反应详情

A solution of N-methylpyrrolidone (0.7 mL) in tetrahydrofuran (3 mL) was stirred at −78° C. in a nitrogen atmosphere, during which a lithium diisopropylamide solution (2.2 M, 0.5 mL) was added dropwise thereto. The mixture was stirred at the same temperature for 30 minutes. A solution of 6-[(1E)-3-bromo-1-(4-tert-butylphenyl)prop-1-en-1-yl]-3-chloro-2-methoxypyridine (182 mg) in tetrahydrofuran (2 mL) was slowly added dropwise thereto, and the mixture was stirred at −78° C. for one hour. Water was added to the reaction solution, which was then warmed to room temperature and extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate and filtered, after which the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1→0:10) to give 3-[(2E)-3-(4-tert-butylphenyl)-3-(5-chloro-6-methoxypyridin-2-yl)prop-2-en-1-yl]-1-methylpyrrolidin-2-one as a colorless oil (176 mg, 93%).

1. additionwas added dropwise
2. stirringthe mixture was stirred at −78° C. for one hour
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed with brine
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. customafter which the solvent was evaporated under reduced pressure
8. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1→0:10)