Guodong Yuan, Haiquan Liu, Jilong Gao, Hongjuan Xu, Liu Jiang, Xiaoxia Wang and Xin Lv
An efficient and facile synthesis of benzimidazo[1,2-a]benzimidazoles via copper-catalyzed domino addition/double cyclization,
RSC Advances, 2014, 4, 21904-21908
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http://dx.doi.org/10.1039/C4RA01181CЗаранее спасибо!!!