反应详情

A solution of 2-(4-methyl-1-piperazinyl)acetic acid, hydrazide (3.44 g., 0.020 mole) and 3,5-difluorobenzylisothiocyanate (3.70 g., 0.020 mole) in ethanol (40 ml.) was refluxed for 17 hours and the solvent was removed under vacuum. The residue was triturated with ethyl acetate-ether and the resulting solid was filtered and recrystallized twice from ethanol to give 3-mercapto-4-(3, 5-difluorobenzyl)-5-[(4-methyl-1-piperazinyl)methyl]-1,2,4-triazole as a solid melting at 200°-201° C. (4.60 g., 68%).

1. customthe solvent was removed under vacuum
2. customThe residue was triturated with ethyl acetate-ether
3. filtrationthe resulting solid was filtered
4. customrecrystallized twice from ethanol