Lithium Chloride → 5-{4-Chloro-5-[4-(1,3-thiazol-4-yl)phenyl]-3-(trifluoromethyl)-1H-pyrazol-1-yl}-2-pyridinesulfonamide

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Reaction Steps

A mixture of 5-[5-(4-bromophenyl)-4-chloro-3-(trifluoromethyl)-1H-pyrazol-1-yl]-2-pyridinesulfonamide (236 mg, 0.489 mmol), 4-(tributylstannyl)-1,3-thiazole (238 mg, 0.636 mmol), lithium chloride (27 mg, 0.636 mmol) and tetrakis(triphenylphosphine)palladium (57 mg, 0.0489 mmol) in 1,4-dioxane (10 ml) was refluxed for 5 hr under nitrogen atmosphere. After evaporation, the residue obtained was chromatographed on a column of silica gel (50 g) eluting with ethyl acetate/hexane (3:4) to afford 200 mg (84%) of the title compound as a pale brown gum.

Provenance & Evidence