Open AccessH 4 [W 12 SiO 40 ] grafted on magnetic chitosan: a green nanocatalyst for the synthesis of [1,2,4]triazolo/benzimidazolo quinazolinone derivatives
Author(s) -
Ayati Ali,
Daraie Mansoureh,
Heravi Majid M.,
Tanhaei Bahareh
Publication year - 2017
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2017.0053
Subject(s) - catalysis , quinazolinone , scanning electron microscope , nuclear chemistry , fourier transform infrared spectroscopy , yield (engineering) , spectroscopy , chemistry , chitosan , infrared spectroscopy , materials science , organic chemistry , chemical engineering , physics , quantum mechanics , engineering , metallurgy , composite material
A novel nanocomposite, H 4 SiW 12 O 40 immobilised magnetic chitosan (HSiW‐MC) was prepared via a facile procedure in one‐pot fashion. This composite was fully characterised using several methods including, Fourier transform infrared spectroscopy, X‐ray diffraction, energy‐dispersive X‐ray spectroscopy and scanning electron microscopy. It was applied as a novel catalyst in two three components reaction involving, dimedone, differently substituted aryl aldehydes and either 3‐amino‐1,2,4‐triazole or 2‐amino benzimidazole to afford the corresponding [1,2,4]triazolo/benzimidazolo quinazolinone derivatives. It showed excellent performance in the aforementioned reaction with the high yield of 96%. Also, the effect of HSiW‐MC amount, catalysts, solvents and temperatures were studied and the best results were obtained in CH 3 CN in the presence of HSiW‐MC (0.04 g) under refluxing conditions.