Zeolite Immobilized Copper Catalyzed Conjugate Borylation of α,β-Unsaturated Compounds in Aqueous Media

An eco-friendly zeolite immobilized copper catalyzed cojugate borylation of alpha,beta-unsaturated compounds which was accomplished in aqueous media under mild conditions was reported. This method provided a direct and efficient pathway to achieve an important class of beta-borylated compounds. Desired products were obtained in good to excellent yields with broad substrate scope. The advantages of this newly developed method include operational simplicity, mild conditions, good functional group tolerance and recyclability of catalyst. Remarkably, this zeolite supported copper catalyst could be recovered easily by simple centrifugation and reused for seven times without any significant decrease of catalytic activity.