Dimethylformamide → 2,4-dibromo-6-fluorobenzaldehyde

Participants

Reaction Conditions

Reaction Steps

In a flame-dried 250 mL round-bottomed flask equipped with an addition funnel and magnetic stirrer, a mixture of diisopropylamine (4.82 mL, 34.66 mmol) in 100 mL of anhydrous THF was cooled to −78° C. and treated with 2.5N n-butyllithium (13.86 mL, 34.66 mmol) in THF, dropwise. After stirring for 10 minutes a mixture of 3,5-dibromo-1-fluorobenzene (8.0 g, 31.51 mmol) in 16 mL of THF was added dropwise and stirring was continued for an additional 30 minutes. At this point, N,N-dimethylformamide (DMF) (2.68 mL, 34.66 mmol) was added dropwise and stirring continued another 10 minutes at −78° C. The reaction was quenched with saturated aqueous ammonium chloride and the solvent removed on a rotary evaporator. The residue was dissolved in ether, washed with saturated brine and dried over calcium sulfate, filtered and concentrated to an oil, 7.36 g. Purification by flash chromatography using ethyl acetate-hexanes (1:99) gave the title product as a white solid.

Provenance & Evidence