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

HRID 618696Notes

Reaction equation

HRID 618696 reaction equation
[O:1]=[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[C:4](=[O:11])[N:3]1[CH:12]1[CH2:17][CH2:16][C:15](=[O:18])[N:14](C(OC(C)(C)C)=O)[C:13]1=[O:26].CN(C)CCN(C)C.C([Li])CCC.C1C=CC(S(N(S(C2C=CC=CC=2)(=O)=O)[F:50])(=O)=O)=CC=1>O1CCCC1>[O:1]=[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[C:4](=[O:11])[N:3]1[C:12]1([F:50])[CH2:17][CH2:16][C:15](=[O:18])[NH:14][C:13]1=[O:26]

Participants

6

Reactant 4

HCID 8037N,N,N',N'-TetramethylethylenediamineHCID 588007N-FluorobenzenesulfonimideHCID 15408802Tert-butyl 3-(1,3-dioxoisoindolin-2-yl)-2,6-dioxopiperidine-1-carboxylateHCID 178418339Butyllithium

Product 1

HCID 98820501,3-Dioxo-2-(2,6-dioxo-3-fluoropiperidin-3-yl)isoindoline

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a stirred solution of 1,3-dioxo-2-(1-tert.-butoxycarbonyl-2,6-dioxopiperidin-3-yl)isoindoline (1.0 g, 2.8 mmol) and tetramethylethylene diamine (0.5 g, 4.3 mmol) in tetrahydrofuran (10 mL) is added n-butyl lithium (1.2 mL, 3.0 mmol, 2.5 M) at -78° C. After 30 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 1N 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 column chromatography.

Workup

  1. customto reach room temperature
  2. customthe solvent then removed in vacuo
  3. customThe organic layer is separated
  4. customthe solvent removed in vacuo

Sources & evidence

ORD record
ord-c1ec3a7b54954090bd1adc9ac32efa53
Source dataset
uspto-grants-1999_09
Patent number
US05955476

Reaction notes

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