Copper-Facilitated Suzuki Reactions: Application to 2-Heterocyclic Boronates
摘要:
The palladium-catalyzed Suzuki-Miyaura reaction has been utilized as one of the most powerful methods for C-C bond formation. However, Suzuki reactions of electron-deficient 2-heterocyclic boronates generally give low conversions and remain challenging. The successful copper(l) facilitated Suzuki coupling of 2-heterocyclic boronates that is broad in scope Is reported. Use of this methodology affords greatly enhanced yields of these notoriously difficult couplings. Furthermore, mechanistic investigations suggest a possible role of copper in the catalytic cycle.
Palladium-Catalyzed Suzuki−Miyaura Coupling of Pyridyl-2-boronic Esters with Aryl Halides Using Highly Active and Air-Stable Phosphine Chloride and Oxide Ligands
作者:David X. Yang、Steven L. Colletti、Kevin Wu、Maoying Song、George Y. Li、Hong C. Shen
DOI:10.1021/ol802642g
日期:2009.1.15
The palladium-catalyzed Suzuki−Miyaura coupling of pyridyl-2-boronic esters provided an efficient approach to useful biaryl building blocks containing a 2-pyridyl moiety. The convenient reaction protocol demonstrates its potentially wide applications in medicinal chemistry.
Copper-Facilitated Suzuki Reactions: Application to 2-Heterocyclic Boronates
作者:James Z. Deng、Daniel V. Paone、Anthony T. Ginnetti、Hideki Kurihara、Spencer D. Dreher、Steven A. Weissman、Shaun R. Stauffer、Christopher S. Burgey
DOI:10.1021/ol802556f
日期:2009.1.15
The palladium-catalyzed Suzuki-Miyaura reaction has been utilized as one of the most powerful methods for C-C bond formation. However, Suzuki reactions of electron-deficient 2-heterocyclic boronates generally give low conversions and remain challenging. The successful copper(l) facilitated Suzuki coupling of 2-heterocyclic boronates that is broad in scope Is reported. Use of this methodology affords greatly enhanced yields of these notoriously difficult couplings. Furthermore, mechanistic investigations suggest a possible role of copper in the catalytic cycle.
Yttrium‐Catalyzed
<i>ortho</i>
‐Selective C−H Borylation of Pyridines with Pinacolborane
作者:Yuncong Luo、Shengjie Jiang、Xin Xu
DOI:10.1002/anie.202117750
日期:2022.5.16
The ortho-selective C−Hborylation of a wide range of pyridines using pinacolborane was achieved through yttrium catalysis. Notably, the possible hydroboration side reaction was effectively suppressed by using the proper ligand/metal combination. The resultant 2-pyridyl boronates were subjected to further transformations such as a Suzuki–Miyaura coupling or the Chan–Lam amination.