Ruthenium(II)-Catalyzed Construction of Isocoumarins via Dual C-H/C-C Activation of Sulfoxonium Ylides.

A ruthenium(II)-catalyzed annulation between two molecules of sulfoxonium ylides is achieved, generating a variety of substituted isocoumarins in reasonable yields. This strategy features dual C-H/C-C activation in one pot and has a wide substrate scope and good functional group tolerance.