Metal-free construction of tricyclic or tetracyclic compounds—acid-promoted synthesis of benzo[4,5]imidazo[2,1-a]isoindole and 1,2-dialkyl-2,3-dihydrobenzimidazoles
作者:Jinying Chen、Jinpeng Qu、Yuanqing Zhang、Yongxin Chen、Na Liu、Baohua Chen
DOI:10.1016/j.tet.2012.10.030
日期:2013.1
An environmental friendly, efficient, and easy to operate strategy for synthesizing of benzo[4,5]imidazo [2,1-a]isoindole and 1,2-dialkyl-2,3-dihydrobenzimidazoles via acid-promoted coupling of dialdehyde and o-diaminobenzene under metal-free conditions is described. A series of products were generated in good yields under mild conditions. (C) 2012 Elsevier Ltd. All rights reserved.