Copper−Hydroperoxo-Mediated N-Debenzylation Chemistry Mimicking Aspects of Copper Monooxygenases
作者:Debabrata Maiti、Amy A. Narducci Sarjeant、Kenneth D. Karlin
DOI:10.1021/ic800617m
日期:2008.10.6
oxidative N-debenzylation reaction along with PhCHO formation occurs from a hydroperoxo-copper(II) complex that has a dibenzylamino substrate (N(CH 2Ph) 2 appended as a substituent on one pyridyl group of its tripodal tetradentate TMPA (also TPA, (2-pyridylmethyl)amine)) ligand framework. During the course of the (L (N(CH 2 ) (Ph) 2 ))Cu (II)( (-)OOH) reactivity, the formation of a substrate and a (-)OOH-derived
氢过氧铜 (II) 复合物具有二苄基氨基底物(N(CH 2Ph) 2 作为取代基附加在其三足四齿 TMPA(也为 TPA, (2-吡啶基甲基)胺))配体框架。在 (L (N(CH 2 ) (Ph) 2 ))Cu (II)( (-)OOH) 反应过程中,形成底物和 (-)OOH 衍生的(氧原子)烷氧基Cu (II)( (-)OR) 络合物出现。观察到相同的 Cu (II)( (-)OR) 物质来自 Cu (Iota)/PhIO 化学,这表明在烷氧基物质形成过程中形成铜-氧(铜基)反应性中间体的可能性;新的 ESI-MS 数据为这种高价中间体提供了进一步的支持。基于此处提供的动力学同位素效应研究和先前发表的对结合二甲胺 (N(CH 3) 2) 的密切相关的 Cu (II)( (-)OOH) 物种的研究,提出了净 H 原子提取化学内部基板;具有类似同位素效应结果的 Cu (Iota)/PhIO
Amine Oxidative N-Dealkylation via Cupric Hydroperoxide Cu-OOH Homolytic Cleavage Followed by Site-Specific Fenton Chemistry
作者:Sunghee Kim、Jake W. Ginsbach、Jung Yoon Lee、Ryan L. Peterson、Jeffrey J. Liu、Maxime A. Siegler、Amy A. Sarjeant、Edward I. Solomon、Kenneth D. Karlin
DOI:10.1021/ja508371q
日期:2015.3.4
the mechanism of this process, reactionkinetics and products were determined employing ligand substrates with various para-substituent dibenzyl pairs (-H,-H; -H,-Cl; -H,-OMe, and -Cl,-OMe), or with partially or fully deuterated dibenzyl N-(CH2Ph)2 moieties. A series of ligand-copper(II) bis-perchlorate complexes were synthesized, characterized, and the X-ray structures of the -H,-OMe analogue were
氢过氧化铜 (II) 是燃料电池和(生物)化学氧化等过程中的重要中间体,所有过程都涉及分子氧的逐步还原。我们之前报道了一种 Cu(II)-OOH 物质,它对附加在三足四齿配体吡啶基供体 6 位上的二苄氨基进行氧化 N-脱烷基化。为了深入了解该过程的机理,使用具有各种对位取代基二苄基对(-H,-H;-H,-Cl;-H,-OMe 和 -Cl,-)的配体底物测定了反应动力学和产物。 OMe),或具有部分或完全氘代的二苄基 N-(CH2Ph)2 部分。合成、表征了一系列配体-双高氯酸铜(II)配合物,并确定了-H,-OMe类似物的X射线结构。相应的亚稳态 Cu(II)-OOH 物质是通过在 -90 °C 的丙酮中添加 H2O2/碱生成的。这些转化(t1/2 ≈ 53 s)为氧化 N-脱烷基产物,产生对位取代的苯甲醛。基于实验观察和支持 DFT 计算,可以排除涉及二苄胺 H 原子抽象或 Cu(II)-OOH
Copper Dioxygen Adducts: Formation of Bis(μ-oxo)dicopper(III) versus (μ-1,2)Peroxodicopper(II) Complexes with Small Changes in One Pyridyl-Ligand Substituent
作者:Debabrata Maiti、Julia S. Woertink、Amy A. Narducci Sarjeant、Edward I. Solomon、Kenneth D. Karlin
DOI:10.1021/ic702437c
日期:2008.5.1
7- (1) (8)O 2 reactivity, and a H-atom abstraction by 7-O 2 is apparent from study of its reactions with ArOH substrates, as well as the determination of k H/ k D approximately 7 in the toluene oxygenation (i.e., PhCH 3 vs PhCD 3 substrates). Proposed courses of reaction are presented, including the possible involvement of PhCH 2OO (*) and its subsequent reaction with copper(I) complex, the latter derived
由(配体)-Cu(I)/ O 2反应性形成特定Cu 2O 2异构体的偏好可以通过具有6-三脚架四齿配体的三个供体基团之一上的吡啶基取代基。当该取代基为-XHR基团(X = N或C)时,传统的Cu(I)/ O 2加合物形成(mu-1,2)过二铜(II)物种(A)。然而,当取代基是稍大的XR 2部分芳基或NR 2(R不等于H)}时,优选双(μ-氧代)二铜(III)结构(C)。双(μ-氧代)双金属(III)物种之一[[(6tbp)Cu(III)} 2(O(2-))2](2+)(7-O 2)(6tbp =(6-(t)Bu-苯基-2-吡啶基甲基)双(2-吡啶基甲基)胺,这是第一次,观察到外源甲苯或乙苯烃的氧合反应。发生了典型的单加氧酶化学反应:苯甲醛产物包括一个18-O原子,用于甲苯/ 7-(1)(8)O 2反应,并且通过研究其与ArOH底物的反应可以明显看出H-原子被7-O 2提取。 ,以及在甲苯氧化中测定k