Dynamic functionalised metallogel: An approach to immobilised catalysis with improved activity
摘要:
A metal-organic gel (MOG) route to immobilised catalysts has been developed based on the reversibility of coordination bond formation in a Fe3+-carboxylate MOG. The ferric gel was rationally designed based on a bifunctional ligand, 5-1H-benzo[d]imidazole-1,3-dicarboxylic acid (L1), in which the imidazole N atom may further hind to a soft ion like Pd2+ more strongly Clue to the HSAB matching. Palladium(II) was successfully loaded in the gel to yield a supported coordination catalyst. Compared with its homogeneous counterparts, the immobilised gel catalyst exhibited significantly improved catalytic activity Under mild conditions as shown in Suzuki-Miyaura C-C coupling, and Could be reused for several times. (C) 2009 Elsevier B.V. All rights reserved.
Rh(I)-Catalyzed Arylation of Heterocycles via C−H Bond Activation: Expanded Scope through Mechanistic Insight
作者:Jared C. Lewis、Ashley M. Berman、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1021/ja0748985
日期:2008.2.1
A practical, functional group tolerant method for the Rh-catalyzed direct arylation of a variety of pharmaceutically important azoles with aryl bromides is described. Many of the successful azole and aryl bromide coupling partners are not compatible with methods for the direct arylation of heterocycles using Pd(0) or Cu(I) catalysts. The readily prepared, low molecular weight ligand, Z-1-tert-butyl-2
Visible-Light Photoredox Catalyzed Double C–H Functionalization: Radical Cascade Cyclization of Ethers with Benzimidazole-Based Cyanamides
作者:Si Jiang、Xiao-Jing Tian、Shu-Yao Feng、Jiang-Sheng Li、Zhi-Wei Li、Cui-Hong Lu、Chao-Jun Li、Wei-Dong Liu
DOI:10.1021/acs.orglett.0c03853
日期:2021.2.5
simple ethers with cyanamides is developed at roomtemperature. This strategy involves sequential inert Csp3-H/Csp2-H functionalizations through intermolecular addition reaction of oxyalkyl radicals to N-cyano groups followed by radical cyclization of iminyl radicals in situ generated with C-2 aryl rings. This method allows for efficient synthesis of tetracyclic benzo[4,5]imidazo[1,2-c]quinazolines. Importantly
在室温下开发了一种简单的醚与氰胺的可见光光氧化还原催化的自由基级联环化反应。该策略涉及通过氧烷基自由基与N-氰基的分子间加成反应,随后通过C-2芳基环原位产生的亚氨基自由基的自由基环化,依次进行惰性C sp3- H / C sp2- H官能化。该方法可以有效合成四环苯并[4,5]咪唑并[1,2- c ]喹唑啉。重要的是,这是氰酰胺分子间-分子间自由基级联环化反应的第一个例子。
Visible light promoted PANI@Au:CuO catalyzed sequential amination, azidation and annulation for the preparation of 2-arylbenzimidazoles
A protocol describing PANI@Au:CuO photocatalyzed sequential amination/azidation/annulation reactions to prepare 2-aryl benzimidazole derivatives has been developed.
Copper(II)-Catalyzed Oxidative Coupling of Anilines, Methyl Arenes, and TMSN<sub>3</sub> via C(sp<sup>3</sup>/sp<sup>2</sup>)–H Functionalization and C–N Bond Formation
Copper(II)-catalyzed cross-coupling of anilines, methyl arenes, and TMSN3 in the presence of tert-butylhydroperoxide at moderate temperature produced 2-aryl benzimidazoles via a tandem C(sp3/sp2)–H functionalization and C–N bond formations. The selectivity and multiple C–H functionalization of the simple substrates are significant practical features.
Tetrathienoanthracene-functionalized conjugated microporous polymers as an efficient, metal-free visible-light solid organocatalyst for heterogeneous photocatalysis
作者:Chang-An Wang、Jian-Ping Zhang、Kun Nie、Yan-Wei Li、Qun Li、Guo-Zheng Jiao、Jian-Guo Chang、Yin-Feng Han
DOI:10.1039/d1cy00488c
日期:——
and molecularly tunable optoelectronic properties, conjugatedmicroporouspolymers (CMPs) have been receiving increasing attention and research interest as promising alternatives to traditional inorganic semiconductors for heterogeneous photocatalysis. Herein, we report the concise synthesis of tetrathienoanthracene-based conjugatedmicroporouspolymers (TTA-CMP) via a bottom-up strategy. TTA-CMP was