开发了一种八面体 Ni-DMAP 配合物作为C- N 和C- S 交叉偶联和使用硼酸作为偶联剂的还原性硝基芳烃偶联的催化剂。胺、硫醇、叠氮化物和甲苯磺酰叠氮化物与硼酸的反应可以在 10 mol% 的催化剂存在下于 80 °C 的甲醇中实现,无需使用额外的碱。目前的协议在仲胺、硫醇和酚存在下对伯胺具有高度选择性。使用相同的催化剂也成功地实现了一系列硝基芳烃和硼酸的还原偶联。
Nickel/Photoredox Dual Catalytic Chan‐Lam Coupling of Aryl Azides and Arylboric Acids
作者:Xia Ge、Haojie Ji、Hongjian Lu
DOI:10.1002/cjoc.202400276
日期:2024.9.15
utilizes phenylboronic acids and arylazides as coupling agents in a redox-neutral environment, enabled by a synergistic nickel/photoredox catalytic system. This approach leverages a proton-coupled electron transfer mechanism to bypass the typical nitrene pathway associated with arylazides, which is prone to intramolecular rearrangement, C—H amination, and reductive hydrogenation. Notably, our method