Lithium Chloride → 2-Fluoro-4-[5-[4-(1,3-thiazol-4-yl)-3-(trifluoromethyl)phenyl]-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide

To a stirred solution of 2-fluoro-4-[5-[4-bromo-3-(trifluoromethyl)phenyl]-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide (308 mg, 0.58 mmol) in dioxane (5 ml) was added 4-(tributylstannyl)thiazole (260 mg, 0.70 mmol), tetrakis(triphenylphosphine)palladium (67 mg, 0.058 mmol), lithium chloride (61 mg, 1.45 mmol), and the mixture was heated at reflux temperature for 16 hours. The reaction mixture was cooled down to room temperature, and diluted with ethyl acetate. The whole was washed with saturated potassium fluoride aqueous solution, and the precipitate was removed by filteration through celite. The resulting solution was extracted with ethyl acetate. The organic layer was washed with brine, dried over MgSO4, and concentrated in vacuo. The residue was purified by flash chromatography eluting with ethyl acetate-hexane (1:2) to give title compound (56 mg, 18% yield).

1. temperaturethe mixture was heated
2. temperatureat reflux temperature for 16 hours
3. washThe whole was washed with saturated potassium fluoride aqueous solution
4. customthe precipitate was removed by filteration through celite
5. extractionThe resulting solution was extracted with ethyl acetate
6. washThe organic layer was washed with brine
7. dry with materialdried over MgSO4
8. concentrationconcentrated in vacuo
9. customThe residue was purified by flash chromatography
10. washeluting with ethyl acetate-hexane (1:2)

ORD record

ord-430cc9d32ab5462ea814ad2aabf19fda

Source dataset

uspto-grants-2003_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06608095B2