Allyl iodide → Allyl-(3,4-difluorophenyl)-carbamic acid-tert-butyl ester

Temperature

0 °C

To a solution of (3,4-difluorophenyl)-carbamic acid-tert-butyl ester (2.42 g, 10.55 mmol) in DMF (80 mL) at 0° C. under Ar was added NaH (60% dispersion in mineral oil, 0.805 g, 21 mmol, 2 eq.). The mixture was stirred at 0° C. for 30 min and then allyl iodide (6.42 mL, 53 mmol, 5 eq.) was added over 5 min. The mixture was warmed to room temperature and stirred for 2 h. The mixture was then diluted with EtOAc (100 mL) and washed with saturated aqueous NaHCO3 (100 mL). The aqueous phase was washed with EtOAc (3×60 mL) and the combined organic extracts were washed with saturated aqueous NaCl (100 mL), dried over Na2SO4, filtered and concentrated to give a brown oil which was purified by flash column chromatography by eluting with 10% EtOAc/hexanes to give allyl-(3,4-difluorophenyl)-carbamic acid-tert-butyl ester as a clear oil (2.238 g, 75%).). 1H NMR (300 MHz, CDCl3): δ 7.18 (m, 3H), 6.00 (m, 1H), 5.30 (m, 2H), 4.30 (m, 2H), 1.59 (s, 9H).

1. temperatureThe mixture was warmed to room temperature
2. stirringstirred for 2 h
3. washwashed with saturated aqueous NaHCO3 (100 mL)
4. washThe aqueous phase was washed with EtOAc (3×60 mL)
5. washthe combined organic extracts were washed with saturated aqueous NaCl (100 mL)
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated
9. customto give a brown oil which
10. customwas purified by flash column chromatography
11. washby eluting with 10% EtOAc/hexanes

ORD record

ord-5b99fa0935d0435abbaef0e3a2dba1e1

Source dataset

uspto-grants-2005_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06887889B2