1-Bromo-3-chlorobenzene → HCID 67135368, compound

Participants

Reaction Steps

Palladium(II) acetate (90 mg, 0.40 mmol), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (460 mg, 0.80 mmol) and powdered potassium carbonate (5.5 g, 40 mmol) were combined in anhydrous 1,4-dioxane (20 mL), and the mixture was sparged with a subsurface stream of N2 gas for 10 min. 4-(2,4-Difluorophenyl)-1,3-dimethyl-1H-pyrazol-5-amine (i.e. the product of Step B) (0.89 g, 4.0 mmol) was added in one portion, and 1-bromo-3-chlorobenzene (0.47 mL, 4.0 mmol) was added via a syringe. The reaction mixture was heated at reflux under a nitrogen atmosphere for 3 h. Additional 1-bromo-3-chlorobenzene (0.09 mL, 0.8 mmol) was added, and heating was continued for 1 h. The reaction mixture was allowed to cool to room temperature, and then partitioned between water (40 mL) and ethyl acetate (40 mL). The organic phase was washed with additional water (40 mL), brine (40 mL), dried over MgSO4 and concentrated under reduced pressure. The residue was purified by column chromatography through 10 g of silica gel eluted with hexanes/ethyl acetate (1:1) to give the title compound, a compound of the present invention, as a solid (0.41 g).

Provenance & Evidence