Methane → 3-(2-Methylpropyl)piperazin-2-one

HRID 1413712Notes

Reaction equation

HRID 1413712 reaction equation
CO[C:3](=[O:10])[CH:4](Br)[CH2:5][CH:6]([CH3:8])[CH3:7].[CH2:11]([NH2:14])[CH2:12][NH2:13].C>C(O)C.CN(C=O)C.C(OCC)(=O)C>[CH3:8][CH:6]([CH3:7])[CH2:5][CH:4]1[NH:14][CH2:11][CH2:12][NH:13][C:3]1=[O:10]

Participants

7

Reactant 3

HCID 297MethaneHCID 3301EthylenediamineHCID 12957039Methyl 2-bromo-4-methylpentanoate

Product 1

HCID 135203663-(2-Methylpropyl)piperazin-2-one

Reagents, catalysts & solvents 3

HCID 702EthanolSolventHCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

A mixture of methyl 2-bromo-4-methylpentanoate (V, Example 3, 14.6 g.) and ethylenediamine (VI, 12.5 g.) in ethanol (250 ml.) is stirred at 20°-25° for 20 hours. The ethanol is removed under reduced pressure and the residual oil is partitioned between chloroform and aqueous sodium bicarbonate. The chloroform layer is separated and the chloroform is removed under reduced pressure to give an oil which is refluxed in DMF (20 ml.) for one hour. After removal of the DMF the residue is column chromatographed on silica gel eluting with chloroform-methanol (99/5). Appropriate fractions are pooled and concentrated to give a residue which is dissolved in ethyl acetate (150 ml.) and decolorized with charcoal. Crystallization from ethyl acetate-SSB gives an oily solid which upon crystallization from ethyl acetate-SSB gives the title compound, m.p. 75°-77°.

Workup

  1. customThe ethanol is removed under reduced pressure
  2. customthe residual oil is partitioned between chloroform and aqueous sodium bicarbonate
  3. customThe chloroform layer is separated
  4. customthe chloroform is removed under reduced pressure
  5. customto give an oil which
  6. customAfter removal of the DMF the residue
  7. customchromatographed on silica gel eluting with chloroform-methanol (99/5)
  8. concentrationconcentrated
  9. customto give a residue which
  10. customCrystallization from ethyl acetate-SSB
  11. customgives an oily solid which
  12. customupon crystallization from ethyl acetate-SSB

Sources & evidence

ORD record
ord-7b9de7d83ac84345ac0e4ad7ef0a3478
Source dataset
uspto-grants-1981_02
Patent number
US04251438

Reaction notes

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