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0 °C

To 1-(5,6-dichloro-1H-benzoimidazol-2-yl)-2,2,2-trifluoro-ethanone (535 mg) in THF (10 mL) at −78° C. was added 1-propynyl magnesium bromide (8 mL of 0.5 M in THF) dropwise. The resulting mixture was then stirred at 0° C. for 3 hr. The reaction was quenched with H2O and 1N HCl, extracted with EtOAc, dried over Na2SO4, filtered, and concentrated to yield a residue. The residue was purified by flash chromatography with Biotage 40s+ column and elution with 10%-40% EtOAc/hexanes to yield a yellow solid. The yellow solid was dissolved in a minimal amount of CH2Cl2 and triturated with hexanes to yield the title compound as a white solid.

1. customThe reaction was quenched with H2O and 1N HCl
2. extractionextracted with EtOAc
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated
6. customto yield a residue
7. customThe residue was purified by flash chromatography with Biotage 40s+ column and elution with 10%-40% EtOAc/hexanes
8. customto yield a yellow solid
9. customtriturated with hexanes