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Mohamed SK, Simpson J, Marzouk AA, Talybov AH, Abdelhamid AA, Abdullayev YA, Abbasov VM. Multicomponent green synthesis, spectroscopic and structural investigation of multi-substituted imidazoles. Part 1. ACTA ACUST UNITED AC 2015. [DOI: 10.1515/znb-2015-0067] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Abstract
Ten 1,2,4,5-tetra-substituted imidazole derivatives have been synthesized with a 2-hydroxyethy substituent at the 1-nitrogen atom and potentially electron releasing hydroxy-, methoxy-, dimethylamino- or nitro substituents in various positions on the benzene ring located on the 2-carbon atom. The prototypical derivative with an unsubstituted phenyl ring at the 2-position is also reported. The compounds are obtained in excellent yields (average 86%) via a four-component cyclocondensation reaction of benzil, ethanolamine, and the appropriate aromatic carbaldehyde together with ammonium acetate. The reaction uses a novel ionic liquid catalyst, DEAHS (diethyl ammonium hydrogen sulfate), under solvent-free conditions and a green synthetic protocol. The key advantages of this process are high yield, shorter reaction times and ease of work-up. Furthermore, the products can be purified by a non-chromatographic method and the catalyst is re-usable. All of these newly synthesized compounds have been characterized from spectral data; the X-ray structures of three representative molecules are also detailed.
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Affiliation(s)
| | - Jim Simpson
- Department of Chemistry, University of Otago, P. O. Box 56, Dunedin, New Zealand
| | - Adel A. Marzouk
- Faculty of Pharmacy, Pharmaceutical Chemistry Department, Al Azhar University, Egypt
| | - Avtandil H. Talybov
- Mamedaliev Institute of Petrochemical Processes, National Academy of Sciences of Azerbaijan, Baku, Azerbaijan
| | - Antar A. Abdelhamid
- Faculty of Science, Department of Chemistry, Sohag University, 82524 Sohag, Egypt
| | | | - Vagif M. Abbasov
- Mamedaliev Institute of Petrochemical Processes, National Academy of Sciences of Azerbaijan, Baku, Azerbaijan
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