反应详情

Triphenylphosphine (1.1 equiv., 51.5 mmoles, 13.5 g) is added in small portions to a 0° C. solution of [5-Cyclopropyl-3-(2-trifluoromethoxy-phenyl)-isoxazol-4-yl]-methanol and carbon tetrabromide (1.1 equiv, 51.5 mmoles, 17.1 g) in dichloromethane (187.1 mL). The reaction mixture is stirred at ambient temperature for 15 h and concentrated under reduced pressure. The crude residue is purified via silica gel chromatography eluting with 5:1 hexanes/ethyl acetate) to afford the title compound (15 g, 88%) as a white powder.

1. concentrationconcentrated under reduced pressure
2. customThe crude residue is purified via silica gel chromatography
3. washeluting with 5:1 hexanes/ethyl acetate)