α,β-Enone Borylation by Bis(Pinacolato)Diboron Catalyzed by Cu(BTC) Using Cesium Carbonate as a Base.

Cu(BTC) (BTC: 1,3,5-benzenetricarboxylate) as a heterogeneous catalyst in the presence of cesium carbonate as a base is reported for the borylation of α,β-conjugated enones by bis(pinacolato)diboron (Bpin). According to the hot-filtration test, Cu(BTC) is acting as a heterogeneous catalyst. Further, Cu(BTC) exhibits a wide substrate scope and can be reused in consecutive runs, maintaining a crystal structure as evidenced by powder X-ray diffraction (XRD). A suitable mechanism is also proposed for this transformation using Cu(BTC) as catalyst.