反应详情

温度

-78 °C

Dissolve 2 g (6.7 mmol) cis-1-[4-(tert-butyl-dimethyl-silanyloxy)-cyclohexyl]-pyrrolidin-2-one (Preparation 69) in 40 mL of dry THF and cool to −78° C. Add 4 mL 2M LDA dropwise and continue stirring at −78° C. for 30 minutes. Allow the mixture to warm to −40° C. for 0.5 hour then re-cool to −78° C. Add a solution of 2.3 g (6.6 mmol) of the 5-benzyloxy-2-bromomethyl-1,3-dichloro-benzene (Preparation 70) in 20 mL dry THF dropwise, remove the cooling bath and stir the reaction at ambient temperature for 72 hours. Dilute the mixture with 100 mL saturated aqueous NaHCO3 and 50 mL EtOAc. Separate the layers, dry the organic layer with MgSO4 and concentrate under vacuum to an oil. Purify by chromatography using 80/20 Hex/EtOAc to recover 2.3 g (59%) of the title compound as an oil.

1. temperatureAllow the mixture to warm to −40° C. for 0.5 hour
2. temperaturethen re-cool to −78° C
3. customremove the cooling bath
4. stirringstir
5. customthe reaction at ambient temperature for 72 hours
6. customSeparate the layers
7. dry with materialdry the organic layer with MgSO4
8. concentrationconcentrate under vacuum to an oil
9. customPurify by chromatography
10. customto recover 2.3 g (59%) of the title compound as an oil