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0 °C

To a solution of 9-chloro-6-[1-(ethenyloxy)propyl]-1-(6-methoxy-2-methylpyridin-3-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole (65.0 mg, 0.157 mmol) in dichloromethane (1.5 mL) were added diethyl zinc (1.0 M solution in n-hexane, 0.787 mL, 0.787 mmol) and diiodomethane (0.13 mL, 1.57 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 5 hrs. The mixture was quenched with aqueous saturated ammonium chloride and extracted with ethyl acetate (×3). The combined organic layer was washed with water (×2) and 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 to give the mixture contained title compound. To the solution of residue in ethyl acetate/MeOH (1.0 mL/0.5 mL) was added 4N hydrochloric acid/ethyl acetate (25 μL). The reaction mixture was stirred at room temperature for 3 hrs. After the mixture was concentrated. The residue was purified by silica gel column chromatography eluting with a 0-40% ethyl acetate/n-hexane gradient mixture to give the title compound as a colorless amorphous (7.0 mg, 0.0164 mmol, 10%).

1. customThe mixture was quenched with aqueous saturated ammonium chloride
2. extractionextracted with ethyl acetate (×3)
3. washThe combined organic layer was washed with water (×2) and 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. customto give the mixture