Abstract An efficient avenue for the direct N-arylation of nucleobases with arylboronic acids that is catalyzed by simple copper salts was discovered. The N-arylnucleobases were obtained in excellent yields at room temperature within 45 min when methanol and water were used as a mixed solvent. Under these conditions, the coupling reaction tolerates both electron-donating and electron-withdrawing substituents at the o-, m-, or p-positions of ...