1
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Signetti L, Elizarov N, Simsir M, Paquet A, Douguet D, Labbal F, Debayle D, Di Giorgio A, Biou V, Girard C, Duca M, Bretillon L, Bertolotto C, Verrier B, Azoulay S, Mus-Veteau I. Inhibition of Patched Drug Efflux Increases Vemurafenib Effectiveness against Resistant Braf V600E Melanoma. Cancers (Basel) 2020; 12:cancers12061500. [PMID: 32526884 PMCID: PMC7352342 DOI: 10.3390/cancers12061500] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/03/2020] [Accepted: 06/05/2020] [Indexed: 12/25/2022] Open
Abstract
Melanoma patients harboring the BRAFV600E mutation are treated with vemurafenib. Almost all of them ultimately acquire resistance, leading to disease progression. Here, we find that a small molecule from a marine sponge, panicein A hydroquinone (PAH), overcomes resistance of BRAFV600E melanoma cells to vemurafenib, leading to tumor elimination in corresponding human xenograft models in mice. We report the synthesis of PAH and demonstrate that this compound inhibits the drug efflux activity of the Hedgehog receptor, Patched. Our SAR study allowed identifying a key pharmacophore responsible for this activity. We showed that Patched is strongly expressed in metastatic samples from a cohort of melanoma patients and is correlated with decreased overall survival. Patched is a multidrug transporter that uses the proton motive force to efflux drugs. This makes its function specific to cancer cells, thereby avoiding toxicity issues that are commonly observed with inhibitors of ABC multidrug transporters. Our data provide strong evidence that PAH is a highly promising lead for the treatment of vemurafenib resistant BRAFV600E melanoma.
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Affiliation(s)
- Laurie Signetti
- Université Côte d’Azur, CNRS, IPMC, 660 Route des Lucioles, 06560 Valobonne, France; (L.S.); (M.S.); (A.P.); (D.D.); (F.L.); (D.D.)
| | - Nelli Elizarov
- Université Côte d’Azur, CNRS, ICN, 28 Avenue Valrose, 06108 Nice, CEDEX 2, France; (N.E.); (A.D.G.); (M.D.)
| | - Méliné Simsir
- Université Côte d’Azur, CNRS, IPMC, 660 Route des Lucioles, 06560 Valobonne, France; (L.S.); (M.S.); (A.P.); (D.D.); (F.L.); (D.D.)
| | - Agnès Paquet
- Université Côte d’Azur, CNRS, IPMC, 660 Route des Lucioles, 06560 Valobonne, France; (L.S.); (M.S.); (A.P.); (D.D.); (F.L.); (D.D.)
| | - Dominique Douguet
- Université Côte d’Azur, CNRS, IPMC, 660 Route des Lucioles, 06560 Valobonne, France; (L.S.); (M.S.); (A.P.); (D.D.); (F.L.); (D.D.)
| | - Fabien Labbal
- Université Côte d’Azur, CNRS, IPMC, 660 Route des Lucioles, 06560 Valobonne, France; (L.S.); (M.S.); (A.P.); (D.D.); (F.L.); (D.D.)
| | - Delphine Debayle
- Université Côte d’Azur, CNRS, IPMC, 660 Route des Lucioles, 06560 Valobonne, France; (L.S.); (M.S.); (A.P.); (D.D.); (F.L.); (D.D.)
| | - Audrey Di Giorgio
- Université Côte d’Azur, CNRS, ICN, 28 Avenue Valrose, 06108 Nice, CEDEX 2, France; (N.E.); (A.D.G.); (M.D.)
| | - Valérie Biou
- CNRS, IBPC, Sorbonne Paris Cité, Laboratoire de Biologie Physico-Chimique des Protéines Membranaires, Institut de Biologie Physico-Chimique, University Paris Diderot, 13 rue Pierre et Marie Curie, 75005 Paris, France;
| | - Christophe Girard
- Université Côte d’Azur, INSERM, CNRS, C3M, Bâtiment Universitaire ARCHIMED 151 Route Saint Antoine de Ginestière BP 2 3194, 06204 Nice, CEDEX 3, France; (C.G.); (C.B.)
| | - Maria Duca
- Université Côte d’Azur, CNRS, ICN, 28 Avenue Valrose, 06108 Nice, CEDEX 2, France; (N.E.); (A.D.G.); (M.D.)
| | - Lionel Bretillon
- Centre des Sciences du Goût et de l’Alimentation, Université Bourgogne Franche-Comté CNRS, INRA, SSGA, AgroSup Dijon, F-21000 Dijon, France;
| | - Corine Bertolotto
- Université Côte d’Azur, INSERM, CNRS, C3M, Bâtiment Universitaire ARCHIMED 151 Route Saint Antoine de Ginestière BP 2 3194, 06204 Nice, CEDEX 3, France; (C.G.); (C.B.)
| | - Bernard Verrier
- Adjuvatis SAS, IBCP, 7 Passage du Vercors—69007 Lyon, France;
| | - Stéphane Azoulay
- Université Côte d’Azur, CNRS, ICN, 28 Avenue Valrose, 06108 Nice, CEDEX 2, France; (N.E.); (A.D.G.); (M.D.)
- Correspondence: (S.A.); (I.M.-V.)
| | - Isabelle Mus-Veteau
- Université Côte d’Azur, CNRS, IPMC, 660 Route des Lucioles, 06560 Valobonne, France; (L.S.); (M.S.); (A.P.); (D.D.); (F.L.); (D.D.)
- Correspondence: (S.A.); (I.M.-V.)
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2
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Hui Z, Jiang S, Qi X, Ye XY, Xie T. Investigating the microwave-accelerated Claisen rearrangement of allyl aryl ethers: Scope of the catalysts, solvents, temperatures, and substrates. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Norhierridin B, a New Hierridin B-Based Hydroquinone with Improved Antiproliferative Activity. Molecules 2020; 25:molecules25071578. [PMID: 32235535 PMCID: PMC7181126 DOI: 10.3390/molecules25071578] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 03/26/2020] [Accepted: 03/29/2020] [Indexed: 12/05/2022] Open
Abstract
Hierridin B (6), a methylated hydroquinone isolated from the marine picocyanobacterium Cyanobium sp. LEGE 06113, moderately inhibited the growth of colon adenocarcinoma HT-29 cells. Aiming to improve the potential antitumor activity of this natural product, the demethylated analogue, norhierridin B (10), as well as its structurally-related quinone (9), were synthesized and evaluated for their growth inhibitory effect on a panel of human tumor cell lines, including the triple-negative breast cancer (TNBC) cells MDA-MB-231, SKBR3, and MDA-MB-468. Norhierridin B (10) showed a potent growth inhibitory effect on all cancer cell lines. Moreover, the growth inhibitory effect of compound 10 on MDA-MB-231 cells was associated with cell cycle arrest and apoptosis. Norhierridin B (10) interfered with several p53 transcriptional targets, increasing p21, Bax, and MDM2, while decreasing Bcl-2 protein levels, which suggested the potential activation of a p53 pathway. Altogether, these results evidenced a great improvement of the antitumor activity of hydroquinone 10 when compared to 6 and its structurally-related quinone (9). Notably, hydroquinone 10 displayed a prominent growth inhibitory activity against TNBC cells, which are characterized by high therapeutic resistance.
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5
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Kotha S, Meshram M. Development of New Synthetic Strategies, Tactics and their Applications. CHEM REC 2019; 19:2480-2504. [DOI: 10.1002/tcr.201900041] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 09/18/2019] [Accepted: 09/19/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of ChemistryIndian Institute of Technology Bombay Powai Mumbai- 400 076 India
| | - Milind Meshram
- Department of ChemistryIndian Institute of Technology Bombay Powai Mumbai- 400 076 India
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6
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Leishmanicidal and antimicrobial activity of primin and primin-containing extracts from Miconia willdenowii. Fitoterapia 2019; 138:104297. [PMID: 31404617 DOI: 10.1016/j.fitote.2019.104297] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 08/06/2019] [Accepted: 08/06/2019] [Indexed: 11/23/2022]
Abstract
As a part of an ongoing bioprospective project, searching for potential medicinal plants from the Brazilian Atlantic Forest, Miconia willdenowii was selected for its potential leishmanicidal and antimicrobial activities. The crude ethanolic extract of M. willdenowii showed an inhibition of 99.7% of the promastigote forms of Leishmania amazonensis at the concentration of 80 μg/mL. Further investigation of its antimicrobial activity against pathogenic fungi and Gram positive and negative bacteria, revealed a significant antimicrobial activity. A bioguided study with its liquid-liquid partition fractions revealed the hexane fraction (Hex) as the most active against Leishmania, inhibiting 99.2% and 46.9% of the protozoan at concentrations of 40 and 20 μg/mL, respectively. Hex also showed significant antimicrobial activity against Staphylococcus aureus and Candida krusei with IC50 of 15.6 and 62.5 μg/mL, respectively. Purification of Hex led to the isolation of 2-methoxy-6-pentyl-benzoquinone (1, also known as primin) as the active metabolite, probably responsible for the observed antimicrobial and anti-leishmania effects. Primin (1) disclosed leishmanicidal activity (IC50 = 1.25 μM), showing higher potency than the standard drug amphotericin B (IC50 = 5.08 μM), with additional antifungal effects against all tested fungi species. Compound 1 also showed significant activity against S. aureus (IC50 = 8.94 μM), showing a comparable potency with the reference drug chloramphenicol (IC50 = 6.19 μM), but with a potential cytotoxicity towards peripheral human blood mononuclear cells (CC50 = 255.15 μM). Here in, the antimicrobial and anti-L. amazonensis effects of M. willdenowii are reported for the first time, as well as Primin (1) as its probable bioactive metabolite.
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Hsieh CE, Jiang YM, Chou CM. Functionalized Allyl Aryl Ether Synthesis from Benzoic Acids Using a Dearomatization and Decarboxylative Allylation Approach. J Org Chem 2019; 84:653-665. [PMID: 30596422 DOI: 10.1021/acs.joc.8b02487] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A strategy toward the preparation of substituted allyl aryl ethers from benzoic acids via a dearomatization and decarboxylative allylation (DcA) reaction is presented. The benzoic acids undergo a dearomatization to give alkylated 2,5-cyclohexadienyl ketoesters which are subjected to a palladium-catalyzed DcA reaction, providing a variety of functionalized allyl aryl ethers. In addition, the combination of a resonance stabilized DcA reaction with a Claisen rearrangement for the synthesis of multisubstituted phenols and applying to dihydroplicatin B derivative synthesis is also presented.
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Affiliation(s)
- Cheng-En Hsieh
- Department of Applied Chemistry , National University of Kaohsiung , 700, Kaohsiung University Road , Nanzih District, 81148 Kaohsiung , Taiwan
| | - Yu-Min Jiang
- Department of Applied Chemistry , National University of Kaohsiung , 700, Kaohsiung University Road , Nanzih District, 81148 Kaohsiung , Taiwan
| | - Chih-Ming Chou
- Department of Applied Chemistry , National University of Kaohsiung , 700, Kaohsiung University Road , Nanzih District, 81148 Kaohsiung , Taiwan
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8
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Sun DY, Han GY, Yang NN, Lan LF, Li XW, Guo YW. Racemic trinorsesquiterpenoids from the Beihai sponge Spongia officinalis: structure and biomimetic total synthesis. Org Chem Front 2018. [DOI: 10.1039/c7qo01091e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two rare new furan butanolides, sponalisolides A (1) and B (2), were isolated from the Beihai sponge Spongia officinalis, and fully characterized by extensive spectroscopic analysis and biomimetic total synthesis.
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Affiliation(s)
- Dong-Yu Sun
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Guan-Ying Han
- School of Pharmaceutical Sciences
- Jinzhou Medical University
- Jinzhou 121001
- China
- The First Affiliated Hospital of Jinzhou Medical University
| | - Na-Na Yang
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Le-Fu Lan
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Xu-Wen Li
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Yue-Wei Guo
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
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9
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Schranz M, Lorber K, Klos K, Kerschbaumer J, Buettner A. Influence of the chemical structure on the odor qualities and odor thresholds of guaiacol-derived odorants, Part 1: Alkylated, alkenylated and methoxylated derivatives. Food Chem 2017; 232:808-819. [DOI: 10.1016/j.foodchem.2017.04.070] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 04/02/2017] [Accepted: 04/11/2017] [Indexed: 10/19/2022]
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10
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Konrádová D, Kozubíková H, Doležal K, Pospíšil J. Microwave-Assisted Synthesis of Phenylpropanoids and Coumarins: Total Synthesis of Osthol. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701021] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Daniela Konrádová
- Laboratory of Growth Regulators; Palacký University & Institute of Experimental Botany AS CR; Šlechtitelů 27 78371 Olomouc Czech Republic
| | - Hana Kozubíková
- Department of Chemical Biology and Genetics; Centre of the Region Haná for Biotechnological and Agricultural Research; Faculty of Science; Palacký University; Šlechtitelů 27 78371 Olomouc Czech Republic
| | - Karel Doležal
- Laboratory of Growth Regulators; Palacký University & Institute of Experimental Botany AS CR; Šlechtitelů 27 78371 Olomouc Czech Republic
- Department of Chemical Biology and Genetics; Centre of the Region Haná for Biotechnological and Agricultural Research; Faculty of Science; Palacký University; Šlechtitelů 27 78371 Olomouc Czech Republic
| | - Jiří Pospíšil
- Laboratory of Growth Regulators; Palacký University & Institute of Experimental Botany AS CR; Šlechtitelů 27 78371 Olomouc Czech Republic
- Department of Chemical Biology and Genetics; Centre of the Region Haná for Biotechnological and Agricultural Research; Faculty of Science; Palacký University; Šlechtitelů 27 78371 Olomouc Czech Republic
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11
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Sisa M, Dvorakova M, Vanek T. Concise access to primin, miconidin and related natural resorcinols. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.07.029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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12
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Fiorini L, Tribalat MA, Sauvard L, Cazareth J, Lalli E, Broutin I, Thomas OP, Mus-Veteau I. Natural paniceins from mediterranean sponge inhibit the multidrug resistance activity of Patched and increase chemotherapy efficiency on melanoma cells. Oncotarget 2016; 6:22282-97. [PMID: 26068979 PMCID: PMC4673163 DOI: 10.18632/oncotarget.4162] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Accepted: 05/20/2015] [Indexed: 01/27/2023] Open
Abstract
Multidrug resistance has appeared to mitigate the efficiency of anticancer drugs and the possibility of successful cancer chemotherapy. The Hedgehog receptor Patched is a multidrug transporter expressed in several cancers and as such it represents a new target to circumvent chemotherapy resistance. We report herein that paniceins and especially panicein A hydroquinone, natural meroterpenoids produced by the Mediterranean sponge Haliclona (Soestella) mucosa, inhibit the doxorubicin efflux activity of Patched and enhance the cytotoxicity of this chemotherapeutic agent on melanoma cells in vitro. These results are supported by the molecular docking performed on the structure of the bacterial drug efflux pump AcrB and on the Patched model built from AcrB structure. Docking calculations show that panicein A hydroquinone interacts with AcrB and Patched model close to the doxorubicin binding site. This compound thus appears as the first antagonist of the doxorubicin efflux activity of Patched. The use of inhibitors of Patched drug efflux activity in combination with classical chemotherapy could represent a novel approach to reduce tumor drug resistance, recurrence and metastasis.
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Affiliation(s)
- Laura Fiorini
- Institut de Pharmacologie Moléculaire et Cellulaire, UMR 7275, Université Nice Sophia Antipolis, CNRS, Valbonne, France
| | - Marie-Aude Tribalat
- Institut de Chimie de Nice, UMR 7272, Université Nice Sophia Antipolis, CNRS, Faculté des Sciences, Nice, France
| | - Lucy Sauvard
- Institut de Pharmacologie Moléculaire et Cellulaire, UMR 7275, Université Nice Sophia Antipolis, CNRS, Valbonne, France.,Institut de Chimie de Nice, UMR 7272, Université Nice Sophia Antipolis, CNRS, Faculté des Sciences, Nice, France
| | - Julie Cazareth
- Institut de Pharmacologie Moléculaire et Cellulaire, UMR 7275, Université Nice Sophia Antipolis, CNRS, Valbonne, France
| | - Enzo Lalli
- Institut de Pharmacologie Moléculaire et Cellulaire, UMR 7275, Université Nice Sophia Antipolis, CNRS, Valbonne, France
| | - Isabelle Broutin
- Laboratoire de Cristallographie et RMN Biologiques, UMR 8015, CNRS - Faculte de Pharmacie, Paris, France
| | - Olivier P Thomas
- Institut de Chimie de Nice, UMR 7272, Université Nice Sophia Antipolis, CNRS, Faculté des Sciences, Nice, France.,Institut Méditerranéen de Biodiversité et d'Ecologie Marine et Continentale, UMR 7263, CNRS, IRD, Université Aix-Marseille, Université Avignon, Station Marine d'Endoume, Marseille, France
| | - Isabelle Mus-Veteau
- Institut de Pharmacologie Moléculaire et Cellulaire, UMR 7275, Université Nice Sophia Antipolis, CNRS, Valbonne, France
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13
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Bochicchio A, Cefola R, Choppin S, Colobert F, Di Noia MA, Funicello M, Hanquet G, Pisano I, Todisco S, Chiummiento L. Selective Claisen rearrangement and iodination for the synthesis of polyoxygenated allyl phenol derivatives. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.07.079] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Fernandes RA, Patil PH, Chaudhari DA. Dimeric Pyranonaphthoquinones: Isolation, Bioactivity, and Synthetic Approaches. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600544] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Rodney A. Fernandes
- Department of Chemistry; Indian Institute of Technology Bombay; Powai 400076 Mumbai Maharashtra India
| | - Pradnya H. Patil
- Department of Chemistry; Indian Institute of Technology Bombay; Powai 400076 Mumbai Maharashtra India
| | - Dipali A. Chaudhari
- Department of Chemistry; Indian Institute of Technology Bombay; Powai 400076 Mumbai Maharashtra India
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15
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Ricard S, Sanapo GF, Rahem N, Daoust B. Synthesis of γ,δ-Unsaturated α-Aminoaldehydes Using a Copper-Catalyzed Vinylation Reaction Followed by a Claisen Rearrangement. J Org Chem 2016; 81:5066-73. [PMID: 27223885 DOI: 10.1021/acs.joc.6b00512] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new method to synthesize γ,δ-unsaturated α-nitrogenated aldehydes in very good yields is described herein. This method involves a copper-coupling reaction between β-iodoenamide derivatives and allylic alcohols to generate β-allyloxyenamide derivatives. The latter, when heated, undergo a Claisen rearrangement and form γ,δ-unsaturated α-nitrogenated aldehydes.
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Affiliation(s)
- Simon Ricard
- Département de Chimie, Biochimie et Physique, Université du Québec à Trois-Rivières , Trois-Rivières, Québec G9A 5H7, Canada
| | - Gabriel F Sanapo
- Département de Chimie, Biochimie et Physique, Université du Québec à Trois-Rivières , Trois-Rivières, Québec G9A 5H7, Canada
| | - Neel Rahem
- Département de Chimie, Biochimie et Physique, Université du Québec à Trois-Rivières , Trois-Rivières, Québec G9A 5H7, Canada
| | - Benoit Daoust
- Département de Chimie, Biochimie et Physique, Université du Québec à Trois-Rivières , Trois-Rivières, Québec G9A 5H7, Canada
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16
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Yeung L, Pilkington LI, Cadelis MM, Copp BR, Barker D. Total synthesis of panicein A2. Beilstein J Org Chem 2015; 11:1991-6. [PMID: 26664619 PMCID: PMC4660959 DOI: 10.3762/bjoc.11.215] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 10/06/2015] [Indexed: 11/23/2022] Open
Abstract
The first total synthesis of the unusual aromatic sesquiterpene panicein A2 is reported and the structure of the natural product has been confirmed. When tested by the NCI against a range of human cancer cell lines, it was found that panicein A2 exhibits very little antiproliferative activity at 10 μM – an observation that is at odds with the earlier report that stated panicein A2 exhibits in vitro cytotoxicity against a number of tumour cell lines.
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Affiliation(s)
- Lili Yeung
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Lisa I Pilkington
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Melissa M Cadelis
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Brent R Copp
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - David Barker
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand
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17
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Hou S, Liu Y, Kong Y, Brown ML. Total Synthesis of 7-Hydroxymurrayazolinine, Murrayamine D, and Mahanine via m-Nitro Group Activated Pyran Annulation. Org Lett 2015; 17:2298-301. [PMID: 25919697 DOI: 10.1021/acs.orglett.5b00422] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The facile total synthesis of the natural product (±)-mahanine was obtained in eight steps with an overall 52% yield from readily accessible known nitrophenol derivative 6. After a one-step, acid-catalyzed annulation, two additional natural products were formed including 7-hydroxymurrayazolinine, representing its first reported total synthesis. In the whole process, the introduction of the m-nitro group significantly enhanced the key pyran annulation reaction through inductive effects.
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Affiliation(s)
- Shujie Hou
- Center for Drug Discovery, Georgetown University Medical Center, Research Building, EP07, 3970 Reservoir Road, NW, Washington, D.C. 20057, United States
| | - Yong Liu
- Center for Drug Discovery, Georgetown University Medical Center, Research Building, EP07, 3970 Reservoir Road, NW, Washington, D.C. 20057, United States
| | - Yali Kong
- Center for Drug Discovery, Georgetown University Medical Center, Research Building, EP07, 3970 Reservoir Road, NW, Washington, D.C. 20057, United States
| | - Milton L Brown
- Center for Drug Discovery, Georgetown University Medical Center, Research Building, EP07, 3970 Reservoir Road, NW, Washington, D.C. 20057, United States
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18
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Horikoshi S, Watanabe T, Kamata M, Suzuki Y, Serpone N. Microwave-assisted organic syntheses: microwave effect on intramolecular reactions – the Claisen rearrangement of allylphenyl ether and 1-allyloxy-4-methoxybenzene. RSC Adv 2015. [DOI: 10.1039/c5ra18039b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
We examined the possible effect microwaves may have on intramolecular reactions such as the Claisen-type rearrangement process carried out in DMSO solvent and in solvent-free microwave irradiation conditions.
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Affiliation(s)
- Satoshi Horikoshi
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Tomoki Watanabe
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Momoko Kamata
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Yumiko Suzuki
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Nick Serpone
- PhotoGreen Laboratory
- Dipartimento di Chimica
- Universita di Pavia
- Pavia 27100
- Italy
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19
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Quinone and hydroquinone metabolites from the ascidians of the genus Aplidium. Mar Drugs 2014; 12:3608-33. [PMID: 24927227 PMCID: PMC4071593 DOI: 10.3390/md12063608] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 06/03/2014] [Accepted: 06/04/2014] [Indexed: 11/16/2022] Open
Abstract
Ascidians of the genus Aplidium are recognized as an important source of chemical diversity and bioactive natural products. Among the compounds produced by this genus are non-nitrogenous metabolites, mainly prenylated quinones and hydroquinones. This review discusses the isolation, structural elucidation, and biological activities of quinones, hydroquinones, rossinones, longithorones, longithorols, floresolides, scabellones, conicaquinones, aplidinones, thiaplidiaquinones, and conithiaquinones. A compilation of the 13C-NMR spectral data of these compounds is also presented.
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Wang W, Zhou R, Jiang ZJ, Wang K, Fu HY, Zheng XL, Chen H, Li RX. An Efficient Palladium-Catalyzed Synthesis of Cinnamyl Ethers from Aromatic Halides, Phenols, and Allylic Chloride. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201300757] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Manvar A, Shah A. Subtle Mitsunobu couplings under super-heating: the role of high-throughput continuous flow and microwave strategies. Org Biomol Chem 2014; 12:8112-24. [DOI: 10.1039/c4ob01432d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Fragile Mitsunobu reaction can efficiently be performed under super-heating.
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Affiliation(s)
- Atul Manvar
- Department of Pharmaceutical and Medicinal Chemistry
- Royal College of Surgeons in Ireland
- Dublin, Ireland
| | - Anamik Shah
- National Facility for Drug Discovery
- Centre of Excellence
- Saurashtra University
- Rajkot-360005, India
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22
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Wu LQ, Yang CG, Yang LM, Yang LJ. Ultrasound-Assisted Wittig Reaction: A Short, Efficient Synthesis of 2-Methoxy-6-Alkyl-1,4-Benzoquinones. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200900008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Hsieh HP, Chen AC, Villarante NR, Chuang GJ, Liao CC. Substituent effects on the photorearrangements of unsymmetrically substituted diazinobarrelenes. RSC Adv 2013. [DOI: 10.1039/c2ra22276k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Prasada Rao Lingam V, Dahale DH, Mukkanti K, Gopalan B, Thomas A. Microwave-assisted Claisen rearrangement of naphthyl 2-propynyl ethers: synthesis of naphthofurans. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.08.053] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abstract
The synthesis of various axially substituted titanium phthalocyanines in high yield using microwave irradiation without an added solvent is reported. The times of reaction, as expected, are short and generally less than 10 minutes. The products were obtained in high purity after chromatography.
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Affiliation(s)
- Suzanne E. Maree
- Department of Chemistry, University of Zululand, Private Bag X1001, KwaDlangezwa, 3886 Kwa-Zulu Natal, South Africa
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26
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Sunassee SN, Davies-Coleman MT. Cytotoxic and antioxidant marine prenylated quinones and hydroquinones. Nat Prod Rep 2012; 29:513-35. [DOI: 10.1039/c2np00086e] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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27
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Katoh T, Watanabe K, Sugizaki T, Tozawa Y. A NEW ENTRY TO THE SYNTHESIS OF PRIMIN VIA A B-ALKYL SUZUKI–MIYAURA CROSS-COUPLING REACTION. HETEROCYCLES 2012. [DOI: 10.3987/com-12-s(n)104] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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28
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Li X, Zhang X, Yu Z, Liu X, You Q, Guo Q. Microwave-Assisted Claisen Rearrangement/Diels–Alder Cascade reaction for the Synthesis of Caged Garcinia Natural Products and Analogues. JOURNAL OF CHEMICAL RESEARCH 2011. [DOI: 10.3184/174751911x13191290708355] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A microwave-assisted Claisen rearrangement/Diels–Alder cascade reaction was used to synthesise caged Garcinia natural products and analogues containing the unique 4-oxa-tricyclo[4.3.1.03,7]decan-2-one scaffold from xanthone-based and chromone-based substrates. Forbesione and cluvenone as well as two new and six known caged analogues were obtained. Compared with the traditional thermal method, the reaction time was reduced dramatically and the yield was greatly improved under microwave irradiation. In addition, the regioselectivity observed in the cascade reaction has also been rationalised. Garcinia have long been used in folk medicines for their healing, antibacterial, and cytotoxic activities.
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Affiliation(s)
- Xiang Li
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Xiaojin Zhang
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Zhuoqin Yu
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Xiaorong Liu
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Qidong You
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Qinglong Guo
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
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Padwal J, Lewis W, Moody CJ. Synthesis of Balsaminone A, a Naturally Occurring Pentacyclic Dinaphthofuran Quinone. J Org Chem 2011; 76:8082-7. [DOI: 10.1021/jo201395n] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jalindar Padwal
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - William Lewis
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Christopher J. Moody
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
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Nawrat CC, Lewis W, Moody CJ. Synthesis of Amino-1,4-benzoquinones and Their Use in Diels–Alder Approaches to the Aminonaphthoquinone Antibiotics. J Org Chem 2011; 76:7872-81. [PMID: 21866924 DOI: 10.1021/jo201320g] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Christopher C. Nawrat
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - William Lewis
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Christopher J. Moody
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
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Lucas CL, Lygo B, Blake AJ, Lewis W, Moody CJ. Regioselectivity of the Claisen rearrangement in meta-allyloxy aryl ketones: an experimental and computational study, and application in the synthesis of (R)-(-)-pestalotheol D. Chemistry 2011; 17:1972-8. [PMID: 21274949 DOI: 10.1002/chem.201002757] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2010] [Indexed: 11/10/2022]
Abstract
A study of the regioselectivity of the Claisen rearrangement of meta-allyloxy aryl ketones showed that the electron-withdrawing carbonyl group has a major influence and strongly directs rearrangement to the more hindered ortho position. However, when the ketone is part of a ring structure, its electronic effect can be negated by conversion into its triisopropylsilyl enol ether, which dramatically reverses the regiochemistry of the Claisen rearrangement. DFT calculations suggest that the effect is electronic although there is also a steric effect of the bulky silyl group. This strategy for influencing the regiochemical outcome of the Claisen rearrangement was then employed in a short synthesis of the furo[2,3-g]chromene, (-)-pestalotheol D, that confirms the absolute stereochemistry of the natural product.
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Affiliation(s)
- Catherine L Lucas
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK
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Affiliation(s)
- Xavier Bugaut
- CNRS, Institut de Chimie des Substances Naturelles (ICSN), UPR 2301, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
| | - Xavier Guinchard
- CNRS, Institut de Chimie des Substances Naturelles (ICSN), UPR 2301, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
| | - Emmanuel Roulland
- CNRS, Institut de Chimie des Substances Naturelles (ICSN), UPR 2301, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
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33
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Bruder M, Smith SJ, Blake AJ, Moody CJ. Synthesis of (±)-likonide B (smenochromene D) using a regioselective Claisen rearrangement, separation of the enantiomers and stereochemical assignment. Org Biomol Chem 2009; 7:2127-34. [DOI: 10.1039/b901358j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Bowman MD, Schmink JR, McGowan CM, Kormos CM, Leadbeater NE. Scale-Up of Microwave-Promoted Reactions to the Multigram Level Using a Sealed-Vessel Microwave Apparatus. Org Process Res Dev 2008. [DOI: 10.1021/op8001239] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Matthew D. Bowman
- Department of Chemistry, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, U.S.A., and Department of Chemistry, Merrimack College, 315 Turnpike Street, North Andover, Massachusetts 01845, U.S.A
| | - Jason R. Schmink
- Department of Chemistry, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, U.S.A., and Department of Chemistry, Merrimack College, 315 Turnpike Street, North Andover, Massachusetts 01845, U.S.A
| | - Cynthia M. McGowan
- Department of Chemistry, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, U.S.A., and Department of Chemistry, Merrimack College, 315 Turnpike Street, North Andover, Massachusetts 01845, U.S.A
| | - Chad M. Kormos
- Department of Chemistry, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, U.S.A., and Department of Chemistry, Merrimack College, 315 Turnpike Street, North Andover, Massachusetts 01845, U.S.A
| | - Nicholas E. Leadbeater
- Department of Chemistry, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, U.S.A., and Department of Chemistry, Merrimack College, 315 Turnpike Street, North Andover, Massachusetts 01845, U.S.A
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35
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Guillonneau L, Taddei D, Moody CJ. Synthesis of the Reported Structure of the Bisbenzoquinone Lanciaquinone, Isolated from Maesa lanceolata. Org Lett 2008; 10:4505-8. [DOI: 10.1021/ol801697g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Loic Guillonneau
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - David Taddei
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Christopher J. Moody
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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36
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Coombes CL, Moody CJ. First syntheses of 2,2-dimethyl-7-(2'-methylbut-3'-en-2'-yl)-2H-chromen-6-ol and 2-(3'-methylbut-2'-enyl)-5-(2'-methylbut-3'-en-2'-yl)-1,4-benzoquinone, novel prenylated quinone derivatives from the New Zealand brown alga Perithalia capillaris. J Org Chem 2008; 73:6758-62. [PMID: 18681403 DOI: 10.1021/jo801057x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first syntheses of 2,2-dimethyl-7-(2'-methylbut-3'-en-2'-yl)-2H-chromen-6-ol (1) and 2-(3'-methylbut-2'-enyl)-5-(2'-methylbut-3'-en-2'-yl)-1,4-benzoquinone (2), novel prenylated quinone derivatives from the New Zealand brown alga Perithalia capillaris, are reported, in which the key steps are consecutive Claisen rearrangements that proceed with both high chemo- and regioselectivity.
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Affiliation(s)
- Catherine L Coombes
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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37
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Worayuthakarn R, Boonya-udtayan S, Arom-oon E, Ploypradith P, Ruchirawat S, Thasana N. Synthesis of unsymmetrical benzil licoagrodione. J Org Chem 2008; 73:7432-5. [PMID: 18712927 DOI: 10.1021/jo8013353] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A synthesis of unsymmetrical 1,2-diarylethane-1,2-dione is reported involving the intramolecular cyclization of anionic benzylic ester of the aryl benzyl ether followed by oxidation employing dioxirane. With the use of microwave irradiation, licoagrodione was prepared from Claisen rearrangement of the corresponding allyl phenyl ether 1,2-diketone readily available from the Lindlar's reduction of the corresponding alkyne derivative. Subsequent removal of protecting groups then furnished the desired product.
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Affiliation(s)
- Rattana Worayuthakarn
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, Laksi, Bangkok 10210, Thailand
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38
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Nicolaou KC, Lister T, Denton RM, Gelin CF. Total synthesis of atrochamins F, H, I, and J through cascade reactions. Tetrahedron 2008; 64:4736-4757. [PMID: 19461992 DOI: 10.1016/j.tet.2008.02.108] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A concise and efficient cascade-based total synthesis of artochamins F, H, I, and J is described. The potential biogenetic connection between artochamin F, or a derivative thereof, and artochamins H, I, and J, through an unusual formal [2+2] cycloaddition process, was shown to be feasible. An alternative mechanism for this transformation is also proposed.
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla 92037, U.S.A
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39
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Colucci MA, Moody CJ, Couch GD. Natural and synthetic quinones and their reduction by the quinone reductase enzyme NQO1: from synthetic organic chemistry to compounds with anticancer potential. Org Biomol Chem 2007; 6:637-56. [PMID: 18264564 DOI: 10.1039/b715270a] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The quinone reductase enzyme NAD(P)H: quinone oxidoreductase 1 (NQO1) is a ubiquitous flavoenzyme that catalyzes the two-electron reduction of quinones. This Perspective briefly reviews the structure and mechanism, physiological role, and upregulation and induction of the enzyme, but focuses on the synthesis of new heterocyclic quinones and their metabolism by recombinant human NQO1. Thus a range of indolequinones, some of which are novel analogues of mitomycin C, benzimidazolequinones, benzothiazolequinones and quinolinequinones have been prepared and evaluated, leading to detailed knowledge of the structural requirements for efficient metabolism by the enzyme. Potent mechanism-based inhibitors (suicide substrates) of NQO1 have also been developed. These indolequinones irreversibly alkylate the protein, preventing its function both in standard enzyme assays and also in cells. Some of these quinones are also potent inhibitors of growth of human pancreatic cancer cells, suggesting a potential role for such compounds as therapeutic agents.
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Affiliation(s)
- Marie A Colucci
- School of Chemistry, University of Nottingham, University Park, Nottingham, UK NG7 2RD
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40
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McErlean CSP, Moody CJ. First Synthesis of N-(3-Carboxylpropyl)-5-amino-2-hydroxy-3- tridecyl-1,4-benzoquinone, an Unusual Quinone Isolated from Embelia ribes. J Org Chem 2007; 72:10298-301. [DOI: 10.1021/jo702101w] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Christopher J. Moody
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
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41
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McErlean CS, Sperry J, Blake AJ, Moody CJ. Synthesis of the calothrixins, pentacyclic indolo[3,2-j]phenanthridine alkaloids, using a biomimetic approach. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.08.057] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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42
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Lin YL, Cheng JY, Chu YH. Microwave-accelerated Claisen rearrangement in bicyclic imidazolium [b-3C-im][NTf2] ionic liquid. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.08.060] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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43
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Li P, Forbeck EM, Evans CD, Joullié MM. Trisubstituted aziridine ring-opening by phenol derivatives: stereo- and regioselective formation of chiral tertiary alkyl-aryl ethers. Org Lett 2007; 8:5105-7. [PMID: 17048854 DOI: 10.1021/ol062010w] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An unprecedented stereo- and regioselective trisubstituted aziridine ring-opening by phenol derivatives was discovered. The reaction features very mild reaction conditions and broad functional group compatibility, which provides a good method for the stereoselective formation of tertiary alkyl-aryl ethers in highly functionalized systems. [reaction: see text]
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Affiliation(s)
- Pixu Li
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
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Govender S, Mmutlane EM, van Otterlo WAL, de Koning CB. Bidirectional racemic synthesis of the biologically active quinone cardinalin 3. Org Biomol Chem 2007; 5:2433-40. [PMID: 17637963 DOI: 10.1039/b707187f] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Readily available 2,2',6,6'-tetramethoxy-1,1'-biphenyl was transformed in 14 synthetic steps into the natural product cardinalin 3 using a bidirectional approach. One of the key steps was the formation of the cis-1,3-dimethylnaphtho[2,3-c]pyran ring. (+/-)-1,1'-[6,6'-Diallyl-5,5'-bis(benzyloxy)-1,1',3,3'-tetramethoxy-2,2'-binaphthalene-7,7'-diyl]diethanol was treated with O(2) in the presence of CuCl(2) and catalytic PdCl(2) to afford 5,5'-bis(benzyloxy)-7,7',9,9'-tetramethoxy-1,1',3,3'-tetramethyl-1H,1'H-8,8'-bibenzo[g]isochromene. Hydrogenation of this compound afforded 7,7',9,9'-tetramethoxy-cis-1,3-cis-1',3'-tetramethyl-3,3',4,4'-tetrahydro-1H,1'H-8,8'-bibenzo[g]isochromene-5,5'-diol in quantitative yield, which was converted in 3 steps to cardinalin 3.
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Affiliation(s)
- Sameshnee Govender
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO Wits 2050, South Africa
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Abstract
This review covers the literature published in 2005 for marine natural products, with 704 citations (493 for the period January to December 2005) referring to compounds isolated from marine microorganisms and phytoplankton, green algae, brown algae, red algae, sponges, coelenterates, bryozoans, molluscs, tunicates and echinoderms. The emphasis is on new compounds (812 for 2005), together with their relevant biological activities, source organisms and country of origin. Biosynthetic studies, first syntheses, and syntheses that lead to the revision of structures or stereochemistries, have been included.
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Affiliation(s)
- John W Blunt
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
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McErlean CSP, Proisy N, Davis CJ, Boland NA, Sharp SY, Boxall K, Slawin AMZ, Workman P, Moody CJ. Synthetic ansamycins prepared by a ring-expanding Claisen rearrangement. Synthesis and biological evaluation of ring and conformational analogues of the Hsp90 molecular chaperone inhibitor geldanamycin. Org Biomol Chem 2007; 5:531-46. [PMID: 17252137 DOI: 10.1039/b615378j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A series of ansa-quinones has been prepared by chemical synthesis, and evaluated by biological techniques. Thus, 19-membered ansa-lactams, simplified analogues of the naturally occurring Hsp90 molecular chaperone inhibitor geldanamycin, were obtained by concise routes, the key steps being the combination of a ring-closing metathesis to give a 17-membered ring followed by Claisen rearrangement to effect ring expansion. The methodology was also used to prepare an "unnatural" 18-membered ring analogue. In ATPase enzyme assays, the synthetic ansa-quinones were weak inhibitors of Hsp90.
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47
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Catalyst economy. Part 2: Sequential metathesis—Kharasch sequences using the Grubbs metathesis catalysts. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2005.12.018] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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48
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Zalomaeva OV, Sorokin AB. Access to functionalized quinones via the aromatic oxidation of phenols bearing an alcohol or olefinic function catalyzed by supported iron phthalocyanine. NEW J CHEM 2006. [DOI: 10.1039/b608834a] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Jacob AM, Moody CJ. Microwave-assisted combined Mitsunobu reaction–Claisen rearrangement and microwave-assisted phenol oxidation: rapid synthesis of 2,6-disubstituted-1,4-benzoquinone natural products. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.10.096] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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