反应详情

In 50 ml of acetonitrile was suspended 6.73 g (20.0 mM) of 3-carbethoxy-5-chloromethylimidazo[1,2-a]pyridine sulfate followed by addition of 5.97 ml (40.0 mM) of DBU at room temperature with stirring. To the resulting solution was added 4.57 g (20.0 mM) of 2-(1-tert-butoxycarbonylpiperidin-4-yl)-1-ethylamine as well as 5.54 ml (40.0 mM) of triethylamine and 3.00 g (20.0 mM) of sodium iodide and the mixture was stirred at room temperature for 16 hours. After completion of the reaction, the solvent was distilled off under reduced pressure and the residue was extracted with 100 ml of 2-butanone. The organic layer was washed with 100 ml of saturated aqueous NaCl solution and dried over MgSO4 and the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (eluent: ethyl acetate-ethanol=5:1) to provide 2.88 g (yield 37.5%) of the title compound as yellow oil.

1. stirringthe mixture was stirred at room temperature for 16 hours
2. customAfter completion of the reaction
3. distillationthe solvent was distilled off under reduced pressure
4. extractionthe residue was extracted with 100 ml of 2-butanone
5. washThe organic layer was washed with 100 ml of saturated aqueous NaCl solution
6. dry with materialdried over MgSO4
7. distillationthe solvent was distilled off under reduced pressure
8. customThe residue was purified by silica gel column chromatography (eluent: ethyl acetate-ethanol=5:1)