Regio- and stereoselective synthesis of bromoalkenes by homolytic hydrobromination of alkynes with hydrogen bromide
作者:Wataru Kumaki、Hidenori Kinoshita、Katsukiyo Miura
DOI:10.1016/j.tet.2022.132687
日期:2022.3
hydrobromination of terminal and internal alkynes with a commercially available solution of hydrogen bromide in acetic acid has been investigated for regio- and stereoselective synthesis of bromoalkenes. Under an aerobic atmosphere at room temperature, the reaction of ethynylarenes with a small excess of HBr efficiently gave (2-bromoethenyl)arenes with good to high E-selectivity. (Alk-1-ynyl)arenes, or internal
已经研究了用市售的溴化氢在乙酸中的溶液对末端和内部炔烃进行均裂氢溴化反应,以用于溴代烯烃的区域选择性和立体选择性合成。在室温下的有氧气氛下,乙炔基芳烃与少量过量的 HBr 反应有效地产生了具有良好至高E选择性的 (2-溴乙烯基) 芳烃。(Alk-1-ynyl) 芳烃或在 sp-碳上同时带有苯基和烷基的内部炔烃也经历了空气引发的溴化氢反应,在使用半当量 HBr 的动力学条件下表现出高Z选择性。