A range of phenanthrene derivatives were efficiently synthesized by the palladium-catalyzed annulation of 2,2′-diiodobiphenyls with alkynes. The scope, limitations and regioselectivity of the reaction were investigated. The described method was adopted to synthesize 9,10-dialkylphenanthrenes, sterically overcrowded 4,5-disubstituted phenanthrenes and phenanthrene-based alkaloids. Reactions of highly
Deeper in the blue: A versatile procedure has been developed for the preparation of photoluminescent siloles and germoles by palladium‐catalyzed cross‐coupling of 2,2′‐diiodobiaryls with dihydrosilanes and ‐germanes. The dibenzosiloles and ‐germoles with ester moieties on the aromatic ring exhibited different emission wavelengths in the solution and crystalline states, attributable to the intermolecular
Biphenylenes. Part XIV. Synthesis of 1- and 2-phenyl-, 2,7-dimethyl-, and 2,3,6,7-tetramethyl-biphenylene
作者:P. R. Constantine、G. E. Hall、Charles R. Harrison、J. F. W. McOmie、R. J. G. Searle
DOI:10.1039/j39660001767
日期:——
1- and 2-Phenylbiphenylene have been made from 1- and 2-lithiobiphenylene, respectively, by treatment with cyclohexanone followed by dehydration and dehydrogenation. 2-Phenylbiphenylene has also been made by pyrolysis of 4- and 5-phenyl-biphenylene-2,2′-iodonium iodide with cuprous oxide.
<scp>Nickel‐Catalyzed</scp>
Electroreductive Syntheses of Triphenylenes Using
<scp>
<i>ortho</i>
‐Dihalobenzene‐Derived
</scp>
Benzynes
作者:Zhao‐Ming Li、Bin Shuai、Cong Ma、Ping Fang、Tian‐Sheng Mei
DOI:10.1002/cjoc.202200245
日期:2022.10
Electrochemical nickel-catalyzed syntheses of triphenylenes by a) reductive trimerization of ortho-dibromobenzenes or ortho-bromoarylsulfurofluoridates, or b) reductive cross-coupling of ortho-dibromobenzenes to 2,2’-diiodobiphenyls, are described. The former provides a practical means for the construction of triphenylene derivatives in up to 87% isolated yield at room temperature. For 1,2-dihalo-3-methylbenzenes
Copper-catalyzed synthesis of five-membered heterocycles via double C–N bond formation: an efficient synthesis of pyrroles, dihydropyrroles, and carbazoles
作者:Ende Li、Xiaobing Xu、Hongfeng Li、Huimin Zhang、Xiaolei Xu、Xiyuan Yuan、Yanzhong Li
DOI:10.1016/j.tet.2009.08.075
日期:2009.10
An efficient copper-catalyzed double C-N bond forming reaction using diiodides and nitrogen-centered nucleophiles including amides and carbamates is reported. The reactions proceed to afford di- or tri-substituted N-acylpyrroles, dihydropyrroles, and carbazoles in good to excellent yields when different such as 1,4-diiodo-1,3-butadienes, 1,4-dihalobut-1-enes, and 2,2'-diiodobiphenyls were employed, respectively. It is crucial to use CuI as the catalyst with the assistance of proper base and diamine ligand. (C) 2009 Elsevier Ltd. All rights reserved.