A General and Special Catalyst for Suzuki-Miyaura Coupling Processes
作者:Wenjun Tang、Andrew G. Capacci、Xudong Wei、Wenjie Li、Andre White、Nitinchandra D. Patel、Jolaine Savoie、Joe J. Gao、Sonia Rodriguez、Bo Qu、Nizar Haddad、Bruce Z. Lu、Dhileepkumar Krishnamurthy、Nathan K. Yee、Chris H. Senanayake
DOI:10.1002/anie.201002404
日期:2010.8.9
Biaryl monophosphorus ligands containing a 2,3‐dihydrobenzo[d][1,3]oxaphosphole framework are highly effective for the palladium‐catalyzed Suzuki–Miyaura cross‐coupling reactions of a wide range of substrates. Ligand 1 has demonstrated excellent performance for coupling reactions of extremely hindered arylboronic acids.
含有2,3-二氢苯并[ d ] [1,3]恶唑骨架的联芳基单磷配体对于钯催化的多种底物的Suzuki-Miyaura交叉偶联反应非常有效。配体1已显示出极受阻碍的芳基硼酸偶联反应的优异性能。
A Planar-Chiral Phosphino(alkenyl)ferrocene for Suzuki-Miyaura C-C Coupling Reactions
作者:Dieter Schaarschmidt、Martin Grumbt、Alexander Hildebrandt、Heinrich Lang
DOI:10.1002/ejoc.201402861
日期:2014.10
applied in the presence of palladium in Suzuki–Miyauracouplings for the synthesis of sterically congested biaryls. The catalytic activity arises from homogeneous palladium phosphine complexes, of which the potential pre-catalyst [Pd(4)2Cl2] was characterized structurally. The catalytic system is excellently suited for the synthesis of tri-ortho-substituted biaryls under mild conditions (0.1 mol-%, 50–100
Evaluation of the Transferability of the “Flexible Steric Bulk” Concept from N‐Heterocyclic Carbenes to Planar‐Chiral Phosphinoferrocenes and their Electronic Modification
作者:Marcus Korb、Dieter Schaarschmidt、Martin Grumbt、Matthias König、Heinrich Lang
DOI:10.1002/ejic.202000414
日期:2020.8.23
concept of “flexible steric bulk” is discussed at 2‐phenylvinyl‐1‐phosphinoferrocenes. The introduction of freely rotatable 1'‐silyl groups increases the catalytic productivity within the synthesis of tri‐ortho‐substituted biaryls by Suzuki–Miyaura C,C cross‐coupling reactions, giving higher yields with 1/4 of catalyst concentration than for the non‐silylated derivatives. Electronic modification of
Highly Active Palladium Catalysts Supported by Bulky Proazaphosphatrane Ligands for Stille Cross-Coupling: Coupling of Aryl and Vinyl Chlorides, Room Temperature Coupling of Aryl Bromides, Coupling of Aryl Triflates, and Synthesis of Sterically Hindered Biaryls
作者:Weiping Su、Sameer Urgaonkar、Patrick A. McLaughlin、John G. Verkade
DOI:10.1021/ja0450096
日期:2004.12.1
R' = i-Bu, 1; R = Bz, R' = i-Bu, 3; R = R' = Bz, 4] for palladium-catalyzed Stille reactions of aryl chlorides is described. Catalysts derived from ligands 1 and 4 efficiently catalyze the coupling of electronically diverse aryl chlorides with an array of organotin reagents. The catalyst system based on the ligand 3 is active for the synthesis of sterically hindered biaryls (di-, tri-, and tetra-ortho
Planar Chiral P,O‐Compounds Derived from Ferrocenyl Aryl Ethers
作者:Dieter Schaarschmidt、Heinrich Lang
DOI:10.1002/ejic.201000722
日期:2010.10
spectroscopic studies and single-crystal X-ray diffraction analysis. Thus available planar chiral P,O-ferrocenes can successfully be applied in the palladium-catalyzed Suzuki coupling of diverse aryl halides and aryl boronic acids. The aforementioned systems allow the activation of carbon-chlorine bonds in an efficient way and tolerate catalyst loadings as low as 10 ppm. Noteworthy is their remarkable ability
报道了 FcOC 6 H 4 -4-tBu (1) [Fc = (η 5 -C 5 H 4 )(η 5 -C 5 H 5 )Fe] 与 nBuLi/tmeda 的邻位定向锂化(tmeda = 四甲基乙二胺)。在该反应中,发生多金属化产生新的 1,2-官能化 P,O-衍生物,根据 NMR 光谱研究和单晶 X 射线衍射分析确定,该衍生物含有多达四个磷酰基部分。因此,可用的平面手性 P,O-二茂铁可以成功地应用于钯催化的各种芳基卤化物和芳基硼酸的 Suzuki 偶联。上述系统允许以有效的方式活化碳-氯键,并能耐受低至 10 ppm 的催化剂负载。值得注意的是它们在温和的反应条件下经济地生成受阻联芳的非凡能力。