Potassium Carbonate → HCID 57785936, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-[2-{[4-bromo-2-(trifluoromethoxy)phenyl]amino}-4-chloro-7-(1-ethylpropyl)-1H-benzimidazol-1-yl]butan-1-ol (Reference Example 62; 1.63 g, 2.97 mmol) in tetrahydrofuran (40 mL) and triethylamine (2.0 mL) was added methanesulfonyl chloride (0.69 mL, 11.9 mmol) at 0° C. The mixture was stirred at 0° C. for 4 hr, diluted 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. A mixture of the resulting mesylate, potassium carbonate (2.04 g, 14.8 mmol) in N,N-dimethylformamide (15 mL) was stirred at 70° C. 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 0-30% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the solid, which was washed with n-hexane to give the title compound as a colorless powder (770 mg, 1.45 mmol, 49%).

Provenance & Evidence