反应详情

4-Fluorophenylacetone (388 μl, 2.9 mmol) in DCM (12 ml) was cooled to 0° C. and bromine (672 mg, 2.9 mmol) was slowly added. The mixture was stirred for 30 min and then concentrated in vacuo. The crude intermediate was added to a mixture of 6-chloro-1-(4-fluorophenyl)-1H-indazol-5-ol, (99c) (762 mg, 2.9 mmol) and potassium carbonate (804 mg, 5.8 mmol) in THF (12 ml). The mixture was stirred for 4 h, filtrated and concentrated. The crude product was purified by flash chromatography (EtOAc/heptane, product eluted at 40% EtOAc) to give the title compound (1.06 g, 88%).

1. concentrationconcentrated in vacuo
2. stirringThe mixture was stirred for 4 h
3. filtrationfiltrated
4. concentrationconcentrated
5. customThe crude product was purified by flash chromatography (EtOAc/heptane, product eluted at 40% EtOAc)