TFA-promoted (hetero)arylation/hydroxylation of quinoxaline-2-one derivatives with electron-rich aromatic compounds

A metal- and solvent-free, one-pot and TFA-promoted method for the construction of hetero/aryl-substituted quinoxalin-2-ones, pyrazin-2(1 )-ones, and pyrimidin-4(3 )-ones is reported. This method involves the reaction of chloro-derivatives of nitrogen heterocycles with electron-rich arenes/heteroarenes, followed by hydroxylation. This protocol is easy to use, providing access to (hetero)aryl-substituted -heterocycles in good yields.