Synthesis of benzothieno[2,3-b]thiophenes, [2,3-b:3′,2′-d]-dithienothiophenes and their selenium derivatives via electrophilic cyclization and McMurry cyclization
摘要:
Benzothieno[2,3-b]thiophenes, [2,3-b:3',2'-d]-dithienothiophenes, and their selenium derivatives were synthesized in good yields from readily available 3-ethynyllithio-benzo[b]thiophenyllithio compounds, sulfur or selenium, and 2 equiv of acid chlorides. Two heteroarene rings were constructed by a twofold cyclization via an acid chloride-induced electrophilic ring closing and the McMurry cyclization using Zn/TiCl4 reagents. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis of benzothieno[2,3-b]thiophenes, [2,3-b:3′,2′-d]-dithienothiophenes and their selenium derivatives via electrophilic cyclization and McMurry cyclization
作者:Weizhi Geng、Hanliu Wang、Zitao Wang、Shaoguang Zhang、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1016/j.tet.2012.01.088
日期:2012.7
Benzothieno[2,3-b]thiophenes, [2,3-b:3',2'-d]-dithienothiophenes, and their selenium derivatives were synthesized in good yields from readily available 3-ethynyllithio-benzo[b]thiophenyllithio compounds, sulfur or selenium, and 2 equiv of acid chlorides. Two heteroarene rings were constructed by a twofold cyclization via an acid chloride-induced electrophilic ring closing and the McMurry cyclization using Zn/TiCl4 reagents. (C) 2012 Elsevier Ltd. All rights reserved.