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Jabeen S, Ghosh G, Lapoot L, Durantini AM, Greer A. Sensitized Photooxidation of Ortho-prenyl Phenol: Biomimetic Dihydrobenzofuran Synthesis and Total 1 O 2 Quenching. Photochem Photobiol 2022; 99:637-641. [PMID: 35977738 DOI: 10.1111/php.13689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 08/05/2022] [Indexed: 11/30/2022]
Abstract
The sensitized photooxidation of ortho-prenyl phenol is described with evidence that solvent aproticity favors the formation of a dihydrobenzofuran [2-(prop-1-en-2-yl)-2,3-dihydrobenzofuran], a moiety commonly found in natural products. Benzene solvent increased the total quenching rate constant (kT ) of singlet oxygen with prenyl phenol by ~10-fold compared to methanol. A mechanism is proposed with preferential addition of singlet oxygen addition to prenyl site due to hydrogen bonding with phenol OH group, which causes a divergence away from the singlet oxygen 'ene' reaction toward the dihydrobenzofuran as the major product. The reaction is a mixed photooxidized system since an epoxide arises by a type I sensitized photooxidation.
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Affiliation(s)
- Shakeela Jabeen
- Department of Chemistry, Brooklyn College of the City University of New York, Brooklyn, New York 11210, United States.,Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Goutam Ghosh
- Department of Chemistry, Brooklyn College of the City University of New York, Brooklyn, New York 11210, United States.,Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Lloyd Lapoot
- Department of Chemistry, Brooklyn College of the City University of New York, Brooklyn, New York 11210, United States.,Ph.D. Program in Biochemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Andrés M Durantini
- Department of Chemistry, Brooklyn College of the City University of New York, Brooklyn, New York 11210, United States.,Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States.,IDAS-CONICET, Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta Nac. 36 Km 601, X5804BYA Río Cuarto, Córdoba, Argentina
| | - Alexander Greer
- Department of Chemistry, Brooklyn College of the City University of New York, Brooklyn, New York 11210, United States.,Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States.,Ph.D. Program in Biochemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
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Tang Y, Friesen JB, Nikolić DS, Lankin DC, McAlpine JB, Chen SN, Pauli GF. Silica Gel-mediated Oxidation of Prenyl Motifs Generates Natural Product-Like Artifacts. PLANTA MEDICA 2021; 87:998-1007. [PMID: 33975359 PMCID: PMC8867998 DOI: 10.1055/a-1472-6164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Prenyl moieties are commonly encountered in the natural products of terpenoid and mixed biosynthetic origin. The reactivity of unsaturated prenyl motifs is less recognized and shown here to affect the acyclic Rhodiola rosea monoterpene glycoside, kenposide A (8: ), which oxidizes readily on silica gel when exposed to air. The major degradation product mediated under these conditions was a new aldehyde, 9: . Exhibiting a shortened carbon skeleton formed through the breakdown of the terminal isopropenyl group, 9: is prone to acetalization in protic solvents. Further investigation of minor degradation products of both 8: and 8-prenylapigenin (8-PA, 12: ), a flavonoid with an ortho-prenyl substituent, revealed that the aldehyde formation was likely realized through epoxidation and subsequent cleavage at the prenyl olefinic bond. Employment of 1H NMR full spin analysis (HiFSA) achieved the assignment of all chemical shifts and coupling constants of the investigated terpenoids and facilitated the structural validation of the degradation product, 9: . This study indicates that prenylated compounds are generally susceptible to oxidative degradation, particularly in the presence of catalytic mediators, but also under physiological conditions. Such oxidative artifact/metabolite formation leads to a series of compounds with prenyl-derived (cyclic) partial structures that are analogous to species formed during Phase I metabolism in vivo. Phytochemical and pharmacological studies should take precautions or at least consider the impact of (unavoidable) exposure of prenyl-containing compounds to catalytic and/or oxidative conditions.
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Affiliation(s)
- Yu Tang
- UIC/NIH Center for Botanical Dietary Supplements Research, Pharmacognosy Institute, and Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, United States
| | - J. Brent Friesen
- Center for Natural Product Technologies (CENAPT), Pharmacognosy Institute, and Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, United States
- Physical Sciences Department, Rosary College of Arts and Sciences, Dominican University, River Forest, United States
| | - Dejan S. Nikolić
- UIC/NIH Center for Botanical Dietary Supplements Research, Pharmacognosy Institute, and Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, United States
| | - David C. Lankin
- UIC/NIH Center for Botanical Dietary Supplements Research, Pharmacognosy Institute, and Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, United States
| | - James B. McAlpine
- Center for Natural Product Technologies (CENAPT), Pharmacognosy Institute, and Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, United States
| | - Shao-Nong Chen
- UIC/NIH Center for Botanical Dietary Supplements Research, Pharmacognosy Institute, and Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, United States
- Center for Natural Product Technologies (CENAPT), Pharmacognosy Institute, and Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, United States
| | - Guido F. Pauli
- UIC/NIH Center for Botanical Dietary Supplements Research, Pharmacognosy Institute, and Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, United States
- Center for Natural Product Technologies (CENAPT), Pharmacognosy Institute, and Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, United States
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Abramova I, Rudshteyn B, Liebman JF, Greer A. Computed Regioselectivity and Conjectured Biological Activity of Ene Reactions of Singlet Oxygen with the Natural Product Hyperforin. Photochem Photobiol 2017; 93:626-631. [PMID: 28052331 DOI: 10.1111/php.12706] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 11/16/2016] [Indexed: 01/12/2023]
Abstract
Hyperforin is a constituent of St. John's wort and coexists with the singlet oxygen sensitizer hypericin. Density functional theory, molecular mechanics and Connolly surface calculations show that accessibility in the singlet oxygen "ene" reaction favors the hyperforin "southwest" and "southeast" prenyl (2-methyl-2-butenyl) groups over the northern prenyl groups. While the southern part of hyperforin is initially more susceptible to oxidation, up to 4 "ene" reactions of singlet oxygen can take place. Computational results assist in predicting the fate of adjacent hydroperoxides in hyperforin, where the loss of hydrogen atoms may lead to the formation of a hydrotrioxide and a carbonyl instead of a Russell reaction.
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Affiliation(s)
- Inna Abramova
- Department of Chemistry, Graduate Center, City University of New York, Brooklyn College, Brooklyn, NY
| | - Benjamin Rudshteyn
- Department of Chemistry, Graduate Center, City University of New York, Brooklyn College, Brooklyn, NY
| | - Joel F Liebman
- Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, MD
| | - Alexander Greer
- Department of Chemistry, Graduate Center, City University of New York, Brooklyn College, Brooklyn, NY
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Pinel B, Landreau A, Seraphin D, Larcher G, Bouchara JP, Richomme P. Synthesis of reduced xanthatin derivatives andin vitroevaluation of their antifungal activity. J Enzyme Inhib Med Chem 2008; 20:575-9. [PMID: 16408793 DOI: 10.1080/14756360500213231] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Abstract The synthesis of new xanthanolide derivatives is reported starting from xanthatin, a sesquiterpenic lactone isolated from Xanthium macrocarpum (Asteraceae). In vitro evaluation of their antifungal activity has been investigated.
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Affiliation(s)
- Benoit Pinel
- EA 921, Laboratoire SONAS, UFR des Sciences Pharmaceutiques et Ingénierie de la Santé, 16 Bd Daviers, 49100 Angers, France
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Helesbeux JJ, Duval O, Dartiguelongue C, Séraphin D, Oger JM, Richomme P. Synthesis of 2-hydroxy-3-methylbut-3-enyl substituted coumarins and xanthones as natural products. Application of the Schenck ene reaction of singlet oxygen with ortho-prenylphenol precursors. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.01.033] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Oger JM, Morel C, Helesbeux JJ, Litaudon M, Séraphin D, Dartiguelongue C, Larcher G, Richomme P, Duval O. First 2-hydroxy-3-methylbut-3-enyl substituted xanthones isolated from plants: structure elucidation, synthesis and antifungal activity. Nat Prod Res 2003; 17:195-9. [PMID: 12737404 DOI: 10.1080/1057563021000040808] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Two new 2-hydroxy-3-methylbut-3-enyl substituted xanthones, (+/-)-caledol 1 and (+/-)-dicaledol 2 were isolated from a dichloromethane extract of the leaves of Calophyllum caledonicum (Clusiaceae). Compounds 1 and 2 are the first 2-hydroxy-3-methylbut-3-enyl substituted xanthones isolated from natural source. Their structures were elucidated by means of combined analytical methods including HRFABMS, 1D and 2D NMR spectroscopies and also confirmed by total synthesis using biomimetic ortho-prenylphenols photooxygenation (1O2) as a key step. The antifungal activity against Aspergillus fumigatus is reported.
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Affiliation(s)
- Jean-Michel Oger
- SONAS, UFR des Sciences Pharmaceutiques et Ingénierie de la Santé, 16 Bd Daviers, F-49100 Angers, France.
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Hélesbeux JJ, Duval O, Séraphin D, Roussakis C, Richomme P. Synthesis and cytotoxic activity against a non-small-cell bronchopulmonary carcinoma line (NSCLC-N6) of benzofuran enantiomeric derivatives. J Enzyme Inhib Med Chem 2003; 18:159-65. [PMID: 12943200 DOI: 10.1080/1475636032000069828] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
The synthesis of 2-isopropenyl-2,3-dihydrobenzofuranic enantioisomers is described. Ortho-(2-hydroxy-3-methyl-but-3-enyl)phenol synthons are used as precursors to these structures. In vitro antitumor activity against a non-small-cell bronchopulmonary carcinoma line (NSCLC-N6) of these enantioisomers has been investigated.
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Affiliation(s)
- J J Hélesbeux
- Laboratoire SONAS, UFR des Sciences Pharmaceutiques et Ingénierie de la Santé, 16, Bd Daviers, 49100 Angers, France
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Helesbeux JJ, Peyronnet D, Labaïed M, Grellier P, Frappier F, Seraphin D, Richomme P, Duval O. Synthesis and antimalarial activity of some new 1,2-dioxolane derivatives. J Enzyme Inhib Med Chem 2002; 17:431-7. [PMID: 12683680 DOI: 10.1080/1475636021000005677] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
The synthesis of 1,2-dioxolane derivatives in two different acetophenone series, as simplified models of natural coumarins is described. 2-Acetyl-3-acetoxy-4-(3-hydroperoxy-3-methylbut-1-enyl)phenyl acetate and 2-acetyl-5-acetoxy4-(3-hydroperoxy-3-methylbut-1-enyl) phenyl acetate synthons are used as precursors to these structures. In vitro antimalarial activity of the 1,2-dioxolane derivatives has been investigated.
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Affiliation(s)
- Jean-Jacques Helesbeux
- SONAS, UFR des Sciences Pharmaceutiques et Ingénierie de la Santé, 16 Bd Daviers, 49100 Angers, France
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Hélesbeux JJ, Séraphin D, Duval O, Richomme P, Bruneton J. Studies on the reactivity of a tertiary allylic alcohol in an acetophenonic series, a model for natural products synthesis. J Pharm Pharmacol 2001; 53:955-8. [PMID: 11480546 DOI: 10.1211/0022357011776379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
The synthesis of benzopyranic simplified analogues of dibenzopyranic natural compounds is described, together with the access to a precursor of a new furobenzopyranic natural product. These natural products have anti-cancer activity. The 1,3-diacetoxy-2-acetyl-4-(3-hydroxy-3-methylbut-1-enyl)benzene synthone is used as a common precursor to these structures.
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Affiliation(s)
- J J Hélesbeux
- SONAS, UFR des Sciences Pharmaceutiques et Ingénierie de la Santé, Angers, France
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