反应详情

To a solution of tert-butyl(4-bromophenyl)carbamate (1.5 g) in tetrahydrofuran (30 mL) was added dropwise n-butyllithium (1.6 M hexane solution, 7.2 mL) at −78° C. under nitrogen atmosphere, and the mixture was stirred at the same temperature for 1 hr. Dihydro-2H-pyran-4(3H)-one (0.58 g) was added thereto, and the mixture was stirred overnight while it was allowed to be warmed. To the reaction mixture was added saturated aqueous ammonium chloride solution, and the mixture was extracted with ethyl acetate. The obtained organic layer was washed with saturated brine, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate) to give the title compound (590 mg).

1. stirringthe mixture was stirred overnight while it
2. temperatureto be warmed
3. extractionthe mixture was extracted with ethyl acetate
4. washThe obtained organic layer was washed with saturated brine
5. dry with materialdried over anhydrous magnesium sulfate
6. customthe solvent was evaporated under reduced pressure
7. customThe residue was purified by silica gel column chromatography (hexane/ethyl acetate)