Copper(II)-Mediated Intramolecular Cyclization of (Z)-Chalcogenoenynes: Synthesis of 3-Halochalcogenophene Derivatives
作者:Daniela A. Barancelli、Ricardo F. Schumacher、Marlon R. Leite、Gilson Zeni
DOI:10.1002/ejoc.201100992
日期:2011.11
We present our results on the cyclization of (Z)-chalcogenoenynes mediated by copper(II) salts to afford 3-halochalcogenophenes in satisfactory yields through an intramolecular 5-endo-dig cyclization. The methodology was carried out using CuCl2 at 50 °C or CuBr2 at room temperature under an ambient atmosphere. The reaction took place under very mild reaction conditions and tolerated considerable functionality
我们展示了由铜 (II) 盐介导的 (Z)-硫属元素烯环化的结果,通过分子内 5-endo-dig 环化以令人满意的产率提供 3-卤代硫属元素烯。该方法是在 50 °C 下使用 CuCl2 或在室温下在环境气氛下使用 CuBr2 进行的。该反应在非常温和的反应条件下进行并且耐受相当大的官能度。在钯催化的与硼酸的交叉偶联反应中,将一种 3-溴-硒吩衍生物用作底物,以良好的收率得到 Suzuki 型产物。