反应详情

温度

110 °C

A suspension of (S)-tert-butyl 3-(4-bromo-2,5-difluorophenoxy)-2-oxo-1,4′-bipiperidine-1′-carboxylate (700 mg, 1.39 mmol), and sodium methanesulfinate (219 mg, 2.08 mmol) in DMSO (5.55 mL), was deoxygenated and purged with nitrogen. Cu(I) triflate benzene complex (77.6 mg, 0.139 mmol) and (1S,2S)-cyclohexane-1,2-diamine (63.4 mg, 0.555 mmol) were introduced and the heterogeneous mixture was sealed and heated to 110° C. in an oil bath and stirred for 18 hours. The mixture was cooled to ambient temperature, diluted with EtOAc (75 mL), washed with water (30 mL) and brine (three 50 mL washes), dried (Na2SO4), filtered and concentrated in vacuo. The residue was purified over silica gel (EtOAc) to afford (S)-tert-butyl 3-(2,5-difluoro-4-(methylsulfonyl)phenoxy)-2-oxo-1,4′-bipiperidine-1′-carboxylate (305 mg, 0.606 mmol, 44% yield) as a light yellow oil that solidified. Mass spectrum (apci) m/z=389.1 (M+H-Boc).

1. customwas deoxygenated
2. custompurged with nitrogen
3. customthe heterogeneous mixture was sealed
4. temperatureThe mixture was cooled to ambient temperature
5. washwashed with water (30 mL) and brine (three 50 mL washes)
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe residue was purified over silica gel (EtOAc)