Palladium‐Catalyzed Picolinamide‐Directed Benzylic C(
<i>sp</i>
<sup>3</sup>
)−H Chalcogenation with Diaryl Disulfides and Diphenyl Diselenide
作者:Kai Wang、Jiahao Hou、Changjun Zhang、Ke Cheng、Renren Bai、Yuanyuan Xie
DOI:10.1002/adsc.202000280
日期:2020.7.29
The first palladium‐catalyzed direct benzylic C(sp 3)−H chalcogenation with diaryl disulfides and diphenyl diselenide has been established. The coupling reaction proceeds between the thioether radical and palladiumcycle intermediate. Picolinamide serves as an excellent directing group for the C−H activation of benzylic C(sp 3)−H and can be easily removed. The current protocol exhibits a relatively
已经建立了第一个钯催化的直接苄基C(sp 3)-H与二芳基二硫化物和二苯基二硒化物的硫属化合物。偶联反应在硫醚基和钯环中间体之间进行。吡啶甲酸酰胺是苄基C(sp 3)-H的C-H活化的极好指导基团,可以很容易地除去。当前的协议表现出相对较宽的底物范围和较高的官能团兼容性。机理研究表明,钯(IV)中间体可能在反应过程中形成。