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.
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
A copper-mediated C2-cyanation of indoles using cheap and commercially available acetonitrile as the "nonmetallic" cyanide source was achieved through sequential C-C and C-H bond cleavages. The installation of a removable pyrimidyl group on the indole nitrogen atom is the key for this C2 selectivity. This approach provides a novel and alternative route leading to indole-2-carbonitrile.