Diisopropylamine → 7a-(5-bromo-6-fluoro-3-pyridinyl)-hexahydro-1H-pyrrolizine

n-BuLi (2.5M in hexanes, 0.252 mL, 0.63 mmol) was added to di-isopropylamine (0.082 mL, 0.63 mmol) in THF and stirred at room temperature for 10 minutes, then cooled to -78° C. 7a-(6-Fluoro-3-pyridinyl)-hexahydro-1H-pyrrolizine (123 mg, 0.60 mmol, from Example 12d) and 1,2-dibromo-1,1,2,2-tetrafluoroethane (0.215 mL, 1.80 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 (64 mg, 37%). 1H NMR (CDCl3, 300 MHz) δ1.59-1.71 (m, 2H), 1.79-2.06 (m, 6H), 2.64-2.72 (m, 2H), 3.12-3.19 (m, 2H), 8.14 (dd, J=8.8, 2.2 Hz, 1H), 8.19 (dd, J=2.2, 1.2 Hz, 1H); MS (CI/NH3) m/z: 285/287 (M+H)+.

1. temperaturecooled to -78° C
2. temperatureThe mixture was slowly warmed to room temperature
3. stirringstirred overnight
4. customThe reaction was quenched with 2N HCl
5. washthe mixture was washed with Et2O
6. extractionextracted with methylene chloride
7. customdried
8. concentration(MgSO4) and concentrated
9. customThe residue was chromatographed (silica gel; CHCl3 /MeOH, 99:1)

ORD 기록

ord-ac9c0ef6fceb47cd8829f6fc3aa7a252

출처 데이터셋

uspto-grants-1998_03

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US05733912