Water → trans-Ethyl 2-(2-methylpyrazolo[1,5-a]pyridin-4-yl)cyclopropanecarboxylate

HRID 1639750Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1639750
[H-].[Na+].[I-].[CH3:4][S+](C)(C)=O.[CH3:9][C:10]1[CH:25]=[C:13]2[C:14](/[CH:18]=[CH:19]/[C:20]([O:22][CH2:23][CH3:24])=[O:21])=[CH:15][CH:16]=[CH:17][N:12]2[N:11]=1.O>CS(C)=O>[CH3:9][C:10]1[CH:25]=[C:13]2[C:14]([C@@H:18]3[CH2:4][C@H:19]3[C:20]([O:22][CH2:23][CH3:24])=[O:21])=[CH:15][CH:16]=[CH:17][N:12]2[N:11]=1

Komponenten

6

Edukt 4

HCID 962WaterHCID 24758Sodium hydrideHCID 74498Sulfoxonium, trimethyl-, iodide (1:1)HCID 66720788ethyl (2E)-3-(2-methylpyrazolo[1,5-a]pyridin-4-yl)acrylate

Produkt 1

HCID 131729434trans-Ethyl 2-(2-methylpyrazolo[1,5-a]pyridin-4-yl)cyclopropanecarboxylateAusbeute 61,2 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 679Dimethyl SulfoxideLösungsmittel2×

Versuchsvorschrift

Under nitrogen atmosphere, to a suspension of sodium hydride (1.64 g, 41.0 mmol) in dimethyl sulfoxide (30 mi.') was added trimethylsulfoxonium iodide (9.01 g, 41.0 mmol) at 0° C., and the mixture was stirred at room temperature for 1 hr. To the reaction mixture was added a solution of ethyl (2E)-3-(2-methylpyrazolo[1,5-a]pyridin-4-yl)acrylate (7.86 g, 34.1 mmol) in dimethyl sulfoxide (120 mL) at 0° C., and the mixture was stirred at room temperature for 14 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=1/2) to give the title compound (5.10 g, yield 61%).

Aufarbeitung

  1. stirringthe mixture was stirred at room temperature for 14 hr
  2. extractionthe mixture was extracted with ethyl acetate
  3. washThe extract was washed with saturated brine
  4. dry with materialdried over anhydrous sodium sulfate
  5. customthe solvent was evaporated under reduced pressure
  6. customThe residue was purified by silica gel column chromatography (ethyl acetate/hexane=1/2)

Quellen und Nachweise

ORD-Eintrag
ord-82e7bcfb7441423aa35bf8cf61754894
Quelldatensatz
uspto-grants-2012_02
Patentnummer
US08110585B2

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