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Ethanol → Ethyl 3-chloro-5-(trifluoromethyl)pyridine-2-carboxylate

HRID 650476
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 650476
Cl[C:2]1[C:7]([Cl:8])=[CH:6][C:5]([C:9]([F:12])([F:11])[F:10])=[CH:4][N:3]=1.[CH2:13]([OH:15])C.[C]=[O:17].C(N([CH2:23][CH3:24])CC)C>[Cl-].[Cl-].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[Pd+2]>[CH2:23]([O:17][C:13]([C:2]1[C:7]([Cl:8])=[CH:6][C:5]([C:9]([F:12])([F:11])[F:10])=[CH:4][N:3]=1)=[O:15])[CH3:24]
KomponentenReaktionsbedingungenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

6

Edukt 4

HCID 702EthanolHCID 8471TriethylamineHCID 1122342,3-Dichloro-5-(trifluoromethyl)pyridineHCID 178418416HCID 178418416, Verbindung

Produkt 1

HCID 22013558Ethyl 3-chloro-5-(trifluoromethyl)pyridine-2-carboxylateAusbeute 85 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 84124
Bis(triphenylphosphine)palladium(II) chloride
Katalysator

Reaktionsbedingungen

Temperatur
110 °C

Versuchsvorschrift

An autoclave is charged with 200 g of 2,3-dichloro-5-trifluoromethylpyridine, 1.85 liters of ethanol, 260 ml of triethylamine and 6.5 g of palladium bis(triphenylphosphine) dichloride (PdCl2(PPh3)2). At 25° C. a pressure of 110 bars is then applied with carbon monoxide and the mixture is maintained at 110° C. for 24 hours. After cooling to 25° C., the crude mixture is concentrated to a thick slurry, which is then partitioned between dilute sodium chloride solution and ethyl acetate. After extraction by shaking, and separation of the phases, the ethyl acetate phase is washed with water, dried over sodium sulfate and concentrated to dryness. The crude product is distilled under a high vacuum of 0.035 mbar. 200 g of the desired product are obtained in the form of a yellow oil having a boiling point of 67-70° C./0.035 mbar (yield 85% of the theoretical yield).

Aufarbeitung

  1. customAt 25° C.
  2. temperatureAfter cooling to 25° C.
  3. concentrationthe crude mixture is concentrated to a thick slurry, which
  4. customis then partitioned between dilute sodium chloride solution and ethyl acetate
  5. extractionAfter extraction
  6. customseparation of the phases
  7. washthe ethyl acetate phase is washed with water
  8. dry with materialdried over sodium sulfate
  9. concentrationconcentrated to dryness
  10. distillationThe crude product is distilled under a high vacuum of 0.035 mbar

Quellen und Nachweise

ORD-Eintrag
ord-046dd745272d4d8daefffc6dca8299b2
Quelldatensatz
uspto-grants-2001_08
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US06274536B1

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