Reaktion #830903

Reaktionsgleichung

n-butyl lithium

1-benzyl-3-piperidone

2-(4-Bromophenyl)naphthalene

→

1-benzyl-3-hydroxy-3(4-naphth-2-yl-phenyl)piperidine

Ausbeute 53.5%

Lösungsmittel

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONis added dropwise with vigorous stirring
2. 2
   Temperaturto warm to room temperature
3. 3
   Sonstigequenched with saturated ammonium chloride (10 ml)
4. 4
   workup.ADDITIONThe mixture is diluted with ethyl acetate (500 ml)
5. 5
   Waschenwashed with water and brine
6. 6
   TrocknenThe organic layer is dried over MgSO4
7. 7
   Einengenconcentrated on a rotovap
8. 8
   SonstigeThe crude material is purified by silica gel flash column chromatography

Vorschrift

2-(4-Bromophenyl)naphthalene (9.29 g, 32.8 mmol) is placed in a round bottom flask under argon and dissolved in anhydrous THF (150 mL). The solution is cooled to -78° C. in a dry ice/acetone bath with stirring. A solution of n-butyl lithium (2.0M, 18.0 ml) is added dropwise and after fifteen minutes 1-benzyl-3-piperidone (8.14 g, 36.08 mmol) in 20 mL of THF is added dropwise with vigorous stirring. After 30 minutes the solution is allowed to warm to room temperature and quenched with saturated ammonium chloride (10 ml). The mixture is diluted with ethyl acetate (500 ml), washed with water and brine. The organic layer is dried over MgSO4 and concentrated on a rotovap. The crude material is purified by silica gel flash column chromatography using 30% ethyl acetate in hexane as the eluant to yield 6.91 g (48%) of 1-benzyl-3-hydroxy-3(4-naphth-2-yl-phenyl)piperidine as a white solid.

Quelle