Formic Acid → 6-Chloro-2-ethyl-5-(methylamino)-1-(4-{2-[({[(4-methylphenyl)sulfonyl]amino}carbonyl)amino]ethyl}phenyl)-1H-benzimidazole

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Reaction Conditions

Reaction Steps

A solution of acetic anhydride (0.14 ml) in THF (5 ml) was added formic acid (0.06 ml, 1.65 mmol) at 0° C. under nitrogen and the mixture was stirred at 60° C. for 2 h. Then the mixture was recooled to 0° C. and was added 6-Chloro-1-[4-(2-chloroethyl)phenyl]-2-ethyl-1H-benzimidazol-5-ylamine (Example 110, step 6, 100 mg, 0.3 mmol) in THF (2 ml). The mixture was stirred at room temperature for 2 h. The volatile component was removed under reduced pressure, and the residue was dissolved with ethyl acetate (100 ml). The organic layer was washed with 2N aqueous NaOH (50 ml), brine (50 ml), then dried (Na2SO4). After removal of solvent, the crude product was purified by flash column chromatography eluting with hexane/ethyl acetate (1:10) to afford 68 mg (67%) of the title compound as pale yellow solids.

Provenance & Evidence