反应详情

Neat 2-(4-bromo-2-hydroxy-5-methylphenyl)-1-azaprop-1-enyl acetate (103) (0.5 g, 1.748 mmol) was heated at 175° C. for 2 h then at 100° C. for 1 h. After cooling down to r.t., the dark brown solid was dissolved in DCM and subjected to silica gel flash chromatography (0-40% B, A: hexane; B: 50% EA in hexane) to give 6-bromo-3,5-dimethylbenz[d]isoxazole (104) (92 mg, yield: 23.3%; purity>95%) as yellow crystals.