p-Toluenesulfonic acid → HCID 70607338, compound

HRID 1834057Notes

Reaction equation

HRID 1834057 reaction equation
[N:1]1([CH2:7][CH2:8][OH:9])[CH2:6][CH2:5][NH:4][CH2:3][CH2:2]1.[CH3:10][O:11][C:12]1[C:20]([O:21][CH3:22])=[C:19]([O:23][CH3:24])[CH:18]=[CH:17][C:13]=1[C:14]([OH:16])=[O:15].C1(C)C=CC(S(O)(=O)=O)=CC=1.[C:36]([OH:43])(=[O:42])/[CH:37]=[CH:38]\[C:39]([OH:41])=[O:40]>C1C=CC=CC=1>[C:36]([OH:43])(=[O:42])/[CH:37]=[CH:38]\[C:39]([OH:41])=[O:40].[CH3:10][O:11][C:12]1[C:20]([O:21][CH3:22])=[C:19]([O:23][CH3:24])[CH:18]=[CH:17][C:13]=1[C:14]([OH:16])=[O:15].[N:1]1([CH2:7][CH2:8][OH:9])[CH2:6][CH2:5][NH:4][CH2:3][CH2:2]1

Participants

6

Reactant 4

HCID 6101p-Toluenesulfonic acidHCID 76771-(2-Hydroxyethyl)piperazineHCID 113082,3,4-Trimethoxybenzoic acidHCID 444266Maleic Acid

Product 1

HCID 70607338HCID 70607338, compoundYield 46%

Reagents, catalysts & solvents 1

HCID 241BenzeneSolvent

Procedure

In 150 ml of absolute benzene there were dissolved 26 g of 1-piperazineethanol, 5.5 g of 2,3,4-trimethoxybenzoic acid and 19 g of p-toluene sulfonic acid. The solution was heated for 15 hours to reflux while removing the formed water. After the reaction liquid was cooled, the reaction liquid was washed with 15% potassium carbonate and then extracted with 10% hydrochloric acid. After washing the aqueous layer with ether, the system was rendered alkaline with potassium carbonate followed by extraction with ether. The ethereal layer was dehydrated with a Glauber's salt and then the ether was removed by distillation. The resultant residue was subjected to chromatography using silica gel to give a colorless transparent liquid. The liquid was treated in a conventional manner to convert the product into the maleic acid salt thereof. Upon crystallization from ethanol, 1-piperazineethanol 2,3,4-trimethoxybenzoate maleate was obtained exhibiting a melting point of 140°-141° C. The Yield was 46%.

Workup

  1. temperatureThe solution was heated for 15 hours
  2. temperatureto reflux
  3. customwhile removing the formed water
  4. customAfter the reaction liquid
  5. temperaturewas cooled
  6. customthe reaction liquid
  7. washwas washed with 15% potassium carbonate
  8. extractionextracted with 10% hydrochloric acid
  9. washAfter washing the aqueous layer with ether
  10. extractionfollowed by extraction with ether
  11. customthe ether was removed by distillation
  12. customto give a colorless transparent liquid
  13. additionThe liquid was treated in a conventional manner
  14. customUpon crystallization from ethanol

Sources & evidence

ORD record
ord-d88d90cf62114a7a9dec214e7fa7d614
Source dataset
uspto-grants-1978_01
Patent number
US04068069

Reaction notes

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