反应详情

1 g (4.32 mmol) of 2-(1,3-benzothiazol-2-yl)-5-methyl-2,4-dihydro-3H-pyrazol-3-one and 1.93 g (12.96 mmol) of 4-(dimethylamino)benzaldehyde are stirred under reflux with the addition of 3 ml of piperidine in absolute ethanol for 2 hours. The mixture is then diluted with water and the bright red precipitate is filtered off, then washed with water and a small amount of cold methanol and dried under reduced pressure.

1. filtrationthe bright red precipitate is filtered off
2. washwashed with water
3. dry with materiala small amount of cold methanol and dried under reduced pressure