Palladium-Catalyzed Direct Arylation of Polyfluoroarenes for Accessing Tetra-<i>ortho</i>-Substituted Biaryls: Buchwald-type Ligand Having Complementary −PPh<sub>2</sub> Moiety Exhibits Better Efficiency
作者:On Ying Yuen、Man Pan Leung、Chau Ming So、Raymond Wai-Yin Sun、Fuk Yee Kwong
DOI:10.1021/acs.joc.8b01176
日期:2018.8.17
The first general examples of direct C–H arylation of electron-deficient polyfluoroarenes with challenging di-ortho-substituted aryl(heteroaryl) chlorides for tetra-ortho-substituted biaryl synthesis are reported. Key to success is the use of Buchwald-type biaryl phosphine ligand, notably with inexpensive −PPh2 moiety (instead of −PCy2 group). Pd(OAc)2 associated with ligand L9 exhibits even higher