反应详情

温度

-78 °C

2-[2-(4-Fluorophenyl)acetyl]-4-oxo-pyrazolidine-1-carboxylic acid benzyl ester, 11, (1.0 g, 2.81 mmol) is dissolved in THF (30 mL) and the solution cooled to −78° C. A S 5.0M solution of borane-dimethyl sulfide complex in ether (1.2 mL, 5.61 mmol) is added dropwise. After 1 hour at −78° C., the reaction is quenched by slow addition of NH4Cl (sat. aq.) (10 mL). The cooling bath is then removed, and the mixture allowed to warm to room temperature with vigorous stirring. The THF is removed in vacuo and the residue diluted with water (50 mL) The mixture is extracted with ethyl acetate (2×100 mL), dried, filtered and concentrated in vacuo to give a yellow oil which is purified over silica (1:1 to 1:2 hexane/ethyl acetate to 100% ethyl acetate) to afford 731 mg (73% yield) as a clear, viscous oil.

1. customthe reaction is quenched by slow addition of NH4Cl (sat. aq.) (10 mL)
2. customThe cooling bath is then removed
3. temperatureto warm to room temperature with vigorous stirring
4. customThe THF is removed in vacuo
5. additionthe residue diluted with water (50 mL) The mixture
6. extractionis extracted with ethyl acetate (2×100 mL)
7. customdried
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. customto give a yellow oil which
11. customis purified over silica (1:1 to 1:2 hexane/ethyl acetate to 100% ethyl acetate)
12. customto afford 731 mg (73% yield) as a clear, viscous oil