5-bromo-1-(4-fluorophenyl)-1H-indazole → 1-Allyl-4-{2,2,2-trifluoro-1-[1-(4-fluorophenyl)-1H-indazol-5-yl]-1-hydroxyethyl}-1H-pyrrole-2-carbonitrile

Participants

Reaction Conditions

Reaction Steps

To a chilled (−78° C.) solution of 5-bromo-1-(4-fluorophenyl)-1H-indazole (1.3 g, 4.3 mmol, 1.1 equiv.) in 20 mL of THF was added n-BuLi (2.5 M in hexanes, 1.7 ml, 4.3 mmol, 1.1 equiv.) followed by a chilled (−78° C.) solution of 1-allyl-4-(2,2,2-trifluoroacetyl)-1H-pyrrole-2-carbonitrile (0.9 g, 3.9 mmol, 1 equiv.) in 3 mL of THF. After 30 minutes, the mixture was warmed to 0° C., quenched with water, diluted with brine, and extracted with EtOAc. The combined organics were dried, filtered, and concentrated in vacuo. The residue was purified by flash chromatography using EtOAc-hexanes (5-30% gradient) to afford 1.15 g (66%) of the title compound as an off-white solid. MS m/z 441.26 (MH+).

Provenance & Evidence