Oxalyl chloride → 1,1-Dimethylethyl 2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxo-2-propenyl]hydrazinecarboxylic acid

HRID 1492993Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1492993
C(Cl)(=O)C(Cl)=O.[CH3:7][C:8]([C:11]1[CH:12]=[C:13]([CH:19]=[C:20]([C:23]([CH3:26])([CH3:25])[CH3:24])[C:21]=1[OH:22])[CH:14]=[CH:15][C:16]([OH:18])=O)([CH3:10])[CH3:9].[CH3:27][C:28]([N:31]([C:33]([OH:35])=[O:34])[NH2:32])([CH3:30])[CH3:29]>C(Cl)Cl.CN(C)C=O>[CH3:27][C:28]([N:31]([C:33]([OH:35])=[O:34])[NH:32][C:16](=[O:18])[CH:15]=[CH:14][C:13]1[CH:12]=[C:11]([C:8]([CH3:7])([CH3:10])[CH3:9])[C:21]([OH:22])=[C:20]([C:23]([CH3:25])([CH3:24])[CH3:26])[CH:19]=1)([CH3:30])[CH3:29]

Komponenten

6

Edukt 3

HCID 65578Oxalyl chlorideHCID 998193-(3,5-Ditert-butyl-4-hydroxyphenyl)prop-2-enoic acidHCID 219636841,1-Dimethylethyl hydrazinecarboxylic acid

Produkt 1

HCID 543996901,1-Dimethylethyl 2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxo-2-propenyl]hydrazinecarboxylic acidAusbeute 76 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 6228DimethylformamideLösungsmittelHCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

Oxalyl chloride (2.9 g, 0.023 mole) is added dropwise to a stirred 0° C. solution of 3,5-bis(1,1-dimethylethyl)-4-hydroxycinnamic acid (4.3 g, 0.016 mole) in methylene chloride (30 ml) and N,N-dimethylformamide (0.5 ml). After one hour the solvent is removed in vacuo. The residue is dissolved in methylene chloride (30 ml) and added dropwise to a stirred 0° C. solution of 1,1-dimethylethyl hydrazinecarboxylic acid (4.5 g, 0.034 mole). After the addition is complete, the mixture is allowed to warm to room temperature and stir 18 hours. The mixture is concentrated in vacuo and the residue dissolved in methylene chloride (50 ml) and washed with aqueous 2M HCl, saturated aqueous NaCl, and dried MgSO4. Filtration and concentration gives a solid which was recrystallized from ethyl acetate/isopropyl ether to provide 4.6 g (6.1 g theor., 76% ) of 1,1-dimethylethyl 2- [3- [3,5-bis (1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxo-2-propenyl]hydrazinecarboxylic acid, mp 184° C.

Aufarbeitung

  1. customAfter one hour the solvent is removed in vacuo
  2. dissolutionThe residue is dissolved in methylene chloride (30 ml)
  3. additionAfter the addition
  4. concentrationThe mixture is concentrated in vacuo
  5. dissolutionthe residue dissolved in methylene chloride (50 ml)
  6. washwashed with aqueous 2M HCl, saturated aqueous NaCl, and dried MgSO4
  7. filtrationFiltration and concentration
  8. customgives a solid which
  9. customwas recrystallized from ethyl acetate/isopropyl ether

Quellen und Nachweise

ORD-Eintrag
ord-9a84002c48084eba8a0fd7aaee471bf2
Quelldatensatz
uspto-grants-1994_12
Patentnummer
US05376670

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