Potassium Carbonate → 1-(4-Trifluoromethylphenyl)imidazolidin-2-one

HRID 751015Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 751015
Cl[CH2:2][CH2:3][NH:4][C:5]([NH:7][C:8]1[CH:13]=[CH:12][C:11]([C:14]([F:17])([F:16])[F:15])=[CH:10][CH:9]=1)=[O:6].C([O-])([O-])=O.[K+].[K+]>CN(C=O)C>[F:15][C:14]([F:17])([F:16])[C:11]1[CH:12]=[CH:13][C:8]([N:7]2[CH2:2][CH2:3][NH:4][C:5]2=[O:6])=[CH:9][CH:10]=1

Komponenten

4

Edukt 2

HCID 11430Potassium CarbonateHCID 2563241-(2-Chloroethyl)-3-[4-(trifluoromethyl)phenyl]urea

Produkt 1

HCID 106809511-(4-Trifluoromethylphenyl)imidazolidin-2-one

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6228DimethylformamideLösungsmittel

Versuchsvorschrift

To a solution of methyl 4-trifluoromethylaniline (3.47 g, 21.6 mmol) in dry toluene (50 mL) was added 2-chloroethylisocyante (2.50 g, 2.02 mL, 23.7 mmol). The mixture was stirred at 40° C. for 12 h. After cooling to room temperature, the solid was collected by filtration and washed with toluene, water and dried in air to provide 1-(2-chloro-ethyl)-3-(4-trifluoromethylphenyl)urea [5.28 g, 92.0%, >95% pure by LC/MS MS (ES+) m/z: 267, 269]. The urea (5.27 g, 23.7 mmol) was then stirred in DMF (50.0 mL) with K2CO3 (3.27 g, 11.98 mmol) at room temperature for 12 h. The solid was filtered off and the solvent was removed in vacuum. The crude product was dissolved in dichloromethane and passed through a silica column (50 g) and eluted with dichloromethane:ethyl acetate, 8:2 to give pure cyclic urea intermediate, 1-(4-trifluoromethylphenyl)imidazolidin-2-one, as white crystalline material (3.85 g, 84.7%). MS (ES+) m/z: 231.

Aufarbeitung

  1. filtrationThe solid was filtered off
  2. customthe solvent was removed in vacuum
  3. dissolutionThe crude product was dissolved in dichloromethane
  4. washeluted with dichloromethane

Quellen und Nachweise

ORD-Eintrag
ord-8d081983d761452b91de52fc1e6d4914
Quelldatensatz
uspto-grants-2008_07
Patentnummer
US07405233B2

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