Shedding light on the use of Cu(<scp>ii</scp>)-salen complexes in the A<sup>3</sup> coupling reaction
作者:Stavroula I. Sampani、Victor Zdorichenko、Marianna Danopoulou、Matthew C. Leech、Kevin Lam、Alaa Abdul-Sada、Brian Cox、Graham J. Tizzard、Simon J. Coles、Athanassios Tsipis、George E. Kostakis
DOI:10.1039/c9dt04146j
日期:——
phenoxido salen based ligands. These ligands orchestrate topological control permitting alkyne binding with concomitant activation of the C–H bond and simultaneously acting as a template temporarily accommodating the abstracted acetylenic proton, and continuously generating, via in situ formed radicals and a Single Electron Transfer (SET) mechanism, a transient Cu(I) active site to facilitate this transformation
Structural and Electronic Control of the Bidentate 1‐(2‐pyridyl)benzotriazole Ligand in Copper Chemistry with Application to Catalysis in the A
<sup>3</sup>
Coupling Reaction
作者:Stavroula I. Sampani、Victor Zdorichenko、Jack Devonport、Gioia Rossini、Matthew C. Leech、Kevin Lam、Brian Cox、Alaa Abdul‐Sada、Alfredo Vargas、George E. Kostakis
DOI:10.1002/chem.202004781
日期:2021.3
The hybrid bidentate 1‐(2‐pyridyl)benzotriazole (pyb) ligand was introduced into 3d transition metal catalysis. Specifically, [CuII(OTf)2(pyb)2]⋅2 CH3CN (1) enables the synthesis of a wide range of propargylamines by the A3 coupling reaction at room temperature in the absence of additives. Experimental and high‐level theoretical calculations suggest that the bridging N atom of the ligand imposes exclusive
Efficient multicomponent synthesis of propargylamines catalyzed by Cu(I) complexes encompassing hydrazone ligands under solvent-free condition
作者:Sekar Gayathri、Periasamy Viswanathamurthi、Jan Grzegorz Malecki
DOI:10.1016/j.ica.2022.120853
日期:2022.5
were utilized as reusable homogeneous catalysts in A3 coupling reactions involving aldehydes, amines and phenyl acetylene for the synthesis of propargylaminesundersolvent-freeconditions. Particularly, complex 2 has been found to be highly efficient in the synthesis of propargylamines. Many novel compounds have been synthesized based on A3 coupling reaction and the formation of new compounds was confirmed
The reported Cu(II) metal–organic cage (Cu3L2, 1) can be a highly active reusable catalyst to homogeneously catalyze the A3-coupling reaction in CHCl3 and can be heterogeneously recovered by simply adding 1,4-dioxane via formation of the insoluble metal–organicframework (Cu3L2(1,4-dioxane)1.5, 2).
Zn(<scp>ii</scp>) anchored onto the magnetic natural hydroxyapatite (Zn<sup>II</sup>/HAP/Fe<sub>3</sub>O<sub>4</sub>): as a novel, green and recyclable catalyst for A<sup>3</sup>-coupling reaction towards propargylamine synthesis under solvent-free conditions
作者:Zeinab Zarei、Batool Akhlaghinia
DOI:10.1039/c6ra20501a
日期:——
in shape. Also, VSM analysis showed that the synthesized nanocatalyst had superparamagnetic behavior. The new nanocatalyst has been found to effectively catalyze the synthesis of structurally different propargylamine derivatives via a one-pot three-component A3-coupling reaction of terminal alkynes, aldehydes and secondary amines in high yields at 100 °C under solvent-free conditions. This green protocol
在本文中,制备了一种固定在磁性天然羟基磷灰石上的Zn(II)(Zn II / HAP / Fe 3 O 4),它是一种新型的,多用途且可磁回收的催化剂,并使用诸如FT-IR,XRD的不同技术进行了表征。 ,TGA,TEM,EDX,VSM和ICP。确定了该催化剂的组成,并且清楚地发现颗粒的大小约为8–30 nm,并且它们呈棒状。另外,VSM分析表明合成的纳米催化剂具有超顺磁性行为。已发现新型纳米催化剂可通过一锅三组分A 3有效催化结构不同的炔丙基胺衍生物的合成。-无溶剂条件下,末端炔烃,醛和仲胺的偶合反应在100°C下高收率。这种绿色方案具有显着的优势,例如出色的产品收率,宽泛的底物范围,温和的反应条件,最小化化学废物,简单的后处理程序,易于制备的催化剂以及对环境无害。重要的是,可以通过施加外部磁场来回收制备的纳米催化剂,并在没有明显损失活性的情况下重复使用七个循环。