Reaktion #40577

Reaktionsgleichung

diisopropylamine

methyl 2-(4-chlorophenyl)-2-cyclopentylacetate

methyl iodide

→

methyl 2-(4-chlorophenyl)-2-cyclopentylpropionate

Lösungsmittel

ammonium chloride

THF

n-butyl lithium

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGAfter 15 minutes' stirring
2. 2
   SonstigeThe reaction liquid temperature
3. 3
   Temperaturwas raised to 0° C.
4. 4
   workup.STIRRINGthe liquid was stirred for 1.5 hours
5. 5
   Extraktionextracted with diethyl ether
6. 6
   WaschenThe organic layer was washed with saturated brine
7. 7
   Trocknendried over anhydrous sodium sulfate and condensed under reduced pressure
8. 8
   SonstigeThe resulting residue was purified on silica gel column chromatography (hexane/ethyl acetate 60/1)

Vorschrift

To a solution of diisopropylamine (0.15 ml) in THF (2 ml), n-butyl lithium (1.5 M hexane solution, 0.6 ml) was added at −78° C., stirred for 10 minutes and another solution of methyl 2-(4-chlorophenyl)-2-cyclopentylacetate (200 mg) in THF (1.5 ml) was added dropwise. After 15 minutes' stirring, the system temperature was raised to −35° C., and methyl iodide (0.15 ml) was added. The reaction liquid temperature was raised to 0° C., and the liquid was stirred for 1.5 hours, diluted with saturated aqueous ammonium chloride solution and extracted with diethyl ether. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate and condensed under reduced pressure. The resulting residue was purified on silica gel column chromatography (hexane/ethyl acetate 60/1) to provide methyl 2-(4-chlorophenyl)-2-cyclopentylpropionate (180 mg) as yellow oily substance.

Quelle