Selenium Radical Mediated Cascade Cyclization: Concise Synthesis of Selenated Benzofurans (Benzothiophenes)
作者:Cui An、Chen-Yuan Li、Xiao-Bo Huang、Wen-Xia Gao、Yun-Bing Zhou、Miao-Chang Liu、Hua-Yue Wu
DOI:10.1021/acs.orglett.9b02315
日期:2019.9.6
AgNO2-catalyzed radical cyclization of 2-alkynylanisoles (or 2-alkynylthioanisoles), Se powder, and arylboronic acids. This method enables the construction of a benzofuran (benzothiophene) ring, two C-Se bonds, and a C-O(S) bond as well as the cleavage of a C-O(S) bond in a single step. Preliminary mechanistic studies imply that the AgNO2-catalyzed cyclization proceeds via an aryl selenium radical intermediate
在这项工作中提出的是一种新的方法,用于通过AgNO2催化的2-炔基苯甲醚(或2-炔基硫苯甲醚),Se粉和芳基硼酸的自由基环化来合成硒化苯并呋喃(或苯并噻吩)。这种方法可以一步构建苯并呋喃(苯并噻吩)环,两个C-Se键和一个CO(S)键,以及一个CO(S)键的裂解。初步的机理研究表明,AgNO2催化的环化反应是通过芳基硒自由基中间体进行的。