反应详情

温度

70 °C

1.23 g of 4-(diphenylmethoxy)-1-piperidinepropanamine and 1.18 g of N-(6-chloroimidazo[1,2-b]pyridazine-2-carbonyl]-2,2-dimethylglycine ethyl ester were dissolved in 15 ml of N,N-dimethylformamide; 1.31 ml of N-ethyldiisopropylamine was added, followed by stirring at 70° C. for 9.5 hours. After cooling, aqueous sodium bicarbonate was added, followed by extraction with ethyl acetate; the extract was washed with saturated saline and dried with magnesium sulfate. The dry product was concentrated under reduced pressure; the residue was subjected to silica gel column chromatography and eluted with ethyl acetate:methanol:triethylamine (50:5:1). The desired fraction was collected, concentrated under reduced pressure and dissolved in 5 ml of ethyl acetate; 0.28 ml of a 4 N hydrogen chloride solution in ethyl acetate was added, followed by concentration again. Ethyl acetate was added to the residue; the crystal precipitated was collected by filtration, washed with ethyl ether and dried to yield 284 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 with magnesium sulfate
5. concentrationThe dry product was concentrated under reduced pressure
6. washeluted with ethyl acetate:methanol:triethylamine (50:5:1)
7. customThe desired fraction was collected
8. concentrationconcentrated under reduced pressure
9. dissolutiondissolved in 5 ml of ethyl acetate
10. addition0.28 ml of a 4 N hydrogen chloride solution in ethyl acetate was added
11. concentrationfollowed by concentration again
12. additionEthyl acetate was added to the residue
13. customthe crystal precipitated
14. filtrationwas collected by filtration
15. washwashed with ethyl ether
16. customdried