39889-78-6Relevant articles and documents
Functionalization of chitosan by grafting Cu(II)-5-amino-1H-tetrazole complex as a magnetically recyclable catalyst for C-N coupling reaction
Motahharifar, Narjes,Naserimanesh, Alireza,Nasrollahzadeh, Mahmoud,Sajjadi, Mohaddeseh,Shokouhimehr, Mohammadreza
, (2021/12/27)
The functionalization of chitosan (as a linear polysaccharide) with a copper complex 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 ligand-free conditions in dioxane solvent. The prepared magnetic nanocatalyst was characterized by FT-IR, EDS, TEM, HRTEM, VSM, FFT, XRD, TG-DTG, ICP-MS, and elemental mapping analyses. 1-Aryl-5-amino-1H-tetrazoles were produced in high yields. The advantages of this catalytic process include simple methodology, avoiding the use of harmful catalysts, short reaction times, excellent yields, easy work-up, and environmentally friendly conditions. Fe3O4@Chitosan-Tet-Cu(II) catalyst exhibited high efficacy and reusability/recyclability even after seven consecutive cycles with low loss of catalytic activity.
Iron-promoted sulfur sequestration for the substituent-dependent regioselective synthesis of tetrazoles and guanidines
Pendem, Venkata Bhavanarushi,Tamminana, Ramana,Nannapaneni, Madhavi
, p. 499 - 509 (2021/04/09)
We have established a facile and versatile synthetic methodology for the construction of tetrazoles and guanidines in the presence of an eco-friendly, inexpensive, easily available iron reagent. Aromatic thioureas with electron-donating substituents produced their respective target products in quantitative yield. In contrast, when electron-withdrawing substituted aromatic thioureas were used, the expected products were obtained in reduced yield. However, the desired products were obtained in good yield at moderate temperature. In addition, mechanistic studies revealed that the synthetic route involved iron-based subsequent reactions of addition and removal of sulfur.
Chitosan supported 1-phenyl-1H-tetrazole-5-thiol ionic liquid copper(II) complex as an efficient catalyst for the synthesis of arylaminotetrazoles
Nasrollahzadeh, Mahmoud,Motahharifar, Narjes,Nezafat, Zahra,Shokouhimehr, Mohammadreza
, (2021/09/13)
A recyclable functional hybrid catalyst was prepared via a simple method using chitosan as a linear polysaccharide and an ionic liquid. In this work, the synthesis of chitosan supported 1-phenyl-1H-tetrazole-5-thiol ionic liquid copper(II) complex (CS@Tet
