Cesium carbonate → tert-butyl 1-[2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)ethyl]-1H-pyrrole-3-carboxylate

HRID 450768Notes

Reaction equation

HRID 450768 reaction equation
[NH:1]1[CH:5]=[CH:4][C:3]([C:6]([O:8][C:9]([CH3:12])([CH3:11])[CH3:10])=[O:7])=[CH:2]1.Br[CH2:14][CH2:15][N:16]1[C:20](=[O:21])[C:19]2=[CH:22][CH:23]=[CH:24][CH:25]=[C:18]2[C:17]1=[O:26].C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C=O)C.O>[O:26]=[C:17]1[C:18]2[C:19](=[CH:22][CH:23]=[CH:24][CH:25]=2)[C:20](=[O:21])[N:16]1[CH2:15][CH2:14][N:1]1[CH:5]=[CH:4][C:3]([C:6]([O:8][C:9]([CH3:12])([CH3:11])[CH3:10])=[O:7])=[CH:2]1

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 113251H-Isoindole-1,3(2H)-dione, 2-(2-bromoethyl)-HCID 11171190tert-butyl 1H-pyrrole-3-carboxylate

Product 1

HCID 59478522tert-butyl 1-[2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)ethyl]-1H-pyrrole-3-carboxylateYield 12.6%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

To a solution of 2.62 g of tert-butyl 1H-pyrrole-3-carboxylate and 7.96 g of N-(2-bromoethyl)phthalimide in DMF (100 ml) was added 10.2 g of cesium carbonate at room temperature, followed by stirring for 12 hours. The reaction solution was diluted with water and extracted with ethyl acetate. The extract was washed with saturated brine and then dried over anhydrous magnesium sulfate. The organic layer was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography using hexane/chloroform as an eluent solvent, and washed with diethyl ether to obtain 670 mg of tert-butyl 1-[2-(1,3-dioxo-1,3-dihydro-2H-isoindo1-2-yl)ethyl]-1H-pyrrole-3-carboxylate as a colorless solid.

Workup

  1. extractionextracted with ethyl acetate
  2. washThe extract was washed with saturated brine
  3. dry with materialdried over anhydrous magnesium sulfate
  4. concentrationThe organic layer was concentrated under reduced pressure
  5. customThe obtained residue was purified by silica gel column chromatography
  6. washwashed with diethyl ether

Sources & evidence

ORD record
ord-1a53b22a5dca4a6c9354f1baf3e5b8a1
Source dataset
uspto-grants-2013_07
Patent number
US08486970B2

Reaction notes

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