Reaction #3423

Reaction equation

n-BuLi

di-isopropylamine

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

hexachloroethane

→

title compound

Yield 34.0%

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

Yield 34.0%

Solvents

THF

Conditions

Workup

1. 1
   Temperaturecooled to -78° C
2. 2
   TemperatureThe mixture was slowly warmed to room temperature
3. 3
   workup.STIRRINGstirred overnight
4. 4
   OtherThe reaction was quenched with 2N HCl
5. 5
   Washthe mixture was washed with Et2O
6. 6
   Extractionextracted with methylene chloride
7. 7
   Otherdried
8. 8
   Concentration(MgSO4) and concentrated
9. 9
   OtherThe residue was chromatographed (silica gel; CHCl3 /MeOH, 99:1)

Procedure

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)+.

Source