1
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Li P, Ren H, Liu D, Yan D, Tang W, Yan Y. Poly(phenylene sulfide) Containing Boron in the Main Chain for Shield Thermal Neutron. ChemistrySelect 2021. [DOI: 10.1002/slct.202102751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Pengcheng Li
- College of physics Sichuan University Sichuan 610065 China
| | - Haohao Ren
- College of physics Sichuan University Sichuan 610065 China
| | - Dong Liu
- Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621999 China
| | - Dawei Yan
- College of physics Sichuan University Sichuan 610065 China
| | - Wanli Tang
- College of physics Sichuan University Sichuan 610065 China
| | - Yonggang Yan
- College of physics Sichuan University Sichuan 610065 China
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2
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Adamson C, Kajino H, Kawashima SA, Yamatsugu K, Kanai M. Live-Cell Protein Modification by Boronate-Assisted Hydroxamic Acid Catalysis. J Am Chem Soc 2021; 143:14976-14980. [PMID: 34506708 DOI: 10.1021/jacs.1c07060] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Selective methods for introducing protein post-translational modifications (PTMs) within living cells have proven valuable for interrogating their biological function. In contrast to enzymatic methods, abiotic catalysis should offer access to diverse and new-to-nature PTMs. Herein, we report the boronate-assisted hydroxamic acid (BAHA) catalyst system, which comprises a protein ligand, a hydroxamic acid Lewis base, and a diol moiety. In concert with a boronic acid-bearing acyl donor, our catalyst leverages a local molarity effect to promote acyl transfer to a target lysine residue. Our catalyst system employs micromolar reagent concentrations and affords minimal off-target protein reactivity. Critically, BAHA is resistant to glutathione, a metabolite which has hampered many efforts toward abiotic chemistry within living cells. To showcase this methodology, we installed a variety of acyl groups in E. coli dihydrofolate reductase expressed within human cells. Our results further establish the well-known boronic acid-diol complexation as a bona fide bio-orthogonal reaction with applications in chemical biology and in-cell catalysis.
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Affiliation(s)
- Christopher Adamson
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan, 113-0033
| | - Hidetoshi Kajino
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan, 113-0033
| | - Shigehiro A Kawashima
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan, 113-0033
| | - Kenzo Yamatsugu
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan, 113-0033
| | - Motomu Kanai
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan, 113-0033
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3
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Inglesby PA, Agnew LR, Carter HL, Ring OT. Diethanolamine Boronic Esters: Development of a Simple and Standard Process for Boronic Ester Synthesis. Org Process Res Dev 2020. [DOI: 10.1021/acs.oprd.0c00296] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Phillip A. Inglesby
- Chemical Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield SK10 2NA, U.K
| | - Lauren R. Agnew
- Chemical Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield SK10 2NA, U.K
| | - Holly L. Carter
- Chemical Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield SK10 2NA, U.K
| | - Oliver T. Ring
- Chemical Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield SK10 2NA, U.K
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4
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Tappin NDC, Michalska W, Rohrbach S, Renaud P. Cyclopropanation of Terminal Alkenes through Sequential Atom‐Transfer Radical Addition/1,3‐Elimination. Angew Chem Int Ed Engl 2019; 58:14240-14244. [DOI: 10.1002/anie.201907962] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Indexed: 12/12/2022]
Affiliation(s)
- Nicholas D. C. Tappin
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 CH-3012 Bern Switzerland
| | - Weronika Michalska
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 CH-3012 Bern Switzerland
| | - Simon Rohrbach
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 CH-3012 Bern Switzerland
| | - Philippe Renaud
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 CH-3012 Bern Switzerland
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5
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Tappin NDC, Michalska W, Rohrbach S, Renaud P. Cyclopropanation of Terminal Alkenes through Sequential Atom‐Transfer Radical Addition/1,3‐Elimination. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907962] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Nicholas D. C. Tappin
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 CH-3012 Bern Switzerland
| | - Weronika Michalska
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 CH-3012 Bern Switzerland
| | - Simon Rohrbach
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 CH-3012 Bern Switzerland
| | - Philippe Renaud
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 CH-3012 Bern Switzerland
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6
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McConnell CR, Haeffner F, Baggett AW, Liu SY. 1,2-Azaborine's Distinct Electronic Structure Unlocks Two New Regioisomeric Building Blocks via Resolution Chemistry. J Am Chem Soc 2019; 141:9072-9078. [PMID: 31082254 PMCID: PMC6609151 DOI: 10.1021/jacs.9b03611] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Two new 1,2-azaborine building blocks that enable the broad diversification of previously not readily accessible C4 and C5 ring positions of the 1,2-azaborine heterocycle are developed. 1,2-Azaborine's distinct electronic structure allowed the resolution of a mixture of C4- and C5-borylated 1,2-azaborines. The connection between the electronic structure of C4 and C5 positions of 1,2-azaborine and their distinct reactivity patterns is revealed by a combination of reactivity studies and kinetic measurements that are supported by DFT calculations. Specifically, we show that oxidation by N-methylmorpholine N-oxide (NMO) is selective for the C4-borylated 1,2-azaborine, and the Ir-catalyzed deborylation is selective for the C5-borylated 1,2-azaborine via kinetically controlled processes. On the other hand, ligand exchange with diethanolamine takes place selectively with the C4-borylated isomer via a thermodynamically controlled process. These results represent the first examples for chemically distinguishing a mixture of two aryl mono-Bpin-substituted isomers.
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Affiliation(s)
- Cameron R. McConnell
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Fredrik Haeffner
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | | | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
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7
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Meyer D, Renaud P. Enantioselective Hydroazidation of Trisubstituted Non-Activated Alkenes. Angew Chem Int Ed Engl 2017; 56:10858-10861. [DOI: 10.1002/anie.201703340] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 05/24/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Daniel Meyer
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Philippe Renaud
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
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8
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Meyer D, Renaud P. Enantioselective Hydroazidation of Trisubstituted Non-Activated Alkenes. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703340] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Daniel Meyer
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Philippe Renaud
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
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9
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Röttger M, Domenech T, van der Weegen R, Breuillac A, Nicolaÿ R, Leibler L. High-performance vitrimers from commodity thermoplastics through dioxaborolane metathesis. Science 2017; 356:62-65. [DOI: 10.1126/science.aah5281] [Citation(s) in RCA: 614] [Impact Index Per Article: 87.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Revised: 02/07/2017] [Accepted: 03/08/2017] [Indexed: 01/19/2023]
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10
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Molloy JJ, Clohessy TA, Irving C, Anderson NA, Lloyd-Jones GC, Watson AJB. Chemoselective oxidation of aryl organoboron systems enabled by boronic acid-selective phase transfer. Chem Sci 2017; 8:1551-1559. [PMID: 28572912 PMCID: PMC5452267 DOI: 10.1039/c6sc04014d] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 10/25/2016] [Indexed: 01/24/2023] Open
Abstract
We report the direct chemoselective Brown-type oxidation of aryl organoboron systems containing two oxidizable boron groups. Basic biphasic reaction conditions enable selective formation and phase transfer of a boronic acid trihydroxyboronate in the presence of boronic acid pinacol (BPin) esters, while avoiding speciation equilibria. Spectroscopic investigations validate a base-promoted phase-selective discrimination of organoboron species. This phenomenon is general across a broad range of organoboron compounds and can also be used to invert conventional protecting group strategies, enabling chemoselective oxidation of BMIDA species over normally more reactive BPin substrates. We also demonstrate the selective oxidation of diboronic acid systems with chemoselectivity predictable a priori. The utility of this method is exemplified through the development of a chemoselective oxidative nucleophile coupling.
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Affiliation(s)
- John J Molloy
- Department of Pure and Applied Chemistry , WestCHEM , University of Strathclyde , 295 Cathedral Street , Glasgow , G1 1XL , UK .
| | - Thomas A Clohessy
- Department of Pure and Applied Chemistry , WestCHEM , University of Strathclyde , 295 Cathedral Street , Glasgow , G1 1XL , UK .
- GlaxoSmithKline , Medicines Research Centre , Gunnels Wood Road , Stevenage , SG1 2NY , UK
| | - Craig Irving
- Department of Pure and Applied Chemistry , WestCHEM , University of Strathclyde , 295 Cathedral Street , Glasgow , G1 1XL , UK .
| | - Niall A Anderson
- GlaxoSmithKline , Medicines Research Centre , Gunnels Wood Road , Stevenage , SG1 2NY , UK
| | - Guy C Lloyd-Jones
- School of Chemistry , University of Edinburgh West Mains Road , Edinburgh , EH9 3JJ , UK
| | - Allan J B Watson
- Department of Pure and Applied Chemistry , WestCHEM , University of Strathclyde , 295 Cathedral Street , Glasgow , G1 1XL , UK .
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11
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Masuda K, Nagatomo M, Inoue M. Chemical Conversion of Ryanodol to Ryanodine. Chem Pharm Bull (Tokyo) 2016; 64:874-9. [PMID: 27010543 DOI: 10.1248/cpb.c16-00214] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ryanodine (1) is a plant-derived natural product with powerful pharmacological and insecticidal action, and is a potent modulator of intracellular calcium release channels. Compound 1 possesses a 1H-pyrrole-2-carboxylate ester at the C3-position of heptahydroxylated terpenoid ryanodol (2). Whereas 2 was readily obtained from 1 by basic hydrolysis, 1 has never been synthesized from 2, due to the extreme difficulty in selectively introducing the bulky pyrrole moiety at the severely hindered C3-hydroxyl group of heptaol 2. Here we report chemical conversion of 2 to 1 for the first time. The derivatization was realized through the use of a new protective group strategy and the application of on-site construction of the pyrrole-2-carboxylate ester from the glycine ester and 1,3-bis(dimethylamino)allylium tetrafluoroborate.
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Affiliation(s)
- Kengo Masuda
- Graduate School of Pharmaceutical Sciences, The University of Tokyo
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12
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Determination of endogenous brassinosteroids using sequential magnetic solid phase extraction followed by in situ derivatization/desorption method coupled with liquid chromatography–tandem mass spectrometry. J Chromatogr A 2016; 1446:103-13. [DOI: 10.1016/j.chroma.2016.04.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 03/31/2016] [Accepted: 04/04/2016] [Indexed: 01/12/2023]
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13
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Akgun B, Hall DG. Fast and Tight Boronate Formation for Click Bioorthogonal Conjugation. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510321] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Burcin Akgun
- Department of Chemistry, 4-010 CCIS; University of Alberta; Edmonton Alberta T6G 2G2 Canada
| | - Dennis G. Hall
- Department of Chemistry, 4-010 CCIS; University of Alberta; Edmonton Alberta T6G 2G2 Canada
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14
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Akgun B, Hall DG. Fast and Tight Boronate Formation for Click Bioorthogonal Conjugation. Angew Chem Int Ed Engl 2016; 55:3909-13. [PMID: 26913832 DOI: 10.1002/anie.201510321] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Indexed: 11/07/2022]
Abstract
A new click bioorthogonal reaction system was devised to enable the fast ligation (k(ON) ≈340 m(-1) s(-1)) of conjugatable derivatives of a rigid cyclic diol (nopoldiol) and a carefully optimized boronic acid partner, 2-methyl-5-carboxymethylphenylboronic acid. Using NMR and fluorescence spectroscopy studies, the corresponding boronates were found to form reversibly within minutes at low micromolar concentration in water, providing submicromolar equilibrium constant (K(eq) ≈10(5) -10(6) m(-1)). Efficient protein conjugation under physiological conditions was demonstrated with model proteins thioredoxin and albumin, and characterized by mass spectrometry and gel electrophoresis.
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Affiliation(s)
- Burcin Akgun
- Department of Chemistry, 4-010 CCIS, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
| | - Dennis G Hall
- Department of Chemistry, 4-010 CCIS, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada.
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15
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Barbato KS, Luan Y, Ramella D, Panek JS, Schaus SE. Enantioselective Multicomponent Condensation Reactions of Phenols, Aldehydes, and Boronates Catalyzed by Chiral Biphenols. Org Lett 2015; 17:5812-5. [PMID: 26576776 PMCID: PMC4671505 DOI: 10.1021/acs.orglett.5b02954] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Chiral diols and biphenols catalyze the multicomponent condensation reaction of phenols, aldehydes, and alkenyl or aryl boronates. The condensation products are formed in good yields and enantioselectivities. The reaction proceeds via an initial Friedel-Crafts alkylation of the aldehyde and phenol to yield an ortho-quinone methide that undergoes an enantioselective boronate addition. A cyclization pathway was discovered while exploring the scope of the reaction that provides access to chiral 2,4-diaryl chroman products, the core of which is a structural motif found in natural products.
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Affiliation(s)
- Keith S Barbato
- Center for Molecular Discovery, Boston University , 24 Cummington Mall, Boston, Massachusetts 02215, United States
| | - Yi Luan
- Center for Molecular Discovery, Boston University , 24 Cummington Mall, Boston, Massachusetts 02215, United States
| | - Daniele Ramella
- Center for Molecular Discovery, Boston University , 24 Cummington Mall, Boston, Massachusetts 02215, United States
| | - James S Panek
- Center for Molecular Discovery, Boston University , 24 Cummington Mall, Boston, Massachusetts 02215, United States
| | - Scott E Schaus
- Center for Molecular Discovery, Boston University , 24 Cummington Mall, Boston, Massachusetts 02215, United States
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16
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Ashley JD, Stefanick JF, Schroeder VA, Suckow MA, Kiziltepe T, Bilgicer B. Liposomal Bortezomib Nanoparticles via Boronic Ester Prodrug Formulation for Improved Therapeutic Efficacy in Vivo. J Med Chem 2014; 57:5282-92. [DOI: 10.1021/jm500352v] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jonathan D. Ashley
- Department
of Chemical and Biomolecular Engineering, University of Notre Dame, Notre
Dame, 182 Fitzpatrick Hall, Indiana 46556, United States
| | - Jared F. Stefanick
- Department
of Chemical and Biomolecular Engineering, University of Notre Dame, Notre
Dame, 182 Fitzpatrick Hall, Indiana 46556, United States
| | - Valerie A. Schroeder
- Department
of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556, United States
- Freimann
Life Science Center, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Mark A. Suckow
- Department
of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556, United States
- Freimann
Life Science Center, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Tanyel Kiziltepe
- Department
of Chemical and Biomolecular Engineering, University of Notre Dame, Notre
Dame, 182 Fitzpatrick Hall, Indiana 46556, United States
- Advanced
Diagnostics and Therapeutics, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Basar Bilgicer
- Department
of Chemical and Biomolecular Engineering, University of Notre Dame, Notre
Dame, 182 Fitzpatrick Hall, Indiana 46556, United States
- Advanced
Diagnostics and Therapeutics, University of Notre Dame, Notre Dame, Indiana 46556, United States
- Department
of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
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17
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Stefani HA, Khan AN, Manarin F, Vendramini PH, Eberlin MN. Synthesis of α-alkenyl-α-amino esters via addition of potassium Alkenyltrifluoroborate salts to imine in the presence of Yb(OTf)3. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.08.133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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18
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End-to-end conformational communication through a synthetic purinergic receptor by ligand-induced helicity switching. Nat Chem 2013; 5:853-60. [PMID: 24056342 DOI: 10.1038/nchem.1747] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 08/06/2013] [Indexed: 11/08/2022]
Abstract
The long-range communication of information, exemplified by signal transduction through membrane-bound receptors, is a central biochemical function. Reversible binding of a messenger ligand induces a local conformational change that is relayed through the receptor, inducing a chemical effect typically several nanometres from the binding site. We report a synthetic receptor mimic that transmits structural information from a boron-based ligand binding site to a spectroscopic reporter located more than 2 nm away. Reversible binding of a diol ligand to the N-terminal binding site induces a screw-sense preference in a helical oligo(aminoisobutyric acid) foldamer, which is relayed to a reporter group at the remote C-terminus, communicating information about the structure and stereochemistry of the ligand. The reversible nature of boronate esterification was exploited to switch the receptor sequentially between left- and right-handed helices, while the exquisite conformational sensitivity of the helical relay allowed the reporter to differentiate even between purine and pyrimidine nucleosides as ligands.
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19
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Claes D, Holzapfel M, Clausen N, Maison W. Synthesis of Adamantane-Based Trimeric Benzoboroxoles. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300769] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Gierczyk B, Kaźmierczak M, Schroeder G, Sporzyński A. 17O NMR studies of boronic acids and their derivatives. NEW J CHEM 2013. [DOI: 10.1039/c3nj40903a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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21
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Lomas JS. 1H NMR spectra of ethane-1,2-diol and other vicinal diols in benzene: GIAO/DFT shift calculations. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2013; 51:32-41. [PMID: 23169263 DOI: 10.1002/mrc.3899] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 10/16/2012] [Accepted: 10/16/2012] [Indexed: 06/01/2023]
Abstract
The proton NMR spectra of several 1,2-diols in benzene have been analysed so as to associate each magnetically nonequivalent proton with its chemical shift. The shifts and coupling constants of the OH and methylene protons of ethane-1,2-diol have been determined in a wide range of solvents. The conformer distribution and the proton NMR shifts of these 1,2-diols in benzene have been computed on the basis of density functional theory. The solvent is included using the integral-equation-formalism polarizable continuum model implemented in Gaussian 09. Relative Gibbs energies for all stable conformers are calculated at the Perdew, Burke and Enzerhof (PBE)0/6-311 + G(d,p) level, and shifts are calculated using the gauge-including atomic orbital method with the PBE0/6-311 + G(d,p) geometry but using the cc-pVTZ basis set. Previous calculations on ethane-1,2-diol and propane-1,2-diol have been corrected and extended. New calculations on tert-butylethane-1,2-diol, phenylethane-1,2-diol, butane-2,3-diols (dl and meso) and cyclohexane-1,2-diols (cis and trans) are presented. Overall, the computed NMR shifts are in good agreement with experimental values for the OH protons but remain systematically high for CH protons. Some results based on the Gaussian 03 solvation model are included for comparison.
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Affiliation(s)
- John S Lomas
- ITODYS, Université Paris Diderot, Sorbonne Paris Cité, UMR 7086, F-75205, Paris, France
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22
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Berg CA, Eichenauer NC, Pietruszka J. (2R,3R)-1,4-Dimethoxy-1,1,4,4-tetraphenylbutane-2,3-diol: Valuable reagent in the asymmetric synthesis of organoboronates. PURE APPL CHEM 2012. [DOI: 10.1351/pac-con-12-03-04] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Tartrate-derived (2R,3R)-1,4-dimethoxy-1,1,4,4-tetraphenylbutane-2,3-diol has found diverse applications in asymmetric organic synthesis. Among these, its utilization as a protecting group for boronic acids has been investigated extensively. Besides being extraordinarily stable and thus allowing a plethora of transformations, it enables access to various diastereo- and enantiomerically pure organoboron reagents and versatile intermediates in asymmetric synthesis.
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Affiliation(s)
- C. Annette Berg
- 1Institut für Bioorganische Chemie der Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich, Stetternicher Forst, Geb.15.8, 52426 Jülich, Germany
| | - Nils C. Eichenauer
- 1Institut für Bioorganische Chemie der Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich, Stetternicher Forst, Geb.15.8, 52426 Jülich, Germany
| | - Jörg Pietruszka
- 1Institut für Bioorganische Chemie der Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich, Stetternicher Forst, Geb.15.8, 52426 Jülich, Germany
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23
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A new derivatization approach for the rapid and sensitive analysis of brassinosteroids by using ultra high performance liquid chromatography-electrospray ionization triple quadrupole mass spectrometry. Talanta 2012; 99:420-5. [DOI: 10.1016/j.talanta.2012.05.073] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2012] [Revised: 05/27/2012] [Accepted: 05/31/2012] [Indexed: 11/23/2022]
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24
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Gallego GM, Sarpong R. Rh(i)-catalyzed enantioselective intramolecular hydroarylation of unactivated ketones with aryl pinacolboronic esters. Chem Sci 2012. [DOI: 10.1039/c2sc01068b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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25
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Georgiou I, Whiting A. Mechanism and optimisation of the homoboroproline bifunctional catalytic asymmetric aldol reaction: Lewis acid tuning through in situ esterification. Org Biomol Chem 2012; 10:2422-30. [DOI: 10.1039/c2ob06872a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Affiliation(s)
- Caleb Bromba
- a Department of Chemistry , University of Victoria , Victoria, Canada
| | - Philippa Carrie
- a Department of Chemistry , University of Victoria , Victoria, Canada
| | | | - Thomas M. Fyles
- a Department of Chemistry , University of Victoria , Victoria, Canada
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Moquist PN, Kodama T, Schaus SE. Enantioselective addition of boronates to chromene acetals catalyzed by a chiral Brønsted acid/Lewis acid system. Angew Chem Int Ed Engl 2010; 49:7096-100. [PMID: 20721997 PMCID: PMC3035997 DOI: 10.1002/anie.201003469] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Chiral α,β-dihydroxy carboxylic acids catalyze the enantioselective addition of alkenyl- and aryl boronates to chromene acetals. The optimal carboxylic acid is a tartaric acid amide, easily synthesized via a 3-step procedure. The reaction is enhanced by the addition of Lanthanide triflate salts such as cerium(IV)-and ytterbium(III) triflate. The chiral Brønsted acid and metal Lewis acid may be used in as low as 5 mol % relative to acetal substrate. Optimization of the reaction conditions can lead to yields >70% and enantiomeric ratios as high as 99:1. Spectroscopic and kinetic mechanistic studies demonstrate an exchange process leading to a reactive dioxoborolane intermediate leading to enantioselective addition to the pyrylium generated from the chromene acetal.
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Affiliation(s)
- Philip N. Moquist
- Department of Chemistry, Center for Chemical Methodology and Library Development at Boston University (CMLD-BU), Life Science and Engineering Building, Boston University, 24 Cummington Street, Boston, Massachusetts, 02215 (USA)
| | - Tomohiro Kodama
- Department of Chemistry, Center for Chemical Methodology and Library Development at Boston University (CMLD-BU), Life Science and Engineering Building, Boston University, 24 Cummington Street, Boston, Massachusetts, 02215 (USA)
| | - Scott E. Schaus
- Department of Chemistry, Center for Chemical Methodology and Library Development at Boston University (CMLD-BU), Life Science and Engineering Building, Boston University, 24 Cummington Street, Boston, Massachusetts, 02215 (USA)
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Enantioselective Addition of Boronates to Chromene Acetals Catalyzed by a Chiral Brønsted Acid/Lewis Acid System. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201003469] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Li P, Li J, Arikan F, Ahlbrecht W, Dieckmann M, Menche D. Stereoselective Total Synthesis of Etnangien and Etnangien Methyl Ester. J Org Chem 2010; 75:2429-44. [DOI: 10.1021/jo100201f] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pengfei Li
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Jun Li
- Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstrasse 7, D-38124 Braunschweig, Germany
| | - Fatih Arikan
- Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstrasse 7, D-38124 Braunschweig, Germany
| | - Wiebke Ahlbrecht
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Michael Dieckmann
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Dirk Menche
- Institut für Organische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
- Helmholtz-Zentrum für Infektionsforschung, Medizinische Chemie, Inhoffenstrasse 7, D-38124 Braunschweig, Germany
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An Improved Synthesis Route to Functionalized 2-Alkyn-1-ylboronates: Useful Intermediates for the Preparation of α-Allenic Alcohols. MONATSHEFTE FUR CHEMIE 2008. [DOI: 10.1007/s00706-007-0769-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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