反应详情

温度

40 °C

To a suspension of 3,3-diphenylpyrrolidin-2-one (2.00 g, 8.43 mmol; Example 1A) in tetrahydrofuran (10 mL) was added potassium 2-methylpropan-2-olate (9.27 mL, 9.27 mmol). After stirring for 30 minutes, the reaction was a suspension so the reaction was heated to 40° C. The reaction was cooled to ambient temperature, and then tert-butyl 4-bromobutanoate (2.068 g, 9.27 mmol) as a solution in tetrahydrofuran (3 mL) was added. The reaction was stirred for 3 hours, then poured into ethyl acetate/1 N HCl (1:1, 300 mL). The organic layer was separated, washed with brine (100 mL), dried over magnesium sulfate and concentrated. The residue was loaded onto a GraceResolv™ 40 g silica gel column (Grace Davison Discovery Sciences) and the product eluted with a gradient of 5% ethyl acetate/hexanes to 40% ethyl acetate/hexanes (Flow=40 mL/minute) over 30 minutes. The product was dissolved in 5 mL of dichloromethane then 5 mL of trifluoroacetic acid was added. After stirring for 3 hours, the reaction was concentrated to give the title compound. 1H NMR (300 MHz, CDCl3) δ 7.36-7.22 (m, 10H), 3.45 (m, 4H), 2.79 (t, J=6.5, 2H), 2.31 (t, J=7.1, 2H), 1.89 (p, J=7.0, 2H); MS (ESI+) m/z 324.0 (M+H)+.

1. temperatureThe reaction was cooled to ambient temperature
2. stirringThe reaction was stirred for 3 hours
3. customThe organic layer was separated
4. washwashed with brine (100 mL)
5. dry with materialdried over magnesium sulfate
6. concentrationconcentrated
7. washthe product eluted with a gradient of 5% ethyl acetate/hexanes to 40% ethyl acetate/hexanes (Flow=40 mL/minute) over 30 minutes
8. dissolutionThe product was dissolved in 5 mL of dichloromethane
9. addition5 mL of trifluoroacetic acid was added
10. stirringAfter stirring for 3 hours
11. concentrationthe reaction was concentrated