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Kim R, Wu Y, Tong R. Asymmetric total syntheses of sarglamides A, C, D, E, and F. Chem Sci 2024; 15:12856-12860. [PMID: 39148793 PMCID: PMC11322964 DOI: 10.1039/d4sc03553d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Accepted: 07/08/2024] [Indexed: 08/17/2024] Open
Abstract
Sarglamides A-E were identified as a structurally new class of alkaloids with potential application for inflammation-associated diseases. Reported is the first asymmetric total synthesis of sarglamides A, C, D, E, and F within 7 steps, featuring an intermolecular Diels-Alder cycloaddition of (S)-phellandrene and 1,4-benzoquinone and intramolecular (aza-)Michael addition to construct the tetracyclic core of sarglamides. Importantly, our work demonstrated that the hypothetic Diels-Alder reaction of α-phellandrene with dienophile toussaintine C (or analogues) originally proposed as a biosynthetic pathway was not viable under non-enzymatic conditions. Additionally, we discovered novel and efficient double cyclization (cycloetherification and oxa-Michael cyclization) to construct the core framework of sarglamides E and D. Our concise synthetic strategy might allow rapid access to a library of sarglamide analogues for further evaluation of their bioactivity and mode of action.
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Affiliation(s)
- Ryungwoo Kim
- Department of Chemistry, The Hong Kong University of Science and Technology Clearwater Bay Kowloon Hong Kong China +86 23581594 +86 23587357
| | - Yanting Wu
- Department of Chemistry, The Hong Kong University of Science and Technology Clearwater Bay Kowloon Hong Kong China +86 23581594 +86 23587357
| | - Rongbiao Tong
- Department of Chemistry, The Hong Kong University of Science and Technology Clearwater Bay Kowloon Hong Kong China +86 23581594 +86 23587357
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Chen ML, Chou CW, Zhu JL, Tsai MH. Access to cyclohexadiene and benzofuran derivatives via catalytic arene cyclopropanation of α-cyanodiazocarbonyl compounds. Org Biomol Chem 2024; 22:5552-5560. [PMID: 38904217 DOI: 10.1039/d4ob00696h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/22/2024]
Abstract
The arene cyclopropanation between diazo compounds and benzene is well known to produce a tautomeric mixture of norcaradiene and cycloheptatriene in favour of the latter species. Nevertheless, previous studies have suggested that the initially formed norcaradiene can be stabilized by a C-7 cyano group with prevention of its 6π-electrocyclic ring opening. According to this feature, a synthetic route to functionalized cyclohexadienes has been designed using α-cyanodiazoacetates and α-diazo-β-ketonitriles as the starting materials, respectively. The Rh2(esp)2-catalyzed arene cyclopropanation of α-cyanodiazoacetates in benzene afforded the expected 7-alkoxycarbonyl-7-cyanonorcaradienes as isolable compounds, which then served as templates for the second cyclopropanation with ethyl diazoacetate or α-cyanodiazocarbonyls to enable the formation of bis(cyclopropanated) adducts. Their subsequent treatment with SmI2 triggered a double ring-opening process, allowing for the generation of 1,4- and/or 1,3-cyclohexadienes as either regio- or diastereomeric mixtures. On the other hand, the norcaradienes generated from phenyl- or methyl-substituted α-diazo-β-ketonitriles were found to undergo an in situ rearrangement to yield dihydrobenzofurans that could be converted to benzofuran derivatives by DDQ oxidation.
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Affiliation(s)
- Mei-Lin Chen
- Department of Chemistry, National Dong Hwa University, Hualien 97401, Taiwan, R.O.C..
| | - Chi-Wen Chou
- Department of Chemistry, National Dong Hwa University, Hualien 97401, Taiwan, R.O.C..
| | - Jia-Liang Zhu
- Department of Chemistry, National Dong Hwa University, Hualien 97401, Taiwan, R.O.C..
| | - Ming-Hsuan Tsai
- Department of Chemistry, National Dong Hwa University, Hualien 97401, Taiwan, R.O.C..
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Shi Y, Liu X, Han Y, Yan P, Bie F, Cao H. Diels–Alder reactions between cyclopentadiene analogs and benzoquinone in water and their application in the synthesis of polycyclic cage compounds. RSC Adv 2020; 10:739-745. [PMID: 35494451 PMCID: PMC9048223 DOI: 10.1039/c9ra09745g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 12/16/2019] [Indexed: 11/21/2022] Open
Abstract
Diels–Alder reactions between cyclopentadiene analogs and p-benzoquinone were explored in water and yielded 83–97% product, higher than the results reported in water with a catalyst or cetrimonium bromide (CTAB) micelles. The novel adduct 10 was synthesized and further used to synthesize the bi-cage hydrocarbon 4,4′-spirobi[pentacyclo[5.4.0.02,6.03,10.05,9]undecane], which has a high density (1.2663 g cm−3) and a high volumetric heat of combustion (53.353 MJ L−1). Four novel bi-cage hydrocarbon compounds were synthesized in water using this method starting from 2,2′-bi(p-benzoquinone) and cyclopentadiene analogs. Diels–Alder reactions between cyclopentadiene analogs and p-benzoquinone were explored in water and yielded 83–97% product, higher than the results reported in water with a catalyst or cetrimonium bromide (CTAB) micelles.![]()
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Affiliation(s)
- Yijun Shi
- Engineering and Technology Research Institute of Lunan Coal Chemical
- Zaozhuang University
- Zaozhuang 277160
- China
- College of Chemistry, Chemical Engineering and Materials Science
| | - Xuejing Liu
- Engineering and Technology Research Institute of Lunan Coal Chemical
- Zaozhuang University
- Zaozhuang 277160
- China
| | - Ying Han
- Engineering and Technology Research Institute of Lunan Coal Chemical
- Zaozhuang University
- Zaozhuang 277160
- China
| | - Peng Yan
- Engineering and Technology Research Institute of Lunan Coal Chemical
- Zaozhuang University
- Zaozhuang 277160
- China
| | - Fusheng Bie
- Engineering and Technology Research Institute of Lunan Coal Chemical
- Zaozhuang University
- Zaozhuang 277160
- China
| | - Han Cao
- Engineering and Technology Research Institute of Lunan Coal Chemical
- Zaozhuang University
- Zaozhuang 277160
- China
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Kristufek SL, Wacker KT, Tsao YYT, Su L, Wooley KL. Monomer design strategies to create natural product-based polymer materials. Nat Prod Rep 2017; 34:433-459. [DOI: 10.1039/c6np00112b] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In an effort towards enhancing function and sustainability, natural products have become of interest in the field of polymer chemistry.
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Affiliation(s)
- Samantha L. Kristufek
- Department of Chemistry
- Department of Chemical Engineering
- Department of Materials Science & Engineering
- Texas A&M University
- College Station
| | - Kevin T. Wacker
- Department of Chemistry
- Department of Chemical Engineering
- Department of Materials Science & Engineering
- Texas A&M University
- College Station
| | - Yi-Yun Timothy Tsao
- Department of Chemistry
- Department of Chemical Engineering
- Department of Materials Science & Engineering
- Texas A&M University
- College Station
| | - Lu Su
- Department of Chemistry
- Department of Chemical Engineering
- Department of Materials Science & Engineering
- Texas A&M University
- College Station
| | - Karen L. Wooley
- Department of Chemistry
- Department of Chemical Engineering
- Department of Materials Science & Engineering
- Texas A&M University
- College Station
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Singh PP, Ambika, Chauhan SMS. Chemoselective epoxidation of electron rich and electron deficient olefins catalyzed by meso-tetraarylporphyrin iron(iii) chlorides in imidazolium ionic liquids. NEW J CHEM 2012. [DOI: 10.1039/c1nj20739c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kaya AA, Şengül ME, Menzek A, Kayaardi İ, Karakuş M, Şahin E. Aromatisation in Adducts of α-Terpinene: Influence of Hindered Internal Rotations. JOURNAL OF CHEMICAL RESEARCH 2011. [DOI: 10.3184/174751911x13155890649111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Each adduct of α-terpinene with p-quinone and 1,4-naphthoquinone in Ac2O/Et3N at 180 °C gives two aromatic products, one of which had a distinctive smell formed by the loss of an ethylene group. Here, we report the crystal structure of (1RS, 4RS)-1-isopropyl-4-methyl-1,4-dihydro-1,4-ethanoanthracene-9,10-diyl diacetate. It is crystallised in an orthorhombic space group, Pbca, with cell dimensions a = 10.2899(7), b = 19.7804(9), c = 19.7519(8) Å and Z = 8. According to its NMR and X-ray diffraction data, the isopropyl and acetate groups slowly rotate.
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Affiliation(s)
- Afşin Ahmet Kaya
- Department of Chemistry, Faculty of Sciences, Atatürk University, 25240 Erzurum, Turkey
- Gümüşhane Vocational and Training School, Gümüşhane University, 29100 Gümüşhane, Turkey
| | - Mehmet Emin Şengül
- Department of Chemistry, Faculty of Sciences, Atatürk University, 25240 Erzurum, Turkey
| | - Abdullah Menzek
- Department of Chemistry, Faculty of Sciences, Atatürk University, 25240 Erzurum, Turkey
| | - İbrahim Kayaardi
- Department of Chemistry, Faculty of Sciences, Atatürk University, 25240 Erzurum, Turkey
| | - Murat Karakuş
- Department of Chemistry, Faculty of Sciences, Atatürk University, 25240 Erzurum, Turkey
| | - Ertan Şahin
- Department of Chemistry, Faculty of Sciences, Atatürk University, 25240 Erzurum, Turkey
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Haqghu M, Irani M, Gholami MR. Theoretical Study of Solvent and Substituent Effects on the Reactions of 1,4-Benzoquinone with Cyclopentadiene and Cyclohexadiene. PROGRESS IN REACTION KINETICS AND MECHANISM 2008. [DOI: 10.3184/146867808x315742] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Ab initio quantum mechanics and ONIOM calculations were used to study solvent and substituent effects on the reactions of 1,4-benzoquinone with cyclopentadiene and cyclohexadiene derivatives in tetrahydrofuran and greater water solvents. These calculations revealed (i) that increasing the number of electron donating methyl group substituents and (ii) the proximity of substituents to the reacting carbons (carbon atoms which contribute to the forming C—C bonds) on the diene, promote charge transfer from the diene to the dienophile in the transition state. These effects increase the negative charge on the oxygen atoms, destabilize the transition state in the organic solvent by increasing steric interactions, and stabilize the transition state in water solvent by increasing the strength of hydrogen bonding. These results, along with consideration of variations in the solvent-accessible surface area (SASA) confirmed that the dramatic acceleration in the rate of the studied reactions in water solvent arise in part from hydrophobic association of the reactants, but predominantly arise from hydrogen bonding between water molecules and the polarized transition state.
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Affiliation(s)
- Mohammad Haqghu
- Department of Chemistry, Sharif University of Technology, Azadi Ave., Tehran, Iran
| | - Mehdi Irani
- Department of Chemistry, Sharif University of Technology, Azadi Ave., Tehran, Iran
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Litz KE. Aqueous Ti(IV)-catalyzed Diels-Alder reaction. Molecules 2007; 12:1674-8. [PMID: 17960081 DOI: 10.3390/12081674] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2007] [Revised: 08/02/2007] [Accepted: 08/03/2007] [Indexed: 11/16/2022] Open
Abstract
The aqueous Diels-Alder reaction of 1,3-cyclohexadiene with 1,4-benzoquinone was compared and contrasted to the same reaction catalyzed with Flextyl P, a novel Ti(IV) performance catalyst. The catalyst improved conversion by 22% versus the uncatalyzed reaction and represents a rare example of a Ti(IV) catalyzed Diels-Alder reaction in water.
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Affiliation(s)
- Kyle E Litz
- Applied Nanoworks, Inc. 9 University Place, Rensselaer, NY 12144, USA.
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