Nickel-Catalyzed Heteroarenes Cross Coupling via Tandem C–H/C–O Activation
作者:Ting-Hsuan Wang、Ram Ambre、Qing Wang、Wei-Chih Lee、Pen-Cheng Wang、Yuhua Liu、Lili Zhao、Tiow-Gan Ong
DOI:10.1021/acscatal.8b03436
日期:2018.12.7
Inert aryl methyl ethers as coupling components via C–O activation have been established with a Ni catalyst for C–H activation of heteroarene. The key to simultaneous C–H/C–O bond activation is the use of sterically demanding o-tolylMgBr. The protocol is effective for a wide scope of substrates including naphthyl methyl ethers, anisoles, and a variety of other heteroarene derivatives. Detailed mechanistic
Regioselective Halogenation of Arenes and Heterocycles in Hexafluoroisopropanol
作者:Ren-Jin Tang、Thierry Milcent、Benoit Crousse
DOI:10.1021/acs.joc.7b02920
日期:2018.1.19
halogenation of arenes and heterocycles with N-halosuccinimides in fluorinated alcohols is disclosed. Under mild condition reactions, a wide diversity of halogenated arenes are obtained in good yields with high regioselectivity. Additionally, the versatility of the method is demonstrated by the development of one-pot sequential halogenation and halogenation-Suzuki cross-couplingreactions.
The palladium-catalyzedarylation of alpha,alpha-disubstituted arylmethanols with aryl halides proceeds not only via C-H bondcleavage at the ortho-position, but also via cleavage of the sp(2)-sp(3) C-C bond with the liberation of ketones (beta-carbon elimination) to give the corresponding biaryls. Both reactions appear to occur through common arylpalladium(II) alcoholate intermediates. The results
An efficient class of bis-NHC salts: applications in Pd-catalyzed reactions under mild reaction conditions
作者:Chien-Cheng Chiu、Hui-Tzu Chiu、Dong-Sheng Lee、Ta-Jung Lu
DOI:10.1039/c8ra04094j
日期:——
(bis-NHC) salts that can be easily made from commercially available and inexpensive starting materials. The application of these salts to Pd-catalyzed reactions is described. The palladium (Pd) catalyst generated in situ was highly effective undermild reaction conditions.