Introducing Axial Chirality into Mesoionic 4,4′-Bis(1,2,3-triazole) Dicarbenes
摘要:
Mesoionic 4,4'-bis(1,2,3-triazole-5,5'-diylidene) Rh(I) complexes having a C2 chiral 4,4'-axis were accessed from 3-alkyltriazolium salts in virtually complete de. Their structure and configurational integrity were assessed by NMR spectroscopy, X-ray crystallography, and chiral HPLC. Computational analysis of the MICs involved in the reaction suggested the formation of a highly stable and unprecedented cation-carbene intermediate species, which could be evidenced experimentally by cyclic voltammetry analysis.
4-Organochalcogenoyl-1H-1,2,3-triazoles: synthesis and functionalization by a nickel-catalyzed Negishi cross-coupling reaction
摘要:
A general method for the synthesis of triazoles containing selenium and tellurium was accomplished via a CuCAAC reaction between organic azides and a terminal triple bond, generated by in situ deprotection of the silyl group. The reaction tolerates alkyl and arylazides, with alkyl and aryl substituents directly bonded to the chalcogen atom. The products were readily functionalized by a nickel-catalyzed Negishi cross-coupling reaction, furnishing the aryl-heteroaryl products at the 4-position in good yields. (C) 2012 Elsevier Ltd. All rights reserved.
Copper-Catalyzed Huisgen and Oxidative Huisgen Coupling Reactions Controlled by Polysiloxane-Supported Amines (AFPs) for the Divergent Synthesis of Triazoles and Bistriazoles
click reactions mediated by a polysiloxane‐supported secondary amine allow the preparation of novel heterocyclic compounds, that is, bistriazoles. Comparably, it is also surprising that the use of a diamine‐functional polysiloxane as ligand led to a classic Huisgen [3+2] cycloaddition in excellent yields. From the results of the present amine‐functional polysiloxanes‐controlledHuisgenreaction or oxidative
Synthesis and Characterization of Copper(I)‐Cysteine Complex Supported on Magnetic Layered Double Hydroxide as an Efficient and Recyclable Catalyst System for Click Chemistry Using Choline Azide as Reagent and Reaction Medium
Abstract In this study, Fe 3 O 4 @LDH@cysteine–Cu(I) nanoparticles as a novel and recyclable catalytic system was designed and successfully synthesized. These nanoparticles show high catalytic activity for preparation of the triazole family through reaction of the organic halides with alkynes in the presence of choline azide as reagent and reaction medium. In addition, Fe 3 O 4 @LDH@cysteine–Cu(I)
摘要 在本研究中,设计并成功合成了 Fe 3 O 4 @LDH@半胱氨酸-Cu(I) 纳米粒子作为一种新型可回收的催化体系。这些纳米颗粒在叠氮化胆碱作为试剂和反应介质的情况下,通过有机卤化物与炔烃的反应,对制备三唑族显示出高催化活性。此外,Fe 3 O 4 @LDH@cysteine-Cu(I) 可以很容易地回收和重复使用五次,催化活性没有任何显着损失。图形摘要
Dual roles of substituted thiourea as reductant and ligand in CuAAC reaction
efficient catalytic system, CuSO4·5H2O/1-(4-methoxyphenyl)-3-phenylthiourea, for the copper(I)-catalyzed azide–alkyne cycloaddition reaction (CuAAC) was discovered. In the above catalytic system, substitutedthiourea acts both as a reductant and a ligand. CuSO4·5H2O/1-(4-methoxyphenyl)-3-phenylthiourea is both an economical and efficient catalyst for the CuAAC reaction. In addition, the new catalytic system
发现了一种高效的催化体系CuSO 4 ·5H 2 O / 1-(4-甲氧基苯基)-3-苯基硫脲,用于铜(I)催化的叠氮化物-炔烃环加成反应(CuAAC)。在上述催化体系中,取代的硫脲既充当还原剂又充当配体。CuSO 4 ·5H 2 O / 1-(4-甲氧基苯基)-3-苯基硫脲是CuAAC反应的经济有效的催化剂。此外,新的催化系统具有有利的功能,包括温和的绿色反应条件以及广泛的底物相容性。用CuSO 4 ·5H 2制备了各种具有良好产率的1,4-二取代的1,2,3-三唑O / 1-(4-甲氧基苯基)-3-苯基硫脲在水溶液中的催化体系。
Synthesis and characterization of active cuprous oxide particles and their catalytic application in 1,2,3‐triazole synthesis via alkyne‐azide cycloaddition reaction in water
作者:Micky Lanster Sawkmie、Dipankar Paul、Gitumoni Kalita、Khushboo Agarwala、Pradip K. Maji、Paresh Nath Chatterjee
DOI:10.1002/jhet.3723
日期:2019.12
the catalytic prowess of the various cuprous oxide materials in the cycloaddition reaction of alkynes and azides to synthesize 1,4‐disubstituted‐1,2,3‐triazoles. A wide variety of substitutions can nicely be tolerated in our optimized reaction conditions to produce very good to excellent yields of the corresponding triazoles in water at 55 °C. The reactions are carried out in water without any assistance
An efficient and recyclable thiourea-supported copper(<scp>i</scp>) chloride catalyst for azide–alkyne cycloaddition reactions
作者:Milan Kr. Barman、Ashish Kumar Sinha、Sharanappa Nembenna
DOI:10.1039/c5gc02545a
日期:——
A reaction between two equivalents of bulky thiourea i.e., 1-3-bis(2,6-dimethylphenyl)thiourea(L) [L = (ArNH)2C=S); (Ar = 2,6-Me2C6H3)}] and CuCl2 or CuCl in THF solvent afforded a bulky thiourea stabilized copper(I) halide...