反应详情

To a solution of 1-[9-chloro-1-(6-methoxy-2-methylpyridin-3-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]propan-1-ol (122.3 mg, 0.316 mmol) in tetrahydrofuran (0.5 mL) were added 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (121.2 mg, 0.632 mmol), triethylamine (88 μL, 0.632 mmol), cyclopropanecarboxylic acid (37.8 μL, 0.474 mmol) and 4-dimethylaminopyridine (57.9 mg, 0.474 mmol). The reaction mixture was stirred at room temperature for 3.5 hrs. The mixture was quenched with aqueous saturated ammonium chloride and extracted with ethyl acetate (×3). The combined organic layer was washed with brine (×1), dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with a 0-40% ethyl acetate/n-hexane gradient mixture. The residue was recrystallized from diisopropyl ether/n-hexane to give the title compound as a colorless powder (105.2 mg, 0.231 mmol, 73%).

1. customThe mixture was quenched with aqueous saturated ammonium chloride
2. extractionextracted with ethyl acetate (×3)
3. washThe combined organic layer was washed with brine (×1)
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by silica gel column chromatography
8. washeluting with a 0-40% ethyl acetate/n-hexane gradient mixture
9. customThe residue was recrystallized from diisopropyl ether/n-hexane