complex. In particular, by employing an amphiphilic dendritic NHC–gold(I) complex having penta(ethylene glycol) units at the peripheral layer as a catalyst, the aqueous media carboxylative cyclization of propargylicamines proceeded smoothly to provide the corresponding 2-oxazolidinone at room temperature under atmospheric pressure of CO2.
Ni@Pd nanoparticles supported on ionic liquid-functionalized KCC-1 as robust and recyclable nanocatalysts for cycloaddition of propargylic amines and CO<sub>2</sub>
heterogeneous catalyst systems comprised of a fibrous nanosilica‐supported nano‐Ni@Pd‐based ionic liquid (KCC‐1/IL/Ni@Pd) are described for the cyclization of propargylic amines with CO2 to provide 2‐oxazolidinones. KCC‐1 with highsurfacearea was functionalized with IL acting as a robust anchor so that the nano‐Ni@Pd was well dispersed on the fibres of the KCC‐1 microspheres, without aggregation. Because
描述了一种新型的非均相催化剂体系,该体系由纤维纳米二氧化硅支撑的基于纳米Ni @ Pd的离子液体(KCC-1 / IL / Ni @ Pd)组成,用于将炔丙基胺与CO 2环化以提供2-恶唑烷酮。高表面积的KCC-1被IL用作坚固的锚定物进行了功能化,因此nano-Ni @ Pd很好地分散在KCC-1微球的纤维上,没有聚集。由于IL的放大作用,实现了纳米催化剂的高负载能力。报告的合成方法包括无溶剂条件,操作简便,反应时间短,对环境无害的反应条件,成本效益,高原子经济性和优异的收率等诸多优点,使其成为真正的绿色方案。
Ambient Chemical Fixation of CO
<sub>2</sub>
Using a Robust Ag
<sub>27</sub>
Cluster‐Based Two‐Dimensional Metal–Organic Framework
20‐tetra(4‐pyridyl)porphyrin (TPyP‐H2) ligands to afford a robust 2D metal–organic framework (Ag27‐MOF). This silver cluster‐assembled material serves as a highly efficient heterogeneous catalyst for the cyclization of both terminal and internal propargylamines with CO2 under atmospheric pressure. Density functional theory (DFT) calculations illustrate that the high catalytic activity and broad substrate
organic molecules are on demand. Here we present two Pd-catalyzed multicomponent reactions that provide functionalized oxazolidinones from propargylamines, aryl halides and CO2 as starting materials. These transformations, devoid of high CO2 pressures, represent a streamlined stereocontrolledsynthesis of previously inaccessible versions of these useful heterocycles in an atom-economic manner, as up to