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 CH Cyanation of Arenes and Heteroarenes
作者:Jie Li、Lutz Ackermann
DOI:10.1002/anie.201409247
日期:2015.3.16
Carboxylate assistance proved to be the key for the success of efficient cobalt(III)‐catalyzedCH cyanations. Thus, an in situ generated cationic cobalt complex was identified as a versatile catalyst for the site‐selective synthesis of various aromatic and heteroaromatic nitriles with ample substrate scope.
A copper-mediated cyanation of heteroarene and arene C-H bonds has been developed, where ammonium iodide and DMF served as a safe cyanating combination. This procedure shows a broad substrate scope, allowing the facile access of 2-cyano indole, 1-cyano carbazole, 2-cyano pyrrole, and 2-cyano 1-pyridinyl benzene in high yields with good functional group tolerance.
We have developed a copper-mediated chelation-assisted direct aromatic ortho-C–H cyanation that uses AIBN as a safe cyanation reagent. The substrate scope included indoles, pyrroles, a carbazole, and a thiophene.
Copper-Catalyzed Regioselective Cyanation of Indoles via C-H Bond Activation with α-Aminoacetonitriles
作者:Muhammad Siddique Ahmad、Qifeng Wang、Kamel Meguellati、Ruqiya Qasim、Bing Zeng、Qing Zhang、Ehtesham Ul Haq Shah、Nasar Ud Din
DOI:10.1055/a-2088-8997
日期:2023.10
organic cyanating agent, 2-(diisopropylamino)acetonitrile is disclosed for the regioselectivesynthesis of cyanated indoles such as 2-cyanoindole and 3-cyanoindole derivatives. This method can tolerate a variety of functionalgroups and can furnish the corresponding cyanated products in moderate to high yields. Moreover, Cu/PhSiH3 system has been identified for the regioselective cleavage of C–H bonds