Building Heterocyclic Systems with RC(OR)2+ Carbocations in Recyclable Brønsted Acidic Ionic Liquids: Facile Synthesis of 1-Substituted 1H-1,2,3,4-Tetrazoles, Benzazoles and Other Ring Systems with CH(OEt)3 and EtC(OEt)3 in [EtNH3][NO3] and [PMIM(SO3H)][O
作者:Gopalakrishnan Aridoss、Kenneth K. Laali
DOI:10.1002/ejoc.201100128
日期:2011.5
IL-1/CH(OEt) 3 . The latter was also formed from 2-aminobenzoic acid in IL-1/CH(OEt) 3 . Mechanistic implications are addressed. The reported protocols enable rapid assembly of a host of heterocyclic systems in high yields with the added advantage of recycling and reuse of the ILs.
1-(Furan-2-ylmethyl)-1<i>H</i>-tetrazole and its Copper(II) Complexes
作者:Tatyana N. Andreeva、Alexander S. Lyakhov、Ludmila S. Ivashkevich、Sergei V. Voitekhovich、Yuri V. Grigoriev、Oleg A. Ivashkevich
DOI:10.1002/zaac.201500550
日期:2015.10
1-(Furan-2-ylmethyl)-1H-tetrazole (fmt), prepared by heterocyclization of furfurylamine with triethyl orthoformate and sodium azide, was found to react with copper(II) perchlorate, nitrate, and bromide giving complexes [Cu(fmt)4(H2O)2](ClO4)2, [Cu(fmt)3(NO3)2(H2O)], and [Cu2(fmt)4Br4], respectively. The obtained crystalline complexes and fmt were characterized by X-ray diffraction, thermal analyses
Green Synthesis of 5-Substituted-1H-1,2,3,4-tetrazoles and 1-Sustituted-1H-1,2,3,4-tetrazoles via [3+2] Cycloaddition by Reusable Immobilized AlCl3 on γ-Al2O3
We report the effectiveness of the surface modified gamma-Al2O3 which is reusable, efficient, catalytic, safe and environmentally acceptable procedure for the conversion of both alkyl and aryl nitriles into the corresponding 5-substituted-1H-1,2,3,4-tetrazoles via [3+2] cycloaddition with sodium azide in excellent yields at mild reaction conditions (50 degrees C). The catalyst also afforded 1-substituted-1H-1,2,3,4-tetrazoles by the reaction of amines, sodium azide and triethyl orthoformate. The catalyst could be recycled and was reused eleven runs without losing its activity.
Indium triflate-catalyzed one-pot synthesis of 1-substituted-1H-1,2,3,4-tetrazoles under solvent-free conditions
作者:Dhiman Kundu、Adinath Majee、Alakananda Hajra
DOI:10.1016/j.tetlet.2009.03.131
日期:2009.6
A simple, efficient, and general method has been developed for the synthesis of 1-substituted-1H-1,2,3,4-tetrazoles via a three-component condensation of amine, trimethyl orthoformate, and sodium azide in presence of a catalytic amount of indium triflate under solvent-free conditions. The reaction proceeds smoothly to generate the corresponding 1-substituted tetrazoles in moderate to excellent yields under heating. (C) 2009 Elsevier Ltd. All rights reserved.