Reaktion #2446248

Reaktionsgleichung

2-acetyl-5-chlorothiophene

N,N-dimethylacetamide dimethyl acetal

Hydrazine monohydrate

→

3-(5-chloro-2-thienyl)-5-methyl-1H-pyrazole

Ausbeute 71.0%

Lösungsmittel

N,N-dimethylacetamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturto cool to room temperature
2. 2
   EinengenThe reaction mixture was concentrated under reduced pressure
3. 3
   workup.DISSOLUTIONthe residue was dissolved in 200 mL absolute ethanol
4. 4
   SonstigeThe solvent was removed under vacuum
5. 5
   workup.ADDITIONPetroleum ether was added
6. 6
   Sonstigethe precipitate formed
7. 7
   Filtrationwas filtered
8. 8
   Waschenthen washed

Vorschrift

A mixture of 2-acetyl-5-chlorothiophene (156 mmol) and N,N-dimethylacetamide dimethyl acetal (171 mmol) in 200 mL N,N-dimethylacetamide was heated to 90° C. for 4 h and then allowed to cool to room temperature. The reaction mixture was concentrated under reduced pressure and the residue was dissolved in 200 mL absolute ethanol. Hydrazine monohydrate (234 mmol) was added and the mixture was stirred at room temperature for 24 h. The solvent was removed under vacuum. Petroleum ether was added and the precipitate formed was filtered then washed to afford 22 g (71% yield) 3-(5-chloro-2-thienyl)-5-methyl-1H-pyrazole.

Quelle