Development of benzothiazole ‘click-on’ fluorogenic dyes
作者:Jianjun Qi、Ching-Hsuan Tung
DOI:10.1016/j.bmcl.2010.11.009
日期:2011.1
'Click-on' fluorogenic reaction: a non-fluorescent benzothiazole with an electron-deficient alkyne group at 2-position reacts with azide containing molecules could form fluorescent adducts. (C) 2010 Elsevier Ltd. All rights reserved.
Triazolbenzo[d]thiazoles: Efficient synthesis and biological evaluation as neuroprotective agents
作者:Belem Avila、Aaron Roth、Heather Streets、Donard S. Dwyer、Mark J. Kurth
DOI:10.1016/j.bmcl.2012.07.022
日期:2012.9
A number of (1H-1,2,3-triazol-1-yl)benzo[d]thiazoles were synthesized utilizing a versatile Cu-catalyzed azide–alkyne click reaction (CuAAC) on tautomeric benzo[4,5]thiazolo[3,2-d]tetrazole (1) and 2-azidobenzo[d]thiazole (2) starting materials. Moreover, one of the resulting products of this investigation, triazolbenzo[d]thiazole 22, was found to possess significant neuroprotective activity in human
利用互变异构苯并[4,5]噻唑啉上的多功能铜催化叠氮化物-炔点击反应(CuAAC)合成了许多(1 H -1,2,3-三唑-1-基)苯并[ d ]噻唑。 3,2- d ]四唑( 1 )和2-叠氮基苯并[ d ]噻唑( 2 )起始材料。此外,本研究的产物之一三唑苯并[ d ]噻唑22被发现对人神经母细胞瘤 (SH-SY5Y) 细胞具有显着的神经保护活性。
On the utility of the azido transfer protocol: synthesis of 2- and 5-azido N-methylimidazoles, 1,3-thiazoles and N-methylpyrazole and their conversion to triazole–azole bisheteroaryls
作者:Paolo Zanirato、Stefano Cerini
DOI:10.1039/b500634a
日期:——
The azido transfer procedure of heteroaryllithium and tosyl azide was used to synthesize selected 2- and 5-azidoazoles. This procedure, which is based on the fragmentation of the appropriate lithium triazene salts 1aâ7a, successfully afforded 2-azido-N-methylimidazole 1, 2-azido-1,3-thiazole 2, 2-azidobenzo-1,3-thiazole 3, 5-azido-N-methylpyrazole 4, 5-azido-N-methylimidazole 6 [via 2-(trimethylsilyl)-5-azido-N-methylimidazole 5], and 5-azido-1,3-thiazole 7 (via 5-lithio-1,3-thiazole), but attempts to prepare 5-azido-2-(trimethylsilyl)-1,3-thiazole 8 from the corresponding triazene 7a failed, affording only the desilylated azide 7 in poor yield. Azides 1â7 underwent 1,3-dipolar cycloaddition when mixed with neat (trimethylsilyl)acetylene, giving 1-heteroaryl-4-trimethylsilyl-1,2,3-triazoles 1bâ7b generally in very high yields.
intermolecular benzylic C(sp3)–H amination is developed utilizing 1,2,3,4-tetrazole as a nitrene precursor via iron catalysis. This method enables direct installation of 2-aminopyridine into the benzylic and heterobenzylic position. The methodselectively aminates 2° benzylic C(sp3)–H bond over the 3° and 1° benzylic C(sp3)–H bonds. Experimental studies reveal that the C(sp3)–H amination undergoes via the formation
Iron-Catalyzed Intermolecular C–N Cross-Coupling Reactions via Radical Activation Mechanism
作者:Subrata Das、Andreas W. Ehlers、Sima Patra、Bas de Bruin、Buddhadeb Chattopadhyay
DOI:10.1021/jacs.3c05627
日期:2023.7.12
aromatic and aliphatic azides with boronic acids under iron-catalyzed conditions. The amination follows an unprecedented metalloradical activation mechanism that is different from traditional metal-catalyzed C–N cross-coupling reactions. The scope of the reaction has been demonstrated by the employment of a large number of tetrazoles, azides, and boronic acids. Moreover, several late-stage aminations