Hydrochloric Acid → 3-Bromo-6-fluoro-2-methoxybenzaldehyde

Temperature

-78 °C

To a solution of diisopropylamine (6.89 g, 9.6 mL, 68.3 mmol) in THF (100 mL) at −78° C. was added n-butyl lithium (33.5 mL of 1.6 M solution in hexane, 53.6 mmol) over 3 mins. After stirring at −78° C. for 10 mins, 2-bromo-5-fluoroanisole (10 g, 48.8 mmol) in THF (20 mL) was added dropwise over 15 mins. After completion of the addition, the mixture was stirred at −78° C. for 1 hr and then DMF (3.91 g, 4.12 mL, 53.6 mmol) was added dropwise over 3 mins and stirring was continued at −78° C. for 45 mins. Saturated NH4Cl solution was added and the mixture allowed to each room temperature. Diethyl ether and 2M HCl were added, the product was extracted into diethyl ether and the combined extracts were washed with brine, dried and evaporated. Chromatography on silica gel followed by trituration of the product with diethyl ether gave the title compound (D18) as a yellow solid (6.84 g)

1. additionAfter completion of the addition
2. stirringthe mixture was stirred at −78° C. for 1 hr
3. stirringstirring
4. waitwas continued at −78° C. for 45 mins
5. customallowed to each room temperature
6. extractionthe product was extracted into diethyl ether
7. washthe combined extracts were washed with brine
8. customdried
9. customevaporated

ORD record

ord-bff9e281e51a4109ba32680798eb73c7

Source dataset

uspto-grants-2011_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07960563B2