An efficient protocol for the direct synthesis of 4-arylcoumarins via palladium-catalyzed oxidative Heck coupling reaction of coumarins and arylboronic acids was developed. 4- Arylcoumarins were obtained in moderate to excellent yields, and the reaction also showed tolerance toward functional groups such as hydro, methoxy, diethylamino, nitro, and chloro groups.
[Kuarm, B. Suresh; Madhav, J. Venu; Laxmi, S. Vijaya; Rajitha; Reddy, Y. Thirupathi; Reddy, P. Narsimha; Crooks, Peter A. Synthetic Communications, 2010 , vol. 40, # 22 p. 3358 - 3364]
