Metal-free acyl-directed electrophilic C–H borylation using just BBr3

The considerable utility of organoboranes in synthesis is firmly established,which is in a large part due to the power of the Suzuki-Miyaura cross-coupling reaction for con・structing C-C bonds.Therefore,discovering simple new routes to form desirable organoboranes continues to be of significant import.Methodologies that directly transform C-H into C-B are particularly desirable,especially if borylation occurs with excellent site selectivity and without precious metal catalysts due to their low crustal abundance,high cost and toxicity.