Superparamagnetic Fe(OH)<sub>3</sub>@Fe<sub>3</sub>O<sub>4</sub> Nanoparticles: An Efficient and Recoverable Catalyst for Tandem Oxidative Amidation of Alcohols with Amine Hydrochloride Salts
nanoparticles were successfully prepared and characterized. This magnetic nanocomposite was employed as an efficient, reusable, and environmentally benign heterogeneous catalyst for the direct amidation of alcohols with aminehydrochloridesalts. Several derivatives of primary, secondary and tertiary amides were synthesized in moderate to good yields in the presence of this catalytic system. The catalyst was
磁性Fe(OH)3 @Fe 3 O 4纳米粒子的制备和表征成功。该磁性纳米复合材料用作将醇与胺盐酸盐直接酰胺化的有效,可重复使用且对环境无害的多相催化剂。在该催化体系的存在下,以中等至良好的产率合成了伯,仲和叔酰胺的几种衍生物。该催化剂已成功回收利用,最多可重复使用六次,而不会显着降低其催化活性。
Oxidative amidation by Cu(<scp>ii</scp>)–guanidine acetic acid immobilized on magnetized sawdust with eggshell as a natural base
Copper(II)–guanidine acetic acidcomplex was immobilized on the surface of magnetized raw waste sawdust (SD) as an abundant natural biopolymer and employed as an efficient and recoverable catalyst in oxidative amidation reaction, while waste eggshell (ES) powder was used as a low-cost solid base. The magnetic raw catalyst was fully characterized using FTIR, XRD, SEM, EDX, TGA, and VSM. A variety of
Copper-catalysed reductive amination of nitriles and organic-group reductions using dimethylamine borane
作者:Dominic van der Waals、Alan Pettman、Jonathan M. J. Williams
DOI:10.1039/c4ra11193a
日期:——
heterogeneous copper catalyst, formed in situ, has been shown to dehydrocouple commercially available amine boranes whilst transferring hydrogen for the reduction of selected organic functional groups in an aqueous medium. The catalytic system has also been shown to promote the reductiveamination of aryl nitriles.
Enantioselective Alkyne Conjugate Addition Enabled by Readily Tuned Atropisomeric <i>P</i>,<i>N</i>-Ligands
作者:Sourabh Mishra、Ji Liu、Aaron Aponick
DOI:10.1021/jacs.7b00363
日期:2017.3.8
structure, the 5-membered chiral biaryl heterocyclic scaffold represents a departure from 6-membered P,N-ligands that facilitates tuning and enables ligand evolution to address issues of selectivity and reactivity. In this vein, the Cu-catalyzedenantioselective conjugate alkynylation of Meldrum's acid acceptors is reported using Me-StackPhos. Enabled by this new ligand, the reaction tolerates a wide range
Hypervalent iodine-catalyzed oxidative amidation of methylarenes
作者:Kobra Azizi、Meghdad Karimi、Akbar Heydari
DOI:10.1039/c4ra04215h
日期:——
iodine-catalyzed oxidative amidation of methylarenes to the corresponding amides by using an oxidant (tert-butylhydroperoxide, 70% aqueous solution) is discussed. This oxidizing agent presented a high degree of selectivity for the oxidation of toluene to amide without oxidation to carboxylicacid. This reaction involves metal-free oxidation, a mild reaction condition and tert-butyl alcohol as the only