Palladium-Catalyzed Oxidative Heck Coupling Reaction for Direct Synthesis of 4-Arylcoumarins Using Coumarins and Arylboronic Acids

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

Palladium-Catalyzed Desulfitative Arylation by C–O Bond Cleavage of Aryl Triflates with Sodium Arylsulfinates

An efficient Pd-catalyzed desulfitative coupling reaction of sodium arylsulfinates as arylation reagents by C–O bond cleavage of aryl triflates was developed. With only 2 mol % of Pd­(OAc)₂ as catalyst and XPhos as ligand, the reaction proceeded well for a range of substrates