The direct arylation of azoles with arylboronic acids is effectively promoted by PdCl2 in the presence of copper
and iron salts under ligand and base-free conditions. This reaction can be applied to heterocycles such as benzothiazole,
benzoxazole, 1-methylbenzimidazole and 4,5-dimethylthiazole with moderate to good yields.
Keywords: Palladium, copper, iron, arylation, arylboronic acid.
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