Réaction #3423

Équation de réaction

n-BuLi

di-isopropylamine

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

hexachloroethane

→

title compound

Rendement 34.0%

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

Rendement 34.0%

Solvants

THF

Conditions de réaction

Traitement

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

Mode opératoire

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