Potassium Carbonate → 1-(2,4-Dichlorophenyl)-N,N-diethyl-3,3-difluoro-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-amine

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Reaction Conditions

Reaction Steps

To a solution of 3-{2-[(2,4-dichlorophenyl)amino]-7-(diethylamino)-1H-benzimidazol-1-yl}-2,2-difluoropropan-1-ol (Reference example 154, 48.9 mg, 0.110 mmol) in pyridine (1.5 mL) was added methanesulfonyl chloride (25.6 μL, 0.330 mmol) at 0° C. The mixture was stirred at 0° C. for 2 hrs. The starting material wasn't consumed completely. To the mixture was added methanesulfonyl chloride (25.6 μL, 0.330 mmol) at 0° C. and the mixture was stirred at room temperature for 14 hrs. The mixture was quenched with 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 resulting mesylate was dissolved into N,N-dimethylformamide (1.5 mL) and to the solution was added potassium carbonate (30.4 mg, 0.220 mmol) at room temperature. The mixture was stirred at 40° C. for 1 hr. After cooling, the mixture was diluted with water and extracted with ethyl acetate. The combined organic layer was washed with water and brine, 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. The resulting solid was recrystallized from hexane to give the title compound as a solid (24.0 mg, 0.0564 mmol, 51%).

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