Ruthenium-Catalyzed C−H Arylation of Benzoic Acids and Indole Carboxylic Acids with Aryl Halides
作者:Marco Simonetti、Diego M. Cannas、Adyasha Panigrahi、Szymon Kujawa、Michal Kryjewski、Pan Xie、Igor Larrosa
DOI:10.1002/chem.201605068
日期:2017.1.12
Ru-catalyzed C-H arylation of benzoic acids with readily available aryl (pseudo)halides. The reaction, which does not require the use of silver salt additives, allows the arylation of previously challenging hindered benzoic acids and the use of generally unreactive ortho-substituted halorarenes. Furthermore, our new protocol can efficiently be applied to indolecarboxylicacids, thus allowing access to C7-
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。
Rhodium‐Catalyzed
<i>ortho</i>
‐Arylation of (Hetero)aromatic Acids
作者:Philip Weber、Christian K. Rank、Enis Yalcinkaya、Marco Dyga、Tim van Lingen、Rochus Schmid、Frederic W. Patureau、Lukas J. Gooßen
DOI:10.1002/adsc.201900596
日期:2019.9.3
Rhodium acetate effectively promotes the carboxylate‐directed ortho‐arylation of (hetero)aromatic carboxylates with aryl bromides. The main advantage of this phosphine‐free, redox‐neutral method arises from its efficiency in assembling biologically meaningful electron‐rich arylpyridines, which are problematic substrates in known C−H arylations using Pd, Ru, and Ir catalysts.