Palladium-catalyzed ortho-arylation of benzamides via direct sp ~2 C-H bond activation

摘要

The palladium-catalyzed ortho-arylation of benzamides by aryl iodides has been demonstrated with the simplest amide CONH _2 as a directing group for the first time. This protocol can be applied to various benzamides and aryl iodides with both electron-donating and electron-withdrawing groups. In addition, the synthesized biphenyl-2-carboxamides can be further transformed to other biphenyl derivatives such as nitriles, carboxylic acids, carbamates, and amines.