chitosan (as a linear polysaccharide) with a coppercomplex to expand the areas of its potential applications is an important scientific task. The present work reports the application of Cu(II)-5-amino-1H-tetrazole complex immobilized on modified magnetic chitosan as an effective catalyst (Fe3O4@Chitosan-Tet-Cu(II)) for C-N bond cross-coupling reaction between 5-aminotetrazole and aryl halides under
用铜络合物对壳聚糖(作为线性多糖)进行功能化以扩大其潜在应用领域是一项重要的科学任务。目前的工作报告了固定在改性磁性壳聚糖上的 Cu(II)-5-amino-1 H-四唑配合物作为CN 键交叉的有效催化剂 (Fe 3 O 4 @Chitosan-Tet-Cu(II)) 的应用。 5-氨基四唑和芳基卤化物在无配体条件下在二恶烷溶剂中的偶联反应。通过FT-IR、EDS、TEM、HRTEM、VSM、FFT、XRD、TG-DTG、ICP-MS和元素映射分析对制备的磁性纳米催化剂进行了表征。1-Aryl-5-amino-1 H-四唑以高产率生产。这种催化过程的优点包括方法简单、避免使用有害催化剂、反应时间短、产率高、易于处理和环境友好。Fe 3 O 4 @Chitosan-Tet-Cu(II) 催化剂即使在连续七次循环后仍表现出高效率和可重复使用性/可回收性,催化活性损失很小。
One-Pot Syntheses of 5-Amino-1-aryltetrazole Derivatives
A novel facile route for the introduction of 5-amino and 5-alkylamino substituents into 1-aryltetrazoles has been developed. A range of 5-amino-1-aryltetrazoles was obtained directly from the corresponding 1-aryltetrazoles in one pot by consecutive ring-opening, azidation and intramolecular cyclization. 5-Alkylamino-1-aryltetrazoles were formed by a similar mechanism from 1,4-disubstituted tetrazolium salts. An influence of the nature of aryl substituents and reaction conditions on the regioselectivity of the intramolecular cyclization of intermediate guanyl azides is revealed.
Controlling Pd-Catalyzed N-Arylation and Dimroth Rearrangement in the Synthesis of <i>N</i>,1-Diaryl-1<i>H</i>-tetrazol-5-amines
作者:Andrea M. Nikolić、Jelena Stanić、Matija Zlatar、Maja Gruden、Boban And̵elković、Života Selaković、Vladimir Ajdačić、Igor M. Opsenica
DOI:10.1021/acs.joc.1c00282
日期:2021.3.19
thermodynamic stability of the compounds. It was established that the Dimroth rearrangement is thermodynamically controlled, and the equilibrium of the reaction is determined by the stability of the corresponding isomers. The mechanism was investigated by additional DFT calculations, and the opening of the tetrazole ring was shown to be the rate-determining step. By maneuvering Pd-catalyzed N-arylation and the
Adamantylazoles: XIV. Acid-catalyzed alkylation of 5-aminotetrazoles with tertiary alcohols
作者:A. V. Logvinov、I. N. Polyakova、E. L. Golod
DOI:10.1134/s1070363210110228
日期:2010.11
Alkylation of 5-aminotetrazole with tert-butyl alcohol or adamantan-1-ol in sulfuric acid gave a mixture of isomeric N 1- and N 2-alkyl derivatives, as well as 1,3-dialkyl-5-aminotetrazolium salt. Adamantylation of 1-substituted 5-aminotetrazoles led to the formation of mixtures of 1,3- and 1,4-disubstituted 5-aminotetrazolium salts which can be converted into the corresponding free bases.
Solvent-free preparation of arylaminotetrazole derivatives using aluminum(III) hydrogensulfate as an effective catalyst
作者:Ferydoon Khamooshi、Ali Reza Modarresi-Alam
DOI:10.1016/j.cclet.2010.03.008
日期:2010.8
Abstract An efficient and simple method for the preparation of 5-arylamino-1H-tetrazole and 1-aryl-5-amino-1H-tetrazole derivatives is reported using aluminum(III) hydrogensulfate (Al(HSO4)3) as an effective heterogeneous catalyst from secondary arylcyanamides. Generally, when the substitution in arylcyanamide is strongly electron-withdrawing the position of equilibrium would shift toward the isomer