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温度

0 °C

To a solution of 9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carbaldehyde (150.0 mg, 0.394 mmol) in tetrahydrofuran (3.0 mL) was added i-propylmagnesium chloride (1.0 M solution in tetrahydrofuran, 0.59 mL, 0.591 mmol). The reaction mixture was stirred at 0° C. for 2 hrs. To the mixture was added i-propylmagnesium chloride (1.0 M solution in tetrahydrofuran, 0.59 mL, 0.591 mmol). The mixture was stirred at 0° C. for 1 hr. After cooling, the mixture was quenched with aqueous saturated ammonium chloride and extracted with ethyl acetate (×3). The combined organic layer was washed with brine, dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with a 10-60% ethyl acetate/n-hexane gradient mixture to give the title compound as a solid (78.8 mg, 0.186 mmol, 47%).

1. stirringThe mixture was stirred at 0° C. for 1 hr
2. temperatureAfter cooling
3. customthe mixture was quenched with aqueous saturated ammonium chloride
4. extractionextracted with ethyl acetate (×3)
5. washThe combined organic layer was washed with brine
6. dry with materialdried over anhydrous magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe residue was purified by silica gel column chromatography
10. washeluting with a 10-60% ethyl acetate/n-hexane gradient mixture