Water → ethyl (2E)-3-(2-methylpyrazolo[1,5-a]pyridin-4-yl)acrylate

HRID 1639747Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1639747
[H-].[Na+].C(OP([CH2:11][C:12]([O:14][CH2:15][CH3:16])=[O:13])(OCC)=O)C.[CH3:17][C:18]1[CH:28]=[C:21]2[C:22]([CH:26]=O)=[CH:23][CH:24]=[CH:25][N:20]2[N:19]=1.O>O1CCCC1>[CH3:17][C:18]1[CH:28]=[C:21]2[C:22](/[CH:26]=[CH:11]/[C:12]([O:14][CH2:15][CH3:16])=[O:13])=[CH:23][CH:24]=[CH:25][N:20]2[N:19]=1

Komponenten

6

Edukt 4

HCID 962WaterHCID 13345Triethyl phosphonoacetateHCID 24758Sodium hydrideHCID 593346342-Methylpyrazolo[1,5-A]pyridine-4-carbaldehyde

Produkt 1

HCID 66720788ethyl (2E)-3-(2-methylpyrazolo[1,5-a]pyridin-4-yl)acrylateAusbeute 91,2 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel3×

Versuchsvorschrift

Under nitrogen atmosphere, to a suspension of sodium hydride (2.70 g, 61.8 mmol) in tetrahydrofuran (42 mL) was added a solution of ethyl diethylphosphonoacetate (13.8 g, 61.8 mmol) in tetrahydrofuran (20 mL) at 0° C., and the mixture was stirred for 20 min. To the reaction mixture was added a solution of 2-methylpyrazolo[1,5-a]pyridine-4-carbaldehyde (9.00 g, 56.2 mmol) in tetrahydrofuran (50 mL), and the mixture was warmed to room temperature over 4 hr. Water was added and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane=3/1) to give the title compound (11.8 g, yield 91%).

Aufarbeitung

  1. extractionthe mixture was extracted with ethyl acetate
  2. washThe extract was washed with saturated brine
  3. dry with materialdried over anhydrous sodium sulfate
  4. customthe solvent was evaporated under reduced pressure
  5. customThe residue was purified by silica gel column chromatography (ethyl acetate/hexane=3/1)

Quellen und Nachweise

ORD-Eintrag
ord-07e3a9f77aea4fd3928e0d0d768b0d04
Quelldatensatz
uspto-grants-2012_02
Patentnummer
US08110585B2

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