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Zhou P, Wu S, Niu K, Song H, Liu Y, Zhang J, Wang Q. Intramolecular trapping of an iminium salt: rapid construction of quindoline derivatives. Chem Commun (Camb) 2024; 60:292-295. [PMID: 38059581 DOI: 10.1039/d3cc05143a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
Construction of the pyridine ring is a practical and streamline way to construct a variety of quindoline derivatives. We have developed a novel method for synthesis of quindoline derivatives by means of intramolecular ring-closure reactions of 3-N-methylphenylindoles via an iminium salt intermediate. This practical method has the advantages of a short reaction time, operational simplicity, and nearly quantitative yields; and it can be used for the rapid synthesis of a variety of valuable quindoline derivatives.
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Affiliation(s)
- Pan Zhou
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
| | - Senhui Wu
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
| | - Kaikai Niu
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
| | - Hongjian Song
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
| | - Yuxiu Liu
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
| | - Jingjing Zhang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
- College of Basic Science, Tianjin Agricultural University, Tianjin 300384, China
| | - Qingmin Wang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
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2
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Ushakov PY, Ioffe SL, Sukhorukov AY. Regio- and diastereoselective access to densely functionalized ketones via the Boekelheide rearrangement of isoxazoline N-oxides. Org Biomol Chem 2022; 20:5624-5637. [PMID: 35796681 DOI: 10.1039/d2ob00787h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In this work, the classical "isoxazoline route" toward aldols involving the [3 + 2]-cycloaddition of nitrile oxide to alkenes and hydrogenolysis of the oxime group was revisited. To avoid regioselectivity issues, [4 + 1]-annulation of nitroalkenes with sulfonium ylides was used to construct the isoxazoline ring bearing an N-oxide moiety. Subsequent deoxygenative C-H functionalization using the Boekelheide rearrangement and hydrogenolysis of the isoxazoline ring afforded α'-acyloxy-substituted aldols, which are difficult to access both by the classical aldol reaction and the "isoxazoline route". The products are formed in good to high overall yields and as single diastereomers in most cases. The synthetic use of these aldols was showcased by their smooth transformation into diastereomerically pure triols and a 2,3-diaryl-4-hydroxy-substituted tetrahydrofuran derivative, which is structurally related to cinncassin B.
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Affiliation(s)
- Pavel Yu Ushakov
- N. D. Zelinsky Institute of Organic Chemistry, 119991, Leninsky prospect, 47, Moscow, Russian Federation.
| | - Sema L Ioffe
- N. D. Zelinsky Institute of Organic Chemistry, 119991, Leninsky prospect, 47, Moscow, Russian Federation.
| | - Alexey Yu Sukhorukov
- N. D. Zelinsky Institute of Organic Chemistry, 119991, Leninsky prospect, 47, Moscow, Russian Federation.
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3
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Fulo HF, Rueb NJ, Gaston R, Batsomboon P, Ahmed KT, Barrios AM, Dudley GB. Synthesis of illudalic acid and analogous phosphatase inhibitors. Org Biomol Chem 2021; 19:10596-10600. [PMID: 34847212 PMCID: PMC8906844 DOI: 10.1039/d1ob02106k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Developing an efficient, concise synthesis of the fungal natural product illudalic acid has been a long-standing challenge, made more pressing by the recent discovery that illudalic acid and analogs are selective phosphatase inhibitors. Syntheses of illudalic acid have become progressively more efficient over the decades yet remain strategically grounded in a 17-step synthesis reported in 1977. Here we validate a two-step process-convergent [4 + 2] benzannulation and one-pot coordinated functional group manipulations-for preparing the key trifunctional pharmacophore of illudalic acid. The modular building blocks are readily available in 2-3 steps, for a longest linear sequence (LLS) of 5 steps to illudalic acid from 3,3-dimethylcyclopentanone. A small collection of analogous indanes and tetralins featuring the same pharmacophore were prepared by a similar route. These compounds potently and selectively inhibit the human leukocyte common antigen-related (LAR) subfamily of protein tyrosine phosphatases (PTPs). Evidence supporting a postulated covalent ligation mechanism is provided herein.
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Affiliation(s)
- Harvey F Fulo
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV, 26506, USA.
| | - Nicole J Rueb
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah, 84112, USA.
| | - Robert Gaston
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV, 26506, USA.
| | - Paratchata Batsomboon
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV, 26506, USA.
| | - Kh Tanvir Ahmed
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV, 26506, USA.
| | - Amy M Barrios
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah, 84112, USA.
| | - Gregory B Dudley
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV, 26506, USA.
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4
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Kanehara R, Tonouchi A, Konno K, Hashimoto M. Cyclohumulanoid Sesquiterpenes from the Culture Broth of the Basidiomycetous Fungus Daedaleopsis tricolor. Molecules 2021; 26:4364. [PMID: 34299640 PMCID: PMC8303491 DOI: 10.3390/molecules26144364] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 07/08/2021] [Accepted: 07/13/2021] [Indexed: 11/16/2022] Open
Abstract
A series of cyclohumulanoids, i.e., tricocerapicanols A-C (1a-1c), tricoprotoilludenes A (2a) and B (3), tricosterpurol (4), and tricoilludins A-C (5-7) were isolated along with known violascensol (2b) and omphadiol (8) from the culture broth of Daedaleopsis tricolor, an inedible but not toxic mushroom. The structures were fully elucidated on the basis of NMR spectroscopic analysis, and the suggested relative structures were confirmed via density functional theory (DFT)-based chemical shift calculations involving a DP4 probability analysis. In the present study, the 1H chemical shifts were more informative than the 13C chemical shifts to distinguish the diastereomers at C-11. The absolute configurations of 1-5 were determined by comparing the experimental and calculated electronic circular dichroism (ECD) spectra. For 6 and 7, the same chirality was assigned according to their biosynthetic similarities with the other compounds. The successful assignment of some Cotton effects was achieved by utilizing DFT calculations using simple model compounds. The plausible biosynthesis of 1-7 was also discussed on the basis of the structural commonality and general cyclohumulanoid biosynthesis. Compounds 2a and 5 were found to simultaneously induce hyphal swelling and branching at 5.0 μg/mL against a test fungus Cochliobolus miyabeanus.
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Affiliation(s)
- Ryuhi Kanehara
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki 036-8561, Japan; (R.K.); (A.T.)
| | - Akio Tonouchi
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki 036-8561, Japan; (R.K.); (A.T.)
| | - Katsuhiro Konno
- Institute of Natural Medicine, University of Toyama, Toyama 930-0194, Japan;
| | - Masaru Hashimoto
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki 036-8561, Japan; (R.K.); (A.T.)
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5
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Ushakov PY, Sukhorukov AY, Ioffe SL, Tabolin AA. Sequential Formal [4+1]‐Cycloaddition, C−H Functionalization and Suzuki–Miyaura Cross‐Coupling for the Synthesis of Trisubstituted Isoxazolines. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100313] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Pavel Yu. Ushakov
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
- Department of Chemistry M. V. Lomonosov Moscow State University Leninskie gory, 1, str. 3 119991 Moscow Russia
| | - Alexey Yu. Sukhorukov
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
- Plekhanov Russian University of Economics Stremyanny per. 36 117997 Moscow Russia
| | - Sema L. Ioffe
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
| | - Andrey A. Tabolin
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
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6
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Downs RP, Xiao Z, Ikedionwu MO, Cleveland JW, Lin Chin A, Cafferty AE, Darryl Quarles L, Carrick JD. Design and development of FGF-23 antagonists: Definition of the pharmacophore and initial structure-activity relationships probed by synthetic analogues. Bioorg Med Chem 2021; 29:115877. [PMID: 33232874 PMCID: PMC8007132 DOI: 10.1016/j.bmc.2020.115877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 11/05/2020] [Accepted: 11/10/2020] [Indexed: 10/22/2022]
Abstract
Hereditary hypophosphatemic disorders, TIO, and CKD conditions are believed to be influenced by an excess of Fibroblast Growth Factor-23 (FGF-23) which activates a binary renal FGFRs / α-Klotho complex to regulate homeostatic metabolism of phosphate and vitamin D. Adaptive FGF-23 responses from CKD patients with excess FGF-23 frequently lead to increased mortality from cardiovascular disease. A reversibly binding small molecule therapeutic has yet to emerge from research and development in this area. Current outcomes described in this work highlight efforts related to lead identification and modification using organic synthesis of strategic analogues to probe structure-activity relationships and preliminarily define the pharmacophore of a computationally derived hit obtained from virtual high-throughput screening. Synthetic strategies for the initial hit and analogue preparation, as well as preliminary cellular in vitro assay results highlighting sub micromolar inhibition of the FGF-23 signaling sequence at a concentration well below cytotoxicity are reported herein.
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Affiliation(s)
- Ryan P Downs
- Department of Chemistry, Tennessee Technological University, Cookeville, TN 38505-0001, USA
| | - Zhousheng Xiao
- Department of Medicine, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38165, USA
| | - Munachi O Ikedionwu
- Department of Chemistry, Tennessee Technological University, Cookeville, TN 38505-0001, USA
| | - Jacob W Cleveland
- Department of Chemistry, Tennessee Technological University, Cookeville, TN 38505-0001, USA
| | - Ai Lin Chin
- Department of Chemistry, Tennessee Technological University, Cookeville, TN 38505-0001, USA
| | - Abigail E Cafferty
- Department of Chemistry, Tennessee Technological University, Cookeville, TN 38505-0001, USA
| | - L Darryl Quarles
- Department of Medicine, College of Medicine, University of Tennessee Health Science Center, Memphis, TN 38165, USA
| | - Jesse D Carrick
- Department of Chemistry, Tennessee Technological University, Cookeville, TN 38505-0001, USA.
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7
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Dong C, Qiao T, Xie Y, Zhang X, Ao J, Liang G. Rapid construction of the ABD tricyclic skeleton in meliacarpinin B from carvone enabled by an INOC strategy. Org Chem Front 2020. [DOI: 10.1039/d0qo00576b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A highly diastereoselective synthesis of the ABD skeleton of meliacarpinin B is presented.
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Affiliation(s)
- Changming Dong
- State Key Laboratory of Elemento-organic Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Tianjiao Qiao
- State Key Laboratory of Elemento-organic Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Yi Xie
- State Key Laboratory of Elemento-organic Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Xiao Zhang
- State Key Laboratory of Elemento-organic Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Junli Ao
- State Key Laboratory of Elemento-organic Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Guangxin Liang
- School of Physial Science and Technology
- ShanghaiTech University
- Shanghai 201210
- China
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8
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Chen H, Zhao Z, Li Z, Dong Z, Wei K, Bai X, Zhang L, Wen C, Feng T, Liu J. Novel Natural Oximes and Oxime Esters with a Vibralactone Backbone from the Basidiomycete Boreostereum vibrans. ChemistryOpen 2016; 5:142-9. [PMID: 27308232 PMCID: PMC4906468 DOI: 10.1002/open.201500198] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Indexed: 11/18/2022] Open
Abstract
A variety of novel natural products with significant bioactivities are produced by the basidiomycete Boreostereum vibrans. In the present study, we describe 16 novel natural oximes and oxime esters with a vibralactone backbone, vibralactoximes, which were isolated from the scale-up fermentation broth of B. vibrans. Their structures were determined through extensive spectroscopic analyses. These compounds represent the first oxime esters from nature. The hypothetical biosynthetic pathway of these compounds was also proposed. Seven compounds exhibited significant pancreatic lipase inhibitory activity, while ten compounds exhibited cytotoxicities against five human cancer cell lines (HL-60, SMMC-7721, A-549, MCF-7, and SW480), with IC50 values comparable with those of cisplatin.
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Affiliation(s)
- He‐Ping Chen
- State Key Laboratory of Phytochemistryand Plant Resources in West China, Kunming Institute of BotanyChinese Academy of SciencesKunming650201P. R. China
- University of Chinese Academy of SciencesBeijing100049P.R. China
| | - Zhen‐Zhu Zhao
- State Key Laboratory of Phytochemistryand Plant Resources in West China, Kunming Institute of BotanyChinese Academy of SciencesKunming650201P. R. China
- University of Chinese Academy of SciencesBeijing100049P.R. China
| | - Zheng‐Hui Li
- State Key Laboratory of Phytochemistryand Plant Resources in West China, Kunming Institute of BotanyChinese Academy of SciencesKunming650201P. R. China
- School of Pharmaceutical SciencesSouth-Central University for NationalitiesWuhan430074P. R. China
| | - Ze‐Jun Dong
- State Key Laboratory of Phytochemistryand Plant Resources in West China, Kunming Institute of BotanyChinese Academy of SciencesKunming650201P. R. China
| | - Kun Wei
- State Key Laboratory of Phytochemistryand Plant Resources in West China, Kunming Institute of BotanyChinese Academy of SciencesKunming650201P. R. China
| | - Xue Bai
- State Key Laboratory of Phytochemistryand Plant Resources in West China, Kunming Institute of BotanyChinese Academy of SciencesKunming650201P. R. China
| | - Ling Zhang
- State Key Laboratory of Phytochemistryand Plant Resources in West China, Kunming Institute of BotanyChinese Academy of SciencesKunming650201P. R. China
| | - Chun‐Nan Wen
- State Key Laboratory of Phytochemistryand Plant Resources in West China, Kunming Institute of BotanyChinese Academy of SciencesKunming650201P. R. China
- University of Chinese Academy of SciencesBeijing100049P.R. China
| | - Tao Feng
- State Key Laboratory of Phytochemistryand Plant Resources in West China, Kunming Institute of BotanyChinese Academy of SciencesKunming650201P. R. China
- School of Pharmaceutical SciencesSouth-Central University for NationalitiesWuhan430074P. R. China
| | - Ji‐Kai Liu
- State Key Laboratory of Phytochemistryand Plant Resources in West China, Kunming Institute of BotanyChinese Academy of SciencesKunming650201P. R. China
- School of Pharmaceutical SciencesSouth-Central University for NationalitiesWuhan430074P. R. China
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9
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Stevens-Cullinane L, Lucas NT, Hawkins BC. Sterically Controlled Diels-Alder Cycloadditions: Rapid Entry into the Illudin Scaffold. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402461] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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10
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Chittimalla SK, Kuppusamy R, Thiyagarajan K, Bandi C. Reaction of Nitrile Oxides with Maskedo-Benzoquinones; Synthesis of Highly Functionalized Isoxazolines. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201670] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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11
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Romanski J, Nowak P, Maksymiuk A, Chapuis C, Jurczak J. Diastereoselective 1,3-dipolar cycloadditions of both electronically modified phenyl-nitrile oxides and stilbenes. RSC Adv 2013. [DOI: 10.1039/c3ra41718b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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12
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Tanasova M, Sturla SJ. Chemistry and biology of acylfulvenes: sesquiterpene-derived antitumor agents. Chem Rev 2012; 112:3578-610. [PMID: 22482429 DOI: 10.1021/cr2001367] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marina Tanasova
- ETH Zurich, Institute of Food, Nutrition and Health, Zurich, Switzerland
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13
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Crespo A, Coelho A, Diz PM, Fernández F, Novoa de Armas H, Sotelo E. Convergent assembly of structurally diverse quinazolines. Org Biomol Chem 2011; 9:351-7. [PMID: 21049105 DOI: 10.1039/c0ob00608d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Abel Crespo
- Combinatorial Chemistry Unit (COMBIOMED), Institute of Industrial Pharmacy (IFI), University of Santiago de Compostela, Santiago de Compostela 15782, Spain
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14
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Kamimura A, Yoshida T, Uno H. Stereoselective synthesis of azepines through the conjugate addition of formamides to nitroalkenes and subsequent intramolecular nitrile oxide cycloaddition reaction. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.09.070] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Shang Y, Feng Z, Yuan L, Wang S. Diastereoselective cycloadditions of a soluble polymer-supported substituted allyl alcohol derived from Baylis–Hillman reaction with nitrile oxides. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.04.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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17
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Romański J, Jóźwik J, Chapuis C, Jurczak J. Diastereoselective 1,3-Dipolar Cycloadditions of Chiral Derivatives of 2-Oxoethanenitrile Oxide to Noncyclic Conjugated Symmetrical Alkenes. Helv Chim Acta 2007. [DOI: 10.1002/hlca.200790219] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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18
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Luft JAR, Meleson K, Houk KN. Transition structures of diastereoselective 1,3-dipolar cycloadditions of nitrile oxides to chiral homoallylic alcohols. Org Lett 2007; 9:555-8. [PMID: 17253700 PMCID: PMC2533356 DOI: 10.1021/ol062751x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Transition structures of the 1,3-dipolar cycloaddition of substituted nitrile oxides with chiral homoallylic alcohols were explored with density functional theory (B3LYP/6-311+G(d,p)+CPCM(dichloromethane)//B3LYP/6-31+G(d)). The diastereoselectivity observed in these reactions was explained. The anti product is favored in both the thermal and magnesium-mediated reactions. Selectivity is predicted to increase in the presence of magnesium, in agreement with experimental results. The energetics of the magnesium-mediated reaction are similar to those previously found for allylic alcohols. [structure: see text].
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Affiliation(s)
- Jennifer A. R. Luft
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
| | - Kieche Meleson
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
| | - K. N. Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
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20
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Kamimura A, Kaneko Y, Ohta A, Matsuura K, Fujimoto Y, Kakehi A, Kanemasa S. Enantioselective preparation of 3,4,5-trisubstituted 4,5-dihydroisoxazoles and their stereoselective elaboration of 5-side chain. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)01255-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Kraus GA, Choudhury PK. Synthesis of puraquinonic acid ethyl ester and deliquinone via a common intermediate. J Org Chem 2002; 67:5857-9. [PMID: 12153294 DOI: 10.1021/jo020029g] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Both compounds were prepared via a common intermediate. The key features included the direct synthesis of the indan skeleton and the radical addition to a quinone.
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Affiliation(s)
- George A Kraus
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.
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