Pyrazole → 2-Chloro-4-(1-pyrazolyl)methylphenyl 2,2-dimethylpropanoate

HRID 1740821Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1740821
[NH:1]1[CH:5]=[CH:4][CH:3]=[N:2]1.[H-].[Na+].[H][H].[CH3:10][C:11]([CH3:25])([CH3:24])[C:12]([O:14][C:15]1[CH:20]=[CH:19][C:18]([CH2:21]Br)=[CH:17][C:16]=1[Cl:23])=[O:13]>CN(C)C=O>[CH3:10][C:11]([CH3:25])([CH3:24])[C:12]([O:14][C:15]1[CH:20]=[CH:19][C:18]([CH2:21][N:1]2[CH:5]=[CH:4][CH:3]=[N:2]2)=[CH:17][C:16]=1[Cl:23])=[O:13]

Komponenten

6

Edukt 4

HCID 1048PyrazoleHCID 24758Sodium hydrideHCID 21833670HCID 21833670, VerbindungHCID 178418361HCID 178418361, Verbindung

Produkt 1

HCID 545168712-Chloro-4-(1-pyrazolyl)methylphenyl 2,2-dimethylpropanoateAusbeute 60,6 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6228DimethylformamideLösungsmittel2×

Reaktionsbedingungen

Temperatur
10 °C

Versuchsvorschrift

A mixture of 15.3 g of pyrazole, 89.9 g of sodium hydride (60% oil dispersion) and 200 ml of anhydrous N,N-dimethylformamide was stirred at 60° to 70° C. under a nitrogen atmosphere for 2 hours. After the evolution of hydrogen gas ceased, the mixture was cooled to 10° C. To this mixture was added dropwise an anhydrous N,N-dimethylformamide (300 ml) solution of 68 g of 4-bromomethyl-2-chlorophenyl 2,2-dimethylpropanoate at room temperature under stirring over 1 hour, and the mixture was stirred at 80° C. for 1 hour. After cooling, the mixture was poured into ice water, which was extracted with ethyl acetate. The organic layer was washed with saturated aqueous ammonium chloride solution and then saturated sodium chloride solution, dried with anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography, which afforded 39.5 g of 2-chloro4-(1-pyrazolyl)methylphenyl 2,2-dimethylpropanoate as a colorless oil. Yield, 60%.

Aufarbeitung

  1. stirringunder stirring over 1 hour
  2. stirringthe mixture was stirred at 80° C. for 1 hour
  3. temperatureAfter cooling
  4. extractionwas extracted with ethyl acetate
  5. washThe organic layer was washed with saturated aqueous ammonium chloride solution
  6. dry with materialsaturated sodium chloride solution, dried with anhydrous magnesium sulfate
  7. concentrationconcentrated under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-5dd1865fbfaa4271837cde5fbe3f62aa
Quelldatensatz
uspto-grants-1999_10
Patentnummer
US05972949

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