Iron‐catalyzed C‐7 Selective NH<sub>2</sub> Amination of Indoles
Zhanlin Wang, Jin-Kai Cheng, Fei Wang
Abstract
Abstract 7‐Aminoindoles are important synthetic intermediates to a broad range of bioactive molecules. Transition metal‐catalyzed directed C−H amination is among the most straightforward route for their synthesis, whereas methods that could directly incorporate an NH 2 group in a highly selective manner remains elusive. Moreover, there is still high demand for the development of earth‐abundant metal catalysis for such attractive reactivity. We present here the first C‐7 selective NH 2 amination of indoles through a directed homolytic aromatic substitution (HAS) with iron‐aminyl radical. The reaction exhibits broad substrate scope, tolerates variety of functional groups, and is readily scalable with catalyst loading down to 0.1 mol % and turnover number (TON) up to 4500.