Photochemical Nickel-Catalyzed C–H Arylation: Synthetic Scope and Mechanistic Investigations
作者:Drew R. Heitz、John C. Tellis、Gary A. Molander
DOI:10.1021/jacs.6b04789
日期:2016.10.5
An iridium photocatalyst and visible light facilitate a room temperature, nickel-catalyzed coupling of (hetero)aryl bromides with activated α-heterosubstituted or benzylic C(sp3)–H bonds. Mechanisticinvestigations on this unprecedented transformation have uncovered the possibility of an unexpected mechanism hypothesized to involve a Ni–Br homolysis event from an excited-state nickel complex. The resultant
铱光催化剂和可见光促进了(杂)芳基溴化物与活化的α-杂取代或苄基C(sp3)-H键的室温镍催化偶联。对这种前所未有的转变的机理研究揭示了一种意外机制的可能性,该机制假设涉及来自激发态镍配合物的 Ni-Br 均裂事件。所得溴自由基被认为会提取弱 C(sp3)-H 键以生成可参与 Ni 催化芳基化的反应性烷基自由基。有证据表明,铱光催化剂通过三重态-三重态能量转移促进镍激发和溴自由基的产生。
Photosubstitution Reaction of Cyanoaromatics with Aliphatic Amides
Organo‐Photoredox Catalyzed C(sp<sup>3</sup>)−H Bond Arylation of Aliphatic Amides
作者:Yaping Yi、Chanjuan Xi
DOI:10.1002/cssc.202301585
日期:2024.4.22
A C(sp3)−H bond arylation of aliphaticamides with cyanoaromatics has been achieved via photoredox catalysis, which could be realized at room temperature with visible light source and metal-free catalyst. Quinuclidine is employed as an efficient HAT reagent and aliphatic amide is employed as both reagent and solvent. This photocatalyzed transformation provides a convenient protocol to afford a board
通过光氧化还原催化,脂肪族酰胺与氰基芳族化合物发生AC(sp 3 )−H键芳基化反应,可在室温下用可见光源和无金属催化剂实现。奎宁环被用作有效的 HAT 试剂,脂肪族酰胺被用作试剂和溶剂。这种光催化转化提供了一种方便的方案来提供一系列N-苄基酰胺。