Regioselective Oxidation of Phenols to o-Quinones with o-Iodoxybenzoic Acid (IBX)
摘要:
GRAPHICSAn efficient regioselective method for oxidation of phenols to o-quinones is reported. When this procedure is combined with a subsequent reduction, it proves to be useful for the construction of a variety of catechols.
A Catalyst-Controlled Aerobic Coupling of<i>ortho</i>-Quinones and Phenols Applied to the Synthesis of Aryl Ethers
作者:Zheng Huang、Jean-Philip Lumb
DOI:10.1002/anie.201606359
日期:2016.9.12
ortho‐Quinones are underutilized six‐carbon‐atom building blocks. We herein describe an approach for controlling their reactivity with copper that gives rise to a catalytic aerobic cross‐coupling with phenols. The resulting aryl ethers are generated in high yield across a broad substrate scope under mild conditions. This method represents a unique example where the covalent modification of an ortho‐quinone
Three new mononuclearcopper(I) complexes supported by the symmetric ligands 1,1′-methylenebis-1H-pyrazole (BPM), 1,1′-methylenebis(3-methyl-1H-pyrazole) (mBPM), and 1,1′-methylenebis(3,5-di-methyl-1H-pyrazole) (dmBPM) were synthesized as catalyticmodelsystems of tyrosinase. The influence of various functional groups on the catalytic conversion of monophenols is investigated and the formation of
Associative chemosensing by fluorescent macrocycle–dye complexes – a versatile enzyme assay platform beyond indicator displacement
作者:Frank Biedermann、Denisa Hathazi、Werner M. Nau
DOI:10.1039/c4cc10227d
日期:——
Enzymatic reactions of aromatic substrates can be monitored by fluorescence with μM sensitivity in real time by using self-assembled fluorescent receptors.
芳香底物的酶反应可以通过使用自组装荧光受体实时监测,具有微米级灵敏度的荧光。
Catalytic Phenol Hydroxylation with Dioxygen: Extension of the Tyrosinase Mechanism beyond the Protein Matrix
作者:Alexander Hoffmann、Cooper Citek、Stephan Binder、Arne Goos、Michael Rübhausen、Oliver Troeppner、Ivana Ivanović-Burmazović、Erik C. Wasinger、T. Daniel P. Stack、Sonja Herres-Pawlis
DOI:10.1002/anie.201301249
日期:2013.5.10
structure) hydroxylates phenols with O2 via a stable side‐on peroxide complex, which is similar to the active site of tyrosinase in terms of the ligand environment and its spectroscopic properties. The catalytic oxidation of phenols to quinones proceeds at room temperature in the presence of NEt3 and even non‐native substrates can be oxidized catalytically. The reaction mechanism is analogous to that
一种新的催化剂(见结构)通过稳定的侧向过氧化物络合物将酚与 O 2羟基化,在配体环境及其光谱特性方面类似于酪氨酸酶的活性位点。在室温下,在 NEt 3存在下,苯酚催化氧化为醌,甚至非天然底物也可以催化氧化。反应机理类似于酶催化反应。
Studies of the competing rates of catechol oxidation and suicide inactivation of tyrosinase
作者:Christopher A. Ramsden、Patrick A. Riley
DOI:10.3998/ark.5550190.0011.a20
日期:——
Tyrosinaseoxidation of catechols to ortho-quinones is accompanied by suicide inactivation of the enzyme. The rates of these competing processes vary and depend on the nature of ring substituents. For a series of 4-substituted catechols the relationships between structure and reaction rates have been examined using multiple regression. Significant but different structurerate relationships were found