Morpholine → 3-bromo-1-methyl-4-morpholino-1H-pyrrole-2,5-dione

HRID 1425832Notes

Reaction equation

HRID 1425832 reaction equation
Br[C:2]1[C:3]([N:5]([CH3:10])[C:6](=[O:9])[C:7]=1[Br:8])=[O:4].C([O-])([O-])=O.[Cs+].[Cs+].[NH:17]1[CH2:22][CH2:21][O:20][CH2:19][CH2:18]1>CN(C=O)C>[Br:8][C:7]1[C:6](=[O:9])[N:5]([CH3:10])[C:3](=[O:4])[C:2]=1[N:17]1[CH2:22][CH2:21][O:20][CH2:19][CH2:18]1

Participants

5

Reactant 3

HCID 8083MorpholineHCID 10796Cesium carbonateHCID 181552,3-Dibromo-N-methylmaleimide

Product 1

HCID 593547463-bromo-1-methyl-4-morpholino-1H-pyrrole-2,5-dioneYield 85%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a room temperature, stirred solution of 2,3-dibromo-N-methylmaleimide (1 g, 0.004 mol) in DMF (10 mL) was added Cs2CO3 (1.34 g, 0.004 mol) followed by morpholine (360 mg, 0.004 mol) under N2 atmosphere. The reaction mixture was then stirred for 30 minutes, quenched with ice water, and extracted with EtOAc (2×50 mL). The combined organic layers were washed with water, dried over anhydrous Na2SO4, filtered and concentrated in vacuo to afford 3-bromo-1-methyl-4-morpholino-1H-pyrrole-2,5-dione (0.87 g, 85%) as a solid.

Workup

  1. customquenched with ice water
  2. extractionextracted with EtOAc (2×50 mL)
  3. washThe combined organic layers were washed with water
  4. dry with materialdried over anhydrous Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-62ed4fd4c6b74dfa9f58db71c7348ae3
Source dataset
uspto-grants-2015_01
Patent number
US08933074B2

Reaction notes

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