Efficient synthesis of α-substituted ethylphosphonates via CuH-catalyzed conjugate reduction of terminal alkenylphosphonate
作者:Li Zhang、Yewen Fang、Xiaoping Jin、Ting Guo、Ruifeng Li、Yan Li、Xie Li、Yi Yang、Meijuan Yuan、Zongming Tian
DOI:10.1016/j.tetlet.2017.10.045
日期:2017.11
An unprecedented approach toward synthesis of α-substituted ethylphosphonates based on CuH-catalyzed conjugate reduction of vinylphosphonates has been successfully developed. This protocol features mild conditions, broad substrate scope, good functional group compatibility, high overall efficiencies, and easy gram-scale synthesis. The Cu-catalyzed reduction takes place in a highly selective manner
基于CuH催化的乙烯基膦酸酯的共轭还原,成功开发了一种空前的合成α-取代的乙基膦酸酯的方法。该协议具有条件温和,底物范围广,官能团兼容性好,总体效率高以及易于克级合成的特点。在带有膦酰基和烷基或芳基取代的烯烃部分的烯基膦酸酯反应的情况下,Cu催化的还原以高选择性的方式在膦酰基取代的C C键上发生。此外,竞争反应的结果表明,铜催化的乙烯基膦酸酯的共轭还原比相应的丙烯酸酯反应更具挑战性和可重复性。