描述了 Ni( II ) 催化的各种导向基团与炔烃的芳族同系化,通过C-X 键断裂、炔烃插入和 C-H 活化提供高度取代的萘产物。该反应在吡唑类、咪唑并吡啶类、苯并咪唑并噻唑类、噻唑类和三唑类等多种导向基团与炔烃的作用下进行,以中等至高产率提供高度取代的萘。Ni( II )-络合物、锌粉和碱的简单、直接组合促进了这种转变。
Rhodium-Catalyzed Oxidative 1:1, 1:2, and 1:4 Coupling Reactions of Phenylazoles with Internal Alkynes through the Regioselective Cleavages of Multiple C−H Bonds
selectively through the coupling of 1-phenylpyrazole and diphenylacetylene in 1:1, 1:2, and 1:4 manners, respectively. The reactions preferentially take place at the electron-deficient sites on the aromatic substrates. A comparison of reactivities of variously substituted and deuterated substrates sheds light on the mechanism of C−H bond cleavage steps. The reaction pathway is highly dependent on reaction
Switching the Reactivity of the Nickel-Catalyzed Reaction of 2-Pyridones with Alkynes: Easy Access to Polyaryl/Polyalkyl Quinolinones
作者:Namrata Prusty、Smruti Ranjan Mohanty、Shyam Kumar Banjare、Tanmayee Nanda、Ponneri C. Ravikumar
DOI:10.1021/acs.orglett.2c02021
日期:2022.8.26
with alkynes has been achieved. A change in the reaction pathway was achieved by tuning the reaction conditions and incorporating a directing group. A wide variety of substrates and alkynes are amenable to this transformation. The key to success for this transformation is the use of sodium iodide as an additive. More importantly, we detected the five-membered metallacycle intermediate through HRMS
Three-component synthesis of <i>N</i>-naphthyl pyrazoles <i>via</i> Rh(<scp>iii</scp>)-catalyzed cascade pyrazole annulation and Satoh–Miura benzannulation
作者:Demao Chen、Liyun Zhou、Yunyun Liu、Jie-Ping Wan
DOI:10.1039/d3cc00649b
日期:——
pyrazoles has been realized by the direct three-component reactions of enaminones, aryl hydrazine hydrochlorides and internal alkynes via Rh(III) catalysis. The synthetic reactions employing simple substrates lead to simultaneous construction of dual cyclic moieties, including a pyrazole ring and a phenyl ring, via sequential formation of two C–N and three C–C bonds.
N-萘基吡唑的合成是通过烯胺酮、芳基肼盐酸盐和内炔烃在Rh( III )催化下的直接三组分反应实现的。使用简单底物的合成反应通过连续形成两个 C-N 键和三个 C-C键,导致同时构建双环部分,包括吡唑环和苯环。
Fluorescent Naphthyl- and Anthrylazoles from the Catalytic Coupling of Phenylazoles with Internal Alkynes through the Cleavage of Multiple CH Bonds