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Uvarova ES, Kutasevich AV, Lipatov ES, Pytskii IS, Raitman OA, Selivantev YM, Mityanov VS. Three-component cascade reaction of 3-ketonitriles, 2-unsubstituted imidazole N-oxides, and aldehydes. Org Biomol Chem 2024; 22:4297-4308. [PMID: 38717323 DOI: 10.1039/d4ob00353e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
A three-component condensation of 2-unsubstituted imidazole N-oxides, 3-ketonitriles, and aldehydes is described. The reaction proceeds via sequential Knoevenagel condensation/Michael addition under mild, catalyst-free conditions with various substrates. Furthermore, the corresponding 2-functionalized imidazole N-oxides can be further dehydrated to (Z)-2-aroyl-3-(1H-imidazol-2-yl)-acrylonitriles, which may also be directly prepared by changing the reaction conditions as a cascade of Knoevenagel condensation/Michael addition/dehydration.
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Affiliation(s)
- Ekaterina S Uvarova
- Mendeleev University of Chemical Technology, Miusskaya Sq., 9, Moscow 125047, Russian Federation.
| | - Anton V Kutasevich
- Mendeleev University of Chemical Technology, Miusskaya Sq., 9, Moscow 125047, Russian Federation.
| | - Egor S Lipatov
- A.N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences, Vavilov str. 28/1, 119334 Moscow, Russian Federation
- Higher Chemical College of Russian Academy of Sciences, D.I. Mendeleev University of Chemical Technology of Russia, Miusskaya pl. 9, 125047, Moscow, Russian Federation
| | - Ivan S Pytskii
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Academy of Sciences, Leninsky Prospect 31 bldg. 4, 119071 Moscow, Russian Federation
| | - Oleg A Raitman
- Mendeleev University of Chemical Technology, Miusskaya Sq., 9, Moscow 125047, Russian Federation.
| | - Yuriy M Selivantev
- Mendeleev University of Chemical Technology, Miusskaya Sq., 9, Moscow 125047, Russian Federation.
| | - Vitaly S Mityanov
- Mendeleev University of Chemical Technology, Miusskaya Sq., 9, Moscow 125047, Russian Federation.
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Uvarova ES, Kutasevich AV, Lipatov ES, Mityanov VS. Assembly of isoxazol-5-one with 2-unsubstituted imidazole N-oxides and aldehydes. Org Biomol Chem 2023; 21:651-659. [PMID: 36562428 DOI: 10.1039/d2ob02157a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A new synthetic protocol has been developed to construct polyfunctional isoxazol-5-one derivatives with imidazole moiety. It is based on the Knoevenagel condensation of isoxazol-5-one with aldehydes and subsequent Michael addition of imidazole N-oxides as part of a tandem three-component process. This reaction proceeds smoothly in moderate-to-good yield under catalyst-free conditions.
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Affiliation(s)
- Ekaterina S Uvarova
- Department of Fine Organic Synthesis and Chemistry of Dyes, Mendeleev University of Chemical Technology, Miusskaya Sq., 9, Moscow 125047, Russian Federation.
| | - Anton V Kutasevich
- Department of Fine Organic Synthesis and Chemistry of Dyes, Mendeleev University of Chemical Technology, Miusskaya Sq., 9, Moscow 125047, Russian Federation.
| | - Egor S Lipatov
- A.N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences, Vavilov Str. 28/1, 119334 Moscow, Russian Federation.,Higher Chemical College of Russian Academy of Sciences, D.I. Mendeleev University of Chemical Technology of Russia, Miusskaya pl. 9, 125047, Moscow, Russian Federation
| | - Vitaly S Mityanov
- Department of Fine Organic Synthesis and Chemistry of Dyes, Mendeleev University of Chemical Technology, Miusskaya Sq., 9, Moscow 125047, Russian Federation.
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Synthesis and Selected Transformations of 2-Unsubstituted Imidazole N-Oxides Using a Ball-Milling Mechanochemical Approach. Catalysts 2022. [DOI: 10.3390/catal12060589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Synthetically relevant 2-unsubstituted imidazole N-oxides were obtained by using the ball-milling mechanochemical method. The presented approach extended the scope of the known method and enabled the preparation of hitherto little known N(1)-aryl-substituted derivatives, which are of interest as starting materials for the synthesis of more complex imidazole-based organic materials, generally in good to excellent yields. In addition, selected one-pot mechanochemical transformations including N- and O-alkylations as well as sulfur transfer reactions based on either (3+2)-cycloaddition reaction with 2,2,4,4-tetramethylcyclobutane-1,3-dithione or sulfurization of the transient imidazol-2-ylidenes, generated from corresponding imidazolium salts, were studied. The reported results can be considered as a continuation of long-term studies focused on the synthesis and applications of 2-unsubstituted imidazole N-oxides.
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