反应详情

To a solution of 4-nitro-1H-indazole (0.200 g, 1.226 mmol) in acetone (3 mL) cooled to 0° C., was added KOH (0.103 g, 1.839 mmol). After 15 minutes at 0° C., 1-(bromomethyl)-2,4-difluorobenzene (0.173 mL, 1.349 mmol) was added. The mixture was allowed to stir at ambient temperature overnight, concentrated and the residue purified on silica gel (5-25% EtOAc in hexanes) to provide 1-(2,4-difluorobenzyl)-4-nitro-1H-indazole (0.142 g, 40% yield) as a pale yellow solid.

1. concentrationconcentrated
2. customthe residue purified on silica gel (5-25% EtOAc in hexanes)