1
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Weber A, Breugst M, Pietruszka J. Experimental and Computational Investigations of the Reactions between α,β-Unsaturated Lactones and 1,3-Dienes by Cooperative Lewis Acid/Brønsted Acid Catalysis. Angew Chem Int Ed Engl 2020; 59:18709-18716. [PMID: 32567075 PMCID: PMC7589441 DOI: 10.1002/anie.202008365] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Indexed: 12/02/2022]
Abstract
The reactions of α,β-unsaturated δ-lactones with activated dienes such as 1,3-dimethoxy-1-[(trimethylsilyl)oxy]-1,3-butadiene (Brassard's diene) are barely known in literature and show high potential for the synthesis of isocoumarin moieties. An in-depth investigation of this reaction proved a stepwise mechanism via the vinylogous Michael-products. Subsequent cyclisation and oxidation by LHMDS and DDQ, respectively, provided six mellein derivatives (30-84 %) and four angelicoin derivatives (40-78 %) over three steps. DFT-calculations provide insights into the reaction mechanism and support the theory of a stepwise reaction.
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Affiliation(s)
- Anja Weber
- Institut für Bioorganische ChemieHeinrich-Heine-Universität Düsseldorf im Forschungszentrum JülichStetternicher Forst, Geb. 15.852426JülichGermany
| | - Martin Breugst
- Department für ChemieUniversität zu KölnGreinstraße 450939KölnGermany
| | - Jörg Pietruszka
- Institut für Bioorganische ChemieHeinrich-Heine-Universität Düsseldorf im Forschungszentrum JülichStetternicher Forst, Geb. 15.852426JülichGermany
- Institut für Bio- und Geowissenschaften: Biotechnologie (IBG-1)Forschungszentrum Jülich GmbH52428JülichGermany
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2
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Weber A, Breugst M, Pietruszka J. Experimental and Computational Investigations of the Reactions between α,β‐Unsaturated Lactones and 1,3‐Dienes by Cooperative Lewis Acid/Brønsted Acid Catalysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Anja Weber
- Institut für Bioorganische Chemie Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich Stetternicher Forst, Geb. 15.8 52426 Jülich Germany
| | - Martin Breugst
- Department für Chemie Universität zu Köln Greinstraße 4 50939 Köln Germany
| | - Jörg Pietruszka
- Institut für Bioorganische Chemie Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich Stetternicher Forst, Geb. 15.8 52426 Jülich Germany
- Institut für Bio- und Geowissenschaften: Biotechnologie (IBG-1) Forschungszentrum Jülich GmbH 52428 Jülich Germany
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3
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Huang Q, Michalland J, Zard SZ. Alternating Radical Stabilities: A Convergent Route to Terminal and Internal Boronates. Angew Chem Int Ed Engl 2019; 58:16936-16942. [DOI: 10.1002/anie.201906497] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Qi Huang
- Laboratoire de Synthèse Organique, CNRS UMR 7652Ecole polytechnique Route de Saclay 91128 Palaiseau Cedex France
| | - Jean Michalland
- Laboratoire de Synthèse Organique, CNRS UMR 7652Ecole polytechnique Route de Saclay 91128 Palaiseau Cedex France
| | - Samir Z. Zard
- Laboratoire de Synthèse Organique, CNRS UMR 7652Ecole polytechnique Route de Saclay 91128 Palaiseau Cedex France
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4
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Huang Q, Michalland J, Zard SZ. Alternating Radical Stabilities: A Convergent Route to Terminal and Internal Boronates. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906497] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Qi Huang
- Laboratoire de Synthèse Organique, CNRS UMR 7652Ecole polytechnique Route de Saclay 91128 Palaiseau Cedex France
| | - Jean Michalland
- Laboratoire de Synthèse Organique, CNRS UMR 7652Ecole polytechnique Route de Saclay 91128 Palaiseau Cedex France
| | - Samir Z. Zard
- Laboratoire de Synthèse Organique, CNRS UMR 7652Ecole polytechnique Route de Saclay 91128 Palaiseau Cedex France
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5
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Sachs J, Döhl K, Weber A, Bonus M, Ehlers F, Fleischer E, Klinger A, Gohlke H, Pietruszka J, Schmitt L, Teusch N. Novel 3,4-Dihydroisocoumarins Inhibit Human P-gp and BCRP in Multidrug Resistant Tumors and Demonstrate Substrate Inhibition of Yeast Pdr5. Front Pharmacol 2019; 10:400. [PMID: 31040786 PMCID: PMC6476959 DOI: 10.3389/fphar.2019.00400] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 04/01/2019] [Indexed: 12/15/2022] Open
Abstract
Multidrug resistance (MDR) in tumors and pathogens remains a major problem in the efficacious treatment of patients by reduction of therapy options and subsequent treatment failure. Various mechanisms are described to be involved in the development of MDR with overexpression of ATP-binding cassette (ABC) transporters reflecting the most extensively studied. These membrane transporters translocate a wide variety of substrates utilizing energy from ATP hydrolysis leading to decreased intracellular drug accumulation and impaired drug efficacy. One treatment strategy might be inhibition of transporter-mediated efflux by small molecules. Isocoumarins and 3,4-dihydroisocoumarins are a large group of natural products derived from various sources with great structural and functional variety, but have so far not been in the focus as potential MDR reversing agents. Thus, three natural products and nine novel 3,4-dihydroisocoumarins were designed and analyzed regarding cytotoxicity induction and inhibition of human ABC transporters P-glycoprotein (P-gp), multidrug resistance-associated protein 1 (MRP1) and breast cancer resistance protein (BCRP) in a variety of human cancer cell lines as well as the yeast ABC transporter Pdr5 in Saccharomyces cerevisiae. Dual inhibitors of P-gp and BCRP and inhibitors of Pdr5 were identified, and distinct structure-activity relationships for transporter inhibition were revealed. The strongest inhibitor of P-gp and BCRP, which inhibited the transporters up to 80 to 90% compared to the respective positive controls, demonstrated the ability to reverse chemotherapy resistance in resistant cancer cell lines up to 5.6-fold. In the case of Pdr5, inhibitors were identified that prevented substrate transport and/or ATPase activity with IC50 values in the low micromolar range. However, cell toxicity was not observed. Molecular docking of the test compounds to P-gp revealed that differences in inhibition capacity were based on different binding affinities to the transporter. Thus, these small molecules provide novel lead structures for further optimization.
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Affiliation(s)
- Julia Sachs
- Bio-Pharmaceutical Chemistry and Molecular Pharmacology, Faculty of Applied Natural Sciences, Technische Hochschule Köln, Leverkusen, Germany
| | - Katja Döhl
- Institute of Biochemistry, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Anja Weber
- Institute of Bioorganic Chemistry, Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich, Jülich, Germany
| | - Michele Bonus
- Institute for Pharmaceutical and Medicinal Chemistry, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Ferdinand Ehlers
- Bio-Pharmaceutical Chemistry and Molecular Pharmacology, Faculty of Applied Natural Sciences, Technische Hochschule Köln, Leverkusen, Germany
| | | | | | - Holger Gohlke
- Institute for Pharmaceutical and Medicinal Chemistry, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany.,John von Neumann Institute for Computing, Jülich Supercomputing Centre and Institute for Complex Systems - Structural Biochemistry, Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Jörg Pietruszka
- Institute of Bioorganic Chemistry, Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich, Jülich, Germany.,IBG-1: Biotechnology, Forschungszentrum Jülich, Jülich, Germany
| | - Lutz Schmitt
- Institute of Biochemistry, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Nicole Teusch
- Bio-Pharmaceutical Chemistry and Molecular Pharmacology, Faculty of Applied Natural Sciences, Technische Hochschule Köln, Leverkusen, Germany
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6
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Tekle-Smith MA, Williamson KS, Hughes IF, Leighton JL. Direct, Mild, and General n-Bu 4NBr-Catalyzed Aldehyde Allylsilylation with Allyl Chlorides. Org Lett 2018; 19:6024-6027. [PMID: 29068688 DOI: 10.1021/acs.orglett.7b03193] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A direct, mild, and general method for the enantioselective allylsilylation of aldehydes with allyl chlorides is reported. The reactions are effectively catalyzed by 5 mol % of n-Bu4NBr, and this rate acceleration allows the use of complex allyl donors in fragment-coupling reactions and of electron-deficient allyl donors. The results are (1) significant progress toward a "universal" asymmetric aldehyde allylation reaction that can reliably and highly stereoselectively couple any allyl chloride_aldehyde combination and (2) the discovery of a novel mode of nucleophilic catalysis for aldehyde allylsilylation reactions.
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Affiliation(s)
- Makeda A Tekle-Smith
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Kevin S Williamson
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Isaac F Hughes
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - James L Leighton
- Department of Chemistry, Columbia University , New York, New York 10027, United States
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7
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Zhao J, Jonker SJT, Meyer DN, Schulz G, Tran CD, Eriksson L, Szabó KJ. Copper-catalyzed synthesis of allenylboronic acids. Access to sterically encumbered homopropargylic alcohols and amines by propargylboration. Chem Sci 2018; 9:3305-3312. [PMID: 29732108 PMCID: PMC5915797 DOI: 10.1039/c7sc05123a] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 02/17/2018] [Indexed: 12/21/2022] Open
Abstract
Tri- and tetrasubstituted allenylboronic acids were prepared via a new versatile copper-catalyzed methodology. The densely functionalized allenylboronic acids readily undergo propargylboration reactions with ketones and imines without any additives. Catalytic asymmetric propargylborylation of ketones is demonstrated with high stereoselectivity allowing for the synthesis of highly enantioenriched tertiary homopropargyl alcohols. The reaction is suitable for kinetic resolution of racemic allenylboronic acids affording alkynes with adjacent quaternary stereocenters.
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Affiliation(s)
- Jian Zhao
- Department of Organic Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden .
| | - Sybrand J T Jonker
- Department of Organic Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden .
| | - Denise N Meyer
- Department of Organic Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden .
| | - Göran Schulz
- Department of Organic Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden .
| | - C Duc Tran
- Department of Organic Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden .
| | - Lars Eriksson
- Department of Materials and Environmental Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden
| | - Kálmán J Szabó
- Department of Organic Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden .
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8
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Xuan Q, Wei Y, Chen J, Song Q. An expedient E-stereoselective synthesis of multi-substituted functionalized allylic boronates from Morita–Baylis–Hillman alcohols. Org Chem Front 2017. [DOI: 10.1039/c7qo00253j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Various functionalized tri-substituted allylic boronates were synthesized through borylation of Morita–Baylis–Hillman alcohols under the catalysis of Cu(OTf)2 at ambient temperature.
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Affiliation(s)
- Qingqing Xuan
- Institute of Next Generation Matter Transformation
- College of Chemical Engineering at Huaqiao University
- Xiamen
- China
| | - Yahui Wei
- Institute of Next Generation Matter Transformation
- College of Chemical Engineering at Huaqiao University
- Xiamen
- China
| | | | - Qiuling Song
- Institute of Next Generation Matter Transformation
- College of Chemical Engineering at Huaqiao University
- Xiamen
- China
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9
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Diner C, Szabó KJ. Recent Advances in the Preparation and Application of Allylboron Species in Organic Synthesis. J Am Chem Soc 2016; 139:2-14. [DOI: 10.1021/jacs.6b10017] [Citation(s) in RCA: 189] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Colin Diner
- Department of Organic Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Kálmán J. Szabó
- Department of Organic Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
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10
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Gehrke Y, Berg CA, Vahabi R, Pietruszka J. Synthesis of Alkenylboronic Esters: An Alternative Route to Trisubstituted Homoallylic Alcohols. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600139] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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11
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Brauns M, Muller F, Gülden D, Böse D, Frey W, Breugst M, Pietruszka J. Enantioselective Catalysts for the Synthesis of α-Substituted Allylboronates-An Accelerated Approach towards Isomerically Pure Homoallylic Alcohols. Angew Chem Int Ed Engl 2015; 55:1548-52. [DOI: 10.1002/anie.201509198] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Marcus Brauns
- Institut für Bioorganische Chemie der; Heinrich-Heine-Universität Düsseldorf im; Forschungszentrum Jülich; Stetternicher Forst, Geb. 15.8 52426 Jülich Germany
| | - Frédéric Muller
- Department für Chemie; Universität zu Köln; Greinstrasse 4 50939 Köln Germany
| | - Daniel Gülden
- Institut für Bio- und Geowissenschaften (IBG-1: Biotechnologie); Forschungszentrum Jülich; 52428 Jülich Germany
| | - Dietrich Böse
- Institut für Bioorganische Chemie der; Heinrich-Heine-Universität Düsseldorf im; Forschungszentrum Jülich; Stetternicher Forst, Geb. 15.8 52426 Jülich Germany
| | - Wolfgang Frey
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Martin Breugst
- Department für Chemie; Universität zu Köln; Greinstrasse 4 50939 Köln Germany
| | - Jörg Pietruszka
- Institut für Bioorganische Chemie der; Heinrich-Heine-Universität Düsseldorf im; Forschungszentrum Jülich; Stetternicher Forst, Geb. 15.8 52426 Jülich Germany
- Institut für Bio- und Geowissenschaften (IBG-1: Biotechnologie); Forschungszentrum Jülich; 52428 Jülich Germany
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12
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Brauns M, Muller F, Gülden D, Böse D, Frey W, Breugst M, Pietruszka J. Enantioselektive Katalysatoren zur Synthese von α-substituierten Allylboronsäureestern - ein effizienter Zugang zu isomerenreinen Homoallylalkoholen. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201509198] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Marcus Brauns
- Institut für Bioorganische Chemie der; Heinrich-Heine-Universität Düsseldorf im; Forschungszentrum Jülich; Stetternicher Forst, Geb. 15.8 52426 Jülich Deutschland
| | - Frédéric Muller
- Department für Chemie; Universität zu Köln; Greinstraße 4 50939 Köln Deutschland
| | - Daniel Gülden
- Institut für Bio- und Geowissenschaften (IBG-1: Biotechnologie); Forschungszentrum Jülich; 52428 Jülich Deutschland
| | - Dietrich Böse
- Institut für Bioorganische Chemie der; Heinrich-Heine-Universität Düsseldorf im; Forschungszentrum Jülich; Stetternicher Forst, Geb. 15.8 52426 Jülich Deutschland
| | - Wolfgang Frey
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Martin Breugst
- Department für Chemie; Universität zu Köln; Greinstraße 4 50939 Köln Deutschland
| | - Jörg Pietruszka
- Institut für Bioorganische Chemie der; Heinrich-Heine-Universität Düsseldorf im; Forschungszentrum Jülich; Stetternicher Forst, Geb. 15.8 52426 Jülich Deutschland
- Institut für Bio- und Geowissenschaften (IBG-1: Biotechnologie); Forschungszentrum Jülich; 52428 Jülich Deutschland
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13
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Zhao J, Szabó KJ. Catalytic Borylative Opening of Propargyl Cyclopropane, Epoxide, Aziridine, and Oxetane Substrates: Ligand Controlled Synthesis of Allenyl Boronates and Alkenyl Diboronates. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201510132] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Jian Zhao
- Department of Organic Chemistry; Stockholm University; Sweden
| | - Kálmán J. Szabó
- Department of Organic Chemistry; Stockholm University; Sweden
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14
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Zhao J, Szabó KJ. Catalytic Borylative Opening of Propargyl Cyclopropane, Epoxide, Aziridine, and Oxetane Substrates: Ligand Controlled Synthesis of Allenyl Boronates and Alkenyl Diboronates. Angew Chem Int Ed Engl 2015; 55:1502-6. [PMID: 26663468 PMCID: PMC4736465 DOI: 10.1002/anie.201510132] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Indexed: 11/21/2022]
Abstract
A new copper‐catalyzed reaction for the stereo‐ and regioselective synthesis of alkenyl diboronates and allenyl boronates is presented. In this process propargyl derivatives of strained three/four‐membered rings were employed as substrates and B2pin2 was used as the boronate source. Selective formation of the alkenyl diboronate versus the allenyl boronate products was controlled by the choice of phosphine ligand.
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Affiliation(s)
- Jian Zhao
- Department of Organic Chemistry, Stockholm University, Sweden
| | - Kálmán J Szabó
- Department of Organic Chemistry, Stockholm University, Sweden.
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15
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Das A, Wang D, Belhomme MC, Szabó KJ. Copper-Catalyzed Cross-Coupling of Allylboronic Acids with α-Diazoketones. Org Lett 2015; 17:4754-7. [DOI: 10.1021/acs.orglett.5b02285] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arindam Das
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
| | - Dong Wang
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
| | - Marie-Charlotte Belhomme
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
| | - Kálmán J. Szabó
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
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16
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Eichenauer NC, Nordschild ACM, Bischop M, Schumacher D, Mackwitz MKW, Tschersich R, Wilhelm T, Pietruszka J. Total Synthesis of Solandelactones A and B. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500700] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Zhao TSN, Zhao J, Szabó KJ. Stereoselective Synthesis of 1,4-Diols by a Tandem Allylboration–Allenylboration Sequence. Org Lett 2015; 17:2290-3. [DOI: 10.1021/acs.orglett.5b01048] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tony S. N. Zhao
- Department
of Organic Chemistry, Stockholm University, SE-106 91, Stockholm, Sweden
| | - Jian Zhao
- Department
of Organic Chemistry, Stockholm University, SE-106 91, Stockholm, Sweden
| | - Kálmán J. Szabó
- Department
of Organic Chemistry, Stockholm University, SE-106 91, Stockholm, Sweden
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18
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Affiliation(s)
- Hong-Ping Deng
- Department of Organic
Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Dong Wang
- Department of Organic
Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Kálmán J. Szabó
- Department of Organic
Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
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19
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Hoang GL, Yang ZD, Smith SM, Pal R, Miska JL, Pérez DE, Pelter LSW, Zeng XC, Takacs JM. Enantioselective desymmetrization via carbonyl-directed catalytic asymmetric hydroboration and Suzuki-Miyaura cross-coupling. Org Lett 2015; 17:940-3. [PMID: 25642639 DOI: 10.1021/ol503764d] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The rhodium-catalyzed enantioselective desymmetrization of symmetric γ,δ-unsaturated amides via carbonyl-directed catalytic asymmetric hydroboration (directed CAHB) affords chiral secondary organoboronates with up to 98% ee. The chiral γ-borylated products undergo palladium-catalyzed Suzuki-Miyaura cross-coupling via the trifluoroborate salt with stereoretention.
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Affiliation(s)
- Gia L Hoang
- Department of Chemistry, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States
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20
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Xie JS, Hu XY, Shan ZX, Zhou ZQ. A Straightforward and Practical Approach to Chiral Inducer: (2R,3R)-1,4-Dimethoxy-1,1,4,4-tetraphenylbutane-2,3-diol. Aust J Chem 2015. [DOI: 10.1071/ch14505] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A straightforward and practical access to chiral inducer (2R,3R)-1,4- dimethoxyl-1,1,4,4-tetraphenyl-2,3-diol has been developed. It is based on highly regioselective 2,3-cyclosulfitation of (2R,3R)-1,1,4,4-tetraphenyl-butanetetraol, in which selective protection of the secondary hydroxyls and chlorination of the tertiary hydroxyls of (2R,3R)-1,1,4,4-tetraphenyl-butanetetraol are accomplished via one step. In the preparation, methanol was used as a methylating reagent and common alkali liquor was used for cleavage of the protection group. It may be one of the most straightforward and practical syntheses of the title compound.
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21
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Westcott SA, Fernández E. Singular Metal Activation of Diboron Compounds. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2015. [DOI: 10.1016/bs.adomc.2015.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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22
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Das A, Alam R, Eriksson L, Szabó KJ. Stereocontrol in Synthesis of Homoallylic Amines. Syn Selective Direct Allylation of Hydrazones with Allylboronic Acids. Org Lett 2014; 16:3808-11. [DOI: 10.1021/ol501699x] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Arindam Das
- Department of Organic Chemistry, ‡Department of Inorganic
and Structural Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Rauful Alam
- Department of Organic Chemistry, ‡Department of Inorganic
and Structural Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Lars Eriksson
- Department of Organic Chemistry, ‡Department of Inorganic
and Structural Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Kálmán J. Szabó
- Department of Organic Chemistry, ‡Department of Inorganic
and Structural Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
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