Synthesis of 2H-Indazoles by the [3 + 2] Dipolar Cycloaddition of Sydnones with Arynes
摘要:
A rapid and efficient synthesis of 2H-indazoles has been developed using a [3 + 2] dipolar cycloaddition of sydnones and arynes. A series of 2H-indazoles have been prepared in good to excellent yields this protocol, and subsequent Pd-catalyzed coupling reactions can be applied to the halogenated products to generate a structurally diverse library of indazoles.
Silica‐supported Cu(II)–quinoline complex: Efficient and recyclable nanocatalyst for one‐pot synthesis of benzimidazolquinoline derivatives and 2
<i>H</i>
‐indazoles
作者:Hashem Sharghi、Mahdi Aberi、Pezhman Shiri
DOI:10.1002/aoc.4974
日期:2019.7
The synthesis, characterization and catalytic activity of a Cu(II) complex derived from 2‐oxoquinoline‐3‐carbaldehyde Schiff base supported on amino‐functionalized silica are reported. 3‐(1H‐Benzo[d]imidazol‐2‐yl)quinolines containing piperidine, morpholine and phenylpiperazine skeletons at the C‐2 position were formed in good to excellent yields via the one‐pot reaction of 2‐chloroquinoline‐3‐carbaldehyde
报道了由氨基官能化二氧化硅负载的2-氧代喹啉-3-甲醛甲醛席夫碱衍生的Cu(II)配合物的合成,表征和催化活性。通过2-氯喹啉-3-的一锅反应,形成了在C-2位置含有哌啶,吗啉和苯基哌嗪骨架的3-(1 H-苯并[ d ]咪唑-2-基)喹啉。在温和条件下,在纳米催化剂存在下,甲醛,苯1,2-二胺和仲胺。此外,发现纳米催化剂可循环使用多达七次,而活性没有明显损失。另外,通过2-溴苯甲醛,叠氮化钠和伯胺的催化缩合反应,合成了一系列2 H-吲唑。
Ligand-Free Copper(I) Oxide Nanoparticle Catalyzed Three-Component Synthesis of 2H-Indazole Derivatives from 2-Halobenzaldehydes, Amines and Sodium Azide in Polyethylene Glycol as a Green Solvent
作者:Hashem Sharghi、Mahdi Aberi
DOI:10.1055/s-0033-1340979
日期:——
An efficientsynthesis of 2H-indazole derivatives based on the one-pot three-component reaction of 2-chloro- and 2-bromobenzaldehydes, primary amines and sodium azide is described. The reaction is catalyzed by copper(I) oxidenanoparticles (Cu2O-NP) under ligand-free conditions in polyethylene glycol (PEG 300) as a green solvent.
heteroarenes are biologically active compounds and useful building blocks. In this study, we have developed a metal- and oxidant-free, environmentally friendly protocol for the regioselective selenylation of 2H-indazole derivatives by an electrochemical strategy. A number of selenylated 2H-indazoles with a wide range of functional groups have been synthesized in moderate to good yields under mild and
Highly reusable support‐free copper(II) complex of
<i>para</i>
‐hydroxy‐substituted salen: Novel, efficient and versatile catalyst for C─N bond forming reactions
作者:Hashem Sharghi、Mahdi Aberi、Pezhman Shiri
DOI:10.1002/aoc.3761
日期:2017.11
An air‐stable, highly active and versatile method for C─N bondformingreactions is reported. Under mild conditions using a highly reusable support‐free Cu(II)–salen complex, structurally diverse N‐aryl‐substituted compounds were obtained via direct C─N bondformingreaction of HN‐heterocycles with aryl iodides or three‐component C─N bondformingreaction of 2‐bromobenzaldehyde, aniline derivatives
An efficient synthesis of 2H-indazoles via reductive cyclization of 2-nitrobenzylamines induced by low-valent titanium reagent
作者:Fang Sun、Xian Feng、Xuan Zhao、Zhi-Bin Huang、Da-Qing Shi
DOI:10.1016/j.tet.2012.03.043
日期:2012.5
An efficient and improved synthesis of 2H-indazoles via reductive cyclization of 2-nitrobenzylamines induced by low-valenttitaniumreagent (TiCl4/Zn) is described. In this reaction triethylamine (TEA) was used to control the pH value. This method has the advantages of easily accessible starting materials, convenient manipulation, higher yield, shorter reaction time, and wider substrate scope.