2-Hydrazinopyridine → 3,5-dimethyl-1-pyridin-2-yl-1H-pyrazole-4-carboxylic acid ethyl ester

HRID 220469

Reaktionsgleichung

Reaktionsgleichung von HRID 220469
[CH2:1]([O:3][C:4](=[O:12])[CH:5]([C:9](=O)[CH3:10])[C:6](=O)[CH3:7])[CH3:2].[N:13]1[CH:18]=[CH:17][CH:16]=[CH:15][C:14]=1[NH:19][NH2:20]>C(O)(=O)C>[CH2:1]([O:3][C:4]([C:5]1[C:9]([CH3:10])=[N:20][N:19]([C:14]2[CH:15]=[CH:16][CH:17]=[CH:18][N:13]=2)[C:6]=1[CH3:7])=[O:12])[CH3:2]

Komponenten

4

Versuchsvorschrift

Dissolve 2-acetyl-3-oxobutyric acid ethyl ester (20.74 g, 0.120 mol) and 2-pyridylhydrazine (14.5 mL, 0.133 mol) in acetic acid (160 mL) and stir the mixture for 18 hr. Concentrate, dilute with DCM, wash with saturated sodium bicarbonate, dry (sodium sulfate), filter and concentrate to give 3,5-dimethyl-1-pyridin-2-yl-1H-pyrazole-4-carboxylic acid ethyl ester as an oil (28.6 g, 97%). MS (APCI): m/z=246 [M+H]+.

Aufarbeitung

  1. concentrationConcentrate
  2. additiondilute with DCM
  3. washwash with saturated sodium bicarbonate
  4. dry with materialdry (sodium sulfate)
  5. filtrationfilter
  6. concentrationconcentrate

Quellen und Nachweise

ORD-Eintrag
ord-8084db007efd497d9560deff49f3af73
Quelldatensatz
uspto-grants-2012_06
Patentnummer
US08202873B2

Verknüpfte Notizen

Wird geladen…