Formation of Aryl- and Benzylboronate Esters by Rhodium-Catalyzed C−H Bond Functionalization with Pinacolborane
摘要:
Direct borylation of C-H bonds in aromatic compounds can be achieved by using the efficient homogeneous catalyst precursor [RhCl(PiPr3 )2 (N2 )] and pinacolborane (HBpin; see scheme). High selectivity for the benzyl positions, observed for toluene, p-xylene, and mesitylene, was attributed to the formation of η3 -benzyl intermediates.