Efficient Aliphatic C−H Bond Oxidation Catalyzed by Manganese Complexes with Hydrogen Peroxide
作者:Wenfang Wang、Daqian Xu、Qiangsheng Sun、Wei Sun
DOI:10.1002/asia.201800068
日期:2018.9.4
applied successfully in benzylic C−H oxidation, giving the corresponding ketones with very good selectivities. In addition, tertiary C−H bond oxidation of complex molecules by the manganese complex showed potential utility for assembling alcohols with good selectivity in late‐stage chemical synthesis.
开发了含有苯并咪唑环和富电子吡啶环的四齿氮配体,所得锰配合物在简单烷烃的CH氧化中表现出良好的活性。特别地,通过使用环境友好的H 2 O 2作为末端氧化剂,环状脂肪族烷烃以非常高的收率(高达89%)转化为酮。该方案也成功地用于苄基CH氧化中,从而使相应的酮具有很好的选择性。此外,锰络合物对复杂分子的CH-H键氧化显示出在后期化学合成中以良好的选择性组装醇的潜在效用。
Tuning of the Properties of Transition-Metal Bispidine Complexes by Variation of the Basicity of the Aromatic Donor Groups
作者:Peter Comba、Michael Morgen、Hubert Wadepohl
DOI:10.1021/ic4004214
日期:2013.6.3
find broad application in the field of coordination chemistry, and the redox potentials of their transition-metal complexes are of importance in oxidation reactions by high-valent iron complexes, aziridination catalyzed by copper complexes, and imaging by 64Cu positron emission tomography tracers. Here, we show that the redox potentials and stability constants of the copper(II) complexes of 15 tetradentate
联吡啶(3,7-二氮杂双环[3.3.1]壬烷)是非常刚性和高度组织化的配体,在配位化学领域得到广泛应用,它们的过渡金属配合物的氧化还原电势在高氧氧化反应中很重要。价铁络合物,铜络合物催化的叠氮化和64 Cu铜正电子发射断层显像剂成像。在这里,我们显示了15个四齿联吡啶的铜(II)配合物的氧化还原电势和稳定性常数可以通过取代吡啶环来改变(氧化还原电势在约450 mV以上的变化和复合物稳定性在约10 mV以上的变化)日志单位)。还表明,这些变化可以通过p K a预测。吡啶基团的值以及取代基的哈米特参数,以及基于密度泛函理论的能量分解分析,还可以使人们准确地预测氧化还原电势和随之而来的配合物稳定性。结果表明,主要贡献来自于静电相互作用能,因此吡啶供体基团的部分电荷也与氧化还原电势相关。
Sulfanylmethyldimethylaminopyridine as a Useful Thiol Additive for Ligation Chemistry in Peptide/Protein Synthesis
dimethylaminopyridine, 2-sulfanylmethyl-4-dimethylaminopyridine (2), has an acidic thiol group comparable to that in aryl thiols due to the formation of a zwitterion consisting of a thiolate anion and a pyridinium cation. It can be used as an additive for nativechemicalligation. The alkyl thiol in 2 allows it to be used for the one-pot nativechemical ligation–desulfurization protocol in peptide synthesis. The utility
Synthesis and Characterization of the Most Active Copper ATRP Catalyst Based on Tris[(4-dimethylaminopyridyl)methyl]amine
作者:Thomas G. Ribelli、Marco Fantin、Jean-Claude Daran、Kyle F. Augustine、Rinaldo Poli、Krzysztof Matyjaszewski
DOI:10.1021/jacs.7b12180
日期:2018.1.31
The tris[(4-dimethylaminopyridyl)methyl]amine (TPMANMe2) as a ligand for copper-catalyzed atom transfer radical polymerization (ATRP) is reported. In solution, the [CuI(TPMANMe2)Br] complex shows fluxionality by variable-temperature NMR, indicating rapid ligand exchange. In the solid state, the [CuII(TPMANMe2)Br][Br] complex exhibits a slightly distorted trigonal bipyramidal geometry (τ = 0.89). The
Resonance Raman Investigation of Equatorial Ligand Donor Effects on the Cu<sub>2</sub>O<sub>2</sub><sup>2+</sup> Core in End-On and Side-On μ-Peroxo-Dicopper(II) and Bis-μ-oxo-Dicopper(III) Complexes
作者:Mark J. Henson、Michael A. Vance、Christiana Xin Zhang、Hong-Chang Liang、Kenneth D. Karlin、Edward I. Solomon
DOI:10.1021/ja0276366
日期:2003.4.1
in the bis-mu-oxo-dicopper(III) isomer relative to side-on peroxo-dicopper(II) species is observed for R-MePY2 with R = H < MeO < Me(2)N. This effect is attributed to the thermodynamic stabilization of the bis-mu-oxo-dicopper(III) isomer relative to the side-on peroxo-dicopper(II) isomer by strong donor ligands. Thus, the side-on peroxo-dicopper(II)/bis-mu-oxo-dicopper(III) equilibrium can be controlled