反应详情

In 20 ml of N,N-dimethylformamide was dissolved 1.00 g of ethyl 1-(2,4-difluorophenyl)-6-fluoro-1,4-dihydro-7-hydroxy-4-oxo-1,8-naphthyridine-3-carboxylate, and 570 mg of potassium carbonate and 520 mg of dimethyl sulfate were added thereto at room temperature, after which the resulting mixture was subjected to reaction at the same temperature for 4 hours. To the reaction mixture were added 50 ml of water and 50 ml of ethyl acetate, and the organic layer was separated, washed successively with 100 ml of water and 20 ml of saturated aqueous sodium chloride solution, and then 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 diethyl ether, after which crystals were collected by filtration to obtain 950 mg (yield 91.5%) of ethyl 1-(2,4-difluorophenyl)-6-fluoro-1,4-dihydro-7-methoxy-4-oxo-1,8-naphthyridine-3-carboxylate. The physical properties of this compound were identical with those of the compound obtained in Example 41.

1. additionwere added
2. customat room temperature, after which the resulting mixture was subjected to reaction at the same temperature for 4 hours
3. customthe organic layer was separated
4. washwashed successively with 100 ml of water and 20 ml of saturated aqueous sodium chloride solution
5. dry with materialdried over anhydrous magnesium sulfate
6. customThe solvent was removed by distillation under reduced pressure
7. customto the crystalline material thus obtained
8. filtrationafter which crystals were collected by filtration