反应详情

As described in General Procedure J, a solution of 1-(4-isopropyl-7-methoxy-2,2-dimethyl-2H-chromen-6-yl)-ethanone (Compound 54, 752 mg, 2.43 mmol) in dichloromethane was treated with boron tribromide (1M in dichloromethane, 3.64 mL, 3.64 mmol) to afford the title compound as a bright yellow oil.