N,N'-Dimethylethylenediamine → HCID 67381273, compound

HRID 1804408Notes

Reaction equation

HRID 1804408 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][NH:11][C:10](=[O:14])[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].Br[C:16]1[CH:21]=[CH:20][C:19]([CH3:22])=[CH:18][C:17]=1[CH3:23].C(=O)([O-])[O-].[K+].[K+].CNCCNC>[Cu]I.O.C1(C)C=CC=CC=1>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:16]2[CH:21]=[CH:20][C:19]([CH3:22])=[CH:18][C:17]=2[CH3:23])[C:10](=[O:14])[CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

8

Reactant 4

HCID 8070N,N'-DimethylethylenediamineHCID 11430Potassium CarbonateHCID 68503Benzene, 1-bromo-2,4-dimethyl-HCID 3157178Tert-butyl 3-oxopiperazine-1-carboxylate

Product 1

HCID 67381273HCID 67381273, compound

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 962WaterSolventHCID 1140TolueneSolvent

Procedure

To a mixture of 3-oxopiperazine-1-carboxylic acid tert-butyl ester (5 g), 1-bromo-2,4-dimethylbenzene (3.4 mL), potassium carbonate (10.6 g) and copper (I) iodide (952 mg) were added toluene (25 mL) and N,N′-dimethylethylenediamine (1.1 mL), and the mixture was refluxed for 8 hr. After cooling, water was added to the reaction mixture, and the mixture was extracted with chloroform. The organic layer was washed with saturated brine, and the solvent was evaporated. The residue was purified by column chromatography (chloroform:methanol) to give 4-(2,4-dimethylphenyl)-3-oxopiperazine-1-carboxylic acid tert-butyl ester. The obtained 4-(2,4-dimethylphenyl)-3-oxopiperazine-1-carboxylic acid tert-butyl ester was dissolved in chloroform (10 mL), 4N hydrogen chloride/ethyl acetate (10 mL) was added, and the mixture was stirred at room temperature for 3 hr. The precipitate was collected by filtration to give 1-(2,4-dimethylphenyl)piperazin-2-one hydrochloride (3 g).

Workup

  1. temperaturethe mixture was refluxed for 8 hr
  2. temperatureAfter cooling
  3. extractionthe mixture was extracted with chloroform
  4. washThe organic layer was washed with saturated brine
  5. customthe solvent was evaporated
  6. customThe residue was purified by column chromatography (chloroform:methanol)

Sources & evidence

ORD record
ord-2dd5e8a82ef34681a6d2e6c30a231ab7
Source dataset
uspto-grants-2013_01
Patent number
US08354401B2

Reaction notes

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