反应详情

To a tetrahydrofuran solution (30 ml) of lithium diisopropylamide which was prepared from a 1.6 M n-butyllithium hexane solution (12.5 ml) and diisopropylamine (2.1 g), a tetrahydrofuran solution (10 ml) of 4-chloro-4'-methylmercaptomethylbenzophenone (2.8 g) was added at -78° C., and the mixture was stirred for 30 minutes at the same temperature. Ethyl iodide (3.0 g) was subsequently added thereto at -78° C., and the mixture was stirred for 6 hours while restoring the mixture gradually to room temperature. After completing the reaction, the reaction mixture was washed with aqueous 5% ammonium chloride solution and aqueous saturated sodium chloride solution, and dried over anhydrous magnesium sulfate. After distilling off the solvent, the obtained crude product was purified by silica gel column chromatography (developing solvent: n-hexane:ethyl acetate=4:1) to obtain 4-chloro-4'-(1-methylmercaptopropyl)benzophenone (0.3 g) as oily substance.

1. stirringat -78° C., and the mixture was stirred for 6 hours
2. customgradually to room temperature
3. customthe reaction
4. washthe reaction mixture was washed with aqueous 5% ammonium chloride solution and aqueous saturated sodium chloride solution
5. dry with materialdried over anhydrous magnesium sulfate
6. distillationAfter distilling off the solvent
7. customthe obtained crude product
8. customwas purified by silica gel column chromatography (developing solvent: n-hexane:ethyl acetate=4:1)