Iodine → 2-(5,6-Dichloro-1H-benzoimidazol-2-yl)-1,1,1-trifluoro-4-methyl-pent-3-en-2-ol

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Reaction Steps

To 1-(5,6-dichloro-1H-benzoimidazol-2-yl)-2,2,2-trifluoro-ethanone (565 mg) in THF (5 mL) at 0° C. was added Grignard reagent, which was freshly prepared from 1-bromo-2-methyl-propene (0.51 mL), a small iodine flake, and magnesium powder (146 mg) in THF (5 mL). The resulting mixture was then stirred at room temperature for 3 hr. The reaction was quenched with NH4Cl (sat. aq), filtered through a pad of Celite®, rinsed with EtOAc, the layers were separated, the aqueous layer 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 yellow solid.

Provenance & Evidence