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Ghosh A, Brueckner AC, Cheong PHY, Carter RG. Second-Generation Synthesis of the Northern Fragment of Mandelalide A: Role of π-Stacking on Sharpless Dihydroxylation of cis-Enynes. J Org Chem 2019; 84:9196-9214. [PMID: 31264876 DOI: 10.1021/acs.joc.9b01153] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The development of a π-stacking-based approach for increased stereoselectivity in Sharpless asymmetric and diastereomeric dihydroxylation of cis-enynes is disclosed. The use of neighboring, electron-rich benzoate esters proved key to the success of this process. Density functional theory study suggests that the substrate benzoate ester group rigidifies the dihydroxylation transition states by forming a favorable π-stacking interaction in both Major-TS and Minor-TS. The energetic preference for the Major-TS was found in part because of the favorable eclipsing conformation of the alkene substituent as opposed to the disfavored bisecting conformation found in the Minor-TS. The application to a second-generation synthesis of the C15-C24 northern portion of mandelalide A is demonstrated.
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Affiliation(s)
- Ankan Ghosh
- Department of Chemistry , Oregon State University , Corvallis , Oregon 97331 , United States
| | - Alexander C Brueckner
- Department of Chemistry , Oregon State University , Corvallis , Oregon 97331 , United States
| | - Paul Ha-Yeon Cheong
- Department of Chemistry , Oregon State University , Corvallis , Oregon 97331 , United States
| | - Rich G Carter
- Department of Chemistry , Oregon State University , Corvallis , Oregon 97331 , United States
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2
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Carter AC, King JB, Mattes AO, Cai S, Singh N, Cichewicz RH. Natural-Product-Inspired Compounds as Countermeasures against the Liver Carcinogen Aflatoxin B 1. JOURNAL OF NATURAL PRODUCTS 2019; 82:1694-1703. [PMID: 31136174 DOI: 10.1021/acs.jnatprod.9b00290] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Aflatoxin B1 (AfB1) ranks among the most potent liver carcinogens known, and the accidental or intentional exposure of humans and livestock to this toxin remains a serious global threat. One protective measure that had been proposed is employing small-molecule therapeutics capable of mitigating the toxicity of AfB1; however, to date, these efforts have had little clinical success. To identify molecular scaffolds that reduce the toxicity of AfB1, we developed a cell-based high-throughput high-content imaging assay that enabled our team to test natural products (pure compounds, fractions, and extracts) for protection of monolayers and spheroids composed of HepG2 liver cells against AfB1. The spheroid assay showed notable potential for further development, as it afforded greater sensitivity of HepG2 cells to AfB1, which is believed to better mimic the in vivo response of hepatocytes to the toxin. One of the most bioactive compounds to arise from this investigation was alternariol-9-methyl ether (1, purified from an Alternaria sp. isolate), which inspired the synthesis and testing of several structurally related molecules. Based on these findings, it is proposed that several types of natural and synthetic polyarene molecules that have undergone oxidative functionalization (e.g., compounds containing 3-methoxyphenol moieties) are promising starting points for the development of new agents that protect against AfB1 toxicity.
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Affiliation(s)
- Adam C Carter
- Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry & Biochemistry, Stephenson Life Science Research Center , University of Oklahoma , 101 Stephenson Parkway , Norman , Oklahoma 73019 , United States
| | - Jarrod B King
- Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry & Biochemistry, Stephenson Life Science Research Center , University of Oklahoma , 101 Stephenson Parkway , Norman , Oklahoma 73019 , United States
| | - Allison O Mattes
- Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry & Biochemistry, Stephenson Life Science Research Center , University of Oklahoma , 101 Stephenson Parkway , Norman , Oklahoma 73019 , United States
| | - Shengxin Cai
- Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry & Biochemistry, Stephenson Life Science Research Center , University of Oklahoma , 101 Stephenson Parkway , Norman , Oklahoma 73019 , United States
| | - Narender Singh
- CFD Research Corporation , 701 McMillian Way, Suite D , Huntsville , Alabama 35806 , United States
| | - Robert H Cichewicz
- Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry & Biochemistry, Stephenson Life Science Research Center , University of Oklahoma , 101 Stephenson Parkway , Norman , Oklahoma 73019 , United States
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3
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Davis RW, Allweil A, Tian J, Brash AR, Sulikowski GA. Stereocontrolled synthesis of four isomeric linoleate triols of relevance to skin barrier formation and function. Tetrahedron Lett 2018; 59:4571-4573. [PMID: 30906077 DOI: 10.1016/j.tetlet.2018.11.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Linoleate triol esters are intermediates along the pathway of formation of the mammalian skin permeability barrier. In connection with the study of their involvement in barrier formation we required access to isomerically pure and defined samples of four linoleate triol esters. A common synthetic strategy was developed starting from isomeric alkynols derived from d-tartaric acid and 2-deoxy-d-ribose.
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Affiliation(s)
- Robert W Davis
- Department of Chemistry, Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA
| | - Alexander Allweil
- Department of Chemistry, Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA
| | - Jianhua Tian
- Department of Chemistry, Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA
| | - Alan R Brash
- Department of Pharmacology, Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Gary A Sulikowski
- Department of Chemistry, Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA.,Department of Pharmacology, Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37232, USA
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4
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Hurtak JA, McDonald FE. Synthesis of the ABC Substructure of Brevenal by Sequential exo-Mode Oxacyclizations of Acyclic Polyene Precursors. Org Lett 2017; 19:6036-6039. [DOI: 10.1021/acs.orglett.7b02538] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jessica A. Hurtak
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Frank E. McDonald
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
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5
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Gil A, Albericio F, Álvarez M. Role of the Nozaki–Hiyama–Takai–Kishi Reaction in the Synthesis of Natural Products. Chem Rev 2017. [DOI: 10.1021/acs.chemrev.7b00144] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Alejandro Gil
- ChemBio Lab, Barcelona Science Park, Baldiri Reixac 10, E-08028 Barcelona, Spain
- CIBER-BBN,
Networking
Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park, Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Fernando Albericio
- ChemBio Lab, Barcelona Science Park, Baldiri Reixac 10, E-08028 Barcelona, Spain
- CIBER-BBN,
Networking
Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park, Baldiri Reixac 10, 08028 Barcelona, Spain
- University of Kwa-Zulu-Natal, 4001, Durban, South Africa
| | - Mercedes Álvarez
- ChemBio Lab, Barcelona Science Park, Baldiri Reixac 10, E-08028 Barcelona, Spain
- CIBER-BBN,
Networking
Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park, Baldiri Reixac 10, 08028 Barcelona, Spain
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6
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Veerasamy N, Ghosh A, Li J, Watanabe K, Serrill JD, Ishmael JE, McPhail KL, Carter RG. Enantioselective Total Synthesis of Mandelalide A and Isomandelalide A: Discovery of a Cytotoxic Ring-Expanded Isomer. J Am Chem Soc 2016; 138:770-3. [DOI: 10.1021/jacs.5b12318] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
| | | | | | - Kazuhiro Watanabe
- Laboratory
of Synthetic and Medicinal Chemistry, Tohoku Pharmaceutical University, Sendai 981-8558, Japan
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7
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Fujita M. Optically Active Hypervalent Organoiodine(III)-induced Asymmetric Oxidation of Alkene. J SYN ORG CHEM JPN 2016. [DOI: 10.5059/yukigoseikyokaishi.74.233] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Goh WYL, Chai CLL, Chen A. Synthesis and Biological Studies of a Triazole Analogue of Resorcylic Acid Lactone LL-Z1640-2. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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Karmakar R, Pahari P, Mal D. Phthalides and Phthalans: Synthetic Methodologies and Their Applications in the Total Synthesis. Chem Rev 2014; 114:6213-84. [DOI: 10.1021/cr400524q] [Citation(s) in RCA: 249] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Raju Karmakar
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
- Technical University of Braunschweig, 38106 Braunschweig, Germany
| | - Pallab Pahari
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
- Synthetic
Organic Chemistry Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Dipakranjan Mal
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
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10
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Abstract
This review covers the literature published in 2012 for marine natural products, with 1035 citations (673 for the period January to December 2012) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1241 for 2012), together with the 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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11
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Abstract
This review will focus on selected applications of Sonogashira coupling and subsequent transformations as key steps in the total synthesis of natural products.
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Affiliation(s)
- Dan Wang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- Department of Chemistry
- East China Normal University
- Shanghai 200062, China
| | - Shuanhu Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- Department of Chemistry
- East China Normal University
- Shanghai 200062, China
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12
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Shimogaki M, Fujita M, Sugimura T. Enantioselective Oxidation of Alkenylbenzoates Catalyzed by Chiral Hypervalent Iodine(III) To Yield 4-Hydroxyisochroman-1-ones. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300959] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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13
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Affiliation(s)
- U Bin Kim
- School of Chemical Sciences, The University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Daniel P. Furkert
- School of Chemical Sciences, The University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Margaret A. Brimble
- School of Chemical Sciences, The University of Auckland, 23 Symonds Street, Auckland, New Zealand
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