Reacción #3423

Ecuación de reacción

n-BuLi

di-isopropylamine

7a-(6-Fluoro-3-pyridinyl)-hexahydro-1H-pyrrolizine

hexachloroethane

→

title compound

Rendimiento 34.0%

7a-(5-chloro-6-fluoro-3-pyridinyl)-hexahydro-1H-pyrrolizine

Rendimiento 34.0%

Disolventes

THF

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturacooled to -78° C
2. 2
   TemperaturaThe mixture was slowly warmed to room temperature
3. 3
   workup.STIRRINGstirred overnight
4. 4
   OtroThe reaction was quenched with 2N HCl
5. 5
   Lavadothe mixture was washed with Et2O
6. 6
   Extracciónextracted with methylene chloride
7. 7
   Otrodried
8. 8
   Concentración(MgSO4) and concentrated
9. 9
   OtroThe residue was chromatographed (silica gel; CHCl3 /MeOH, 99:1)

Procedimiento

n-BuLi (2.5M in hexanes, 0.232 mL, 0.58 mmol) was added to di-isopropylamine (0.077 mL, 0.58 mmol) in THF and stirred at room temperature for 15 minutes, then cooled to -78° C. 7a-(6-Fluoro-3-pyridinyl)-hexahydro-1H-pyrrolizine (115 mg, 0.56 mmol, from Example 12d) and hexachloroethane (400 mg, 1.7 mmol) were added. The mixture was slowly warmed to room temperature and stirred overnight. The reaction was quenched with 2N HCl, and the mixture was washed with Et2O. The aqueous layer was basified with 15% NaOH and extracted with methylene chloride. The organic extracts were combined, dried, (MgSO4) and concentrated. The residue was chromatographed (silica gel; CHCl3 /MeOH, 99:1) to afford the title compound as an oil (45 mg, 34%): 1H NMR (CDCl3, 300 MHz) δ1.60-1.72 (m, 2H), 1.80-2.06 (m, 6H), 2.64-2.72 (m, 2H), 3.14-3.27 (m, 2H), 8.00 (dd, J=8.8, 2.0 Hz, 1H), 8.15 (dd, J=2.0, 1.0 Hz, 1H); MS (CI/NH3) m/z: 241 (M+H)+.

Fuente