反应详情

In 5 ml of N,N-dimethylformamide was dissolved 200 mg of methyl 2-(2,4-difluorophenylamino)-5-fluoro-6-hydroxynicotinate, and to the resulting solution were added 110 mg of potassium carbonate and 93 mg of dimethyl sulfate at room temperature, after which the resulting mixture was subjected to reaction at the same temperature for 2 hours. Subsequently, 20 ml of water and 20 ml of ethyl acetate were added to the reaction mixture, and the organic layer was then separated, washed successively with 10 ml of water and 10 ml of saturated aqueous sodium chloride solution, and thereafter dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure, and to the crystalline material thus obtained was added 5 ml of isopropyl alcohol, after which crystals were collected by filtration to obtain 180 mg (yield 86.0%) of methyl 2-(2,4-difluorophenylamino)-5-fluoro-6-methoxynicotinate. The physical properties of this compound were identical with those of the compound obtained in Example 2.

1. customafter which the resulting mixture was subjected to reaction at the same temperature for 2 hours
2. customthe organic layer was then separated
3. washwashed successively with 10 ml of water and 10 ml of saturated aqueous sodium chloride solution
4. dry with materialdried over anhydrous magnesium sulfate
5. customThe solvent was removed by distillation under reduced pressure
6. customto the crystalline material thus obtained
7. filtrationafter which crystals were collected by filtration