Aniline → dimethyl 4,5-dianilinobenzene-1,2-dicarboxylate

HRID 2396037Notes

Reaction equation

HRID 2396037 reaction equation
[CH3:1][O:2][C:3]([C:5]1[CH2:10][C:9](O[Si](C)(C)C)=[C:8](O[Si](C)(C)C)[CH2:7][C:6]=1[C:21]([O:23][CH3:24])=[O:22])=[O:4].[NH2:25][C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1>C(O)(=O)C>[CH3:1][O:2][C:3](=[O:4])[C:5]1[C:6](=[CH:7][C:8]([NH:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)=[C:9]([NH:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[CH:10]=1)[C:21]([O:23][CH3:24])=[O:22]

Participants

4

Reactant 2

HCID 6115AnilineHCID 10022190HCID 10022190, compound

Product 1

HCID 10407176dimethyl 4,5-dianilinobenzene-1,2-dicarboxylate

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

A solution of 5.6 g (15 mmol) of 4,5-bis(trimethylsilyloxy)cyclohexa-1,4-diene-1,2-dicarboxylic acid dimethyl ester and 5.5 ml (60 mmol) of aniline in 60 ml of glacial acetic acid is boiled under reflux for 4 hours. The reaction mixture is cooled, the solvent is evaporated off and the dark-brown residue is dissolved in dichloromethane and the solution is washed in succession with 20 ml of 1N HCl, 50 ml of saturated NaHCO3 and twice with 20 ml of water, dried with sodium sulfate and concentrated by evaporation. The crude product is recrystallized from ethanol, yielding the title compound in the form of yellow crystals, m.p. 178°, FAB-MS: 377 [M+ +H].

Workup

  1. temperatureunder reflux for 4 hours
  2. temperatureThe reaction mixture is cooled
  3. customthe solvent is evaporated off
  4. dissolutionthe dark-brown residue is dissolved in dichloromethane
  5. washthe solution is washed in succession with 20 ml of 1N HCl, 50 ml of saturated NaHCO3 and twice with 20 ml of water
  6. dry with materialdried with sodium sulfate
  7. concentrationconcentrated by evaporation
  8. customThe crude product is recrystallized from ethanol

Sources & evidence

ORD record
ord-bf5aef076cb44fb592eeb2e849b79cba
Source dataset
uspto-grants-1996_02
Patent number
US05491144

Reaction notes

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