[H-].[Na+].[Cl:3][C:4]1[C:12]2[N:11]=[C:10]3[N:13]([C:17]4[C:22]([CH3:23])=[CH:21][C:20]([Cl:24])=[CH:19][C:18]=4[Cl:25])[CH2:14][CH2:15][CH2:16][N:9]3[C:8]=2[C:7]([CH:26]([OH:30])[CH2:27][CH2:28][CH3:29])=[CH:6][CH:5]=1.[CH3:31]I>CN(C)C=O.O>[Cl:3][C:4]1[C:12]2[N:11]=[C:10]3[N:13]([C:17]4[C:22]([CH3:23])=[CH:21][C:20]([Cl:24])=[CH:19][C:18]=4[Cl:25])[CH2:14][CH2:15][CH2:16][N:9]3[C:8]=2[C:7]([CH:26]([O:30][CH3:31])[CH2:27][CH2:28][CH3:29])=[CH:6][CH:5]=1Sodium hydride (60% in oil, 7.6 mg, 0.190 mmol) was added to a stirred solution of 1-[9-chloro-1-(2,4-dichloro-6-methylphenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]butan-1-ol (69.5 mg, 0.158 mmol) in N,N-dimethylformamide (1.0 mL) at room temperature. After stirring 5 min, methyl iodide (33.6 mg, 0.237 mmol) was added to the mixture, and the mixture 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 5-50% 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 compound as a colorless crystal (43.4 mg, 0.0958 mmol, 61%).
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