反应详情

温度

-78 °C

n-Butyllithium (2.5 M in hexanes; 12.11 mL, 30.26 mmol) was added dropwise to a cooled (−78° C.) solution of piperidin-2-one (2.50 g, 25.22 mmol) in THF (100 mL). The mixture was stirred at −78° C. for 2.5 h. A solution of benzyl chloroformate (7.20 mL, 50.44 mmol) in THF (30 mL) was added dropwise. The mixture was stirred at −78 PC for 2 h and then was allowed to warm to rt. Water was added (200 and the mixture was extracted with EtOAc (3×100 mL). The combined organics were washed with brine, dried (Na2SO4), and concentrated to dryness to afford 4.13 g (70%) of the desired product. ES-MS m/z 233.91 [M+H]+, HPLC RT (min) 2.76.

1. stirringThe mixture was stirred at −78 PC for 2 h
2. temperatureto warm to rt
3. extractionthe mixture was extracted with EtOAc (3×100 mL)
4. washThe combined organics were washed with brine
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated to dryness