Dimethylformamide → 4-Bromo-2,5-difluorobenzaldehyde

Temperatur

-78 °C

n-Butyl lithium (3.6 ml, 7.7 mmol) was added drop wise to a solution of 1,4-dibromo-2,5-difluoro-benzene (2 g, 7.35 mmol) in dry ether at −78° C. under nitrogen atmosphere and the resulting mixture was stirred at −78° C. for 30 minutes. This was followed by the addition of DMF (0.85 ml, 11.03 mmol) in dry THF. The resultant was stirred at room temperature for 1 hour. The reaction was monitored by TLC (5% ethyl acetate in hexane). The reaction mixture was partitioned between ethyl acetate and saturated ammonium chloride. The organic layer was concentrated and purified by column chromatography on silica gel (2% ethyl acetate in hexane) to afford 600 mg of the product (37% yield).

1. stirringThe resultant was stirred at room temperature for 1 hour
2. customThe reaction mixture was partitioned between ethyl acetate and saturated ammonium chloride
3. concentrationThe organic layer was concentrated
4. custompurified by column chromatography on silica gel (2% ethyl acetate in hexane)

ORD-Eintrag

ord-5f194aae72294b5c9d42b853a801076a

Quelldatensatz

uspto-grants-2015_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09029399B2