Construction of trinuclear N-fused hybrid scaffolds by coupling and cyclization of 2-bromoaryl- and 2-bromovinylimidazoles with ureas under recyclable Cu/C–Al2O3 catalysis
作者:Pham Duy Quang Dao、Seok Tae Park、Ho-Sang Sohn、Nam Sik Yoon、Chan Sik Cho
DOI:10.1016/j.tet.2021.132613
日期:2022.1
2-(2-Bromoaryl)- and 2-(2-bromovinyl)imidazoles are coupled and cyclized with cyclic ureas as building blocks under recyclable heterogeneous Cu/C–Al2O3 catalysis to afford a class of trinuclear N-fused hybrid scaffolds, benzo[4,5]imidazo[1,2-a]imidazo[1,2-c]quinazolines and benzo[4,5]imidazo[1,2-a]imidazo[1,2-c]pyrimidines, respectively. The Cu/C–Al2O3 catalytic system could be recovered and reused
2-(2-溴芳基)-和2-(2-溴乙烯基)咪唑在可回收的多相Cu/C-Al 2 O 3催化下以环状脲为结构单元偶联环化得到一类三核N-稠合杂化支架, 苯并[4,5]咪唑[1,2- a ]咪唑并[1,2- c ]喹唑啉和苯并[4,5]咪唑[1,2- a ]咪唑并[1,2- c ]嘧啶. Cu/C-Al 2 O 3催化体系可回收再利用3次,催化活性无任何损失。