imine-based nonheme iron(II) complexes (LX)2Fe(OTf)2 has been prepared, characterized, and employed as C–H oxidationcatalysts. Ligands LX (X = 1, 2, 3, and 4) stand for tridentate imine ligands resulting from spontaneous condensation of 2-pycolyl-amine and 4-substituted-2-picolyl aldehydes. Fast and quantitative formation of the complex occurs just upon mixing aldehyde, amine, and Fe(OTf)2 in a 2:2:1
制备,表征了一系列基于亚胺的非血红素铁(II)配合物(LX)2 Fe(OTf)2,并用作CH氧化催化剂。配体LX(X = 1,2,3,和4)静置由2- pycolyl胺和4-取代的-2-吡啶甲基醛自发缩合得到的三齿配体的亚胺。仅在乙腈溶液中以2:2:1的比例混合醛,胺和Fe(OTf)2时,即可快速,定量地形成络合物。(L1)2 Fe(OTf)(ClO 4)和(L 3)2 Fe(OTf)2被报道,显示出低旋转的八面体铁中心,其配体以子午线的方式排列。1 H NMR分析表明固态结构和自旋态保留在溶液中。这些分析还表明存在胺-亚胺互变异构平衡。(LX)2 Fe(OTf)2利用H 2 O 2有效催化烷基C–H键的氧化作为末端氧化剂。亚胺配体的电子性质的控制对氧化过程的效率和选择性只有很小的影响。进行了一项机理研究,提供了C–H氧化是基于金属的证据。反应在羟基碳上以立体保留的方式发生,并在叔碳氢键上
Manganese/cobalt-catalyzed oxidative C(sp<sup>3</sup>)–H/C(sp<sup>3</sup>)–H coupling: a route to α-tertiary β-arylethylamines
作者:Meiling Tan、Kaizhi Li、Jiangliang Yin、Jingsong You
DOI:10.1039/c7cc08512e
日期:——
An oxidative coupling reaction of an α-C(sp3)–H bond of amine with a benzylic C(sp3)–H bond provides diverse collections of α-tertiary β-arylethylamines.
A comparative study of amide-bond forming reagents in aqueous media – Substrate scope and reagent compatibility
作者:Matthew Badland、Robert Crook、Bastien Delayre、Steven J. Fussell、Iain Gladwell、Michael Hawksworth、Roger M. Howard、Robert Walton、Gerald A. Weisenburger
DOI:10.1016/j.tetlet.2017.10.014
日期:2017.11
A survey of amidation reagents demonstrating DIC-HOPO, DMT-MM, COMU-collidine, TPTU-NMI, EEDQ, CDI and EDC-Oxyma to be effective for the coupling of carboxylic acids with amines in the presence of water and the absence of problematic dipolar aprotic solvents is reported. DMT-MM was shown to provide the best yields for the coupling of a secondary amine, TPTU-NMI and COMU-collidine for aniline, whilst
Metal-Free C–C Coupling of an Allenyl Sulfone with Picolyl Amides to Access Vinyl Sulfones via Pyridine-Initiated In Situ Generation of Sulfinate Anion
作者:Humair M. Omer、Peng Liu、Kay M. Brummond
DOI:10.1021/acs.joc.0c00788
日期:2020.6.19
Vinyl sulfones are privileged motifs known for their biological activity and synthetic utility. Synthetic transformations to efficiently access high-value compounds with these motifs are desired and sought after. Herein, a new procedure is described to form vinyl sulfone-containing compounds by selective functionalization of the C(sp3)–H bond adjacent to the pyridine ring of pharmacologically prevalent
Platinum(II) Complexes of Tridentate ‐Coordinating Ligands Based on Imides, Amides, and Hydrazides: Synthesis and Luminescence Properties
作者:Emma V. Puttock、Jiri Sturala、Jos C. M. Kistemaker、J. A. Gareth Williams
DOI:10.1002/ejic.202000879
日期:2021.1.26
Five Pt(II) complexes are described in which the metal ion is bound to anionic ‐coordinating ligands. The central, deprotonated N atom is derived from an imide Ar−C(=O)−NH−C(=O)−Ar PtL1–2Cl; Ar=pyridine or pyrimidine}, an amide py−C(=O)−NH−CH2−py PtL3Cl}, or a hydrazide py−C(=O)−NH−N=CH−py PtL4Cl}. The imide complexes PtL1–2Cl show no significant emission in solution but are modestly bright green/yellow