反应详情

温度

80 °C

A mixture of 1-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]propan-1-one (250 mg, 0.612 mmol), O-ethylhydroxylamine hydrochloride (179 mg, 1.84 mmol) and pyridine (1.5 mL) in ethanol (6.0 mL) was stirred at 80° C. for 26 hr. The mixture was concentrated in vacuo, diluted with saturated aqueous sodium hydrogen carbonate, and extracted with ethyl acetate. The combined organic layer was washed with brine, dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a 20-40% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the solid, which was recrystallized from ethyl acetate/diisopropyl ether to give the title compounds as a colorless crystal respectively (E (Example 123): 111 mg, 0.246 mmol, 40%, Z (Example 124): 31.0 mg, 0.0686 mmol, 11%).

1. concentrationThe mixture was concentrated in vacuo
2. additiondiluted with saturated aqueous sodium hydrogen carbonate
3. extractionextracted with ethyl acetate
4. washThe combined organic layer was washed with brine
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe residue was purified by flash column chromatography on silica gel eluting with a 20-40% ethyl acetate/n-hexane gradient mixture
9. concentrationThe filtrate was concentrated in vacuo
10. customto give the solid, which
11. customwas recrystallized from ethyl acetate/diisopropyl ether