Benzaldehyde → 5-Amino-3-methyl-1-phenylpyrazole

A mixture of acrylonitrile (15.3 g, 0.289 mol) and ethanol (75 ml) was stirred in an ice-bath and then hydrazine hydrate (15 ml, 0.3 mol) was added dropwise and the mixture was warmed to room temperature and stirred for 2 hours. Benzaldehyde (30.6 ml, 0.3 mol) was then added and the reaction mixture was stirred at room temperature for about 2 days. The react ion mixture was concentrated in vacuo and the residue was added to a solution of sodium butoxide in butanol [prepared from sodium metal (6.9 g) and butanol (300 ml)]. The reaction mixture was refluxed overnight and then the solvent was concentrated in vacuo to afford 19.4 g of crude 5-amino-1-phenyl methylpyrazole.

1. stirringstirred for 2 hours
2. stirringthe reaction mixture was stirred at room temperature for about 2 days
3. concentrationThe react ion mixture was concentrated in vacuo
4. additionthe residue was added to a solution of sodium butoxide in butanol [prepared from sodium metal (6.9 g) and butanol (300 ml)]
5. temperatureThe reaction mixture was refluxed overnight
6. concentrationthe solvent was concentrated in vacuo

ORD-Eintrag

ord-50db801540544adb82effaf5be68c7d3

Quelldatensatz

uspto-grants-1996_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05488055