反应详情

6-(2-Hydroxyethoxy)[1,2,4]triazolo[1,5-b]pyridazine (450 mg) was dissolved in tetrahydrofuran (20 ml), followed by addition of carbonyldiimidazole (649 mg). The mixture was stirred at room temperature for 3 hours, followed by addition of 1-(diphenylmethyl)piperazine (1.07 g) and N-ethyldiisopropylamine (0.73 ml). The mixture was stirred at 60° C. for 17 hours and concentrated under reduced pressure. Ice-water was added to the residue, followed by extraction with ethyl acetate. The extract was washed with an aqueous sodium chloride saturated solution, dried over magnesium sulfate and concentrated under reduced pressure. The residue was subjected to silica-gel column chromatography and eluted with a mixture of ethyl acetate and hexane (1:1). Fractions containing the objective compound were collected and concentrated. The resulting crystals were recrystalized from ethyl acetate to yield the title compound (464 mg).

1. stirringThe mixture was stirred at 60° C. for 17 hours
2. concentrationconcentrated under reduced pressure
3. additionIce-water was added to the residue
4. extractionfollowed by extraction with ethyl acetate
5. washThe extract was washed with an aqueous sodium chloride saturated solution
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated under reduced pressure
8. washeluted with a mixture of ethyl acetate and hexane (1:1)
9. additionFractions containing the objective compound
10. customwere collected
11. concentrationconcentrated
12. customThe resulting crystals were recrystalized from ethyl acetate