Well-Defined Air-Stable Palladium HASPO Complexes for Efficient Kumada-Corriu Cross-Couplings of (Hetero)Aryl or Alkenyl Tosylates
作者:Lutz Ackermann、Anant R. Kapdi、Sabine Fenner、Christoph Kornhaaß、Carola Schulzke
DOI:10.1002/chem.201002386
日期:2011.3.1
Palladium complexes of representative heteroatom‐substituted secondary phosphine oxide (HASPO) preligands were synthesized and fully characterized, including X‐ray crystal structure analysis. Importantly, these well‐defined complexes served as highly efficientcatalysts for Kumada–Corriu cross‐couplingreactions of aryl, alkenyl, and even heteroaryl tosylates. Particularly, an air‐stable catalyst derived
代表的钯络合物ħ etero一汤姆取代小号econdary p hosphine ø西德(HASPO)preligands合成并充分表征,包括X射线晶体结构分析。重要的是,这些定义明确的络合物可作为Kumada-Corriu芳基,烯基乃至杂芳基甲苯磺酸酯交叉偶联反应的高效催化剂。特别是,由廉价的PinP(O)H衍生的空气稳定型催化剂显示出极高的催化效力,这导致在极低的反应条件下,在足够宽泛的反应条件下,低催化剂负载下的交叉偶联。
Synthesis of Substituted Monohalobenzenes via Ortho-Selective Cross-Coupling of Dihalobenzenes with Electron-Donating Ortho-Directing Groups
作者:Kei Manabe、Shunpei Ishikawa
DOI:10.1055/s-2008-1067270
日期:2008.10
Dihalobenzenes that possess directing groups such as OH, CH 2 OH, NH 2 , NHAc, or NHBoc were subjected to ortho-selective cross-coupling with Grignard reagents in the presence of palladium-based catalysts to give the corresponding substituted monohalobenzenes. For the dibromo- and dichlorophenols and anilines, hydroxylated terphenylphosphines 1 and 2 were found to be effective ligands for palladium
<i>Ortho</i>-Selective Cross-Coupling of Fluorobenzenes with Grignard Reagents: Acceleration by Electron-Donating<i>Ortho</i>-Directing Groups
作者:Kei Manabe、Shunpei Ishikawa
DOI:10.1055/s-2008-1067182
日期:2008.8
Fluorobenzenes with directing groups such as hydroxy, hydroxymethyl, and ammo underwent ortho-selective cross-coupling with Grignardreagents in the presence of palladium-based catalysts, with dichlorobis(tricyclohexylphosphine)palladium [PdCl 2 (PCy 3 ) 2 ] found to be the optimum catalyst. Fluoro and chloro groups at positions other than ortho to the directing groups survived under the reaction conditions
Pd-catalyzed protecting-group-free cross-couplings of iodophenols with atom-economic triarylbismuth reagents
作者:Maddali L.N. Rao、Suresh Meka
DOI:10.1016/j.tetlet.2019.151512
日期:2020.2
An efficient protocol for the protecting-group-free synthesis of unsymmetrical hydroxybiaryls via the Pd-catalyzedcross-couplings of unprotected iodophenols with triarylbismuth reagents is described. The presented protocols exhibits good to high yields of hydroxybiaryls.
Highly Ortho-Selective Cross-Coupling of Dichlorobenzene Derivatives with Grignard Reagents
作者:Shunpei Ishikawa、Kei Manabe
DOI:10.1021/ol702646s
日期:2007.12.1
Highly ortho-selective cross-coupling of dichlorobenzene derivatives with Grignard reagents was realized using a combination of Pd-2(dba)(3) and PCy3. Use of hydroxylated terphenylphosphines further improved the reactions of dichlorophenol and dichloroaniline.