Fe3O4/SiO2 nanoparticles: an efficient and magnetically recoverable nanocatalyst for the one-pot multicomponent synthesis of diazepines
作者:Ali Maleki
DOI:10.1016/j.tet.2012.07.034
日期:2012.9
In this research, a new protocol for the one-pot multicomponent synthesis of diazepine derivatives using a 1,2-diamine, a linear or cyclic ketone, and an isocyanide in the presence of a catalytic amount of silica-supported iron oxide (Fe3O4/SiO2) nanoparticles at ambient temperature in excellent yields is described.
Natural wool sulfonic acid (wool-SO3H) and wool-supported Fe3O4 nanoparticles (nano-Fe3O4@wool) with highly loaded Fe3O4 nanoparticles were simply synthesized and characterized by flame atomic absorption spectroscopy, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy. The successful synthesis of 3,4-dihydroquinoxalin-2-amine, 1,6-dihydropyrazine-2,3-dicarbonitrile, (cyanophenylamino)acetamide, tetrahydro-1H-1,5-benzodiazepine-2-carboxamide, and 4,5,6,7-tetrahydro-1H-1,4-diazepine-5-carboxamide derivatives shows that wool-SO3H and Fe3O4@wool nanocomposite have high catalytic activity and can be repetitively used as two biodegradable catalysts.
A Two-Step Synthesis of 1H-Tetrazolyl-1H-1,4-benzonitriles and 1H-Tetrazolyl-benzo[b][1,4]diazepines
title heteroannulated diazepines has been developed. The approach includes a pseudo five-component isocyanide-based condensation reaction between diamines, ketones, isocyanides and trimethylsilyl azide and proceeds in good yields. diazepine - tetrazole - multicomponent reactions - isocyanide
present paper, we report l-ascorbic acid (vitamin C) as an efficient and robust catalyst for the straightforward synthesis of various organic compounds, including carboxamide, benzodiazepine and benzoxazepine derivatives. These compounds with potential drug value which exhibit a broad spectrum biological and pharmacological activities were successfully accessed with vitamin C catalytic system under environmentally