Recent Advances in Thianthrenation/Phenoxathiination Enabled Site-Selective Functionalization of Arenes

Site-selective functionalization of simple arenes remains a paramount challenge due to the similarity of multiple C-H bonds in the same molecule with similar steric environment and electronic properties. Recently, the site-selective thianthrenation/phenoxathiination of arenes has become an attractive solution to reach this challenging goal and it has been applied in the late-stage functionalization of various bioactive molecules. This short review aims to summarize recent advances in the site-selective C-H functionalization of arenes via aryl thianthrenium salts, as well as mechanistic insights in the remarkable site-selectivity obtained in thianthrenation step. 1 Introduction 2 Site-Selective Thianthrenation of Arenes and Mechanistic Insight 3 Thianthrenation-Enabled Site-Selective Functionalization of Arenes 3.1 Thianthrenation-Enabled C(sp(2))-C Bond Formation Reaction 3.2 Thianthrenation-Enabled C(sp(2))-X Bond Formation Reaction 4 Conclusion and Outlook