2-bromo-3-methylbut-2-ene

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 1-(5,6-dichloro-1H-benzoimidazol-2-yl)-2,2,2-trifluoro-ethanone (577 mg) in THF (5 mL) at 0° C. was added Grignard reagent, which was freshly prepared from 2-bromo-3-methyl-2-butene (1.73 mL), a small iodine flake, and magnesium powder (347 mg) in THF (5 mL). The resulting mixture was 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 an off-white solid. 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 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 triturated with hexanes

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 1-(5,6-dichloro-1H-benzoimidazol-2-yl)-2,2,2-trifluoro-ethanone (577 mg) in THF (5 mL) at 0° C. was added Grignard reagent, which was freshly prepared from 2-bromo-3-methyl-2-butene (1.73 mL), a small iodine flake, and magnesium powder (347 mg) in THF (5 mL). The resulting mixture was 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 an off-white solid. 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 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 triturated with hexanes

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 1-(5,6-dichloro-1H-benzoimidazol-2-yl)-2,2,2-trifluoro-ethanone (577 mg) in THF (5 mL) at 0° C. was added Grignard reagent, which was freshly prepared from 2-bromo-3-methyl-2-butene (1.73 mL), a small iodine flake, and magnesium powder (347 mg) in THF (5 mL). The resulting mixture was 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 an off-white solid. 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 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 triturated with hexanes

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 1-(5,6-dichloro-1H-benzoimidazol-2-yl)-2,2,2-trifluoro-ethanone (577 mg) in THF (5 mL) at 0° C. was added Grignard reagent, which was freshly prepared from 2-bromo-3-methyl-2-butene (1.73 mL), a small iodine flake, and magnesium powder (347 mg) in THF (5 mL). The resulting mixture was 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 an off-white solid. 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 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 triturated with hexanes