Copper-Mediated N-Arylation of Methyl 2-Aminothiophene-3-carboxylate with Organoboron Reagents.

The desired N-arylated 2-amino-thiophene derivatives (III) and (V) are obtained via Chan—Lam cross-coupling of aminothiophene (I) with both arylboronic acids (II) and aryl trifluoroborate salts (IV).