A visible-light-accelerated
Rh(III)-catalyzed C–H annulation
of aromatic amines with bicyclic alkenes for the synthesis of benzocarbazole
derivatives was developed. In this approach, with the cooperation
of rhodium catalysis and visible-light irradiation, various aromatic
amines reacted with oxabicyclic alkenes and azabicyclic alkenes smoothly
at room temperature, delivering the corresponding bridged oxa or aza
tetrahydro benzocarbazoles in good to excellent yields. Moreover,
a series of benzo[b]carbazoles were synthesized conveniently
through further aromatization in one pot. The potential of this method
was demonstrated via directing-group removal, derivatization, a scale-up
reaction, and fluorescence investigations.
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