Integrated Electrochemical–Chemical Oxidation Mediated by Alkoxysulfonium Ions
作者:Yosuke Ashikari、Toshiki Nokami、Jun-ichi Yoshida
DOI:10.1021/ja202880n
日期:2011.8.10
electrochemical-chemical oxidation can be applied to the oxidation of diarylmethanes to diaryl ketones, toluenes to benzaldehydes, and aryl-substituted alkenes to 1,2-diketones. Moreover, the oxidation of unsaturated compounds bearing a nucleophilic group in an appropriate position gives cyclized carbonyl compounds.
Integration of electrooxidative cyclization and chemical oxidation via alkoxysulfonium ions. Synthesis of exocyclic ketones from alkenes with cyclization
作者:Yosuke Ashikari、Toshiki Nokami、Jun-ichi Yoshida
DOI:10.1039/c3ob40315g
日期:——
An integration of electrooxidative cyclization and chemical oxidation was achieved. Electrochemical oxidation of alkenes having a nucleophilic moiety in the presence of DMSO gave cyclized alkoxysulfonium ions, which were converted to the corresponding ketones by treatment with triethylamine in a one-pot sequential manner. The method is also an effective tool for cyclization of 1,6-dienes affording five-membered ring diketones in high stereoselectivity.
Arene Trifunctionalization with Highly Fused Ring Systems through a Domino Aryne Nucleophilic and Diels–Alder Cascade
作者:Jia He、Zizi Jia、Hongcheng Tan、Xiaohua Luo、Dachuan Qiu、Jiarong Shi、Hai Xu、Yang Li
DOI:10.1002/anie.201911730
日期:2019.12.16
A convenient and efficient domino aryne process was developed under transition-metal-free conditions to generate a range of tetra- and pentacyclic ring systems. This transformation was realized via a 1,2-benzdiyne through a nucleophilic and Diels-Alder reaction cascade using styrene as the diene moiety. Three new chemical bonds, namely one C-N and two C-C bonds, and two benzofused rings could be constructed
Direct C–N Coupling of Imidazoles with Aromatic and Benzylic Compounds via Electrooxidative C–H Functionalization
作者:Tatsuya Morofuji、Akihiro Shimizu、Jun-ichi Yoshida
DOI:10.1021/ja501093m
日期:2014.3.26
A method for the C-N coupling of imidazoles based on electrooxidative C-H functionalization of aromatic and benzylic compounds has been developed. The key to the success is the formation of protected imidazolium ions as initial products, avoiding overoxidation. Deprotection under nonoxidative conditions affords N-substituted imidazoles. Various functional groups are compatible with the present transformation