反应详情

To a solution of 0.840 g (4.59 mmol) of 4-cyano-2,3-difluorobenzoic acid in 10 ml of dichloromethane were added one drop of DMF and 0.470 ml (5.51 mmol) of oxalyl chloride, followed by stirring at room temperature for 1 hour. The solvent was evaporated under reduced pressure and the obtained 4-cyano-2,3-difluorobenzoyl chloride was added to a solution of 1.56 g (3.83 mmol) of 2-bromo-4-(perfluoropropan-2-yl)-6-(trifluoromethyl)aniline obtained in 1-2 of Example 1 in 5 ml of DMI, followed by stirring at 130° C. for 5 hours. To the reaction liquid were added water and ethyl acetate, and the organic layer was washed with a saturated aqueous sodium hydrogen carbonate solution and saturated brine, and then dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure and the obtained residue was purified by silica gel column chromatography (eluent solvent; hexane:ethyl acetate=1:0→10:1) to prepare 0.58 g (yield 27%) of a target compound.

1. customThe solvent was evaporated under reduced pressure
2. stirringby stirring at 130° C. for 5 hours
3. customTo the reaction liquid
4. washthe organic layer was washed with a saturated aqueous sodium hydrogen carbonate solution and saturated brine
5. dry with materialdried over anhydrous magnesium sulfate
6. customThe solvent was evaporated under reduced pressure
7. customthe obtained residue was purified by silica gel column chromatography (eluent solvent; hexane:ethyl acetate=1:0→10:1)