Remote and Selective C(sp2)–H Olefination for Sequential Regioselective Linkage of Phenanthrenes
摘要:
Biphenylcarboxylic acid with two competing C(sp(2))-H sites was designed for site selective C(sp(2))-H functionalization by developing carboxylic acids assisted remote and selective olefination via 7-membered palladacycle. Mechanism investigation and DFT calculations reveal a kinetics-determined process, which could be utilized to explore a variety of remote site selectivity. The practicability of this method was highlighted by the precise construction of phenathrene under sequential site selectivity.
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。
Ruthenium(<scp>ii</scp>)-catalyzed C–H functionalizations on benzoic acids with aryl, alkenyl and alkynyl halides by weak-O-coordination
作者:Ruhuai Mei、Cuiju Zhu、Lutz Ackermann
DOI:10.1039/c6cc07773k
日期:——
C-H arylations of weakly coordinating benzoic acids were achieved by versatile ruthenium(II) catalysis with ample substrate scope. Thus, user-friendly ruthenium(II) biscarboxylate complexes modified with tricyclohexylphosphine enabled C-H functionalizations with aryl...
A Versatile Approach for the Synthesis of para-Substituted Arenes via Palladium-Catalyzed C–H Functionalization and Protodecarboxylation of Benzoic Acids
作者:Yanghui Zhang、Shulei Pan、Bo Zhou、Changdong Shao、Guangfa Shi
DOI:10.1055/s-0035-1560579
日期:——
functionalization reactions have been developed and several breakthroughs have been achieved in meta C–H activation, para C–H functionalization is still in its infancy stage. In this article, a versatile strategy for the synthesis of para-substituted arenes has been developed via a tandem process consisting of palladium-catalyzed C–H functionalization and subsequent copper-catalyzed protodecarboxylation
Cobalt-Catalyzed C−H Functionalizations by Imidate Assistance with Aryl and Alkyl Chlorides
作者:Ruhuai Mei、Lutz Ackermann
DOI:10.1002/adsc.201600384
日期:2016.7.28
inexpensive cobalt(II) acetylacetonate [Co(acac)2] and an N‐heterocyclic carbene (NHC) ligand enabled versatile C−H arylations by oxazoline assistance. The broadly applicable, low‐valent cobalt catalyst displayed a wide substrate scope, and even proved applicable to challenging C−H alkylations with β‐hydrogen‐containing primary and secondary alkyl chlorides. The power of the cobalt‐catalyzed C−H arylation
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-