A mild approach for a Cp*Co(III)‐catalyzed C−H naphthylation of arenes by 7‐oxabicyclicalkenes has been developed. In some cases, intermediate products with a 1,2‐dihydronaphthalen‐1‐ol group have been isolated at room temperature in good yield. The catalytic reaction proceeds via C−H activation, insertion, β‐oxygen elimination, protonation, and dehydration, respectively. These simple protocols, featuring
Mn‐Catalyzed Dehydrocyanative Transannulation of Heteroarenes and Propargyl Carbonates through C−H Activation: Beyond the Permanent Directing Effects of Pyridines/Pyrimidines
作者:Guangfan Zheng、Jiaqiong Sun、Youwei Xu、Shuailei Zhai、Xingwei Li
DOI:10.1002/anie.201900166
日期:2019.4
Pyridines/pyrimidines are common and effective directing groups in C−Hactivation. However, they are poorly functionalizable heteroarenes. Reported in this work is Mn‐catalyzeddehydrocyanativetransannulation between three classes of heteroarenes and propargylcarbonates. The pyridyl/pyrimidyl groups in the heteroarenes initially function as directing groups to enable C−H allenylation; they then undergo
Mild and Efficient C2-Alkenylation of Indoles with Alkynes Catalyzed by a Cobalt Complex
作者:Zhenhua Ding、Naohiko Yoshikai
DOI:10.1002/anie.201200019
日期:2012.5.7
Direct alkenylation of the C2‐position of indoles bearing an easily removable N‐pyrimidyl group with alkynes has been achieved by using a cobalt catalyst complexed with a phosphine–pyridine bidentate ligand. This reaction has wide substrate scope and is highly efficient and stereoselective at room temperature. The alkenylated indoles serve as useful platforms for further synthetic transformations (some
Rh(III)-Catalyzed Acceptorless Dehydrogenative Coupling of (Hetero)arenes with 2-Carboxyl Allylic Alcohols
作者:Jintao Xia、Zhipeng Huang、Xukai Zhou、Xifa Yang、Feng Wang、Xingwei Li
DOI:10.1021/acs.orglett.7b03881
日期:2018.2.2
Rhodium(III)-catalyzed C–H activation of (hetero)arenes and redox-neutral coupling with 2-carboxyl allylic alcohols has been realized for the construction of β-aryl ketones. This reaction occurred efficiently at a relatively low catalyst loading via initialdehydrogenative alkylation to give a β-keto carboxylic acid, followed by decarboxylation.
Rhodium-catalyzed coupling of arenes and fluorinated α-diazo diketones: synthesis of chromones
作者:Jiayi Yao、Lingheng Kong、Xingwei Li
DOI:10.1039/d0cc05664b
日期:——
has been realized for the facile synthesis of 3-arylchromones. The reaction proceeds via chelation-assisted C–H activation, carbene insertion, and uncatalyzed intramolecular nucleophilic aromatic substitution, with C–F cleavage being accommodated in the nucleophilic aromatic substitution step. Three classes of heteroarenes have been defined with decent functional group tolerance.