Iron-Catalyzed 1,2-Selective Hydroboration of N-Heteroarenes

A N-2-bridged diiron complex [Cp*-(Ph2PC6H4S)Fe](2)(mu-N-2) (1) has been found to catalyze the hydroboration of N-heteroarenes with pinacolborane, giving N-borylated 1,2-reduced products with high regioselectivity. The catalysis is initiated by coordination of N-heteroarenes to the iron center, while the B-H bond cleavage is the rate-determining step.