Tandem synthesis of benzo[b]carbazoles and their photoluminescent properties.
5 H-Benzo[b]carbazoles were prepared through a tandem reaction between 2-ethynyl-N-triphenylphosphoranylidene anilines and α-diazoketones through ketenimine intermediates in moderate-to-good yields. By using this approach, benzo[b]benzo[5,6]indolo[3,2-h]carbazoles, fluoreno[9,1-ab]carbazoles, and fluoreno[9,1-ab]fluoreno[1',9':5,6,7]indolo[3,2-h]carbazoles were constructed in one pot. Moreover, the resulting products emitted light within the range 410-521 nm, with quantum yields of up to 62 %.
Department Of Chemistry, Zhejiang University, Hangzhou 310027 (P.R. China), Fax: (+86) 571-87951512.
Yanpeng
Y
Xing
Binbin
B
Hu
Qijun
Q
Yao
Ping
P
Lu
Yanguang
Y
Wang
benzocarbazoles; cyclization; photoluminescence; rearrangement; tandem reactions