聚苯胺(PANI)负载的Cu(Cu / PANI)催化剂可作为有效的非均相催化剂,用于通过点击化学方法区域选择性合成1,4-二取代-1 H -1,2,3-三唑。在本文中,我们通过界面聚合方法说明了使用PANI作为固体载体的两种铜基非均相催化剂的开发。该催化剂可以容易地再循环和再利用,从而产生了极佳的三唑产率。该方案的主要优点是易于制备,催化剂的多相性质,使用水作为助溶剂和室温反应条件。在本文中,已经描述了使用我们开发的Cu-PANI催化剂合成1 H -1,2,3-三唑的三种不同方案。
A silica-supported silver complex, Ag–NHC@SiO2, was prepared by an anchoring coordination technique, which was successfully employed for the click reaction under mild reaction conditions.
Nickel-Catalyzed Azide–Alkyne Cycloaddition To Access 1,5-Disubstituted 1,2,3-Triazoles in Air and Water
作者:Woo Gyum Kim、Mi Eun Kang、Jae Bin Lee、Min Ho Jeon、Sungmin Lee、Jungha Lee、Bongseo Choi、Pedro M. S. D. Cal、Sebyung Kang、Jung-Min Kee、Gonçalo J. L. Bernardes、Jan-Uwe Rohde、Wonyoung Choe、Sung You Hong
DOI:10.1021/jacs.7b06338
日期:2017.9.6
Herein, we report a method to access 1,5-disubstituted 1,2,3-triazoles using a Cp2Ni/Xantphos catalytic system. The reaction proceeds both in water and organic solvents at room temperature. This protocol is simple and scalable with a broad substrate scope including both aliphatic and aromatic substrates. Moreover, triazoles attached with carbohydrates or amino acids are prepared via this cycloaddition
Copper(i)-catalyzed cycloaddition of silver acetylides and azides: Incorporation of volatile acetylenes into the triazole core
作者:Ilaria Proietti Silvestri、Fikre Andemarian、George N. Khairallah、Su Wan Yap、Tim Quach、Sammi Tsegay、Craig M. Williams、Richard A. J. O'Hair、Paul S. Donnelly、Spencer J. Williams
DOI:10.1039/c1ob05360d
日期:——
Silver acetylides and organic azides react under copper(I) catalysis to afford 1,4-disubstituted 1,2,3-triazoles. Mechanistic studies implicate a process involving transmetallation to copper acetylides prior to cycloaddition. This work demonstrates that silver acetylides serve as suitable precursors for entry into copper-mediated coupling reactions. This methodology allows the incorporation of volatile
Silica immobilized copper N‐heterocyclic carbene: An effective route to 1,2,3‐triazoles via azide‐alkyne cycloaddition and multicomponent click reaction
supported copper N-heterocyclic carbene (Cu-NHC@SiO2) complex is prepared and characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) analyses. This complex is an efficient and easily retrievable catalyst for 1,2,3-triazole synthesis through direct azide-alkyne cycloaddition reaction as well as one-pot reaction using arylboronic
制备了一种新型二氧化硅负载的铜 N-杂环卡宾 (Cu-NHC@SiO 2 ) 配合物,并通过扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDX) 和 X 射线光电子能谱 (XPS) 分析表征。该配合物是一种有效且易于回收的催化剂,用于通过直接叠氮化物-炔烃环加成反应以及使用芳基硼酸的一锅反应合成 1,2,3-三唑。该催化体系也适用于从各种苯甲醛合成 4-芳基-NH-1,2,3-三唑。此外,对于通过直接叠氮化物-炔烃环加成和多组分反应合成 1,2,3-三唑的所有三种方法,催化剂可以有效地循环至第五次循环。
A tris(benzyltriazolemethyl)amine-based cage as a CuAAC ligand tolerant to exogeneous bulky nucleophiles
The canonical CuAAC–ligand TBTA was capped with a bowl-shaped unit yielding the cage Hm-TBTA. The shielded structure does not suffer from product inhibition effect and is remarkably tolerant to the biological CuAAC-inhibitor Glutathione.