反应详情

A mixture comprising 1.34 g of 3-n-propoxy-4-methoxybenzylamine hydrochloride, 0.4 g of 4,5-dichloro-2-i-propyl-3(2H)pyridazinone, 1.08 g of potassium carbonate, 6 ml of 1,4-dioxane and 18 ml of water was refluxed under stirring for 8 hours. The solvent was distilled off under reduced pressure, and water was added to the the residue thereby obtained, and then the mixture was extracted with ethyl acetate. The extract was washed successively with diluted hydrochloric acid, water and a saturated sodium chloride aqueous solution, and dried over sodium sulfate, and then the solvent was distilled off. The product was crystallized from ethyl acetate-diethyl ether-n-hexane to obtain 230 mg of the above identified compound having a melting point of from 120° to 122° as colorless crystals.

1. temperaturewas refluxed
2. distillationThe solvent was distilled off under reduced pressure, and water
3. additionwas added to the the residue
4. customthereby obtained
5. extractionthe mixture was extracted with ethyl acetate
6. washThe extract was washed successively with diluted hydrochloric acid, water
7. dry with materiala saturated sodium chloride aqueous solution, and dried over sodium sulfate
8. distillationthe solvent was distilled off
9. customThe product was crystallized from ethyl acetate-diethyl ether-n-hexane
10. customto obtain 230 mg of the
11. customof from 120° to 122°