Iron-Catalyzed 1,2-Selective Hydroboration of <i>N</i>‑Heteroarenes

A N₂-bridged diiron complex [Cp*­(Ph₂PC₆­H₄S)­Fe]₂­(μ-N₂) (<b>1</b>) has been found to catalyze the hydroboration of <i>N</i>-heteroarenes with pinacolborane, giving <i>N</i>-borylated 1,2-reduced products with high regioselectivity. The catalysis is initiated by coordination of <i>N</i>-heteroarenes to the iron center, while the B–H bond cleavage is the rate-determining step