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The regiospecific C-2-H arylation of N-3-substituted quinazolin-4(3H)-ones with a wide range of aryl or (hetero)aryl halides under microwave irradiation was studied. A ligand-dependent palladium/copper bicatalytic system was developed and allowed direct cross-coupling with a variety of (hetero)aryl halides. This useful and scalable procedure promotes the construction of C(sp2)-C(sp2) bonds from arenes or (hetero)arenes and aryl or (hetero)aryl bromides and chlorides in a time-efficient strategy. The extension of the reaction to various N-3-substituted quinazolin-4(3H)-ones with iodobenzene as well as the scope and limitations of the method were also investigated. The regiospecific C-2-H arylation of N-3-substituted quinazolin-4(3H)-ones with a wide range of aryl or (hetero)aryl halides under microwave irradiation is studied.
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Reference：
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem