Regio- and chemoselective C-H chlorination/bromination of electron-deficient arenes by weak coordination and study of relative directing-group abilities

Facile synthesis of 2-amino-3-bromoquinolines by palladium-catalyzed isocyanide insertion and cyclization of gem-dibromovinylanilines

A novel and efficient synthesis of 2-amino-3-bromoquinolines through palladium-catalyzed isocyanide insertion followed by intramolecular cyclization of gem-dibromovinylanilines was developed.

DDQ: the chlorinating reagent and oxidant for the ligand-directed ortho-chlorination of 2-arylpyridines

Dual roles: DDQ behaved as both the chlorinating reagent and oxidant in palladium-catalyzed ligand-directed ortho-chlorination of 2-arylpyridines.

Twofold unsymmetrical C-H functionalization of PyrDipSi-substituted arenes: a general method for the synthesis of substituted meta-halophenols

Two-fold unsymmetrical functionalization of arenes, which includes sequential halogenation/oxygenation reactions, has been developed. This transformation allows for a general and efficient synthesis of substituted meta -halophenols from simple aryl iodides. Importantly, the PyrDipSi (2-diisopropylsilylpyrimidine) group can be easily removed or efficiently converted into valuable functionalities.

Pd(II)-catalyzed C-H iodination using molecular I2 as the sole oxidant

Pd-catalyzed ortho-C-H iodination directed by a weakly coordinating amide auxiliary using I2 as the sole oxidant was developed. This reaction is compatible with a wide range of heterocycles including pyridines, imidazoles, oxazoles, thiazoles, isoxazoles, and pyrazoles.