25251-55-2Relevant articles and documents
para-Selective C?H Borylation of Aromatic Quaternary Ammonium and Phosphonium Salts
Chen, Yu,Deng, Zhangming,Liang, Yong,Lu, Shuo,Ma, Jiawei,Qin, Shengmeng,Zheng, Tianyu
supporting information, (2022/03/31)
Aromatic ammonium and phosphonium salts are important synthetic intermediates and multifunctional materials, but para-selective functionalization of the aromatic salts remains a challenge. Here we develop an ionic ligand based on our newly designed “biphenyl-phenanthroline” skeleton and realize the Ir-catalyzed para-selective C?H borylation of seven types of aromatic quaternary ammonium and phosphonium salts. Gram-scale transformation, late-stage elaboration for drug molecule, and diversification of borylated products demonstrate the potential utility of this reaction. The mechanistic studies and computational analysis elucidate the origin of para-selectivity.