反应详情

To a 5 ml flask, (3,5-dibromo-4-methoxy-phenyl)-(7-phenyl-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl)-methanone (14 mg, 0.03 mmol) was dissolved in dichloromethane and then cooled to 0□. 1.0M Boron tribromide dissolved in dichloromethane (0.17 ml, 0.17 mmol) was added and then stirred at 0□ for 15 hours. After completion of the reaction, water was added thereto and the mixture was extracted with ethyl acetate and the combined organic layer was dried over anhydrous sodium sulfate (Na2SO4), filtered and evaporated under reduced pressure. The residue was purified by column chromatography on silica eluting with a solvent of dichloromethane:methanol=40:1. The fractions containing the product were collected and evaporated to obtain the target compound 20 as white solid (8.7 mg, 64%).

1. temperaturecooled to 0□
2. additionwas added
3. additionwas added
4. extractionthe mixture was extracted with ethyl acetate
5. dry with materialthe combined organic layer was dried over anhydrous sodium sulfate (Na2SO4)
6. filtrationfiltered
7. customevaporated under reduced pressure
8. customThe residue was purified by column chromatography on silica eluting with a solvent of dichloromethane
9. additionThe fractions containing the product
10. customwere collected
11. customevaporated