1
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Barnes L, Birkinshaw TN, Senior AJ, Brügge OS, Lewis W, Argent SP, Moody CJ, Nortcliffe A. Iodoetherification as a strategy towards sp 3-rich scaffolds for drug discovery. Bioorg Med Chem 2024; 101:117636. [PMID: 38354458 DOI: 10.1016/j.bmc.2024.117636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/30/2024] [Accepted: 02/07/2024] [Indexed: 02/16/2024]
Abstract
Functionalised tetrahydropyran and spirooxepane scaffolds were prepared utilising an iodoetherification strategy and elaborated to demonstrate their potential use in library synthesis. The iodoetherification products could be readily transformed to the corresponding azides that could be further functionalised via copper-catalysed azide-alkyne cycloaddition or reduction to the amine. The lead-likeness and three-dimensionality of the scaffolds were examined and compared to commercial libraries.
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Affiliation(s)
- Lydia Barnes
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Timothy N Birkinshaw
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Aaron J Senior
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Oscar Siles Brügge
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - William Lewis
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Stephen P Argent
- 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
| | - Andrew Nortcliffe
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
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2
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Wang L, Lin S, Zhu Y, Ferrante D, Ishak T, Baba Y, Sharma A. α-Hydroxy boron-enabled regioselective access to bifunctional halo-boryl alicyclic ethers and α-halo borons. Chem Commun (Camb) 2021; 57:4564-4567. [PMID: 33955990 DOI: 10.1039/d1cc00336d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
α-Hydroxy borons are an underutilized class of compounds and their only previous application involved oxidation into acylborons. Herein, we describe the synthesis of functionalized olefinic α-hydroxy borons and their utility to enable a novel and regioselective route to hitherto unknown bifunctional halo-boryl tetrahydrofurans/tetrahydropyrans and α-halo MIDA boronates. The orthogonally functionalized alicyclic ethers provided a building block-based approach for diversification of the tetrahydrofuran core.
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Affiliation(s)
- Lucia Wang
- Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA.
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3
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Poock C, Kalesse M. Total Synthesis and Structure Revision of Halioxepine. Chemistry 2021; 27:1615-1619. [PMID: 33215739 PMCID: PMC7898713 DOI: 10.1002/chem.202004847] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 11/19/2020] [Indexed: 02/04/2023]
Abstract
The first total synthesis of halioxepine is accomplished using a 1,4-addition for constructing the quaternary center at C10 and a halo etherification for the generation of the tertiary ether at C7. The correct structure of halioxepine was determined by assembling different enantiomeric building blocks and by changing the relative configuration between C10 and C15.
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Affiliation(s)
- Caroline Poock
- Institute for Organic ChemistryGottfried Wilhelm Leibniz Universität HannoverSchneiderberg 1B30167HannoverGermany
| | - Markus Kalesse
- Institute for Organic ChemistryGottfried Wilhelm Leibniz Universität HannoverSchneiderberg 1B30167HannoverGermany
- Centre of Biomolecular Drug Research (BMWZ)Gottfried Wilhelm Leibniz Universität HannoverSchneiderberg 3830167HannoverGermany
- Helmholtz Centre for Infection Research (HZI)Inhoffenstrasse 738124BraunschweigGermany
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4
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Mannino MP, Demchenko AV. Synthesis of β-Glucosides with 3-O-Picoloyl-Protected Glycosyl Donors in the Presence of Excess Triflic Acid: Defining the Scope. Chemistry 2020; 26:2938-2946. [PMID: 31886911 DOI: 10.1002/chem.201905278] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Indexed: 11/08/2022]
Abstract
Excellent β-stereoselectivity for the glycosylation with glucosyl donors equipped with the 3-O-picoloyl (Pico) group, without the use of participating group, was achieved in the presence of NIS/excess TfOH promoter system. A complete investigation of the scope of this reaction was performed, revealing all important attributes of successful glycosylation. While altering the halogen source was tolerated, substitution of the triflate anion resulted in complete loss of stereoselectivity. Protonation of the Pico group was determined to be crucial in this reaction. The stability or extent of the protonated pyridine ring was also found to be another important key factor in obtaining high stereoselectivity. The nucleophilicity of the acceptor was found to be proportional to the stereoselectivity obtained, suggesting an SN 2-like mechanism.
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Affiliation(s)
- Michael P Mannino
- Department of Chemistry and Biochemistry, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri, 63121, USA
| | - Alexei V Demchenko
- Department of Chemistry and Biochemistry, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri, 63121, USA
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5
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Madduluri VR, Katari NK, Peddinti N, Prathap C, Burri DR, Kamaraju SRR, Jonnalagadda SB. Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst. Heliyon 2019; 5:e01212. [PMID: 30809597 PMCID: PMC6376155 DOI: 10.1016/j.heliyon.2019.e01212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 09/14/2018] [Accepted: 02/01/2019] [Indexed: 12/03/2022] Open
Abstract
Activated red brick (ARB) clay material proved superb catalyst for selective conversion of 1,5-pentanediol (1,5-PDO) to tetrahydropyran (THP) and 1,6-hexanediol (1,6-HDO) to oxepane (OP) via dehydration under vapor phase conditions in a continuous flow reactor. As per scanning electron microscopy (SEM), SEM-EDX and X-ray fluorescence (XRF) techniques, ARB clay catalyst majorly possessed silica (quartz), and iron oxide (hematite) species, and synergistic texture contributed to the catalytic efficiency for prolonged time-on-stream (TOS). The combination of active Lewis and Bronsted acidic sites with weak to mild acidic nature in the ARB clay obviously facilitates the dehydration reaction with high selectivity, tetrahydropyran (82%) and oxepane (89%). ARB clay displayed superior catalytic properties in the dehydration of alcohols compared with activities of commercial silica and α-Fe2O3 as catalysts. Commercial silica and α-Fe2O3 catalysts possessing the Lewis acidic sites only did not facilitate synchronous dehydration mechanism.
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Affiliation(s)
- Venkata Rao Madduluri
- Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Naresh Kumar Katari
- Department of Chemistry, GITAM School of Technology, GITAM Deemed to be University, HTP Campus, Rudraram, Medak, Telangana 502 329, India
- School of Chemistry & Physics, University of KwaZulu-Natal, P Bag X 54001, Durban 4000, South Africa
- Corresponding author.
| | - Nagaiah Peddinti
- Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Challa Prathap
- Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - David Raju Burri
- Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Seetha Rama Rao Kamaraju
- Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Sreekantha B. Jonnalagadda
- School of Chemistry & Physics, University of KwaZulu-Natal, P Bag X 54001, Durban 4000, South Africa
- Corresponding author.
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6
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Wen K, Wu Z, Chen B, Chen J, Zhang W. Pd(ii)-Catalyzed aerobic 1,2-difunctionalization of conjugated dienes: efficient synthesis of morpholines and 2-morpholones. Org Biomol Chem 2018; 16:5618-5625. [PMID: 30027979 DOI: 10.1039/c8ob01291a] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel and efficient methodology concerning the Pd(ii)-catalyzed intermolecular difunctionalization of conjugated dienes is reported to synthesize a series of functionalized morpholines and 2-morpholones. Widely distributed and easily obtained β-amino alcohols and α-amino acids, as starting nitrogen and oxygen sources, are successfully applied in the difunctionalization of conjugated dienes respectively. The majority of the desired products were obtained in moderate to excellent yields. Oxygen was successfully employed as a terminal oxidant. Further transformation of the generated products allowed for the expansion of structural diversity.
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Affiliation(s)
- Ke Wen
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P.R. China.
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7
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Zhou P, Cai Y, Zhong X, Luo W, Kang T, Li J, Liu X, Lin L, Feng X. Catalytic Asymmetric Intra- and Intermolecular Haloetherification of Enones: An Efficient Approach to (−)-Centrolobine. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02048] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Pengfei Zhou
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Yunfei Cai
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Xia Zhong
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Weiwei Luo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Tengfei Kang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Jun Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
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8
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Shigehisa H, Hayashi M, Ohkawa H, Suzuki T, Okayasu H, Mukai M, Yamazaki A, Kawai R, Kikuchi H, Satoh Y, Fukuyama A, Hiroya K. Catalytic Synthesis of Saturated Oxygen Heterocycles by Hydrofunctionalization of Unactivated Olefins: Unprotected and Protected Strategies. J Am Chem Soc 2016; 138:10597-604. [DOI: 10.1021/jacs.6b05720] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hiroki Shigehisa
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Miki Hayashi
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Haruna Ohkawa
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Tsuyoshi Suzuki
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Hiroki Okayasu
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Mayumi Mukai
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Ayaka Yamazaki
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Ryohei Kawai
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Harue Kikuchi
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Yui Satoh
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Akane Fukuyama
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Kou Hiroya
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi Nishitokyo-shi, Tokyo 202-8585, Japan
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9
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Selective oxidation of benzylic, allylic and propargylic alcohols using dirhodium(II) tetraamidinate as catalyst and aqueoustert-butyl hydroperoxide as oxidant. Appl Organomet Chem 2015. [DOI: 10.1002/aoc.3281] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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10
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E. McDonald F, L. Stoltz K, R. Alba AN, B. Wieliczko M, Bacsa J. Iodoetherification of Conformationally Restricted Dienyl Alcohols: Unexpected Formation of Oxocenes by 8-endo-mode Oxacyclizations. HETEROCYCLES 2014. [DOI: 10.3987/com-13-s(s)54] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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11
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Jana AK, Panda G. Stereoselective synthesis of Jaspine B and its C2 epimer from Garner aldehyde. RSC Adv 2013. [DOI: 10.1039/c3ra41778f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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12
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Snyder SA, Treitler DS, Brucks AP, Sattler W. A General Strategy for the Stereocontrolled Preparation of Diverse 8- and 9-Membered Laurencia-Type Bromoethers. J Am Chem Soc 2011; 133:15898-901. [DOI: 10.1021/ja2069449] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Scott A. Snyder
- Department of Chemistry, Columbia University, Havemeyer Hall, 3000 Broadway, New York, New York 10027, United States
| | - Daniel S. Treitler
- Department of Chemistry, Columbia University, Havemeyer Hall, 3000 Broadway, New York, New York 10027, United States
| | - Alexandria P. Brucks
- Department of Chemistry, Columbia University, Havemeyer Hall, 3000 Broadway, New York, New York 10027, United States
| | - Wesley Sattler
- Department of Chemistry, Columbia University, Havemeyer Hall, 3000 Broadway, New York, New York 10027, United States
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13
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Fuwa H, Ishigai K, Goto T, Suzuki A, Sasaki M. Synthetic studies on gambieric acids, potent antifungal polycyclic ether natural products: reassignment of the absolute configuration of the nonacyclic polyether core by NMR analysis of model compounds. J Org Chem 2009; 74:4024-40. [PMID: 19422179 DOI: 10.1021/jo900332q] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly stereocontrolled, convergent synthesis of the A/B-ring fragment of gambieric acids (GAs) has been developed on the basis of (i) a Suzuki-Miyaura coupling of the C1-C6 alkylborate and the C7-C17 vinyl iodide and (ii) a diastereoselective haloetherification for the construction of the A-ring tetrahydrofuran as key steps. Inspection of the (1)H and (13)C NMR chemical shifts of the synthesized A/B-ring model compounds led to a stereochemical reassignment of the absolute configuration of the polycyclic ether core of GAs. This structure revision was further supported by a synthesis of the A/BC-ring model compound of gambieric acid B and a comparison of its (1)H and (13)C NMR data with those of the natural product.
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Affiliation(s)
- Haruhiko Fuwa
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 1-1 Tsutsumidori-amamiya, Aoba-ku, Sendai 981-8555, Japan.
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14
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Hiebel MA, Pelotier B, Goekjian P, Piva O. 2,6-Disubstituted Tetrahydropyrans by Tandem Cross-Metathesis/Iodocyclisation. European J Org Chem 2008. [DOI: 10.1002/ejoc.200700902] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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Veliev MG, Sadygov OA, Alimardanov KM, Shatirova MI. Hypohalogenation of vinyl- and allylacetylenes and some chemical transformations of the products. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2007. [DOI: 10.1134/s1070428007110036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Su S, Porco JA. 1,2-Dihydroisoquinolines as Templates for Cascade Reactions To Access Isoquinoline Alkaloid Frameworks. Org Lett 2007; 9:4983-6. [DOI: 10.1021/ol702176h] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shun Su
- Department of Chemistry and Center for Chemical Methodology and Library Development (CMLD-BU), Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215
| | - John A. Porco
- Department of Chemistry and Center for Chemical Methodology and Library Development (CMLD-BU), Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215
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17
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Kumar V, Gauniyal HM, Shaw AK. An iodocyclization approach toward diastereoselective synthesis of highly functionalized tetrasubstituted tetrahydrofurans with 2,5-trans and 2,5-cis relationships from pyranoside derived acyclic oximes. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.08.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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de Quadras L, Stahl J, Zhuravlev F, Gladysz JA. Monophosphine and diphosphine ligands for diplatinum polyynediyl complexes: Efficient syntheses of new functionality-containing systems and model compounds. J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2006.12.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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20
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Bravo F, McDonald FE, Neiwert WA, Hardcastle KI. Alkene substituents for selective activation of endo-regioselective polyepoxide oxacyclizations. Org Lett 2006; 6:4487-9. [PMID: 15548057 DOI: 10.1021/ol048212e] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The presence of an alkenyl substituent on the terminal epoxide of a polyepoxide substrate enhances the yield of all-endo-regioselective tandem oxacyclization to trans-syn-trans-fused polycyclic ethers. For a substrate in which the epoxide and alkene functional groups are separated by two methylene substituents, a novel bromonium ion-induced endo-regioselective cyclization to bromooxepane is also described. [reaction: see text]
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Affiliation(s)
- Fernando Bravo
- Department of Chemistry, Emory University, Atlanta, GA 30322, USA
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21
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Rok Lee Y, Cheol Hwang J. Efficient Synthesis of Five- and Seven-Membered-Ring Heterocycles by Rhodium(II)-Catalyzed [3+2] and [3+4] Cycloaddition of Diazodicarbonyl Compounds with Conjugated Dienes. European J Org Chem 2005. [DOI: 10.1002/ejoc.200400452] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Stereoselective synthesis of 5-7 membered cyclic ethers by deiodonative ring-enlargement using hypervalent iodine reagents. Molecules 2005; 10:183-9. [PMID: 18007285 PMCID: PMC6147675 DOI: 10.3390/10010183] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2004] [Revised: 01/15/1995] [Accepted: 07/01/2004] [Indexed: 11/16/2022] Open
Abstract
Stereoselective synthesis of 5-7 membered cyclic ethers was achieved by deiodonative ring-enlargement of cyclic ethers having an iodoalkyl substituent. The reaction took place readily under mild conditions using hypervalent iodine compounds and an acetoxy or a trifluoroacetoxy group was introduced into the rings depending on the hypervalent iodine reagent employed. The use of hexafluoroisopropanol (HFIP) as solvent is critical.
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23
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Gao X, Snider BB. Syntheses of (-)-TAN-2483A, (-)-massarilactone B, and the fusidilactone B ring system. Revision of the structures of and syntheses of (+/-)-Waol A (FD-211) and (+/-)-Waol B (FD-212). J Org Chem 2004; 69:5517-27. [PMID: 15307719 DOI: 10.1021/jo0358628] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structure of waol A has been revised from 1 to 6, the vinylogue of TAN-2483A (5). Aldol reaction of hydroxybutanolides 13b,c with 2,4-hexadienal affords 12b,c, which are subjected to iodoetherification with bis(sym-collidine)IPF6 to provide 11b(c). Treatment with Et3N in CH2Cl2 completes the three-step syntheses of TAN-2483A (5) and waol A (6). Aldol reaction of hydroxybutanolide 31 with 2,4-hexadienal affords 32, which is subjected to iodoetherification to provide 34, which in turn is treated with Bu3SnCl, NaBH3CN, and oxygen to provide diol 60. Further elaboration completes the first syntheses of massarilactone B (7) and the fusidilactone B (9) ring system.
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Affiliation(s)
- Xiaolei Gao
- Department of Chemistry, Brandeis University, Waltham, Massachusetts 02454-9110, USA
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24
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Carreño MC, Des Mazery R, Urbano A, Colobert F, Solladié G. Enantioselective Access to 2,7-Cis-Disubstituted Oxepanes: Formal Synthesis of (+)-Isolaurepan. Org Lett 2003; 6:297-9. [PMID: 14723552 DOI: 10.1021/ol036299i] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] The asymmetric synthesis of 2,7-cis-disubstituted oxepanes bearing a sulfoxide is achieved from commercially available precursors in only five steps. The key step is the highly diastereoselective Et3SiH/TMSOTf-promoted reductive cyclization of enantiopure hydroxysulfinyl aryl or alkyl ketones.
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Affiliation(s)
- M Carmen Carreño
- Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049-Madrid, Spain.
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25
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Yus M, Ortiz R, Huerta FF. Intramolecular carbolithiation promoted by a DTBB-catalysed chlorine–lithium exchange. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.09.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Inagaki T, Nakamura Y, Sawaguchi M, Yoneda N, Ayuba S, Hara S. Fluorinative ring-expansion of cyclic ethers using p-iodotoluene difluoride. Stereoselective synthesis of fluoro cyclic ethers. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)00841-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Gao X, Nakadai M, Snider BB. Synthesis of (-)-TAN-2483A. Revision of the structures and syntheses of (+/-)-FD-211 (waol A) and (+/-)-FD-212 (waol B). Org Lett 2003; 5:451-4. [PMID: 12583741 DOI: 10.1021/ol0273405] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[structure: see text] The structure of waol A has been revised from 1 to 6, the vinylogue of TAN-2483 A (5). Aldol reaction of 10b(c) with 2,4-hexadienal (11) affords 9b(c), which is subjected to iodoetherification with bis(sym-collidine)IPF(6) to provide 8b(c). Treatment with Et(3)N in CH(2)Cl(2) completes three-step syntheses of TAN-2483A (5) and waol A (6).
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Affiliation(s)
- Xiaolei Gao
- Department of Chemistry, Brandeis University, Waltham, Massachusetts 02454-9110, USA
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Synthesis of novel macrocyclic peroxides by bis(sym-collidine)iodine (I) hexafluorophosphate-mediated cyclization of unsaturated hydroperoxides and unsaturated alcohols. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(02)01556-9] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Simart F, Brunel Y, Robin S, Rousseau G. A new method for the preparation of the 6,6 and 6,7 ring systems of bicyclic ethers. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(98)00833-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Homsi F, Rousseau G. Preparation of Medium-Ring Lactones and Lactams by Electrophilic Cyclizations. J Org Chem 1998. [DOI: 10.1021/jo980195h] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fadi Homsi
- Laboratoire des Carbocycles (Associé au CNRS), Institut de Chimie Moléculaire d’Orsay Bât. 420, Université de Paris-Sud, 91405 Orsay, France
| | - Gérard Rousseau
- Laboratoire des Carbocycles (Associé au CNRS), Institut de Chimie Moléculaire d’Orsay Bât. 420, Université de Paris-Sud, 91405 Orsay, France
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Hoberg JO. Formation of Seven-Membered Oxacycles through Ring Expansion of Cyclopropanated Carbohydrates. J Org Chem 1997. [DOI: 10.1021/jo970649v] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- John O. Hoberg
- National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401
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