2,4-Difluorobenzaldehyde → HCID 66613811, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of 4-bromo-5-(2,6-difluorophenyl)-1,3-dimethyl-1H-pyrazole (i.e. the product of Step C) (500 mg, 1.7 mmol) in tetrahydrofuran (15 mL) at −78° C. was added dropwise n-butyllithium (2.0 M in hexanes, 0.76 mL, 1.9 mmol). The reaction mixture was stirred at −78° C. for about 20 minutes, and then a solution of 2,4-difluorobenzaldehyde (153 μL, 1.4 mmol) in tetrahydrofuran (1 mL) was added dropwise. After the addition was complete, the reaction mixture was stirred at about −78° C. for about 15 minutes, and then diluted with saturated aqueous ammonium chloride solution (1 mL) and allowed to warm to room temperature. The resulting mixture was poured onto a solid phase extraction tube (Varian Chem Elute®, prepacked with diatomaceous earth) eluting with ethyl acetate (50 mL). The ethyl acetate eluant was concentrated under reduced pressure and the resulting material was purified by MPLC (20 to 50% gradient of ethyl acetate in hexanes as eluant) to provide the title compound, a compound of the present invention, as a solid (560 mg).

Provenance & Evidence