Dimethylformamide → 5-Bromo-2,4-difluorobenzaldehyde

Temperature

-78 °C

To a solution of 1,5-dibromo-2,4-difluorobenzene (17.5 g, 64.2 mmol) in ether (100 mL) at −78° C. was added n-BuLi (2.5 M solution, 30.8 mL, 77 mmol) over a period of 5 min, and the reaction mixture was stirred at −78° C. for 30 min. Then DMF (9.94 mL, 148 mmol) was added in one portion, and the mixture was stirred at −78° C. for 30 min. The reaction mixture was worked up with EtOAc/sat. NH4Cl, and the crude product was purified by silica gel chromatography eluting with 0-10% EtOAc/Hexanes to give the title compound as a slightly yellow oil (8.5 g, 60% yield). 1H NMR (400 MHz, CHLOROFORM-d) δ 10.26 (s, 1H), 8.14 (t, J=7.5 Hz, 1H), 7.05 (dd, J=9.8, 8.0 Hz, 1H).

1. stirringthe mixture was stirred at −78° C. for 30 min
2. customNH4Cl, and the crude product was purified by silica gel chromatography
3. washeluting with 0-10% EtOAc/Hexanes

ORD record

ord-5ab7a5179d86488f8ca674db1b8a3ded

Source dataset

uspto-grants-2013_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08598161B2