反应详情

100 mg (0.4 mmol) of compound 7-methoxy-2-phenyl-chromen-4-one obtained in Example 2 was dissolved in methylenechloride, and 2.0 molar equivalents of BBr3 was added thereto. The mixture was stirred for 1 hour. Methanol was added to the mixture, and then solvent was removed by distillation under reduced pressure. The residue was purified by silica gel column chromatography (eluent: methylenechloride/methanol=5/95, v/v) to give the title compound in a yield of 64%.

1. customsolvent was removed by distillation under reduced pressure
2. customThe residue was purified by silica gel column chromatography (eluent: methylenechloride/methanol=5/95, v/v)