Design of Hemilabile N,N,N-Ligands in Copper-Catalyzed Enantioconvergent Radical Cross-Coupling of Benzyl/Propargyl Halides with Alkenylboronate Esters
作者:Peng-Fei Wang、Jiao Yu、Kai-Xin Guo、Sheng-Peng Jiang、Ji-Jun Chen、Qiang-Shuai Gu、Ji-Ren Liu、Xin Hong、Zhong-Liang Li、Xin-Yuan Liu
DOI:10.1021/jacs.2c00957
日期:2022.4.13
halides with alkenylboronate esters is an appealing tool in the assembly of synthetically valuable enantioenriched alkenes owing to the ready availability, low toxicity, and air/moisture stability of alkenylboronate esters. Here, we report a copper/chiral N,N,N-ligand catalytic system for the enantioconvergent cross-coupling of benzyl/propargyl halides with alkenylboronate esters (>80 examples) with good
对映收敛基团 C(sp 3 )–C(sp 2) 烷基卤化物与烯基硼酸酯的交叉偶联是合成有价值的对映体富集烯烃的一种有吸引力的工具,因为烯基硼酸酯易于获得、低毒性和空气/水分稳定性。在这里,我们报告了一种铜/手性 N,N,N-配体催化体系,用于苄基/炔丙基卤化物与烯基硼酸酯(>80 个实例)的对映收敛交叉偶联,具有良好的官能团耐受性。成功的关键是通过在一个配位喹啉环的邻位安装空间位阻来合理设计半可溶性N,N,N-配体。因此,新设计的配体不仅可以促进三齿形式的自由基交叉偶联过程,还可以对二齿形式的高反应性烷基自由基进行对映控制。