Ru‐catalyzed direct CH activation/meta‐bromination of arenes bearing pyridyl, pyrimidyl, and pyrazolyl directing groups has been developed. A series of bromo aryl pyridines and pyrimidines have been synthesized, and further coupling reactions have also been demonstrated for a number of representative functionalized arenes. Preliminary mechanistic studies have revealed that this reaction may proceed through
heterogeneous ruthenium catalyst for meta‐selective C−H functionalizations, which enabled remote halogenations with excellent site selectivity and ample scope. The versatile heterogeneous Ru@SiO2 catalyst was broadly applicable and could be easily recovered and reused, which set the stage for the direct fluorescent labeling of purines. In contrast to palladium, rhodium, iridium, or cobalt complexes, solely
The first electrochemical transition-metal-catalyzed meta-C−H functionalization has been accomplished, affording the positionally selective bromination product in an undivided cell by the catalysis of readily available RuCl3⋅3 H2O with aqueous HBr as the brominating agent.
第一个电化学过渡金属催化的间位-C−H 官能化已经完成,通过容易获得的 RuCl 3 ⋅3 H 2 O 和水性 HBr 作为溴化剂的催化作用,在未分割的电池中提供了位置选择性的溴化产物。