Copper-catalyzed direct borylation of alkyl, alkenyl and aryl halides with B(dan)

Substitutional borylation of C(sp3 or sp2)–halogen bonds with an unsymmetrical diboron [(pin)B–B(dan)] was found to proceed smoothly under copper catalysis. A variety of masked alkyl-, alkenyl- and arylboron compounds [R–B(dan)] were straightforwardly accessible with high functional group compatibility in high yield.