Ultrasonic assisted synergetic green synthesis of polycyclic imidazo(thiazolo)pyrimidines by using Fe3O4@clay core-shell |
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| Affiliation: | 1. Chemistry Department, University of Guilan, P.O. Box 41335-19141, Rasht, Iran;2. Chemistry Department, Izeh Branch, Islamic Azad University, Izeh, Iran;1. Department of Chemistry, University of Delhi, Delhi 110007, India;2. Dyal Singh College, University of Delhi, Lodhi Road, Delhi 110003, India;3. Department of Dairy Microbiology, College of Dairy Science and Technology, Guru Angad Dev Veterinary and Animal Science University, Ludhiana 141004, India;1. Department of Chemistry, University of Jammu, Jammu 180 006, India;2. Green Chemistry Centre of Excellence, Department of Chemistry, University of York, York, UK;3. X-ray Crystallography Laboratory, Department of Physics and Electronics, University of Jammu, Jammu 180 006, India;1. Catalysts and Organic Synthesis Research Laboratory, Department of Chemistry, Iran University of Science and Technology, Tehran 16846-13114, Iran;2. Department of Chemistry, Faculty of Science, Yazd University, Yazd 89195.741, Iran |
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| Abstract: | A practical and green approach for the ultrasound-enhanced one-pot multicomponent synthesis of tetraheterocyclic imidazo(thiazolo)pyrimidines is described via the condensation of an 2-aminobenzimidazole or 2-aminobenzothiazole, dimedone and various aldehydes in the presence of Fe3O4@clay as an environmentally benign and reusable core/shell nanocomposite catalyst in relatively quantitative yields. This novel eco-friendly protocol includes several advantages such as avoiding hazardous solvents, reusability of the catalyst, easy work-up, short reaction times, room temperature and mild reaction conditions. Furthermore, ultrasonic irradiation and synergistic catalyst showed considerable superiority vs. traditional heating or stirring conditions. |
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| Keywords: | Ultrasonic irradiation Heterogeneous nanocatalyst Green chemistry Imidazopyrimidines |
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