. for 15 minutes. An anhydrous tetrahydrofuran solution (20 mL) of 1-benzylpiperidin-4-one (12.7 g) was then added to this reaction mixture at below −65° C., and the resulting mixture was stirred at −78° C. for 10 minutes. After increasing the temperature to room temperature, water was added to the mixture, and the mixed solution was extracted with ethyl acetate. The organic layer was washed with water and saturated brine and dried over anhydrous sodium sulfate, followed by distilling off the solvent under reduced pressure. The residue obtained was recrystallized from ether-hexane to obtain the titled compound (17.2 g).

Quelle