Supramolecular Fe₃O₄@PEG/−diaza crown ether@Ni: a novel magnetically reusable nano catalyst for the clean synthesis of 2‐aryl‐2,3‐dihydroquinazolin‐4(1H)‐ones

Abstract

Ni@diaza crown ether complex supported on magnetic nanoparticle was provided by grafting technique. The catalytic activity of Fe3O4@diaza crown ether@Ni was explored through one‐pot synthesis of 2,3‐dihydroquinazolin‐4(1H)‐ones and it was used as an efficient and recoverably constant nanocatalyst. FT‐IR, SEM, TEM, XRD, BET, ICP, EDS, and TGA techniques were employed to specify the nanocatalyst. This heterogeneous catalyst demonstrated acceptable recyclability and could be used again several times with no considerable loss of its catalytic activity.

A novel magnetic layered double hydroxide as potent mesoporous recyclable heterogeneous nanocatalyst for the synthesis of 1H‐chromeno[2,3‐b]pyridine‐3‐carbonitrile derivatives

“…[10] Significant progress has been made in recent years in the development of immobilized macrocyclic compounds like crown ethers on a wide variety of nanomaterials and their application as heterogeneous nanocatalysts possessing important properties such as high surface area, excellent thermal and chemical stabilities, and high selectivity in organic transformations and other industrial processes. [11,12] Over the past few decades, because of life-threatening environmental concerns, the development of environmentally benign supported heterogeneous catalysts with improved efficiency and high selectivity has become an important challenge for scientists. [13] Among the most popular reported heterogeneous catalysts, supported magnetic nanoparticles (MNPs) have received more attention in the organic synthesis in part due to their excellent catalytic performance, high surface area, improved selectivity, easy product separation, and efficient catalyst recyclability.…”

“…[ 10 ] Significant progress has been made in recent years in the development of immobilized macrocyclic compounds like crown ethers on a wide variety of nanomaterials and their application as heterogeneous nanocatalysts possessing important properties such as high surface area, excellent thermal and chemical stabilities, and high selectivity in organic transformations and other industrial processes. [ 11,12 ]…”

A novel magnetic nanocatalyst Fe3O4@PEG–Ni for the green synthesis of 2,3‐dihydroquinazolin‐4(1H)‐ones

“…FT-IR spectrometer measurements were recorded on Nexus 670 apparatus using KBr pellets (Urmia University, Urmia, Iran). Nanostructures were characterized using XRD measurements collected using X'pertpro with wavelength 1.54 Å while some diffraction patterns were entered in the 2θ range (10-80 ) (Lorestan University, [27,29,30] 2 b 20 90 201-203 [29,30,36] 3 c 7 78 229-231 [29,30,37] 4 d 10 92 186-188 [26,29,30] 5 e 10 95 196-198 [27,29,30] 6 f 5 95 191-193 [29,30,37] 7 g 5 95 179-181 [29,30,37] 8 h 45 80 167-169 [26,29,30] 9 i 30 93 208-210 [26,29,30] 10 j 83 188-190 [27,29,30] (Continues) Khorramabad, Iran). The Barrett-Joyner-Halenda method was utilized and the pore volume and pore measure distribution were deduced from the desorption profiles of the isotherms.…”

“…The MNP powder (1.3 g) with of 3-chloropropyltrimethoxysilane (1.5 g) was added to [27,29,30] 12 l 40 93 241-242 [26,29,30] a The products were assigned by comparing their spectral and physical data with reliable samples and the literature.…”

“…[27,28] These heterocyclic compounds are also synthesized by various metal nanocatalysts. [29][30][31] 2,3-Dihydroquinazolin-4(1H)-one derivatives exist that included six-membered heterocyclic ring molecules that have been reported to retain a wide range of biological properties, such as antihistaminic, pharmaceutical, antibiotic, analgesic, antitumor and antibacterial activities. [27,32,33] However, most of these processes suffer from longer reaction time, tedious workup, harsh reaction conditions, unsatisfactory yields, the use of large quantities of environmentally toxic catalysts.…”