反应详情

温度

-20 °C

A solution of 1-(4-bromophenyl)cyclopropanecarboxylic acid (600.0 mg, 0.002489 mol) in tetrahydrofuran (20 mL, 0.2 mol) was cooled below −20 Celsius under N2 atmosphere, and 1.0 M of dibutylmagnesium in heptane (1.3 mL) was slowly added to the solution while maintaining the temperature below −20 Celsius. Then n-butyllithium (2.5 M in hexane, 1.1 mL) was slowly added to the slurry while maintaining the temperature below −20 Celsius with effective stirring. After the mixture was stirred at −20 Celsius for 1 hour, a solution of cyclopentanone (0.264 mL, 0.00299 mol) in THF (20.0 mL) was added to the mixture. Then after stirring at −20 Celsius for 1 hour, the reaction was quenched with ammonium chloride and the reaction mixture was extracted with ethyl acetate. The organic phase was washed with brine, then dried over Na2SO4, and then filtered. The filtrate was concentrated. The residue was flash chromatographed on silica gel column with 30% ethyl acetate in hexanes to afford the desired compound. MS (ESI): 229.1 (M−OH−), 269.1 (M+Na+).

1. temperaturewhile maintaining the temperature below −20 Celsius
2. temperaturewhile maintaining the temperature below −20 Celsius with effective stirring
3. stirringThen after stirring at −20 Celsius for 1 hour
4. customthe reaction was quenched with ammonium chloride
5. extractionthe reaction mixture was extracted with ethyl acetate
6. washThe organic phase was washed with brine
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationThe filtrate was concentrated
10. customchromatographed on silica gel column with 30% ethyl acetate in hexanes