Bis(pyrazolyl)methane ligands are excellent components of model complexes used to investigate the activity of the enzyme tyrosinase. Combining the N donors 3‐tert‐butylpyrazole and 1‐methylimidazole results in a ligand that is capable of stabilising a (μ‐η2:η2)‐dicopper(II) core that resembles the active centre of tyrosinase. UV/Vis spectroscopy shows blueshifted UV bands in comparison to other known
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。
Selective Removal of Aminoquinoline Auxiliary by IBX Oxidation
8-Aminoquinoline (AQ) is a widely used bidentate auxiliary in metal-catalyzed directed C-H functionalization reactions. Herein, we report an efficient and chemoselective method to convert various N-quinolyl carboxamides to primary amides with the treatment of a stoichiometric amount of 2-iodoxybenzoic acid oxidant or the combination of a catalytic amount of 2-iodobenzoic acid and Oxone co-oxidant in
[EN] IN SILICO IDENTIFICATION OF CANCER MOLECULAR SIGNALING PATHWAYS AND DRUG CANDIDATES<br/>[FR] IDENTIFICATION IN SILICO DE VOIES DE SIGNALISATION MOLÉCULAIRES LIÉES AU CANCER ET MÉDICAMENTS CANDIDATS
申请人:H LEE MOFFITT CANCER CT & RES
公开号:WO2014071316A1
公开(公告)日:2014-05-08
Disclosed is an in silico method to identify molecular signaling pathways that influence cancer development as well as therapeutic compounds with activity against them.
Record Broken: A Copper Peroxide Complex with Enhanced Stability and Faster Hydroxylation Catalysis
bis(pyrazolyl)methanes with pyridinyl or imidazolyl moieties are already reported as excellent tyrosinase models. Substitution of the pyridinyl donor results in the new ligand HC(3-tBuPz)2(4-CO2MePy) which stabilises a room-temperature stable μ-η2:η2-peroxide dicopper(II) species upon oxygenation. It reveals highly efficient catalytic activity as it hydroxylates 8-hydroxyquinoline in high yields (TONs of