A C–H Borylation Approach to Suzuki–Miyaura Coupling of Typically Unstable 2–Heteroaryl and Polyfluorophenyl Boronates
摘要:
A method for the synthesis of biaryls and heterobiaryls from arenes and haloarenes without the intermediacy of unstable boronic acids is described. Pinacol boronate esters that are analogous to unstable boronic acids are formed in high yield by iridium-catalyzed C-H borylation of heteroarenes and fluoroarenes. These boronates are stable in the solid state or in solution and can be generated and used in situ. They couple with aryl halides in the presence of simple palladium catalysts, providing a convenient route to biaryl and heteroaryl products that have been challenging to prepare via boronic acids.
borylation of aromaticethers such as anisoles is of much interest and importance, but has remained a challenge to date. We report herein the catalytic ortho-selective C–H borylation of a wide range of aromaticethers with pinacolborane (HBpin) by rare-earth metallocene complexes. This protocol offers an efficient and straightforward route for the synthesis of a variety of borylated aromaticether derivatives
Iron-Catalysed C(sp2)-H Borylation Enabled by Carboxylate Activation
作者:Luke Britton、Jamie H. Docherty、Andrew P. Dominey、Stephen P. Thomas
DOI:10.3390/molecules25040905
日期:——
Arene C(sp2)-H bond borylation reactions provide rapid and efficient routes to synthetically versatile boronic esters. While iridium catalysts are well established for this reaction, the discovery and development of methods using Earth-abundant alternatives is limited to just a few examples. Applying an in situ catalystactivation method using air-stable and easily handed reagents, the iron-catalysed
C–H Borylation Catalysis of Heteroaromatics by a Rhenium Boryl Polyhydride
作者:Liam J. Donnelly、Teresa Faber、Carole A. Morrison、Gary S. Nichol、Stephen P. Thomas、Jason B. Love
DOI:10.1021/acscatal.1c00869
日期:2021.6.18
[ReH6(Bpin)(dppp)] 3. Combined X-ray crystallographic and DFT studies show that 2 is best described as a σ-borane complex, whereas 3 is a boryl complex. Significantly, the boryl complex 3 acted as a catalyst for the C(sp2)–Hborylation of a variety of heteroarenes (14 examples including furan, thiophene, pyrrole and indole derivatives) and displayed similar reactivity to the iridium analogues.
A C–H Borylation Approach to Suzuki–Miyaura Coupling of Typically Unstable 2–Heteroaryl and Polyfluorophenyl Boronates
作者:Daniel W. Robbins、John F. Hartwig
DOI:10.1021/ol301570t
日期:2012.8.17
A method for the synthesis of biaryls and heterobiaryls from arenes and haloarenes without the intermediacy of unstable boronic acids is described. Pinacol boronate esters that are analogous to unstable boronic acids are formed in high yield by iridium-catalyzed C-H borylation of heteroarenes and fluoroarenes. These boronates are stable in the solid state or in solution and can be generated and used in situ. They couple with aryl halides in the presence of simple palladium catalysts, providing a convenient route to biaryl and heteroaryl products that have been challenging to prepare via boronic acids.