Direct oxidative C(sp(3))H/C(sp(2))H coupling reaction using recyclable Sr-doped LaCoO3 perovskite catalyst

A strontium-doped lanthanum cobaltite perovskite, La0.6Sr0.4CoO3, was prepared and utilized as a recyclable heterogeneous catalyst for the direct oxidative C(sp(3))H/C(sp(2))H coupling reaction between cyclic ethers and alkenes or coumarins to achieve corresponding alpha-functionalized ethers. The alpha-functionalization of cyclic thioethers or amides with alkenes or coumarins was also achieved via this protocol. The La0.6Sr0.4CoO3 catalyst exhibited better performance than a variety of homogeneous and heterogeneous catalysts. Utilizing a recyclable catalyst would offer a greener option for the direct oxidative C(sp(3))H/C(sp(2))H coupling reaction. To our best knowledge, the C(sp(3))H/C(sp(2))H coupling between olefins and ethers to generate alpha-functionalized ethers using a heterogeneous catalyst has not been previously reported, and the alpha-functionalization of cyclic thioethers or amides with alkenes or coumarins is new.