文摘
A challenging selective intermolecular cross-coupling and homocoupling of aryl鈥揳ryl or aryl鈥揳lkyl diazo compounds has been accomplished via a copper system, which afforded tetrasubstituted olefins in moderate to high yields with good to excellent Z-selectivity. This novel methodology enables rapid synthesis of tetrasubstituted olefins, which would find broad application in accessing maleimide libraries of nature products and bioactive small molecules.