Boc Groups as Protectors and Directors for Ir-Catalyzed C−H Borylation of Heterocycles

Ir-catalyzed C−H borylation is found to be compatible with Boc protecting groups. Thus, pyrroles, indoles, and azaindoles can be selectively functionalized at C−H positions β to N. The Boc group can be removed on thermolysis or left intact during subsequent transformations.