Regioselective bromination of tetronic acid-derived γ-lactones and metal-catalyzed post-functionalization: an efficient access to new γ-ylidenetetronate derivatives
作者:Shinya Iikawa、Nicolas Chopin、Guillaume Pilet、Jean-Philippe Bouillon、Maurice Médebielle
DOI:10.1016/j.tetlet.2013.06.106
日期:2013.8
The synthesis of several methyl and benzyl γ-ylidenetetronates was accomplished and the bromination reactions of these derivatives, using bromine or N-bromosuccinimide (NBS), were found to occur under mild conditions. Several new brominated γ-unsaturated lactones derived from tetronic acid were prepared in moderate to good yields, with some of them characterized by single crystal X-ray diffraction
完成了几种甲基和苄基γ-γ-亚硝酸酯的合成,发现使用溴或N-溴代琥珀酰亚胺(NBS)的这些衍生物的溴化反应在温和条件下发生。以中等至良好的收率制备了几种衍生自四氢苯甲酸的新的溴化γ-不饱和内酯,其中一些特征在于单晶X射线衍射。在Sonogashira交叉偶联反应中,对两种溴衍生的γ-亚苄基甲基四酸酯进行了初步反应性研究,还制备了在Cu(I)催化条件下制备1,2,3-三唑衍生的γ-亚苄基甲基四酸酯。这些溴化的γ-亚苄基四价酸盐是生产多种γ-内酯的有用平台。