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Castro JAM, Serikava BK, Maior CRS, Naciuk FF, Rocco SA, Ligiéro CBP, Morgon NH, Miranda PCML. Regioselection Switch in Nucleophilic Addition to Isoquinolinequinones: Mechanism and Origin of the Regioselectivity in the Total Synthesis of Ellipticine. J Org Chem 2022; 87:7610-7617. [PMID: 35171607 DOI: 10.1021/acs.joc.1c02952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ellipticine was synthesized in six steps and 20% global yield starting from the readily available 2,5-dimethoxy isoquinoline. Unprecedented regioselective control of the nucleophilic attack on the isoquinoline-5,8-dione is first described. Investigation of the possible pathways of this transformation through density functional theory calculations reveals unexpected N-oxide assistance in cascade tautomerizations, which was crucial for directing the nucleophilic attack and hastening the overall process. Using this strategy, we prepared the aniline-isoquinolinedione adduct and submitted it to an intramolecular double C-H cross-coupling activation to furnish ellipticinequinone, which gave ellipticine after a MeLi addition/BH3 reduction sequence.
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Affiliation(s)
- Joaquim A M Castro
- Institute of Chemistry, University of Campinas-UNICAMP, P.O. Box 6154, Campinas, SP 13083 970, Brazil
| | - Bruno K Serikava
- Institute of Chemistry, University of Campinas-UNICAMP, P.O. Box 6154, Campinas, SP 13083 970, Brazil
| | - Christian R S Maior
- Institute of Chemistry, University of Campinas-UNICAMP, P.O. Box 6154, Campinas, SP 13083 970, Brazil
| | - Fabrício F Naciuk
- Brazilian Biosciences National Laboratory, Brazilian Center for Research in Energy and Materials, Campinas, SP 13083-970, Brazil
| | - Silvana A Rocco
- Brazilian Biosciences National Laboratory, Brazilian Center for Research in Energy and Materials, Campinas, SP 13083-970, Brazil
| | - Carolina B P Ligiéro
- Institute of Chemistry, University of Campinas-UNICAMP, P.O. Box 6154, Campinas, SP 13083 970, Brazil
| | - Nelson H Morgon
- Institute of Chemistry, University of Campinas-UNICAMP, P.O. Box 6154, Campinas, SP 13083 970, Brazil
| | - Paulo C M L Miranda
- Institute of Chemistry, University of Campinas-UNICAMP, P.O. Box 6154, Campinas, SP 13083 970, Brazil
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2
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Keshavarz F. Molecular level insights into the direct health impacts of some organic aerosol components. NEW J CHEM 2021. [DOI: 10.1039/d1nj00231g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Quantum chemistry and biomodeling indicate that the studied organic aerosol components cannot directly cause oxidative stress or mutagenicity/carcinogenicity.
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Affiliation(s)
- Fatemeh Keshavarz
- Institute for Atmospheric and Earth System Research
- Faculty of Science
- University of Helsinki
- FI-00014 Helsinki
- Finland
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Bai N, Wang W, Zhao Y, Feng W, Li P. Theoretical Insights into the Reaction Mechanism between 2,3,7,8-Tetrachlorodibenzofuran and Hydrogen Peroxide: A DFT Study. ACS OMEGA 2019; 4:358-367. [PMID: 31459335 PMCID: PMC6648065 DOI: 10.1021/acsomega.8b00724] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Accepted: 07/19/2018] [Indexed: 06/10/2023]
Abstract
A detailed knowledge of the reactivity of 2,3,7,8-tetrachlorodibenzofuran (TCDF) at the molecular level is important to better understand the transformation of dioxins analogous to TCDF in the environment. To clarify the reactivity of the organic hydroperoxides toward TCDF, the reaction of the TCDF with hydrogen peroxide (H2O2) and its anion has been investigated theoretically. For the reaction of the neutral H2O2, a molecular complex can be formed between TCDF and H2O2 first. Then, the nucleophilic aromatic substitution of TCDF by H2O2 occurs in the presence of the water molecules to form an intermediate containing an O-O bond. Finally, the O-O bond cleavages homolytically for the above intermediate. On the other hand, as for the reaction of the anion of H2O2 (HO2 -), the nucleophilic addition of HO2 - to TCDF can also occur besides the nucleophilic aromatic substitution reaction mentioned above, resulting in the dissociation of the C-O bond of TCDF. Unlike the reaction involving neutral H2O2, no water molecules are required. In addition, the selected substitution effects, such as F-, Br-, and CH3-substituents, on the reactivity of the above reaction have also been explored. Hopefully, the present results can enable us to gain insights into the reactivity of the organic hydroperoxides with TCDF-like environmental pollutants.
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Affiliation(s)
- Nana Bai
- Key Laboratory of Life-Organic
Analysis, School of Chemistry and Chemical Engineering, Qufu Normal University, No. 57 Jingxuan West Road, Qufu 273165, P. R. China
| | - Weihua Wang
- Key Laboratory of Life-Organic
Analysis, School of Chemistry and Chemical Engineering, Qufu Normal University, No. 57 Jingxuan West Road, Qufu 273165, P. R. China
| | - Yun Zhao
- Key Laboratory of Life-Organic
Analysis, School of Chemistry and Chemical Engineering, Qufu Normal University, No. 57 Jingxuan West Road, Qufu 273165, P. R. China
| | - Wenling Feng
- Key Laboratory of Life-Organic
Analysis, School of Chemistry and Chemical Engineering, Qufu Normal University, No. 57 Jingxuan West Road, Qufu 273165, P. R. China
| | - Ping Li
- Key Laboratory of Life-Organic
Analysis, School of Chemistry and Chemical Engineering, Qufu Normal University, No. 57 Jingxuan West Road, Qufu 273165, P. R. China
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4
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Wang W, Wang Y, Feng W, Wang W, Li P. Theoretical Investigations on the Reactivity of Hydrogen Peroxide toward 2,3,7,8-Tetrachlorodibenzo- p-dioxin. Molecules 2018; 23:E2826. [PMID: 30384440 PMCID: PMC6278397 DOI: 10.3390/molecules23112826] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 10/26/2018] [Accepted: 10/27/2018] [Indexed: 11/16/2022] Open
Abstract
Acquiring full knowledge of the reactivity of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is crucial for the better understanding of the transformation and degradation of TCDD-like dioxins in the environment. To clarify the reactivity of the organic hydroperoxides toward TCDD, in this study, the reactions between the neutral/anion of the hydrogen peroxide (H₂O₂) and TCDD have been systematically investigated theoretically. It was found that the neutral H₂O₂ is relatively difficult to react with TCDD compared with its anion, exhibiting the pH dependence of the title reaction. As for the anion of H₂O₂, it reacts with TCDD through two reaction mechanisms, i.e., nucleophilic substitution and nucleophilic addition. For the former, the terminal O atom of HO₂- nucleophilically attacks the C atom of the C-Cl bond in TCDD to form an intermediate containing an O-O bond, accompanying the dissociation of the chlorine atom. For the latter, the terminal O atom of HO₂- can be easily attached to the C atom of the C-O bond in TCDD, resulting in the decomposition of C-O bond and the formation of an intermediate containing an O-O bond. For these formed intermediates in both reaction mechanisms, their O-O bonds can be homolytically cleaved to produce different radicals. In addition, the selected substitution effects including F-, Br-, and CH₃- substituents on the above reactions have also been studied. Hopefully, the present results can provide new insights into the reactivity of the organic hydroperoxides toward TCDD-like environmental pollutants.
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Affiliation(s)
- Weihua Wang
- Key Laboratory of Life-Organic Analysis, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Yuhua Wang
- Key Laboratory of Life-Organic Analysis, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Wenling Feng
- Key Laboratory of Life-Organic Analysis, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Wenliang Wang
- Key Laboratory of Life-Organic Analysis, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Ping Li
- Key Laboratory of Life-Organic Analysis, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China.
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Zhao Y, Wang W, Feng W, Wang W, Li P. Theoretical Insights into the Interaction Mechanisms between Nitric Acid and Nitrous Oxide Initiated by an Excess Electron. J Phys Chem A 2018; 122:7312-7319. [PMID: 30203973 DOI: 10.1021/acs.jpca.8b04775] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Nitric acid (HNO3) and nitrous oxide (N2O) play an important role in the atmospheric chemistry in regulating the global environment and climate changes. In this study, the interaction mechanisms between them have been systematically investigated before and after the electron capture employing the density functional theory in combination with the AIM, NBO, and ab initio molecular dynamics calculations. It was found that HNO3 and N2O can form transient complexes through intermolecular H-bonds. HNNO, OH, and NO2 free radicals can be produced after the electron capture of the formed complexes, providing an alternative source of these radicals in the atmosphere. The present results not only can provide new insights into the transformation of the HNO3 and N2O atmospheric species but also can enable us to better understand the potential role of the free electron in the atmosphere.
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Affiliation(s)
- Yun Zhao
- Key Laboratory of Life-Organic Analysis, School of Chemistry and Chemical Engineering , Qufu Normal University , Qufu 273165 , P. R. China
| | - Weihua Wang
- Key Laboratory of Life-Organic Analysis, School of Chemistry and Chemical Engineering , Qufu Normal University , Qufu 273165 , P. R. China
| | - Wenling Feng
- Key Laboratory of Life-Organic Analysis, School of Chemistry and Chemical Engineering , Qufu Normal University , Qufu 273165 , P. R. China
| | - Wenliang Wang
- Key Laboratory of Life-Organic Analysis, School of Chemistry and Chemical Engineering , Qufu Normal University , Qufu 273165 , P. R. China
| | - Ping Li
- Key Laboratory of Life-Organic Analysis, School of Chemistry and Chemical Engineering , Qufu Normal University , Qufu 273165 , P. R. China
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Theoretical Insights into the Electron Capture Behavior of H₂SO₄···N₂O Complex: A DFT and Molecular Dynamics Study. Molecules 2018; 23:molecules23092349. [PMID: 30217087 PMCID: PMC6225230 DOI: 10.3390/molecules23092349] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 09/04/2018] [Accepted: 09/05/2018] [Indexed: 11/16/2022] Open
Abstract
Both sulfuric acid (H2SO4) and nitrous oxide (N2O) play a central role in the atmospheric chemistry in regulating the global environment and climate changes. In this study, the interaction behavior between H2SO4 and N2O before and after electron capture has been explored using the density functional theory (DFT) method as well as molecular dynamics simulation. The intermolecular interactions have been characterized by atoms in molecules (AIM), natural bond orbital (NBO), and reduced density gradient (RDG) analyses, respectively. It was found that H2SO4 and N2O can form two transient molecular complexes via intermolecular H-bonds within a certain timescale. However, two molecular complexes can be transformed into OH radical, N2, and HSO4− species upon electron capture, providing an alternative formation source of OH radical in the atmosphere. Expectedly, the present findings not only can provide new insights into the transformation behavior of H2SO4 and N2O, but also can enable us to better understand the potential role of the free electron in driving the proceeding of the relevant reactions in the atmosphere.
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Wang W, Guo C, Feng W, Sun Q, Li P. Theoretical insights into the reaction mechanism between tetrachloro-o-benzoquinone and N-methyl benzohydroxamic acid. RSC Adv 2017. [DOI: 10.1039/c7ra05083f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The reaction mechanism between tetrachloro-o-benzoquinone and N-methyl benzohydroxamic acid has been clarified theoretically.
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Affiliation(s)
- Weihua Wang
- Key Laboratory of Life-Organic Analysis
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu
- P. R. China
| | - Chao Guo
- Key Laboratory of Life-Organic Analysis
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu
- P. R. China
| | - Wenling Feng
- Key Laboratory of Life-Organic Analysis
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu
- P. R. China
| | - Qiao Sun
- Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions
- School for Radiological and Interdisciplinary Sciences
- Soochow University
- Suzhou
- P. R. China
| | - Ping Li
- Key Laboratory of Life-Organic Analysis
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu
- P. R. China
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