Autoxidation of phenols catalyzed by copper(II)-ethylenediamine complexes: the reaction mechanism
作者:Keiko Kushioka
DOI:10.1021/jo00197a024
日期:1984.11
Catalytic activity of copper(II)-ethylenediamine complexes in autoxidation of phenols
作者:Keiko Kushioka
DOI:10.1021/jo00173a033
日期:1983.12
Cu(II)-mediated phenol oxygenation: Chemical evidence implicates a unique role of the enzyme active site in promoting the chemically difficult tyrosine monooxygenation in TPQ cofactor biogenesis of copper amine oxidases
作者:Zhengjiang Fu、Feng Xu、Hu Cai
DOI:10.1016/j.bioorg.2015.01.004
日期:2015.4
Cu(II)-mediated autoxidations of 4-tert-butylphenol under various conditions was studied, the data confirmed imidazole is the best ligand to promote phenol oxygenation. The same reaction of 2,4-di-tert-butylphenol proceeded much more quickly to lead nearly exclusively to oxidative coupling rather than oxygenation under high pressure O-2. These results suggested that Cu(II)-catalyzed phenol autoxidation by activating O-2 and phenol in terms of a phenoxy radical (ArO center dot)-Cu(II)-superoxide ternary complex, whereas selectivity between oxygenation and coupling depends mainly on the electronic structure of ArO center dot. It is appeared that CuAOs could achieve stoichiometric tyrosine monooxygenation by modulating the redox potential of Cu(II) and stabilizing the ternary complex through protein conformational adjustment. (C) 2015 Elsevier Inc. All rights reserved.