Methyl pyruvate → Methyl2-(2,3,4-trifluoroanilino)propionate

HRID 8430

Reaktionsgleichung

Reaktionsgleichung von HRID 8430
[F:1][C:2]1[C:7]([F:8])=[C:6]([F:9])[CH:5]=[CH:4][C:3]=1[N+:10]([O-])=O.[C:13]([O:18][CH3:19])(=[O:17])[C:14]([CH3:16])=O.S([O-])([O-])(=O)=O.[Mg+2].[H][H]>CO.[Pd]>[F:1][C:2]1[C:7]([F:8])=[C:6]([F:9])[CH:5]=[CH:4][C:3]=1[NH:10][CH:14]([CH3:16])[C:13]([O:18][CH3:19])=[O:17]

Komponenten

7

Edukt 4

HCID 11748Methyl pyruvateHCID 24083Sulfuric acid magnesium salt (1:1)HCID 698711,2,3-Trifluoro-4-nitrobenzeneHCID 178418361HCID 178418361, Verbindung

Produkt 1

HCID 22015876Methyl2-(2,3,4-trifluoroanilino)propionateAusbeute 97,4 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 23938PalladiumKatalysatorHCID 887MethanolLösungsmittel

Versuchsvorschrift

2,3, 4-Trifluoronitrobenzene (100 g) and methyl pyruvate (57.6 g) were dissolved in methanol (1000 ml). After adding 5% Pd—C (20.0 g) and anhydrous magnesium sulfate (90 g), the mixture was stirred at room temperature in a hydrogen atmosphere for 16 hours. Then the liquid reaction mixture was filtered through celite to thereby eliminate Pd—C and magnesium sulfate. The obtained filtrate was concentrated under reduced pressure and Florisil (100 g) and diethyl ether (700 ml) were added to the residue. After stirring for 2 hours, the liquid reaction mixture was filtered. The obtained organic layer was evaporated and the crystals thus precipitated were filtered while washing with hexane. Thus the title compound (128.2 g) was obtained as slightly yellowish crystals.

Aufarbeitung

  1. customThen the liquid reaction mixture
  2. filtrationwas filtered through celite
  3. concentrationThe obtained filtrate was concentrated under reduced pressure and Florisil (100 g) and diethyl ether (700 ml)
  4. additionwere added to the residue
  5. customthe liquid reaction mixture
  6. filtrationwas filtered
  7. customThe obtained organic layer was evaporated
  8. customthe crystals thus precipitated
  9. filtrationwere filtered
  10. washwhile washing with hexane

Quellen und Nachweise

ORD-Eintrag
ord-df2cd1af74594089ac13ed08c39f07ae
Quelldatensatz
uspto-grants-2006_08
Patentnummer
US07087778B2

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