Trifluoroacetic acid → ethyl 5-amino-1-(2-fluorobenzyl)-1H-pyrazole-3-carboxylate

HRID 1591657Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1591657
FC(F)(F)C(O)=O.[Na].[C:9]([CH2:11][C:12](=O)[C:13]([O:15][CH2:16][CH3:17])=[O:14])#[N:10].[F:19][C:20]1[CH:28]=[CH:27][CH:26]=[CH:25][C:21]=1[CH2:22][NH:23][NH2:24]>O1CCOCC1>[NH2:10][C:9]1[N:23]([CH2:22][C:21]2[CH:25]=[CH:26][CH:27]=[CH:28][C:20]=2[F:19])[N:24]=[C:12]([C:13]([O:15][CH2:16][CH3:17])=[O:14])[CH:11]=1

Komponenten

6

Edukt 4

HCID 6422Trifluoroacetic acidHCID 5360545SodiumHCID 10374537(2-Fluorobenzyl)hydrazineHCID 11309560Ethyl 3-cyano-2-oxopropanoate

Produkt 1

HCID 11391384ethyl 5-amino-1-(2-fluorobenzyl)-1H-pyrazole-3-carboxylate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 312751,4-DioxaneLösungsmittel

Versuchsvorschrift

111.75 g (75 ml, 0.98 mol) of trifluoroacetic acid are added to 100 g (0.613 mmol) of the sodium salt of ethyl cyanopyruvate (preparation in analogy to Borsche and Manteuffel, Liebigs Ann. 1934, 512, 97) in 2.51 of dioxane under argon at room temperature with efficient stirring, and the mixture is stirred for 10 min, during which most of the precursor dissolves. Then 85.93 g (0.613 mol) of 2-fluorobenzylhydrazine are added and the mixture is boiled overnight. After cooling, the sodium trifluoroacetate crystals which have separated out are filtered off with suction and washed with dioxane, and the crude solution is reacted further.

Aufarbeitung

  1. dissolutiondissolves
  2. waitthe mixture is boiled overnight
  3. temperatureAfter cooling
  4. customthe sodium trifluoroacetate crystals which have separated out
  5. filtrationare filtered off with suction
  6. washwashed with dioxane
  7. customthe crude solution is reacted further

Quellen und Nachweise

ORD-Eintrag
ord-6f71cb86aacc470fb221c7208b69053b
Quelldatensatz
uspto-grants-2007_11
Patentnummer
US07291622B2

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