反应详情

1.75 g of 4-(diphenylmethyl)-1-piperazinepropanamine and 854 mg of ethyl 2-[3,6-dichloroimidazo[1,2-b]pyridazin-2-yl]-2-methylpropionate were stirred at 160° C. for 4 hours. After cooling, aqueous sodium bicarbonate was added, followed by extraction with ethyl acetate; the extract was washed with saturated saline, dried over magnesium sulfate and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography and eluted with ethyl acetate:methanol (30:1). The desired fraction was collected, concentrated under reduced pressure and dissolved in 5 ml of ethyl acetate; 1.55 ml of a 4 N solution of hydrogen chloride in ethyl acetate was added, followed by concentration again. The crystal precipitated was washed by the addition of ethanol-ethyl acetate (1:3), collected by filtration and dried to yield 628 mg of the title compound.

1. temperatureAfter cooling
2. extractionfollowed by extraction with ethyl acetate
3. washthe extract was washed with saturated saline
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. washeluted with ethyl acetate:methanol (30:1)
7. customThe desired fraction was collected
8. concentrationconcentrated under reduced pressure
9. dissolutiondissolved in 5 ml of ethyl acetate
10. addition1.55 ml of a 4 N solution of hydrogen chloride in ethyl acetate was added
11. concentrationfollowed by concentration again
12. customThe crystal precipitated
13. washwas washed by the addition of ethanol-ethyl acetate (1:3)
14. filtrationcollected by filtration
15. customdried