A vial was charged with copper acetate (77 mg, 0.425 mmol), ethyl 2-amino-5-phenylthiophene-3-carboxylate (100 mg, 0.404 mmol), phenylboronic acid (99 mg, 0.809 mmol), dichloromethane (2 ml), and triethylamine (0.113 ml, 0.809 mmol). The blue-green reaction mixture was magnetically stirred for 19 hours and then concentrated to a volume of 0.5 mL. The crude reaction mixture was purified by silica gel chromatography (7-60% dichloromethane/hexanes) to afford ethyl 2-anilino-5-phenylthiophene-3-carboxylate.
