Sodium hydride → Ethyl 2-(5-bromo-2-oxopyridin-1(2H)-yl)propanoate

Temperature

0 °C

To a solution of 5-bromo-2(1H)-pyridone (7.8 g, 45 mmol) in 80 mL of DMF at 0° C. was added sodium hydride (60% dispersion in mineral oil, 2.1 g, 90 mmol). The mixture was stirred at 0° C. for 45 minutes. Ethyl 2-bromopropionate (9.7 g, 54 mmol) was then added via a syringe. The reaction was warmed up to rt and let stir for 16 hours. The reaction mixture was then poured into an ice-HCl (2N) solution until pH˜2. The aqueous mixture was extracted with 2×100 mL of EtOAc. The combined organic phases were dried over Na2SO4 and concentrated in vacuo. The residue was chromatographed on a silica gel column (30% EtOAc/hexane to EtOAC) to give yellow oil (9.0 g, 73% yield) as desired product. MS (ESI pos. ion) m/z (MH+): 273.9. Calc'd Exact Mass for C10H12BrNO3: 273.00.

1. temperatureThe reaction was warmed up to rt
2. stirringlet stir for 16 hours
3. extractionThe aqueous mixture was extracted with 2×100 mL of EtOAc
4. dry with materialThe combined organic phases were dried over Na2SO4
5. concentrationconcentrated in vacuo
6. customThe residue was chromatographed on a silica gel column (30% EtOAc/hexane to EtOAC)

ORD record

ord-b0ddca0713ad4b91bd9c53627d016f61

Source dataset

uspto-grants-2012_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08314087B2