Reaktion #160016

Reaktionsgleichung

NaOH

1-Bromo-4-fluoro-benzene

n-butyllithium

8-benzyl-8-aza-bicyclo[3.2.1]octan-3-one

→

title compound

8-Benzyl-3-(4-fluoro-phenyl)-8-aza-bicyclo[3.2.1]octan-3-ol

Lösungsmittel

diethylether

diethylether

diethylether

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONis added quickly
2. 2
   TemperaturThe solution is warmed to −10° C. within 1 h
3. 3
   Sonstigethe reaction is quenched by the addition of aqueous NH4Cl solution
4. 4
   ExtraktionThe resulting mixture is extracted with ethyl acetate
5. 5
   Waschenthe combined extracts are washed with brine, and 4 M hydrochloric acid
6. 6
   workup.ADDITIONis added to the organic phase
7. 7
   SonstigeThe organic phase is separated from the aqueous phase
8. 8
   Sonstigean oily precipitation
9. 9
   Sonstigeformed
10. 10
    workup.ADDITIONafter the addition
11. 11
    Extraktionthe resulting mixture is extracted with ethyl acetate
12. 12
    TrocknenThe organic extracts are dried (Na2SO4)
13. 13
    Sonstigethe solvent is evaporated

Vorschrift

1-Bromo-4-fluoro-benzene (22.7 g) dissolved in diethylether (100 mL) is added to a solution of n-butyllithium (1.7 mol/L in pentane, 86.8 mL) in diethylether (200 mL) cooled to −35° C. The combined solutions are stirred at −35 to −40° C. for 1 h, before 8-benzyl-8-aza-bicyclo[3.2.1]octan-3-one (22.5 g) dissolved in diethylether (150 mL) is added quickly. The solution is warmed to −10° C. within 1 h and then the reaction is quenched by the addition of aqueous NH4Cl solution. The resulting mixture is extracted with ethyl acetate, the combined extracts are washed with brine, and 4 M hydrochloric acid is added to the organic phase. The organic phase is separated from the aqueous phase and an oily precipitation formed after the addition. The oily and aqueous phase are combined and basified with 4 M aqueous NaOH solution and the resulting mixture is extracted with ethyl acetate. The organic extracts are dried (Na2SO4) and the solvent is evaporated to give the title compound.

Quelle