Directed Secondary C(sp³)–H Borylation by a Phenoxyimine Iridium Catalyst at Room Temperature

Here, we report that directed secondary C(sp³)-H borylation at room temperature was achieved by using phenoxyimine iridium complexes as catalysts. This reaction enables the introduction of a boryl group at the β position of a directing group, such as a pyridyl and pyrazolyl groups. Furthermore, it was indicated that the addition of a small amount of pinacolborane is important for the efficient generation of catalytically active species.