An economical and environmentally friendly oxidative biaryl coupling promoted by activated MnO<sub>2</sub>
作者:Jingjing Yang、Shutao Sun、Ziyu Zeng、Hongbo Zheng、Wei Li、Hongxiang Lou、Lei Liu
DOI:10.1039/c4ob01409j
日期:——
An activated manganese dioxide (MnO2)–BF3·OEt2 oxidation system was developed to efficiently mediate the intramolecular as well as intermolecular biaryl coupling. The oxidative coupling proceeds smoothly at ambient temperature to deliver the corresponding five- to eight-membered tricyclic products in good to excellent yields. The employment of the combination of MnO2 and BF3·OEt2 is attractive on the basis of economical and environmental issues.
Seven- and eight-membered heterocyclic biaryl synthesis through a metal-free oxidative coupling reaction
作者:Shutao Sun、Jingjing Yang、Fanmei Li、Zheng Lv、Wei Li、Hongxiang Lou、Lei Liu
DOI:10.1016/j.tetlet.2014.10.103
日期:2014.12
A metal-free intramolecular biaryl coupling mediated by DDQ and BF3 center dot OEt2 was developed. The reaction proceeds smoothly at room temperature to give seven- and eight-membered heterocyclic biaryl compounds in up to 95% yields. Only 1 equiv of DDQ sufficed for the reaction, obviating the use of a large excess of oxidants and undesired chlorination pathway in metal-mediated process. (C) 2014 Elsevier Ltd. All rights reserved.
Highly Selective Formation of Eight-Membered-Ring Systems by Oxidative Cyclization with Molybdenum PentachlorideâAn Environmentally Friendly and Inexpensive Access to 2,2â²-Cyclolignans The work was supported by the Deutschen Forschungsgemeinschaft and H. C. Starck (Goslar, Germany) by a donation of MoCl5. We particularly thank Prof. Dr. Dieter Hoppe for fruitful discussions and support in this project.
作者:Beate Kramer、Anne Averhoff、Siegfried R. Waldvogel
Electrosynthesis of medium and large sized rings by oxidative cyclization of bis(3,4-dimethoxyphenyl)alkanes
作者:Alvin Ronlan、Vernon D. Parker
DOI:10.1021/jo00921a037
日期:1974.4
Active Molybdenum-Based Anode for Dehydrogenative Coupling Reactions
作者:Sebastian B. Beil、Timo Müller、Sydney B. Sillart、Peter Franzmann、Alexander Bomm、Michael Holtkamp、Uwe Karst、Wolfgang Schade、Siegfried R. Waldvogel
DOI:10.1002/anie.201712718
日期:2018.2.23
and powerful active anode system that can be operated in 1,1,1,3,3,3‐hexafluoro‐2‐propanol (HFIP) has been discovered. In HFIP the molybdenum anode forms a compact, conductive, and electroactive layer of higher‐valent molybdenum species. This system can replace powerful but stoichiometrically required MoV reagents for the dehydrogenative coupling of aryls. This electrolytic reaction is more sustainable