反应详情

To a stirred solution of 4-bromo-1-naphthalenecarboxylate oxime (i.e. the product from Step A) (2.33 g, 9.3 mmol) in N,N-dimethylformamide (6.0 mL) was added N-chlorosuccinimide (1.70 g, 12.7 mmol). The reaction mixture was stirred for 1 h at room temperature, and then a solution of 1,3-dichloro-5-[1-(trifluoromethyl)ethenyl]benzene (i.e. the product from Step B of Example 1) (2.70 g, 11.2 mmol) and triethylamine (4.5 mL, 32.0 mmol) in N,N-dimethylformamide (9.0 mL) was added. After stirring for additional 2 h at room temperature, the reaction mixture was diluted with water and extracted with ethyl acetate. The organic layer was washed with brine, dried (Na2SO4), and concentrated under reduced pressure. The residue was purified by silica gel column chromatography using hexanes/ethyl acetate as eluent to afford the title compound as a white solid (2.9 g, 64% yield).

1. stirringAfter stirring for additional 2 h at room temperature
2. extractionextracted with ethyl acetate
3. washThe organic layer was washed with brine
4. dry with materialdried (Na2SO4)
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by silica gel column chromatography