Robust and Electron-Rich<i>cis</i>-Palladium(II) Complexes with Phosphine and Carbene Ligands as Catalytic Precursors in Suzuki Coupling Reactions
作者:Chuang-Yi Liao、Kai-Ting Chan、Cheng-Yi Tu、Yu-Wei Chang、Ching-Han Hu、Hon Man Lee
DOI:10.1002/chem.200801296
日期:2009.1.2
A new imidazolinium ligand precursor [L2H]Cl (2) was prepared in 86 % yield. Compared with its imidazolium counterpart, [L1H]Cl (1), 2 is very sensitive to moisture and can undergo ring‐opening reactions very readily. Palladium complexes with the ring‐opened productsfromimidazolinium salts were isolated and characterized by X‐ray crystallography. Theoretical studies confirmed that the imidazolinium
以86%的收率制备了新的咪唑啉鎓配体前体[L 2 H] Cl(2)。与它的咪唑鎓对应物[L 1 H] Cl(1)相比,2对水分非常敏感,并且很容易发生开环反应。分离了具有咪唑啉鎓盐的开环产物的钯配合物,并通过X射线晶体学对其进行了表征。理论研究证实,咪唑啉盐比咪唑鎓盐具有更高的开环反应倾向。新的膦/卡宾钯混合复合物,顺式[PdCl 2(L)(PR 3)](L = L 1和L 2; R = Ph,Cy)已成功制备。可变温度NMR光谱研究和热重分析表明,这些配合物具有很高的鲁棒性。在不同的卡宾基团上的新配合物的结构和电子性质(咪唑-2-亚基(不饱和卡宾)与咪唑啉-2-亚基(饱和卡宾))和膦基(PPh 3与PCy 3)为通过X射线晶体学,X射线光电子能谱和理论计算进行了详细研究。催化研究表明,顺式-[PdCl 2(L 2)(PCy 3)]是合格的Pd II 铃木偶联反应的前催化剂,其中不活泼的芳基氯可用作底物。
Synthesis of Biaryls via Decarboxylative Pd-Catalyzed Cross-Coupling Reaction
作者:Jean-Michel Becht、Cédric Catala、Claude Le Drian、Alain Wagner
DOI:10.1021/ol070495y
日期:2007.4.1
and efficient route to biaryls via Pd-catalyzed decarboxylative cross-couplings of arene carboxylic acids and aryl iodides is reported. The PdCl2/AsPh3 catalytic system in the presence of Ag2CO3 in DMSO was found to be particularly efficient to perform this transformation. This reaction can be extended to the synthesis of various biaryls, including sterically hindered biaryls, with yields ranging from
Nickel-Catalyzed Cross-Coupling of Organolithium Reagents with (Hetero)Aryl Electrophiles
作者:Dorus Heijnen、Jean-Baptiste Gualtierotti、Valentín Hornillos、Ben L. Feringa
DOI:10.1002/chem.201505106
日期:2016.3.14
Nickel‐catalyzed selective cross‐coupling of aromatic electrophiles (bromides, chlorides, fluorides and methyl ethers) with organolithium reagents is presented. The use of a commercially available nickel N‐heterocyclic carbene (NHC) complex allows the reaction with a variety of (hetero)aryllithium compounds, including those prepared via metal‐halogen exchange or direct metallation, whereas a commercially
Additive-Free Palladium-Catalyzed Decarboxylative Cross-Coupling of Aryl Chlorides
作者:Ryan A. Daley、En-Chih Liu、Joseph J. Topczewski
DOI:10.1021/acs.orglett.9b01620
日期:2019.6.21
The cross-coupling of sodium (hetero)aryl carboxylates with (hetero)arylchlorides proceeds with 1 mol % palladium catalyst and does not require inorganic base, silver salts, or copper salts. This coupling uses two low energy partners, and the only stoichiometric byproducts are carbon dioxide and sodium chloride. The substrate scope includes less activated arylchlorides and carboxylates (>25 examples)
An Extremely Active Catalyst for the Negishi Cross-Coupling Reaction
作者:Jacqueline E. Milne、Stephen L. Buchwald
DOI:10.1021/ja0474493
日期:2004.10.1
A new catalyst system for the Pd-catalyzed cross-coupling of organozinc reagents with aryl halides (Negishi coupling) has been developed. This system permits efficient preparation of hindered biaryls (tri- and tetra-ortho-substituted), functions effectively at low levels of catalyst, and tolerates a wide range of functional groups and heterocyclic substrates. A systematic study of ligand structure