Catalyst-free 1,3-dipolar cycloaddition of 3-nitrochromen with sodium azide: a facile method for the synthesis of 4-aryl-1,4-dihydrochromeno[4,3-d][1,2,3]triazole derivatives
摘要:
1,3-Dipolar cycloaddition of 3-nitrochromen with sodium azide under catalyst-free conditions afforded 4-aryl-1,4-dihydrochromeno[4,3-d][1,2,3]triazole derivatives at 80 degrees C in DMSO is described. The generality of this reaction was demonstrated by synthesizing an array of 4-aryl-1,4-dihydrochromeno[4,3d][1,2,3]triazole derivatives. Clean reaction conditions, easy isolation, and good yields of the triazoles are the salient features of the methodology. (C) 2009 Elsevier Ltd. All rights reserved.
Convenient construction of tetrahydrochromeno[4′,3′:2,3]indolizino[8,7-<i>b</i>]indoles and tetrahydroindolizino[8,7-<i>b</i>]indoles <i>via</i> one-pot domino reaction
作者:Jing Sun、Wang Jiang、Chao-Guo Yan
DOI:10.1039/c8ra05138k
日期:——
tetrahydrochromeno[4′,3′:2,3]indolizino[8,7-b]indoles were conveniently synthesized in high yields by one-pot domino reaction of tryptamines, alkyl propiolates and 2-aryl-3-nitro-2H-chromenes. Under similar conditions, the one-pot reaction of tryptamines, alkyl propiolates and β-nitroalkenes resulted in functionalized tetrahydroindolizino[8,7-b]indoles. The reaction mechanism involved sequential generation
通过色胺、丙炔酸烷基酯和2-芳基-3-硝基-2的一锅多米诺反应,方便、高产率地合成了功能化四氢苯并[4',3':2,3]吲嗪基[8,7- b ]吲哚H-色烯。在相似的条件下,色胺、丙炔酸烷基酯和β-硝基烯烃的一锅反应生成了功能化的四氢吲哚并[8,7- b ]吲哚。反应机理包括β-烯胺酯的连续生成、Michael加成、Pictet-Spengler反应和成环过程。该反应表现出较高的原子经济性并达到了可持续化学的目标。
Augmentation of Enantioselectivity by Spatial Tuning of Aminocatalyst: Synthesis of 2-Alkyl/aryl-3-nitro-2<i>H</i>-chromenes by Tandem Oxa-Michael–Henry Reaction
作者:Rahul Mohanta、Ghanashyam Bez
DOI:10.1021/acs.joc.9b03366
日期:2020.4.3
The asymmetric oxa-Michael addition of salicylaldehyde to conjugatednitroalkenes often suffers from poor reactivity and selectivity and a long reaction time. Because of the formation of an iminium ion with aminocatalyst, the nucleophilicity of the phenolic hydroxy group in salicylaldehyde reduces further to make the oxa-Michael reaction reversible. Here, we report a structurally simple and easily
Direct Synthesis of 6H-Chromeno[3,4-b]quinolin-6-ol Derivatives from Substituted 3-Nitro-2H-chromenes and 2-Nitrobenzaldehydes Mediated by Fe/AcOH System
作者:Cunde Wang、Xushun Qing、Ting Wang、Chenlu Dai、Zhenjie Su
DOI:10.1055/s-0036-1589154
日期:2018.3
4-b]quinolines was developed. This reaction involves the sequential reduction, hydrolysis, aldolcondensation, intramolecular addition, and the nucleophilic addition of substituted 2-aryl-3-nitro-2H-chromenes with substituted 2-nitrobenzaldehydes to give the corresponding 6H-chromeno[3,4-b]quinolines. This transformation provides a straightforward synthetic protocol for constructing substituted 6H-chromeno[3
摘要 取代的2-芳基-3-硝基-2 H-色烯与取代的2-硝基苯甲醛的高效铁/乙酸体系介导的还原环化反应,用于合成6-芳基-6 H-色酚[3,4- b ]喹啉被开发出来。该反应包括顺序地还原,水解,羟醛缩合,分子内加成以及取代的2-芳基-3-硝基-2 H-色烯与取代的2-硝基苯甲醛的亲核加成反应,得到相应的6 H -chromeno [3,4 - b〕喹啉。该转化为构建取代的6 H -chromeno [3,4- b]喹啉衍生物。通过X射线晶体学证实了三种典型产物的结构。 取代的2-芳基-3-硝基-2 H-色烯与取代的2-硝基苯甲醛的高效铁/乙酸体系介导的还原环化反应,用于合成6-芳基-6 H-色酚[3,4- b ]喹啉被开发出来。该反应包括顺序地还原,水解,羟醛缩合,分子内加成以及取代的2-芳基-3-硝基-2 H-色烯与取代的2-硝基苯甲醛的亲核加成反应,得到相应的6 H -chromeno
Monosaccharide amine and 3-nitro-2-phenyl-2H-chromene based inhibitors of glucose kinases
申请人:UNIVERSITY OF SOUTH CAROLINA
公开号:US11059842B2
公开(公告)日:2021-07-13
Inhibitor compounds with biological activity against kinetoplastid parasites, along with methods of use of the compounds, are provided. The compounds can be used to strongly inhibit key drug targets found in protozoan parasites, e.g., the target Trypanosoma cruzi glucokinase. Compounds include derivatives of 3-nitro-2-phenyl-2H-chromene, and monosaccharide amines including D-glucosamine, D-mannosamine, D-galactosamine, and D-fructosamine.
The 1,3-dipolar cycloaddition of 2-aryl-3-nitrochromenes with various azomethine ylides has been investigated. The structure and stereochemistry of cycloadducts were studied in detail by NMR spectroscopic methods. (c) 2006 Elsevier Ltd. All rights reserved.