Potassium Carbonate → HCID 46871835, compound

Participants

Reaction Steps

5-Bromo-4-(2,6-difluoro-4-methoxyphenyl)-1,3-dimethyl-1H-pyrazole (i.e. the product of Step D) (0.30 g, 0.94 mmol), palladium(II) acetate (20 mg, 0.090 mmol), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (0.11 g, 0.19 mmol) and powdered potassium carbonate (2.6 g, 19 mmol) were combined in anhydrous 1,4-dioxane (4 mL), and the resulting mixture was sparged with a subsurface stream of N2 gas for 10 min. 2,4,6-Trifluoroaniline (0.28 g, 1.9 mmol) was added in one portion, and the reaction mixture was heated at reflux under nitrogen for 22 h. The reaction mixture was cooled, then filtered through Celite® diatomaceous filter aid. The filter pad was washed with ethyl acetate (20 mL), and the filtrate was washed with water (10 mL) and brine (10 mL), dried over MgSO4, and concentrated to leave a semisolid residue. The residue was purified by column chromatography through 12 g of silica gel eluted with a gradient of hexanes/ethyl acetate (20:1 to 1:3) to give the title compound as a semisolid (73 mg).

Provenance & Evidence