反应详情

To a stirred solution of 1-tert-butoxycarbonyl]-3-(4-nitro-1,3-dioxoisoindolin-2-yl)-2,6-dioxo-5-acetoxypiperidine (2.0 g, 4.3 mmol) in tetrahydrofuran (20 mL) is added sodium bis(trimethylsilyl)amide (4.3 mL, 4.3 mmol, 1.0 M) in tetrahydrofuran at −78° C. After 10-30 minutes, N-fluorobenzenesulfonimide (1.1 g, 4.3 mmol) is added to the mixture. The mixture is warmed to room temperature and the solvent is removed in vacuo. The residue is stirred with ethyl acetate (10 mL) and hydrochloric acid (10 mL, 1N) for 1 hour, the organic layer is separated, and the solvent is removed in vacuo to give 3-fluoro-3-(4-nitro-1,3-dioxoisoindolin-2-yl)-2,6-dioxo-5-acetoxypiperidine which is further purified by column chromatography.

1. customthe solvent is removed in vacuo
2. customthe organic layer is separated
3. customthe solvent is removed in vacuo