Reacción #1551173

Ecuación de reacción

hydrazinoacetaldehyde diethyl acetal

ethoxymethylenemalononitrile

→

5-amino-4-cyano-1-(2,2-diethoxyethyl)pyrazole

Rendimiento 30.2%

Disolventes

ethanol

ethanol

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroThe reaction mixture was evaporated in vacuo
2. 2
   workup.ADDITIONTo the residue was added diethyl ether (400 ml)
3. 3
   Filtraciónthe resultant precipitate was filtered off
4. 4
   workup.ADDITIONa mixture of ethyl acetate and hexane (2:3) as an eluent
5. 5
   workup.ADDITIONFractions containing the object compound
6. 6
   Otroevaporated

Procedimiento

To a solution of hydrazinoacetaldehyde diethyl acetal (52.6 g) in ethanol (110 ml) was added dropwise a solution of ethoxymethylenemalononitrile (41.5 g) in ethanol (420 ml) at room temperature. The mixture was stirred at ambient temperature for 24 hours. The reaction mixture was evaporated in vacuo. To the residue was added diethyl ether (400 ml) and the resultant precipitate was filtered off. The filtrate was subjected to column chromatography on silica gel using a mixture of ethyl acetate and hexane (2:3) as an eluent. Fractions containing the object compound were combined and evaporated to give 5-amino-4-cyano-1-(2,2-diethoxyethyl)pyrazole (23.0 g).

Fuente