反应详情

17.6 ml (180 mmol) of boron tribromide are added dropwise, at −30° C., to a solution of 21.2 g (85 mmol) of 2-phenyl-2-methyl-8-methoxyquinoline in 500 ml of methylene chloride. The cooling bath is then removed and the reaction medium is stirred for 3 hours until it has returned to ambient temperature. The reaction mixture is then poured onto ice and the medium is basified using sodium hydrogencarbonate. The medium is subsequently extracted with 3×200 ml of methylene chloride. The organic phases are combined, dried over magnesium sulfate, filtered and evaporated under vacuum. The residue is purified by silica gel chromatography (eluent: ethyl acetate/cyclohexane 3/7) to give 12.7 g of 2-phenyl-3-methyl-8-hydroxyquinoline in the form of a colorless oil. (Yield: 64%)

1. customThe cooling bath is then removed
2. customhas returned to ambient temperature
3. additionThe reaction mixture is then poured onto ice
4. extractionThe medium is subsequently extracted with 3×200 ml of methylene chloride
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered
7. customevaporated under vacuum
8. customThe residue is purified by silica gel chromatography (eluent: ethyl acetate/cyclohexane 3/7)