catalysis of copper, 2-aminophenols or 2-aminothiophenols reacted with thiocarbamoyl chlorides via a tandem manner, furnishing a series of 17 benzoheterocycles smoothly with good to excellent yields (70–91%). The broad substrate scope, short reaction time, mild react conditions, easy performance and nice yields make this approach attractive, showing its practical synthetic value for the preparation of some
were used as substrates. The C–H bond ortho to the amino group in the anilines was directly functionalized under cobalt-catalyzed conditions with high levels of functional group tolerance. Hypervalentiodine(III) was both an oxidant and a Lewis acid for this reaction. The mechanism study showed that this transformation may involve a radical process.
A new iron-catalyzed, direct C-H amination of azoles at C2 has been developed by usingformamides or amines as nitrogen sources. Imidazole is the only additive in the catalyst system and oxygen in air is employed during the transformation process.