反应详情

A solution of lithiumhexamethyldisilazide in tetrahydrofuran (1 M, 5.5 mL) was added to a solution of (cyclopentylmethyl)triphenylphosphonium iodide (1.73 g, 3.66 mmol) in tetrahydrofuran (5 mL) in a nitrogen atmosphere under ice-cooling, and the mixture was stirred under ice-cooling for one hour. A solution of (6-methoxy-5-methylpyridin-2-yl)[4-(methylsulfanyl)phenyl]methanone obtained in Reference Example 1-36 (1.0 g) in tetrahydrofuran (2.5 mL) was added to the reaction solution under ice-cooling, and the mixture was stirred at room temperature for 16 hours. Water was added to the reaction solution, followed by extraction with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate and then filtered. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (chloroform:hexane=1:9→1:2) to give (Z)-6-{2-cyclopentyl-1-[4-(methylsulfanyl)phenyl]ethenyl}-2-methoxy-3-methylpyridine (493 mg, 40%) as a more polar product.

1. temperaturecooling
2. temperaturecooling for one hour
3. additionwas added to the reaction solution under ice-
4. temperaturecooling
5. stirringthe mixture was stirred at room temperature for 16 hours
6. extractionfollowed by extraction with ethyl acetate
7. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
8. filtrationfiltered
9. customThe solvent was evaporated under reduced pressure
10. customThe residue was purified by silica gel column chromatography (chloroform:hexane=1:9→1:2)