Synthesis of Benz-Fused Azoles via C-Heteroatom Coupling Reactions Catalyzed by Cu(I) in the Presence of Glycosyltriazole Ligands
作者:Nidhi Mishra、Anoop S. Singh、Anand K. Agrahari、Sumit K. Singh、Mala Singh、Vinod K. Tiwari
DOI:10.1021/acscombsci.9b00004
日期:2019.5.13
and contain multiple metal-binding units that may assist in metal-mediated catalysis. Azide derivatives of d-glucose have been converted to their respective aryltriazoles and screened as ligands for the synthesis of 2-substituted benz-fused azoles and benzimidazoquinazolinones by Cu-catalyzed intramolecular Ullmann type C-heteroatom coupling. Good to excellent yields for a variety of benz-fused heterocyles
Magnetic Copper Ferrite Nanoparticles: An Inexpensive, Efficient, Recyclable Catalyst for the Synthesis of Substituted Benzoxazoles via Ullmann-Type Coupling under Ligand-Free Conditions
作者:Hua Wang、Daoshan Yang、Xiao Zhu、Wei Wei、Min Jiang、Ning Zhang、Dandan Ren、Jinmao You
DOI:10.1055/s-0033-1340599
日期:——
A new sustainable strategy for the synthesis of benzoxazoles from substituted N -(2-halophenyl)benzamides was developed in which inexpensive, readily available, air-stable, recyclable copper(II) ferrite serves as a nanocatalyst. The nanocatalyst can be completely recovered with an external magnet and can be used seven times without significant loss of catalytic activity.
开发了一种从取代的 N-(2-卤代苯基)苯甲酰胺合成苯并恶唑的新可持续策略,其中廉价、易得、空气稳定、可回收的铁酸铜 (II) 作为纳米催化剂。纳米催化剂可以通过外部磁铁完全回收,可以使用七次而催化活性没有显着损失。
A comparative study of the catalytic activity of Co- and CoFe<sub>2</sub>O<sub>4</sub>-NPs in C–N and C–O bond formation: synthesis of benzimidazoles and benzoxazoles from o-haloanilides
作者:Abdol R. Hajipour、Zahra Khorsandi
DOI:10.1039/c6nj02293f
日期:——
ligand-free and mild reactionconditions. All the reactions resulted in moderate to excellent yields under the optimized reactionconditions; however, the reactions using Co-NPs as the catalyst were completed in relatively shorter reaction times. Furthermore, analysis showed that the reusability of the two catalytic systems is approximately comparable.
合成了钴铁氧体(CoFe 2 O 4 -NPs)和纯钴(Co-NPs)的纳米粒子,表征后,研究和比较了它们对脱卤分子内C-O和C-N键形成反应的催化活性。这些廉价而高效的催化剂能够创造出在绿色介质中合成苯并咪唑和苯并恶唑的新方法,且无配体且反应条件温和。在优化的反应条件下,所有反应均产生中等至极好的收率。然而,使用Co-NP作为催化剂的反应在相对较短的反应时间内完成。此外,分析表明,两个催化体系的可重复使用性大致相当。
Copper-catalysed intramolecular O-arylation: a simple and efficient method for benzoxazole synthesis
作者:Fengtian Wu、Jie Zhang、Qianbing Wei、Ping Liu、Jianwei Xie、Haojie Jiang、Bin Dai
DOI:10.1039/c4ob02068e
日期:——
An efficient protocol has been developed for the copper-catalysed intramolecular cyclization of N-(2-iodo-/bromo-/chloro-phenyl)benzamides for the synthesis of 2-substituted benzoxazoles.
Simmons–Smith Cyclopropanation of Alkenyl 1,2-Bis(boronates): Stereoselective Access to Functionalized Cyclopropyl Derivatives
作者:Maruti Mali、Gangavaram V. M. Sharma、Subhash Ghosh、Thierry Roisnel、Bertrand Carboni、Fabienne Berrée
DOI:10.1021/acs.joc.2c00152
日期:2022.6.17
A Simmons–Smith stereodefined procedure for the synthesis of cyclopropyl-1,2-bis(boronates) has been developed starting from the corresponding alkenes. The resulting compounds were then subjected to regioselective Suzuki–Miyaura couplings to produce diversely tri- or tetra-substituted arylcyclopropanes in good yields. Further functionalization with 2-lithiothiophene provided 1,2-bis(aryl)cyclopropanes