Reaktion #166095

Reaktionsgleichung

Methanol

cis-N-(6-benzhydryl-tetrahydropyran-3-yl)-2-(4-fluorophenyl)-acetamide

Cis-N-(6-benzhydryl-tetrahydro-pyran-3-yl)-2-(4-fluoro-phenyl)-acetamide

NaBH4

BF3.Et2O

→

Cis-(6-benzhydryl-tetrahydropyran-3-yl)-[2-(4-fluorophenyl)-ethyl]-amine

Ausbeute 81.0%

Lösungsmittel

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturcooled to 0° C
2. 2
   TemperaturThe mixture was refluxed overnight
3. 3
   Temperaturcooled to room temperature
4. 4
   Sonstigeto quench the reaction
5. 5
   Sonstigefollowed by removal of solvent in vacuo
6. 6
   workup.ADDITIONTo the residue was added 20 ml 10% HCl/MeOH
7. 7
   Temperaturthe mixture refluxed for 1 hour
8. 8
   TemperaturThe reaction mixture was cooled down to room temperature
9. 9
   workup.ADDITIONsolid NaHCO3 was added at 0° C. to pH 9
10. 10
    ExtraktionThe aqueous phase was extracted with dichloromethane (3×20 ml)
11. 11
    TrocknenThe combined organic phases were dried over anhydrous Na2SO4
12. 12
    Sonstigethe solvent was removed in vacuo

Vorschrift

Into a suspension of NaBH4 (0.21 g, 3.33 mmol) in dry THF (20 ml) was added BF3.Et2O drop wise at 0° C. The mixture was stirred for 1.5 Hours at room temperature and cooled to 0° C. A solution of cis-N-(6-benzhydryl-tetrahydropyran-3-yl)-2-(4-fluorophenyl)-acetamide 17 (0.17 g, 0.42 mmol) in dry THF (10 ml) was added dropwise into the solution. The mixture was refluxed overnight and cooled to room temperature. Methanol was added to quench the reaction followed by removal of solvent in vacuo. To the residue was added 20 ml 10% HCl/MeOH and the mixture refluxed for 1 hour. The reaction mixture was cooled down to room temperature and solid NaHCO3 was added at 0° C. to pH 9. The aqueous phase was extracted with dichloromethane (3×20 ml). The combined organic phases were dried over anhydrous Na2SO4, and the solvent was removed in vacuo. Flash chromatography gave 16p Cis-(6-benzhydryl-tetrahydropyran-3-yl)-[2-(4-fluorophenyl)-ethyl]-amine (0.13 g, yield 81%).

Quelle