Iridium-Catalyzed<i>ortho</i>-Arylation of Benzoic Acids with Arenediazonium Salts
作者:Liangbin Huang、Dagmar Hackenberger、Lukas J. Gooßen
DOI:10.1002/anie.201505769
日期:2015.10.19
In the presence of catalytic [IrCp*Cl2}2] and Ag2CO3, Li2CO3 as the base, and acetone as the solvent, benzoic acids react with arenediazonium salts to give the corresponding diaryl‐2‐carboxylates under mild conditions. This CH arylation process is generally applicable to diversely substituted substrates, ranging from extremely electron‐rich to electron‐poor derivatives. The carboxylate directing
在催化[IrCp * Cl 2 } 2 ]和Ag 2 CO 3,Li 2 CO 3为碱,丙酮为溶剂的情况下,苯甲酸与槟榔重氮盐反应生成相应的二芳基-2-羧酸盐温和的条件。这种CH芳基化过程通常适用于各种取代的底物,范围从极富电子的至贫电子的衍生物。羧酸根导向基团是广泛可得的,可以无痕地除去或用于进一步的衍生作用。通过使用重氮盐可实现与卤化物交叉偶联的正交性,即使存在碘取代基也可将其偶联。
Palladium(II) Chloride Complexes of N,N′-Disubstituted Imidazole-2-thiones: Syntheses, Structures, and Catalytic Performances in Suzuki–Miyaura and Sonogashira Coupling Reactions
作者:Li-Ming Zhang、Hai-Yan Li、Hong-Xi Li、David James Young、Yong Wang、Jian-Ping Lang
DOI:10.1021/acs.inorgchem.7b01616
日期:2017.9.18
Reactions of PdCl2 with 2 equiv of N,N′-disubstituted-imidazole-2-thiones R1R2C3N2S (R1 = R2 = Me (1a), iPr (1b), Cy (1c), C6Me3H2 (1d); R1 = Me, R2 = Ph (1e)) under the different conditions afford five mononuclear complexes trans-[(R1R2C3N2S)2PdCl2] (R1 = R2 = Me (2a), iPr (2b), Cy (2c), C6Me3H2 (2d); R1 = Me, R2 = Ph (2e)) and five binuclear Pd(II) complexes [(PdCl2)μ-(R1R2C3N2S)}]2 (R1 = R2 = Me
PdCl 2与2当量的N,N'-二取代-咪唑-2-硫酮R 1 R 2 C 3 N 2 S(R 1 = R 2 = Me(1a),i Pr(1b),Cy(1c),C 6 Me 3 H 2(1d); R 1 = Me,R 2 = Ph(1e))在不同条件下可得到5个单核配合物反式-[(R 1 R 2 C 3 N 2 S)2 PdCl 2 ](R 1 = R 2 = Me(2a),i Pr(2b),Cy(2c),C 6 Me 3 H 2(2d); R 1 = Me,R 2 = Ph(2e))和五个双核Pd(II)络合物[(PdCl 2)μ-(R 1 R 2 C 3 N 2 S)}] 2(R 1 = R 2 = Me(3a),i Pr(3b),Cy(3c),C 6 Me 3 H 2(3d); R 1 = Me,R 2 = Ph(3e))。通过在回流的MeOH中添加等摩尔的PdCl 2,可以轻松将络合物2a
Palladium Catalysed Cross-Coupling of Aryl Bromides with Functionalised Arylboronic Acids in the Presence of a Tetraphosphine Ligand
cyclopentane/[PdCl(C3H5)]2 system catalyses efficiently the cross-coupling of aryl bromides with functionalised arylboronicacids. The electronic properties of the arylboronicacids seem to have a minor influence on the reaction rate. Better results were generally obtained for the reaction of electron poor aryl bromides associated with electron rich arylboronicacids rather than the contrary.
more economically attractive but usually much more difficult as substrates in metal-mediated couplings than the corresponding bromides and iodides. A catalyst prepared from a bulky (biaryl)diphenyl phosphane and a common ruthenium source (1:1) mediates selective direct monoarylations of arenes bearing 2-pyridyl and related ortho-directing groups in good yields. Sequential arylations to heterodiarylated