反应详情

温度

-78 °C

LDA (2.0M, 7.7 mL, 16 mmol) is added to a solution of tert-butyl 3-(2-methylpropyl)-2-oxo-1-(2-phenylethyl)-3-pyrrolidineacetate (EXAMPLE 1, step 3; 4.62 g, 12.9 mmol) and THF (45 mL) at -78° C. The solution is stirred at -78° C. for 45 minutes and allyl bromide (1.3 mL, 16 mmol) is added. The solution is allowed to warm to 0° C. over 2 hours, and is allowed to stir overnight at room temperature. After quenching with saturated aqueous ammonium chloride, aqueous workup (EtOAc, MgSO4) and purification by column chromatography (2:1:17 v/v EtOAc:CH2Cl2 :hexane) gives 4.43 g (86%) of the title compound as yellow oil which solidified upon standing (mp 54.5°-56° C.).

1. temperatureto warm to 0° C. over 2 hours
2. stirringto stir overnight at room temperature
3. customAfter quenching with saturated aqueous ammonium chloride, aqueous workup (EtOAc, MgSO4) and purification by column chromatography (2:1:17 v/v EtOAc:CH2Cl2 :hexane)