N-Fluorobenzenesulfonimide → 1,3-Dioxo-2-(2,6-dioxo-3-fluoropiperidin-3-yl)isoindoline

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Reaction Steps

To a stirred solution of 1,3-dioxo-2-(1-tert.-butoxycarbonyl-2,6-dioxopiperidin-3-yl)isoindoline (1.0 g, 2.8 mmol) in tetrahydrofuran (10 mL) is added n-butyl lithium (1.2 mL, 3.0 mmol, 2.5M) at -78° C. After 20 minutes, N-fluorobenzenesulfonimide (0-8 g, 3.2 mmol) is added to the mixture. The mixture is allowed to reach room temperature and the solvent then removed in vacuo. The residue is stirred with ethyl acetate (10 mL) and IN hydrochloric acid (10 mL) for one hour. The organic layer is separated and the solvent removed in vacuo to yield 1,3-dioxo-2-(2,6-dioxo-3-fluoropiperidin-3-yl)isoindoline which can be further purified through chromatography.

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