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1
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Insights into the mechanism and stereoselectivity of the [3+2] cycloaddition reaction between N-methyl-C-(4-hydroxylphenyl) nitrone and maleic anhydride with a molecular electron density theory perspective. Theor Chem Acc 2022. [DOI: 10.1007/s00214-022-02891-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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2
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Elucidation of the molecular mechanisms of 1,2,3,5- and 1,2,4,5-tetrazines with strained and electron-rich alkynes. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132860] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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3
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Wang B, Constantin MG, Singh S, Zhou Y, Davis RL, West FG. Generation and trapping of electron-deficient 1,2-cyclohexadienes. Unexpected hetero-Diels-Alder reactivity. Org Biomol Chem 2021; 19:399-405. [PMID: 33300539 DOI: 10.1039/d0ob02285c] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Keto-substituted 1,2-cyclohexadienes were generated by base-mediated (KOt-Bu) elimination, and found to dimerize via an unprecedented formal hetero-Diels-Alder process, followed by hydration. These highly reactive cyclic allene intermediates were also trapped in Diels-Alder reactions by furan, 2,5-dimethylfuran, or diphenylisobenzofuran to afford cycloadducts with high regio- and diastereoselectivity, and could also be intercepted in a hetero-Diels-Alder process with enamine dienophiles. Endo/exo stereochemistry was unambiguously determined via X-ray crystallography in the case of nitrile-substituted 1,2-cyclohexadiene. DFT calculations indicate that the novel hetero-Diels-Alder processes observed with these allenes occur via a concerted asynchronous cycloaddition mechanism.
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Affiliation(s)
- Baolei Wang
- Department of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry Centre, Edmonton, AB, Canada T6G 2G2. and State-Key Laboratory of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Marius-Georgian Constantin
- Department of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry Centre, Edmonton, AB, Canada T6G 2G2.
| | - Simarpreet Singh
- Department of Chemistry, University of Manitoba, 360 Parker Bldg., 144 Dysart Rd., Winnipeg, MN, Canada R3T 2N2
| | - Yuqiao Zhou
- Department of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry Centre, Edmonton, AB, Canada T6G 2G2.
| | - Rebecca L Davis
- Department of Chemistry, University of Manitoba, 360 Parker Bldg., 144 Dysart Rd., Winnipeg, MN, Canada R3T 2N2
| | - F G West
- Department of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry Centre, Edmonton, AB, Canada T6G 2G2.
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El Ghozlani M, Barhoumi A, Elkacmi R, Ouled Aitouna A, Zeroual A, El Idrissi M. Mechanistic Study of Hetero-Diels–Alder [4 + 2] Cycloaddition Reactions Between 2-Nitro-1H-Pyrrole and Isoprene. CHEMISTRY AFRICA 2020. [DOI: 10.1007/s42250-020-00187-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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5
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Rhyman L, Ríos-Gutiérrez M, Domingo LR, Ramasami P. Unveiling the high reactivity of benzyne in the formal [3+2] cycloaddition reactions towards thioamides through the Molecular Electron Density Theory. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131458] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Domingo LR, Acharjee N. Unveiling the high reactivity of strained dibenzocyclooctyne in [3 + 2] cycloaddition reactions with diazoalkanes through the molecular electron density theory. J PHYS ORG CHEM 2020. [DOI: 10.1002/poc.4100] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Luis R. Domingo
- Department of Organic Chemistry University of Valencia Burjassot Valencia Spain
| | - Nivedita Acharjee
- Department of Chemistry Durgapur Government College Durgapur West Bengal India
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Domingo LR, Acharjee N. Unravelling the strain-promoted [3+2] cycloaddition reactions of phenyl azide with cycloalkynes from the molecular electron density theory perspective. NEW J CHEM 2020. [DOI: 10.1039/d0nj02711a] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The increase of the strain not only increases the reaction rate and the exothermic character of these reactions, but also changes the mechanism for the small cycloalkynes from a non-polar to a polar reaction.
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Affiliation(s)
- Luis R. Domingo
- Department of Organic Chemistry
- University of Valencia
- E-46100 Valencia
- Spain
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