Solvolysis-decomposition ofN-1-adamantyl-N-p-tolylcarbamoyl chloride in hydroxylic solvents
摘要:
In hydroxylic solvents, N-1-adamantyl-N-p-tolylcarbamoyl chloride undergoes a facile rate-determing ionization with very little assistance from nucleophilic solvation (very low sensitivity to changes in solvent nucleophillcity). In the relatively nucleophilic aqueous ethanol or aqueous acetone, the cation formed reacts directly with the solvent. In fluoroalcohols, the low nucleophilicity of the solvent allows an effective competition from a pathway involving disproportionation to the 1-adamantyl cation and p-tolyl isocyanate, followed by reaction of the new cation either with solvent or with the chloride ion formed in the initial ionization, Grunwald-Winstein plots against Y-Cl values show for different binary solvent systems a marked dispersion, which can be considerably reduced by incorporation into the analyses of a term governed by the aromatic ring parameter. (I). (C) 1997 by John Wiley & Sons, Ltd.
Room-Temperature CuI-Catalyzed Amination of Aryl Iodides and Aryl Bromides
作者:Xiaomei Ding、Manna Huang、Zhou Yi、Dongchen Du、Xinhai Zhu、Yiqian Wan
DOI:10.1021/acs.joc.7b00290
日期:2017.5.19
general and effective CuI/N′,N′-diaryl-1H-pyrrole-2-carbohydrazide catalyst system was developed for the amination of aryliodides and bromides at room temperature with good chemoselectivity between −OH and −NH2 groups. Only 5 mol % of CuI and ligands was needed in this protocol to effect the amination of various arylbromides and aryliodides with a wide range of aliphatic and aryl amines (1.3 equiv)
Mixed er-NHC/phosphine Pd(<scp>ii</scp>) complexes and their catalytic activity in the Buchwald–Hartwig reaction under solvent-free conditions
作者:Alexandra A. Ageshina、Grigorii K. Sterligov、Sergey A. Rzhevskiy、Maxim A. Topchiy、Gleb A. Chesnokov、Pavel S. Gribanov、Elizaveta K. Melnikova、Mikhail S. Nechaev、Andrey F. Asachenko、Maxim V. Bermeshev
DOI:10.1039/c9dt00216b
日期:——
A series of novel (NHC)PdCl2-PR3 complexes were synthesized and fully characterized by 1H, 13C, 31P NMR and FT-IR spectroscopy. These complexes showed high catalytic activity toward solvent-free Buchwald–Hartwig amination. Both primary and secondary amines were efficiently utilized under the same reaction conditions. The solvent-free synthesis of valuable N-aryl carbazoles and similar N-heterocyclic
合成了一系列新颖的(NHC)PdCl 2 -PR 3配合物,并通过1 H,13 C,31 P NMR和FT-IR光谱进行了全面表征。这些配合物对无溶剂的布赫瓦尔德-哈特维格胺胺化显示出很高的催化活性。在相同的反应条件下,伯胺和仲胺均得到有效利用。描述了有价值的N-芳基咔唑和类似的N-杂环体系的无溶剂合成。
Visible‐Light‐Enabled Direct Decarboxylative N‐Alkylation
作者:Vu T. Nguyen、Viet D. Nguyen、Graham C. Haug、Ngan T. H. Vuong、Hang T. Dang、Hadi D. Arman、Oleg V. Larionov
DOI:10.1002/anie.201916710
日期:2020.5.11
development of efficient and selective C-N bond-forming reactions from abundant feedstock chemicals remains a central theme in organic chemistry owing to the key roles of amines in synthesis, drug discovery, and materials science. Herein, we present a dual catalyticsystem for the N-alkylation of diverse aromatic carbocyclic and heterocyclic amines directly with carboxylicacids, by-passing their preactivation
bisphosphine monochelation to transition metals under conditions where homogeneousligands may form bischelated single metal complexes or multinuclear complexes. PS-DPPBz showed high ligand performance in first-row transition metal catalysis, enabling challenging molecular transformations that were not possible through the screening of existing homogeneousligands. In the Ni-catalyzed amination of aryl
Solvent-free and direct C(sp3)–H amination of adamantanes by grinding
作者:Zhen Wei、Jiarong Li、Ning Wang、Qi Zhang、Daxin Shi、Kening Sun
DOI:10.1016/j.tet.2014.01.014
日期:2014.2
A facile, direct and environmentally benign conversion of C(sp(3))-H bonds to C(sp(3))-N bonds using substoichiometric amount of aprotic superelectrophiles polyhalomethane-AIX(3) has been achieved by grinding under solvent-free conditions at room temperature in air. It is a general and simple method for the direct amination of adamantanes, and a series of aminoadamantanes of azoles, arylamines or heteroarylamines were obtained in good to excellent yields. The advantages of this amination are atom economy, solvent-free, chemoselectivity, short reaction time and high yields. (C) 2014 Elsevier Ltd. All rights reserved.