B(C 6 F 5 ) 3 -Catalyzed [4 + 2] Cyclization Strategy: Synthesis and Photophysical Properties of 5 H -Naphtho[2,3- c ]carbazole-8,13-dione Derivatives.

In this paper, a series of novel carbazolequinones were efficiently obtained by a B(C 6 F 5 ) 3 -catalyzed [4 + 2] cyclization reaction. This protocol not only had a simple operation, broad substrate range, and high atomic economy, but also had a low catalyst loading and avoided using metal catalysts. In addition, we constructed diverse new carbazole-fused compounds under different reduction conditions. The results of photophysical characterization showed that the structure of carbazole-fused derivatives had a significant impact on the fluorescence properties.