1
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Gond KK, Maddani MR. Addition of sulfonylphthalides to para-quinone methides: Selective 1,6-additions and oxidative annulations. Org Biomol Chem 2023; 21:2504-2508. [PMID: 36897072 DOI: 10.1039/d2ob02134j] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Abstract
KOtBu mediated addition of sulfonylphthalides to p-quinone methides led to the selective synthesis of isochroman-1,4-diones and addition products. Interestingly, isochroman-1,4-diones were obtained via an unprecedented oxidative annulation pathway. The present work highlights a wide variety of substrates, good yields, shorter reaction time and ambient reaction conditions. Furthermore, a few addition products were transformed into functionalized heterocyclic molecules. Additionally, the scale-up experiment suggests the practical feasibility of preparing isochroman-1,4-diones in higher-scale reactions.
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Affiliation(s)
- Kavyashree Kuppayya Gond
- Department of Post-Graduate Studies and Research in Chemistry, Mangalore University, Mangalagangothri-574199, India.
| | - Mahagundappa Rachappa Maddani
- Department of Post-Graduate Studies and Research in Chemistry, Mangalore University, Mangalagangothri-574199, India.
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2
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Shennan BDA, Berheci D, Crompton JL, Davidson TA, Field JL, Williams BA, Dixon DJ. Branching out: redox strategies towards the synthesis of acyclic α-tertiary ethers. Chem Soc Rev 2022; 51:5878-5929. [PMID: 35770619 DOI: 10.1039/d1cs00669j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Acyclic α-tertiary ethers represent a highly prevalent functionality, common to high-value bioactive molecules, such as pharmaceuticals and natural products, and feature as crucial synthetic handles in their construction. As such their synthesis has become an ever-more important goal in synthetic chemistry as the drawbacks of traditional strong base- and acid-mediated etherifications have become more limiting. In recent years, the generation of highly reactive intermediates via redox approaches has facilitated the synthesis of highly sterically-encumbered ethers and accordingly these strategies have been widely applied in α-tertiary ether synthesis. This review summarises and appraises the state-of-the-art in the application of redox strategies enabling acyclic α-tertiary ether synthesis.
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Affiliation(s)
- Benjamin D A Shennan
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Diana Berheci
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Jessica L Crompton
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Timothy A Davidson
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Joshua L Field
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Benedict A Williams
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Darren J Dixon
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
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3
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Yan Q, Fan R, Liu B, Su S, Wang B, Yao T, Tan J. Recent Progress in Aryne Participated Dearomatization Reactions. CHINESE J ORG CHEM 2021. [DOI: 10.6023/cjoc202009009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Wood JM, Satam NS, Almeida RG, Cristani VS, de Lima DP, Dantas-Pereira L, Salomão K, Menna-Barreto RF, Namboothiri IN, Bower JF, da Silva Júnior EN. Strategies towards potent trypanocidal drugs: Application of Rh-catalyzed [2 + 2 + 2] cycloadditions, sulfonyl phthalide annulation and nitroalkene reactions for the synthesis of substituted quinones and their evaluation against Trypanosoma cruzi. Bioorg Med Chem 2020; 28:115565. [DOI: 10.1016/j.bmc.2020.115565] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/21/2020] [Accepted: 05/22/2020] [Indexed: 02/08/2023]
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5
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China H, Tanihara K, Sasa H, Kikushima K, Dohi T. Regiodivergent oxidation of alkoxyarenes by hypervalent iodine/oxone® system. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.08.060] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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6
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Wood JM, da Silva Júnior EN, Bower JF. Rh-Catalyzed [2 + 2 + 2] Cycloadditions with Benzoquinones: De Novo Access to Naphthoquinones for Lignan and Type II Polyketide Synthesis. Org Lett 2020; 22:265-269. [PMID: 31850764 DOI: 10.1021/acs.orglett.9b04266] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The first examples of Rh-catalyzed [2 + 2 + 2] cycloadditions between diynes and benzoquinones are described. The method enables de novo and step-economical access to challenging naphthoquinones that are of relevance to lignan and type II polyketide synthesis. The value of the chemistry is demonstrated by a short total synthesis of justicidone.
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Affiliation(s)
- James M Wood
- School of Chemistry , University of Bristol , Bristol , BS8 1TS , United Kingdom
| | - Eufrânio N da Silva Júnior
- Institute of Exact Sciences, Department of Chemistry , Federal University of Minas Gerais , Belo Horizonte , MG 31270-901 , Brazil
| | - John F Bower
- School of Chemistry , University of Bristol , Bristol , BS8 1TS , United Kingdom
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7
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Cabrera-Afonso MJ, Lucena SR, Juarranz Á, Urbano A, Carreño MC. Selective Oxidative Dearomatization of Angular Tetracyclic Phenols by Controlled Irradiation under Air: Synthesis of an Angucyclinone-Type Double Peroxide with Anticancer Properties. Org Lett 2018; 20:6094-6098. [DOI: 10.1021/acs.orglett.8b02515] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- María J. Cabrera-Afonso
- Departamento de Química Orgánica, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049-Madrid, Spain
| | | | | | - Antonio Urbano
- Departamento de Química Orgánica, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049-Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), UAM, Cantoblanco, 28049-Madrid, Spain
| | - M. Carmen Carreño
- Departamento de Química Orgánica, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049-Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), UAM, Cantoblanco, 28049-Madrid, Spain
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8
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Heterologous Expression of a VioA Variant Activates Cryptic Compounds in a Marine-Derived Brevibacterium Strain. Mar Drugs 2018; 16:md16060191. [PMID: 29865236 PMCID: PMC6024985 DOI: 10.3390/md16060191] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 05/25/2018] [Accepted: 05/30/2018] [Indexed: 12/27/2022] Open
Abstract
A new 14-membered homodimeric macrodiolide, brevidiolide (3), along with four known aromatic compounds (1, 2, 4 and 5) were obtained by heterologous expression of the recombinant plasmid pWLI823 expressing the G231L variant of VioA in the marine-derived Brevibacterium sp. 7002-073. The structures of 1–5 were elucidated on the basis of LC-MS and 2D NMR spectroscopic analyses. In the evaluation for the antibacterial activities of the compounds against multi-drug resistant (MDR) strains, 5 showed notable growth inhibition against Staphylococcus aureus CCARM 3090 and Klebsiella pneumoniae ATCC 13883, with a minimum inhibitory concentration (MIC) value of 3.12 µg/mL.
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He C, Hu J, Wu Y, Ding H. Total Syntheses of Highly Oxidized ent-Kaurenoids Pharicin A, Pharicinin B, 7-O-Acetylpseurata C, and Pseurata C: A [5+2] Cascade Approach. J Am Chem Soc 2017; 139:6098-6101. [DOI: 10.1021/jacs.7b02746] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Chi He
- Department
of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Jialei Hu
- Department
of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Yubing Wu
- Department
of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Hanfeng Ding
- Department
of Chemistry, Zhejiang University, Hangzhou 310058, China
- State
Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
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10
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Kusumi S, Nakayama H, Kobayashi T, Kuriki H, Matsumoto Y, Takahashi D, Toshima K. Total Synthesis of Aquayamycin. Chemistry 2016; 22:18733-18736. [DOI: 10.1002/chem.201604697] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Shunichi Kusumi
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Harunobu Nakayama
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Takumi Kobayashi
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Hajime Kuriki
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Yuka Matsumoto
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Daisuke Takahashi
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Kazunobu Toshima
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
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11
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Ogata T, Yoshida T, Shimizu M, Tanaka M, Fukuhara C, Ishii J, Nishiuchi A, Inamoto K, Kimachi T. Unusual, chemoselective etherification of 2-hydroxy-1,4-naphthoquinone derivatives utilizing alkoxymethyl chlorides: scope, mechanism and application to the synthesis of biologically active natural product (±)-lantalucratin C. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.01.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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12
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Florea M, Marin R, Pălăşanu F, Neaţu F, Pârvulescu V. Mesostructured vanadia–alumina catalysts for the synthesis of vitamin K3. Catal Today 2015. [DOI: 10.1016/j.cattod.2014.12.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Harned AM. Asymmetric oxidative dearomatizations promoted by hypervalent iodine(III) reagents: an opportunity for rational catalyst design? Tetrahedron Lett 2014; 55:4681-4689. [PMID: 25147412 DOI: 10.1016/j.tetlet.2014.06.051] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The use of and λ3- and λ5-iodanes in the oxidative dearomatization of phenols is a well-established and general procedure for the construction of cyclohexadienone structures. However, their use in asymmetric dearomatization reactions is quite underdeveloped and, despite work by several research groups over the past several years, a general chiral aryl iodide catalyst has yet to emerge. This article will serve to highlight the significant progress that has been made in this area and will reveal some of deficiencies in the literature that the author believes may be hindering further progress.
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Affiliation(s)
- Andrew M Harned
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant St SE, Minneapolis, Minnesota 55455, United States
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14
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Vila-Gisbert S, Urbano A, Carreño MC. Model studies towards the challenging angularly-oxygenated core of several angucyclinones from an oxidative dearomatization strategy. Chem Commun (Camb) 2013; 49:3561-3. [DOI: 10.1039/c3cc41221k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Uyanik M, Mutsuga T, Ishihara K. IBS-catalyzed regioselective oxidation of phenols to 1,2-quinones with Oxone®. Molecules 2012; 17:8604-16. [PMID: 22810194 PMCID: PMC6268655 DOI: 10.3390/molecules17078604] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Revised: 07/06/2012] [Accepted: 07/12/2012] [Indexed: 11/18/2022] Open
Abstract
We have developed the first example of hypervalent iodine(V)-catalyzed regioselective oxidation of phenols to o-quinones. Various phenols could be oxidized to the corresponding o-quinones in good to excellent yields using catalytic amounts of sodium salts of 2-iodobenzenesulfonic acids (pre-IBSes) and stoichiometric amounts of Oxone® as a co-oxidant under mild conditions. The reaction rate of IBS-catalyzed oxidation under nonaqueous conditions was further accelerated in the presence of an inorganic base such as potassium carbonate (K2CO3), a phase transfer catalyst such as tetrabutylammonium hydrogen sulfate (nBu4NHSO4), and a dehydrating agent such as anhydrous sodium sulfate (Na2SO4).
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Affiliation(s)
- Muhammet Uyanik
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Tatsuya Mutsuga
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Kazuaki Ishihara
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
- Japan Science and Technology Agency (JST), CREST, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
- Author to whom correspondence should be addressed; ; Tel.: +81-52-789-3331; Fax: +81-52-789-3222
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16
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Ren Y, Jia J, Zhang TT, Wu HS, Liu W. Computational Study on the Palladium-Catalyzed Allenylative Dearomatization Reaction. Organometallics 2012. [DOI: 10.1021/om201248t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ying Ren
- School
of Chemistry
and Materials Science, Shanxi Normal University, Linfen 041004, People's Republic of China
| | - Jianfeng Jia
- School
of Chemistry
and Materials Science, Shanxi Normal University, Linfen 041004, People's Republic of China
| | - Ting-Ting Zhang
- School
of Chemistry
and Materials Science, Shanxi Normal University, Linfen 041004, People's Republic of China
| | - Hai-Shun Wu
- School
of Chemistry
and Materials Science, Shanxi Normal University, Linfen 041004, People's Republic of China
| | - Wenxian Liu
- School
of Chemistry
and Materials Science, Shanxi Normal University, Linfen 041004, People's Republic of China
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17
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Kholdeeva OA, Ivanchikova ID, Zalomaeva OV, Sorokin AB, Skobelev IY, Talsi EP. Mechanistic Insights into Oxidation of 2-Methyl-1-naphthol with Dioxygen: Autoxidation or a Spin-Forbidden Reaction? J Phys Chem B 2011; 115:11971-83. [DOI: 10.1021/jp2055975] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Oxana A. Kholdeeva
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Irina D. Ivanchikova
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Olga V. Zalomaeva
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Alexander B. Sorokin
- Institut de Recherches sur la Catalyse, CNRS, 2, Avenue A. Einstein, 69626 Villeurbanne Cedex, France
| | - Igor Y. Skobelev
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Eugenii P. Talsi
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
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18
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Palanichamy K, Kaliappan KP. Discovery and syntheses of "superbug challengers"-platensimycin and platencin. Chem Asian J 2010; 5:668-703. [PMID: 20209576 DOI: 10.1002/asia.200900423] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Bacteria have developed resistance to almost all existing antibiotics known today and this has been a major issue over the last few decades. The search for a new class of antibiotics with a new mode of action to fight these multiply-drug-resistant strains, or "superbugs", allowed a team of scientists at Merck to discover two novel antibiotics, platensimycin and platencin using advanced screening strategies, as inhibitors of bacterial fatty acid biosynthesis, which is essential for the survival of bacteria. Though both these antibiotics are structurally related, they work by slightly different mechanisms and target different enzymes conserved in the bacterial fatty acid biosynthesis. This Focus Review summarizes the synthetic and biological aspects of these natural products and their analogues and congeners.
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Affiliation(s)
- Kalanidhi Palanichamy
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400 076, India
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19
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Peng B, Feng X, Zhang X, Zhang S, Bao M. Propargylic and Allenic Carbocycle Synthesis through Palladium-Catalyzed Dearomatization Reaction. J Org Chem 2010; 75:2619-27. [DOI: 10.1021/jo100211d] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bo Peng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Xiujuan Feng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Xin Zhang
- School Environmental Science &Technology, Dalian University of Technology, Dalian 116023, China
| | - Sheng Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Ming Bao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
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20
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Schäfer S, Wirth T. A Versatile and Highly Reactive Polyfluorinated Hypervalent Iodine(III) Compound. Angew Chem Int Ed Engl 2010; 49:2786-9. [DOI: 10.1002/anie.200907134] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Schäfer S, Wirth T. Eine praktische und hochreaktive polyfluorierte hypervalente Iod(III)-Verbindung. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200907134] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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22
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23
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24
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Nicolaou KC, Li A, Edmonds DJ, Tria GS, Ellery SP. Total synthesis of platensimycin and related natural products. J Am Chem Soc 2009; 131:16905-18. [PMID: 19874023 PMCID: PMC2783699 DOI: 10.1021/ja9068003] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Platensimycin is the flagship member of a new and growing class of antibiotics with promising antibacterial properties against drug-resistant bacteria. The total syntheses of platensimycin and its congeners, platensimycins B(1) and B(3), platensic acid, methyl platensinoate, platensimide A, homoplatensimide A, and homoplatensimide A methyl ester, are described. The convergent strategy developed toward these target molecules involved construction of their cage-like core followed by attachment of the various side chains through amide bond formation. In addition to a racemic synthesis, two asymmetric routes to the core structure are described: one exploiting a rhodium-catalyzed asymmetric cycloisomerization, and another employing a hypervalent iodine-mediated de-aromatizing cyclization of an enantiopure substrate. The final two bonds of the core structure were forged through a samarium diiodide-mediated ketyl radical cyclization and an acid-catalyzed etherification. The rhodium-catalyzed asymmetric reaction involving a terminal acetylene was developed as a general method for the asymmetric cycloisomerization of terminal enynes.
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
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25
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Affiliation(s)
- Viktor V Zhdankin
- Department of Chemistry and Biochemistry, University of Minnesota Duluth, Duluth, Minnesota 55812, USA.
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26
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Bérard D, Giroux MA, Racicot L, Sabot C, Canesi S. Intriguing formal [2+3] cycloaddition promoted by a hypervalent iodine reagent. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.05.114] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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27
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Lu S, Xu Z, Bao M, Yamamoto Y. Carbocycle synthesis through facile and efficient palladium-catalyzed allylative de-aromatization of naphthalene and phenanthrene allyl chlorides. Angew Chem Int Ed Engl 2008; 47:4366-9. [PMID: 18442153 DOI: 10.1002/anie.200800529] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Shirong Lu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
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28
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Lu S, Xu Z, Bao M, Yamamoto Y. Carbocycle Synthesis through Facile and Efficient Palladium-Catalyzed Allylative De-aromatization of Naphthalene and Phenanthrene Allyl Chlorides. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200800529] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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29
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Abstract
Total synthesis campaigns toward complex heterocyclic natural products are a prime source of inspiration for the design and execution of complex cascade sequences, powerful reactions, and efficient synthetic strategies. We highlight selected examples of such innovations in the course of our total syntheses of diazonamide A, azaspiracid-1, thiostrepton, 2,2'-epi-cytoskyrin A and rugulosin, abyssomycin C, platensimycin, and uncialamycin.
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Affiliation(s)
- K. C. Nicolaou
- 1Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA and the Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Jason S. Chen
- 1Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA and the Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
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30
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Nicolaou KC, Edmonds DJ, Li A, Tria GS. Asymmetric total syntheses of platensimycin. Angew Chem Int Ed Engl 2007; 46:3942-5. [PMID: 17444571 DOI: 10.1002/anie.200700586] [Citation(s) in RCA: 168] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- K C Nicolaou
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
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31
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Lebrasseur N, Gagnepain J, Ozanne-Beaudenon A, Léger JM, Quideau S. Efficient access to orthoquinols and their [4 + 2] cyclodimers via SIBX-mediated hydroxylative phenol dearomatization. J Org Chem 2007; 72:6280-3. [PMID: 17628111 DOI: 10.1021/jo0708893] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
SIBX, the nonexplosive formulation of the lambda5-iodane 2-iodoxybenzioc acid (IBX), safely and efficiently mediates the hydroxylative dearomatization of various 2-alkylphenols and napthols into orthoquinols or their [4 + 2] cyclodimers. Reactions are typically run at room temperature using SIBX as a suspension in THF. Using these conditions, natural products such as the cyclodimer of the terpene carvacrol and, for the first time, the shikimate-derived (+/-)-grandifloracin were prepared in one step from their respective phenolic precursor.
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Affiliation(s)
- Nathalie Lebrasseur
- Université de Bordeaux, Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, 33607 Pessac Cedex, France
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Nicolaou K, Edmonds D, Li A, Tria G. Asymmetric Total Syntheses of Platensimycin. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200700586] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Affiliation(s)
- Dipakranjan Mal
- Department of Chemistry, Indian Institute of Technology, Kharagpur, 721302, India.
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Carreño MC, Somoza A, Ribagorda M, Urbano A. Asymmetric Synthesis of Rubiginones A2 and C2 and Their 11-Methoxy Regioisomers. Chemistry 2007; 13:879-90. [PMID: 17086571 DOI: 10.1002/chem.200600809] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Convergent enantioselective syntheses of angucyclinone-type natural products rubiginones A(2) (2) and C(2) (1) and their 11-methoxy regioisomers 3 a and 3 b have been achieved by using two domino processes from a common enantiomerically pure 1-vinylcyclohexene 4. Key steps in the synthesis of this diene were the stereoselective conjugate addition of AlMe(3) on (SS)-[(p-tolylsulfinyl)methyl]-p-quinol (9) and the elimination of the beta-hydroxy sulfoxide fragment, after oxidation to sulfone, to recover a carbonyl group. The first domino sequence comprised Diels-Alder reaction with a sulfinyl naphthoquinone followed by sulfoxide elimination. An efficient opposite regioselection in the cycloaddition step was achieved in the convergent construction of the tetracyclic skeleton using a sulfoxide at C-2 or C-3 of the dienophiles 5 or 6, derived from 5-methoxy-1,4-naphthoquinone. The second domino process, triggered by oxygen and sunlight, allowed the transformation of the initial tetracyclic adducts into the final products after B ring aromatization, silyl deprotection and C-1 oxidation.
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Affiliation(s)
- M Carmen Carreño
- Departamento de Química Orgánica (C-I), Universidad Autónoma. Cantoblanco, 28049 Madrid, Spain.
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