Fe3O4@Hydrotalcite-NH2-CoII NPs: A novel and extremely effective heterogeneous magnetic nanocatalyst for synthesis of the 1-substituted 1H-1, 2, 3, 4-tetrazoles
promotes condensation between sodium azide, triethyl ortho-formate, and diversity of heterocyclic/aromatic amines. Also, an environmentally toxic solvent was eliminated. A significant improvement in the synthetic efficacy (95%, yield) was obtained by this new sustainable and eco-friendly protocol as well as high purity. The current procedure as a green protocol offers benefits including a simple operational
The sequential reactions of tetrazoles with bromoalkynes for the synthesis of (Z)-N-(2-bromo-1-vinyl)-N-arylcyanamides and 2-arylindoles
作者:Jiajun Zhang、Ling-Guo Meng、Pinhua Li、Lei Wang
DOI:10.1039/c3ra40669e
日期:——
2-Arylindoles were prepared by a sequential reaction of Ag-catalyzed α-addition–Pd-catalyzed C–H bond functionalization of tetrazoles with bromoalkynes. A stereocontrolled Ag-catalyzed α-addition reaction of tetrazoles with bromoalkynes underwent smoothly to generate (Z)-N-(2-bromo-1-vinyl)-N-arylcyanamides, which were subsequently converted into 2-arylindoles through an intramolecular cyclization by Pd-catalyzed direct C–H bond functionalizations.
通过四唑与溴炔的 Ag 催化 α-加成-Pd 催化 C-H 键官能化的顺序反应制备了 2-芳基吲哚。在 Ag 催化下,四唑与溴炔发生了立体控制的 α 加成反应,顺利生成了 (Z)-N-(2-溴-1-乙烯基)-N-芳基氰酰胺,随后通过 Pd 催化的直接 C-H 键官能化反应将其分子内环化为 2-芳基吲哚。
Green synthesis of the 1‐substituted 1H‐1, 2, 3, 4‐tetrazoles over bifunctional catalyst based on copper intercalated into Mg/Al hydrotalcite modified magnetite nanoparticles
作者:Mehri Salimi、Azadeh Zamanpour
DOI:10.1002/aoc.5682
日期:2020.8
An effective one‐pot, convenient process for the synthesis of 1‐ substituted 1H‐tetrazoles from triethyl orthoformate, amines, and sodium azide is described using copper (II) doped and immobilized on functionalized magnetic hydrotalcite (Fe3O4/HT‐NH2 CuII) as a novel recyclable catalyst. The application of this catalyst allows the synthesis of a variety of tetrazoles in good to excellent yields in
使用掺杂并固定在功能化磁性水滑石(Fe 3 O 4 / HT-NH )上的铜(II)描述了一种从原甲酸三乙酯,胺和叠氮化钠合成1-取代的1H-四唑的有效的一锅便捷方法2铜II)作为一种新型可回收催化剂。该催化剂的应用允许在水中以良好至优异的产率合成多种四唑。使用傅立叶变换红外(FT-IR)光谱,X射线衍射(XRD),扫描电子显微镜(SEM),能量色散X射线光谱(EDX),热重分析(TGA),振动样品对新型催化剂进行表征磁力分析(VSM)和电感耦合等离子体分析(ICP-OES)。这种新方法具有几个优点,例如操作简便,实用性强,对各种基材的适用性强,并且无需任何繁琐的后处理或纯化。Cu II(掺杂和固定化)在功能化磁性水滑石上的负载量为4.66 mmol g -1从ICP-OES分析获得。而且,优异的催化性能,热稳定性和催化剂的分离性使其成为出色的多相体系,并且是其他多相催化剂的有用替代品。同
Synthesis of amides through an oxidative amidation of tetrazoles with aldehydes under transition-metal-free conditions
作者:Juan Du、Kai Luo、Xiuli Zhang
DOI:10.1039/c4ra07658c
日期:——
A simple, inexpensive and efficient one-pot synthesis of amides was achieved in good yields via the direct oxidativeamidation of tetrazoles with aldehydes under transition-metal-free conditions.
SiO<sub>2</sub>–H<sub>3</sub>BO<sub>3</sub>promoted solvent-free, green and sustainable synthesis of bioactive 1-substituted-1H-tetrazole analogues
作者:Mehtab Parveen、Faheem Ahmad、Ali Mohammed Malla、Shaista Azaz
DOI:10.1039/c4nj02079k
日期:——
1-substituted-1H-tetrazole analogues 4(a–o) were synthesized, which were typically accessed via a facile, solvent-free and green synthetic protocol. The reaction involves expeditious reusable catalyst (SiO2–H3BO3) promoted condensation between a variety of heterocyclic/aromatic amines, sodium azide and triethyl ortho-formate, eliminating the use of an environmentally toxic solvent. This new eco-friendly and sustainable