反应详情

A 1 M solution of tetrabutylammonium fluoride in tetrahydrofuran (1.73 mL) was added to a solution of 6-[(E)-1-(4-{[tert-butyl(dimethyl)silyl]oxy}-3-chlorophenyl)-2-cyclopentylethenyl]-3-ethyl-2-methoxypyridine (409 mg) in tetrahydrofuran (3 mL) under ice-boiling, and the mixture was stirred at room temperature for two hours. The reaction solution was poured into water and made acidic with 1 M hydrochloric acid, followed by extraction with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate and filtered. The solvent was then evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=10:1→1:1) to give 2-chloro-4-[(E)-2-cyclopentyl-1-(5-ethyl-6-methoxypyridin-2-yl)ethenyl]phenol as a yellow oil (306 mg, 99%).

1. extractionfollowed by extraction with ethyl acetate
2. washThe organic layer was washed with brine
3. dry with materialdried over anhydrous magnesium sulfate
4. filtrationfiltered
5. customThe solvent was then evaporated under reduced pressure
6. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=10:1→1:1)