反应详情

1-(2,5-dibromophenyl)-3-methyl-1H-pyrazole (23.0 g, 73 mmol) from Step 1 was dissolved in 200 mL of THF and cooled to 0° C. i-Propyl magnesium chloride (2.0 M in THF, 40 mL) was added dropwise and the reaction was stirred for 45 min, then ethyl trifluoroacetate (10.5 mL) was added. The reaction was stirred for 30 min at 0° C., then 10% HCl is added dropwise (400 mL). The reaction was extracted with water and EtOAc, washed with brine, dried over Na2SO4, filtered, and then concentrated in vacuo. Purification by normal phase silica gel column chromatography (EtOAc/heptane) provided 1-(4-bromo-2-(3-methyl-1H-pyrazol-1-yl)phenyl)-2,2,2-trifluoroethanone.

1. additionwas added dropwise
2. stirringThe reaction was stirred for 30 min at 0° C.
3. extractionThe reaction was extracted with water and EtOAc
4. washwashed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customPurification by normal phase silica gel column chromatography (EtOAc/heptane)