Cut and paste! A Cu‐catalyzed aromaticCHcyanation with acetonitrile as the nitrile source by CCNcleavage has been developed (see scheme; TMEDA=N,N,N′,N′‐tetramethylethylenediamine). The reaction is catalytic in copper, and it is found that using (Me3Si)2 as an additive plays a critical role in promoting CCNcleavage and enhancing the reaction rate.
Cobalt-Catalyzed C–H Cyanation of (Hetero)arenes and 6-Arylpurines with <i>N</i>-Cyanosuccinimide as a New Cyanating Agent
作者:Amit B. Pawar、Sukbok Chang
DOI:10.1021/ol503680d
日期:2015.2.6
A cobalt-catalyzed C–H cyanation reaction of arenes has been developed using N-cyanosuccinimide as a new electrophilic cyanating agent. The reaction proceeds with high selectivity to afford monocyanated products with excellent functional group tolerance. Substrate scope was found to be broad enough to include a wide range of heterocycles including 6-arylpurines.
Rhodium(<scp>iii</scp>)-catalyzed aromatic C–H cyanation with dimethylmalononitrile as a cyanating agent
作者:He Li、Sheng Zhang、Xiaoqiang Yu、Xiujuan Feng、Yoshinori Yamamoto、Ming Bao
DOI:10.1039/c8cc08930b
日期:——
A rhodium-catalyzed aromatic C–H bond direct cyanation with safe, bench-stable, and commercially available dimethylmalononitrile as the cyanating agent has been successfully developed by using copper oxide as a promotor. Pyridine, quinoline, pyrimidine and pyrazole were used as the directing group in this type of C–H bond direct cyanation reaction.
Copper-Mediated Direct Aryl C–H Cyanation with Azobisisobutyronitrile via a Free-Radical Pathway
作者:Hao Xu、Peng-Tang Liu、Yun-Hui Li、Fu-She Han
DOI:10.1021/ol401404y
日期:2013.7.5
An unprecedented protocol for the copper-mediated direct cyanation of aryl C-H by employing 2,2'-azobisisobutyronitrwile (AIBN) as a free radical "CN" source is presented. The protocol not only provides a more efficient pathway for the synthesis of aryl nitriles in terms of the yields and the loading amount of copper salts but also, more importantly, represents a novel strategy for aryl C-H cyanation via a CN free-radical mechanism as compared to the CN anion-participating protocols often reported.
Rhodium Catalyzed Cyanation of Chelation Assisted C–H Bonds
A rhodium-catalyzed cyanation of chelation assisted C-H bonds is described employing N-cyano-N-phenyl-p-methylbenzenesulfonamide as an efficient cyanating reagent. The present method allowed the synthesis of various benzonitirle derivatives in good to excellent yield. A number of chelating groups are also effective in the present cyanation of C-H bonds. In addition, the developed methodology was applied in the formal synthesis of the isoquinoline alkaloid, menisporphine.