Iron-Catalyzed Ipso-Nitration of Aryl Borides via Visible-Light-Induced β-Homolysis

Herein, we reported a practical method to realize ipso-nitration of boronic acids, their pinacol esters, and trifluoroborate salts with alkali metal salt NaNO3 as a nitrating reagent. A FeIII/FeIV catalytic cycle involving an unusual visible-light-induced β-homolysis pathway of the N–O bond in a simple iron complex effectively provides a nitryl radical as the key nitrating species. This protocol bears mild reaction conditions, a broad scope (up to 99% yield), good functional group compatibility, and convenient scale-up synthesis.