反应详情

温度

0 °C

Under a nitrogen atmosphere, to a suspension of calcium chloride (12.3 g) in ethanol (100 mL) and THF (50 ml) was added sodium tetrahydroborate (2.62 g) at 0° C., and the mixture was stirred at 0° C. for 10 min. To the reaction mixture was added a solution of methyl 6-chloro-5-(2-fluoro-5-methoxyphenyl)picolinate (8.30 g) in ethanol (25 ml) and THF (50 ml) at room temperature, and the mixture was stirred for 14 hr. 1N Hydrochloric acid was added to the reaction mixture, and the mixture was neutralized with aqueous sodium hydrogen carbonate solution. The reaction mixture was extracted with ethyl acetate, and the extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure to give the title compound (7.30 g) as a pale-gray amorphous solid. This compound was used for the next step without further purification.

1. stirringthe mixture was stirred for 14 hr
2. extractionThe reaction mixture was extracted with ethyl acetate
3. washthe extract was washed with saturated brine
4. dry with materialdried over anhydrous sodium sulfate
5. customThe solvent was evaporated under reduced pressure