Aryl radical cyclization with alkyne followed by tandem carboxylation in methyl 4-tert-butylbenzoate-mediated electrochemical reduction of 2-(2-propynyloxy)bromobenzenes in the presence of carbon dioxide
作者:Asahi Katayama、Hisanori Senboku、Shoji Hara
DOI:10.1016/j.tet.2016.06.032
日期:2016.8
Constant current electrolysis of 2-(2-propynyloxy)bromobenzenes in DMF using an undivided cell equipped with a Pt cathode and an Mg anode in the presence of carbon dioxide and an electron transfer mediator, methyl 4-tert-butylbenzoate, resulted in aryl radical cyclization with a carbon–carbon triple bond followed by fixation of two molecules of carbon dioxide to give 2,2-ring-fused succinic acid derivatives
使用配备有Pt阴极和Mg阳极的不分隔电池在二氧化碳和电子转移介体甲基4-叔存在下,在DMF中恒流电解2-(2-丙炔氧基)溴苯苯甲酸丁酯,通过碳-碳三键使芳基自由基环化,然后固定两个二氧化碳分子,以中等至良好的产率得到2,2环稠合的琥珀酸衍生物。通过芳基自由基环化成功地构建了二氢苯并呋喃,二氢吲哚,二氢苯并噻吩和茚满以及四氢吡喃骨架,并且先后发生了独特的串联羧化反应以生成琥珀酸。所得的琥珀酸衍生物之一,即3-羧基-2,3-二氢苯并呋喃-3-基乙酸已成功地用于合成由2,3-二氢苯并呋喃和γ-丁内酯组成的新型螺化合物。分两步走高产。