[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[N:9]1[C:14]2=[N:15][C:16]3[CH:21]=[CH:20][CH:19]=[C:18]([CH:22]([OH:27])[C:23]([F:26])([F:25])[F:24])[C:17]=3[N:13]2[CH2:12][CH2:11][CH2:10]1.[C:28](=O)([O-])[O-].[K+].[K+].CI>CN(C)C=O.O>[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[N:9]1[C:14]2=[N:15][C:16]3[CH:21]=[CH:20][CH:19]=[C:18]([CH:22]([O:27][CH3:28])[C:23]([F:24])([F:25])[F:26])[C:17]=3[N:13]2[CH2:12][CH2:11][CH2:10]1A mixture of 1-[1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]-2,2,2-trifluoroethanol (475 mg, 1.14 mmol), potassium carbonate (174 mg, 1.26 mmol) and methyl iodide (242 mg, 1.71 mmol) in N,N-dimethylformamide (3.0 mL) was stirred at room temperature for 3 hr. The mixture was diluted with water, 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 10-30% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the solid, which was recrystallized from ethyl acetate/n-hexane to give the title compound as a colorless crystal (49.2 mg, 0.114 mmol, 10%).
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