Ethanol → Ethyl 4-(1H-pyrazol-1-YL)benzoate

HRID 563288

Reaktionsgleichung

Reaktionsgleichung von HRID 563288
[N:1]1([C:6]2[CH:14]=[CH:13][C:9]([C:10]([OH:12])=[O:11])=[CH:8][CH:7]=2)[CH:5]=[CH:4][CH:3]=[N:2]1.S(=O)(=O)(O)O.[CH3:20][CH2:21]O>>[N:1]1([C:6]2[CH:7]=[CH:8][C:9]([C:10]([O:12][CH2:20][CH3:21])=[O:11])=[CH:13][CH:14]=2)[CH:5]=[CH:4][CH:3]=[N:2]1

Komponenten

4

Edukt 3

HCID 702EthanolHCID 1118Sulfuric AcidHCID 7365274-(1H-pyrazol-1-yl)benzoic acid

Produkt 1

HCID 973146Ethyl 4-(1H-pyrazol-1-YL)benzoate

Versuchsvorschrift

To a solution of 4-(1H-pyrazol-1-yl)benzoic acid (CAS 160209-00-0, 678 mg, 3.60 mmol) in absolute EtOH (10 mL) was added sulfuric acid (0.1 mL) at room temperature. The reaction mixture was heated to reflux and stirred for 71 h, then concentrated under reduced pressure. The residue was partitioned between sat. aq. NaHCO3 (60 mL) and EtOAc (50 mL). The aqueous layer was extracted with EtOAc (50 mL). The combined organic extracts were dried (Na2SO4), filtered and concentrated under reduced pressure to provide the title compound as an off white solid (711 mg, 91%): 1H NMR (400 MHz, CDCl3, δ in ppm) 8.14 (d, J=8.6 Hz, 2H), 8.01 (d, J=2.5 Hz, 1H), 7.78 (d, J=8.8 Hz, 2H), 7.78-7.75 (m, 1H), 6.51 (t, J=1.8 Hz, 1H), 4.39 (q, J=7.2 Hz, 2H), 1.41 (t, J=7.0 Hz, 3H).

Aufarbeitung

  1. temperatureThe reaction mixture was heated
  2. temperatureto reflux
  3. concentrationconcentrated under reduced pressure
  4. customThe residue was partitioned between sat. aq. NaHCO3 (60 mL) and EtOAc (50 mL)
  5. extractionThe aqueous layer was extracted with EtOAc (50 mL)
  6. dry with materialThe combined organic extracts were dried (Na2SO4)
  7. filtrationfiltered
  8. concentrationconcentrated under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-fc7de25a49c64dbfa364813fdabc80d3
Quelldatensatz
uspto-grants-2011_11
Patentnummer
US08067448B2

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