Recent Progress in meta-/para-Selective Aromatic C-H Borylation

Organoboron compounds are important building blocks to create molecular diversity. Strategies that can transform the readily available hydrocarbons into these compounds by C-H borylation are highly attractive. In this context, significant progress has been made towards iridium-catalyzed C-H borylation. Because substituted arenes typically contain ortho-, meta- and para-C-H bonds, regiocontrol has been a long-standing challenge within this type of chemistry. During the past decade, significant progress has been made in the ortho-selective C-H borylation, while the meta-/para-selectivity is still challenging. This review aims to provide a comprehensive overview of this topic on meta-/para-selective aromatic C-H borylation by iridium catalysis. This topic is categorized into directed and non-directed C-H borylation.