反应详情

25 g 3,6-dibromocarbazole and 20.5 g phenylboronic acid were mixed in 150 mL water and 300 mL dioxane in glove box. Stir vigorously and add 45 g sodium carbonate. Finally add 3 g Pd2DBA3 and 1.5 g tri-t-butylphosphine. Stir and reflux overnight then cool and remove from glove box. Add water to precipitate white solid then filter and collect. Dissolve in dichloromethane and chromatograph on silica eluting with DCM:hexanes 1:2 and elute product as colorless solution which on evaporation and washing with hexanes gives the desired product in ˜80% yield as a fluffy white solid.

1. stirringStir
2. temperaturereflux overnight
3. temperaturethen cool
4. customremove from glove box
5. customAdd water to precipitate white solid
6. filtrationthen filter
7. customcollect
8. dissolutionDissolve in dichloromethane
9. washchromatograph on silica eluting with DCM:hexanes 1:2 and elute product as colorless solution which
10. customon evaporation
11. washwashing with hexanes