Methane → 1-(4-Hydroxyphenyl)-4,4-dimethylpiperidine-2,6-dione

HRID 1831038Notes

Reaction equation

HRID 1831038 reaction equation
[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[CH:4][CH:3]=1.[CH3:9][C:10]1([CH3:18])[CH2:16][C:15](=O)[O:14][C:12](=[O:13])[CH2:11]1.C>C(O)C>[OH:8][C:5]1[CH:6]=[CH:7][C:2]([N:1]2[C:12](=[O:13])[CH2:11][C:10]([CH3:18])([CH3:9])[CH2:16][C:15]2=[O:14])=[CH:3][CH:4]=1

Participants

5

Reactant 3

HCID 297MethaneHCID 4034-AminophenolHCID 778133,3-Dimethylglutaric anhydride

Product 1

HCID 220477421-(4-Hydroxyphenyl)-4,4-dimethylpiperidine-2,6-dioneYield 50.2%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Conditions

Temperature
165 °C

Procedure

A mixture of 4-aminophenol (3.27 g, 30.0 mmol) and 3,3-dimethylglutaric anhydride (4.26 g, 30.0 mmol) was heated in a round bottom flask at 165° C. for 1 h, followed by heating at 180° C. for 7 h. After cooling to room temperature the solid material was dissolved in hot ethanol, activated charcoal was added and the solution was heated at reflux for 1 h. The solid material was removed by hot filtration. The solvent was evaporated and the residue was crystallised (water/ethanol) yielding the title compound (3.51 g, 50%, pink solid).

Workup

  1. temperatureby heating at 180° C. for 7 h
  2. temperatureAfter cooling to room temperature the solid material
  3. temperaturethe solution was heated
  4. temperatureat reflux for 1 h
  5. customThe solid material was removed by hot filtration
  6. customThe solvent was evaporated
  7. customthe residue was crystallised (water/ethanol)

Sources & evidence

ORD record
ord-4c7d7bccf5c8497b9fd63d87476bb473
Source dataset
uspto-grants-2006_06
Patent number
US07067517B2

Reaction notes

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