反应详情

Under an argon atmosphere, to a solution of 2-chloro-3-nitro-5-(trifluoromethyl)pyridine (1 g) in 1,4-dioxane (15 mL) were added (6-(trifluoromethyl)pyridin-3-yl)boronic acid (925 mg), a solution of tricyclohexylphosphine in 15% toluene (2.0 mL), tris(dibenzylideneacetone)dipalladium (2.02 g) and a tripotassium phosphate aqueous solution (2 mol/L, 5.9 mL) and stirred overnight at 90° C. The reaction mixture was added with water and filtered through Celite® and the filtrate was extracted with ethyl acetate. The obtained organic layer was dried over anhydrous sodium sulfate and then concentrated under reduced pressure. The obtained residue was purified on silica gel column chromatography (hexane:ethyl acetate=85:15) to give the titled compound (1.15 g) having the following physical data.

1. filtrationfiltered through Celite®
2. extractionthe filtrate was extracted with ethyl acetate
3. dry with materialThe obtained organic layer was dried over anhydrous sodium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe obtained residue was purified on silica gel column chromatography (hexane:ethyl acetate=85:15)