1
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Zhang HJ, Ociepa M, Nassir M, Zheng B, Lewicki SA, Salmaso V, Baburi H, Nagel J, Mirza S, Bueschbell B, Al-Hroub H, Perzanowska O, Lin Z, Schmidt MA, Eastgate MD, Jacobson KA, Müller CE, Kowalska J, Jemielity J, Baran PS. Stereocontrolled access to thioisosteres of nucleoside di- and triphosphates. Nat Chem 2024; 16:249-258. [PMID: 37857844 DOI: 10.1038/s41557-023-01347-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 09/15/2023] [Indexed: 10/21/2023]
Abstract
Nucleoside diphosphates and triphosphates impact nearly every aspect of biochemistry; however, the use of such compounds as tools or medicinal leads for nucleotide-dependent enzymes and receptors is hampered by their rapid in vivo metabolism. Although a successful strategy to address the instability of the monophosphate moiety in oligonucleotide therapeutics has been accomplished by their isosteric replacement with phosphorothioates, no practical methods exist to rapidly and controllably access stereopure di- and triphosphate thioisosteres of both natural and unnatural nucleosides. Here we show how a modular, reagent-based platform can enable the stereocontrolled and scalable synthesis of a library of such molecules. This operationally simple approach provides access to pure stereoisomers of nucleoside α-thiodiphosphates and α-thiotriphosphates, as well as symmetrical or unsymmetrical dinucleoside thiodiphosphates and thiotriphosphates (including RNA cap reagents). We demonstrate that ligand-receptor interactions can be dramatically influenced by P-stereochemistry, showing that such thioisosteric replacements can have profound effects on the potency and stability of lead candidates.
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Affiliation(s)
- Hai-Jun Zhang
- Department of Chemistry, Scripps Research, La Jolla, CA, USA
| | - Michał Ociepa
- Department of Chemistry, Scripps Research, La Jolla, CA, USA
| | - Molhm Nassir
- Department of Chemistry, Scripps Research, La Jolla, CA, USA
| | - Bin Zheng
- Chemical Process Development, Bristol Myers Squibb, New Brunswick, NJ, USA
| | - Sarah A Lewicki
- Molecular Recognition Section, Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Veronica Salmaso
- Molecular Recognition Section, Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Helay Baburi
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical & Medicinal Chemistry, University of Bonn, Bonn, Germany
| | - Jessica Nagel
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical & Medicinal Chemistry, University of Bonn, Bonn, Germany
| | - Salahuddin Mirza
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical & Medicinal Chemistry, University of Bonn, Bonn, Germany
| | - Beatriz Bueschbell
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical & Medicinal Chemistry, University of Bonn, Bonn, Germany
| | - Haneen Al-Hroub
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical & Medicinal Chemistry, University of Bonn, Bonn, Germany
| | - Olga Perzanowska
- Division of Biophysics, Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland
- Centre of New Technologies, University of Warsaw, Warsaw, Poland
| | - Ziqin Lin
- Chemical Process Development, Bristol Myers Squibb, New Brunswick, NJ, USA
| | - Michael A Schmidt
- Chemical Process Development, Bristol Myers Squibb, New Brunswick, NJ, USA
| | - Martin D Eastgate
- Chemical Process Development, Bristol Myers Squibb, New Brunswick, NJ, USA
| | - Kenneth A Jacobson
- Molecular Recognition Section, Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA.
| | - Christa E Müller
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical & Medicinal Chemistry, University of Bonn, Bonn, Germany.
| | - Joanna Kowalska
- Division of Biophysics, Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland.
| | - Jacek Jemielity
- Centre of New Technologies, University of Warsaw, Warsaw, Poland.
| | - Phil S Baran
- Department of Chemistry, Scripps Research, La Jolla, CA, USA.
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2
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Santiago J, Orłowska K, Ociepa M, Gryko D. Aryl versus Alkyl Redox-Active Diazoacetates ─ Light-Induced C-H Insertion or 1,2-Rearrangement. Org Lett 2023; 25:6267-6271. [PMID: 37607356 PMCID: PMC10476266 DOI: 10.1021/acs.orglett.3c02055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Indexed: 08/24/2023]
Abstract
Diazo compounds with redox-active leaving groups are versatile reagents for orthogonal functionalizations, previously utilized in the Rh-catalyzed synthesis of highly substituted cyclopropanes. Photochemical activation of aryl-substituted diazoacetates generates carbenes, whereas redox-active esters can furnish C-radicals via the photoexcitation of EDA complexes. However, the photochemical behavior of these two functionalities, while present in one molecule, remains to be defined. We demonstrate that under light irradiation, reactions occur only on the diazo moiety, leaving the NHPI functionality intact. Not only aryl- but also alkyl-substituted NHPI diazoacetates are activated by blue light; either C-H insertion or the hydrogen/carbon 1,2-rearrangement occurs depending on the aryl/alkyl group.
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Affiliation(s)
- João
V. Santiago
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44, 5201-224 Warsaw, Poland
| | - Katarzyna Orłowska
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44, 5201-224 Warsaw, Poland
| | - Michał Ociepa
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44, 5201-224 Warsaw, Poland
| | - Dorota Gryko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44, 5201-224 Warsaw, Poland
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3
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Nassir M, Ociepa M, Zhang HJ, Grant LN, Simmons BJ, Oderinde MS, Kawamata Y, Cauley AN, Schmidt MA, Eastgate MD, Baran PS. Stereocontrolled Radical Thiophosphorylation. J Am Chem Soc 2023. [PMID: 37399078 DOI: 10.1021/jacs.3c05655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/05/2023]
Abstract
The first practical, fully stereoselective P(V)-radical hydrophosphorylation is presented herein by using simple, limonene-derived reagent systems. A set of reagents have been developed that upon radical initiation react smoothly with olefins and other radical acceptors to generate P-chiral products, which can be further diversified (with conventional 2e- chemistry) to a range of underexplored bioisosteric building blocks. The reactions have a wide scope with excellent chemoselectivity, and the unexpected stereochemical outcome has been supported computationally and experimentally. Initial ADME studies are suggestive of the promising properties of this rarely explored chemical space.
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Affiliation(s)
- Molhm Nassir
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Michał Ociepa
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Hai-Jun Zhang
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Lauren N Grant
- Small Molecule Drug Discovery, Bristol Myers Squibb, Princeton, New Jersey 08543, United States
| | - Bryan J Simmons
- Small Molecule Drug Discovery, Bristol Myers Squibb, 10300 Campus Point Drive, Suite 100, San Diego, California 92121, United States
| | - Martins S Oderinde
- Small Molecule Drug Discovery, Bristol Myers Squibb, Princeton, New Jersey 08543, United States
| | - Yu Kawamata
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Anthony N Cauley
- Small Molecule Drug Discovery, Bristol Myers Squibb, Princeton, New Jersey 08543, United States
| | - Michael A Schmidt
- Chemical Process Development, Bristol Myers Squibb, One Squibb Drive, New Brunswick, New Jersey 08901, United States
| | - Martin D Eastgate
- Chemical Process Development, Bristol Myers Squibb, One Squibb Drive, New Brunswick, New Jersey 08901, United States
| | - Phil S Baran
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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4
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Abstract
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Oxetanes are valuable
building blocks due to their well-explored
propensity to undergo ring-opening reactions with nucleophiles. However,
their application as precursors of radical species is still elusive.
Herein, we present a bioinspired cobalt-catalysis-based strategy to
access unprecedented modes of radical reactivity via oxetane ring-opening.
This powerful approach gives access to nucleophilic radicals that
engage in reactions with SOMOphiles and low-valent transition metals.
Importantly, the regioselectivity of these processes complements known
methodologies.
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Affiliation(s)
- Aleksandra Potrząsaj
- Institute of Organic Chemistry Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Michał Ociepa
- Institute of Organic Chemistry Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Wojciech Chaładaj
- Institute of Organic Chemistry Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Dorota Gryko
- Institute of Organic Chemistry Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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5
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Ociepa M, Knouse KW, He D, Vantourout JC, Flood DT, Padial NM, Chen JS, Sanchez BB, Sturgell EJ, Zheng B, Qiu S, Schmidt MA, Eastgate MD, Baran PS. Mild and Chemoselective Phosphorylation of Alcohols Using a Ψ-Reagent. Org Lett 2021; 23:9337-9342. [PMID: 34499517 PMCID: PMC8733960 DOI: 10.1021/acs.orglett.1c02736] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An operationally simple, scalable, and chemoselective method for the direct phosphorylation of alcohols using a P(V)-approach based on the Ψ-reagent platform is disclosed. The method features a broad substrate scope of utility in both simple and complex settings and provides access to valuable phosphorylated alcohols that would be otherwise difficult to obtain.
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Affiliation(s)
- Michał Ociepa
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, United States
| | - Kyle W. Knouse
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, United States
| | - David He
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, United States
| | - Julien C. Vantourout
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, United States
| | - Dillon T. Flood
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, United States
| | - Natalia M. Padial
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, United States
| | - Jason S. Chen
- Automated Synthesis Facility, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, United States
| | - Brittany B. Sanchez
- Automated Synthesis Facility, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, United States
| | - Emily J. Sturgell
- Automated Synthesis Facility, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, United States
| | - Bin Zheng
- Chemical Process Development, Bristol Myers Squibb, One Squibb Drive, New Brunswick, New Jersey, 08901, United States
| | - Shenjie Qiu
- Chemical Process Development, Bristol Myers Squibb, One Squibb Drive, New Brunswick, New Jersey, 08901, United States
| | - Michael A. Schmidt
- Chemical Process Development, Bristol Myers Squibb, One Squibb Drive, New Brunswick, New Jersey, 08901, United States
| | - Martin D. Eastgate
- Chemical Process Development, Bristol Myers Squibb, One Squibb Drive, New Brunswick, New Jersey, 08901, United States
| | - Phil S. Baran
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, United States
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6
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Turkowska J, Durka J, Ociepa M, Gryko D. Reversal of regioselectivity in reactions of donor-acceptor cyclopropanes with electrophilic olefins. Chem Commun (Camb) 2021; 58:509-512. [PMID: 34897317 DOI: 10.1039/d1cc05330b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Reactivity of donor-acceptor cyclopropanes towards nucleophiles and electrophiles is determined by the specific philicity of the carbon atoms originating from the strong polarization of the central C-C bond. Herein, we report that vitamin B12 catalysis enables the transformation of an initially electrophilic center into a nucleophilic radical that reacts with SOMOphiles. This radical-based strategy reverses the standard regioselectivity and thus complements the classical approaches.
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Affiliation(s)
- Joanna Turkowska
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Jakub Durka
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Michał Ociepa
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Dorota Gryko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
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7
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Ociepa M, Wierzba AJ, Turkowska J, Gryko D. Polarity-Reversal Strategy for the Functionalization of Electrophilic Strained Molecules via Light-Driven Cobalt Catalysis. J Am Chem Soc 2020; 142:5355-5361. [PMID: 32105464 DOI: 10.1021/jacs.0c00245] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Strain-release-driven methodology is a powerful tool for accessing structural motifs, highly desirable by the pharmaceutical industry. The reactivity of spring-loaded cyclic reagents is dominated by transformations relying on their inherent electrophilic reactivity. Herein, we present a polarity-reversal strategy based on light-driven cobalt catalysis, which enables the generation of nucleophilic radicals through strain release. The applicability of this methodology is demonstrated by the design of two distinct types of reactions: Giese-type addition and Co/Ni-catalyzed cross-coupling. Moreover, a series of electrochemical, spectroscopic, and kinetic experiments as well as X-ray structural analysis of the intermediate alkylcobalt(III) complex give deeper insight into the mechanism of the reaction.
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Affiliation(s)
- Michał Ociepa
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Aleksandra J Wierzba
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Joanna Turkowska
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Dorota Gryko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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8
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Potrząsaj A, Ociepa M, Baka O, Spólnik G, Gryko D. Vitamin B12
Enables Consecutive Generation of Acyl and Alkyl Radicals from One Reagent. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901137] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Aleksandra Potrząsaj
- Institute of Organic Chemistry Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Michał Ociepa
- Institute of Organic Chemistry Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Oskar Baka
- Institute of Organic Chemistry Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Grzegorz Spólnik
- Institute of Organic Chemistry Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Dorota Gryko
- Institute of Organic Chemistry Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
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9
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Ociepa M, Turkowska J, Gryko D. Redox-Activated Amines in C(sp3)–C(sp) and C(sp3)–C(sp2) Bond Formation Enabled by Metal-Free Photoredox Catalysis. ACS Catal 2018. [DOI: 10.1021/acscatal.8b03437] [Citation(s) in RCA: 103] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michał Ociepa
- Institute of Organic Chemistry Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Joanna Turkowska
- Institute of Organic Chemistry Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Dorota Gryko
- Institute of Organic Chemistry Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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10
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Affiliation(s)
- Maksymilian Karczewski
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Michał Ociepa
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Dorota Gryko
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
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11
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Ociepa M, Baka O, Narodowiec J, Gryko D. Cover Picture: Light-Driven Vitamin B 12
-Catalysed Generation of Acyl Radicals from 2- S
-Pyridyl Thioesters (Adv. Synth. Catal. 20/2017). Adv Synth Catal 2017. [DOI: 10.1002/adsc.201701271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Michał Ociepa
- Institute of Organic Chemistry Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Oskar Baka
- Institute of Organic Chemistry Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
- Warsaw University of Technology; Faculty of Chemistry; Noakowskiego 3 00-664 Warsaw Poland
| | - Jakub Narodowiec
- Institute of Organic Chemistry Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Dorota Gryko
- Institute of Organic Chemistry Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
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12
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Affiliation(s)
- Michał Ociepa
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Oskar Baka
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
- Warsaw University of Technology Faculty of Chemistry Noakowskiego 3 00-664 Warsaw Poland
| | - Jakub Narodowiec
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Dorota Gryko
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
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13
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Karczewski M, Ociepa M, Pluta K, ó Proinsias K, Gryko D. Inside Back Cover: Vitamin B 12
Catalysis: Probing the Structure/Efficacy Relationship (Chem. Eur. J. 29/2017). Chemistry 2017. [DOI: 10.1002/chem.201700800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Maksymilian Karczewski
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Michał Ociepa
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Katarzyna Pluta
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Keith ó Proinsias
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Dorota Gryko
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
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14
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Karczewski M, Ociepa M, Pluta K, ó Proinsias K, Gryko D. Vitamin B12
Catalysis: Probing the Structure/Efficacy Relationship. Chemistry 2017; 23:7024-7030. [DOI: 10.1002/chem.201606059] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Maksymilian Karczewski
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Michał Ociepa
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Katarzyna Pluta
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Keith ó Proinsias
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Dorota Gryko
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
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15
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Ó Proinsias K, Ociepa M, Pluta K, Chromiński M, Nexo E, Gryko D. Vitamin B12Phosphate Conjugation and Its Effect on Binding to the Human B12-Binding Proteins Intrinsic Factor and Haptocorrin. Chemistry 2016; 22:8282-9. [DOI: 10.1002/chem.201504898] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Indexed: 12/18/2022]
Affiliation(s)
- Keith Ó Proinsias
- Institute of Organic Chemistry PAS; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Michał Ociepa
- Institute of Organic Chemistry PAS; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Katarzyna Pluta
- Institute of Organic Chemistry PAS; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Mikołaj Chromiński
- Institute of Organic Chemistry PAS; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Ebba Nexo
- Department of Clinical Biochemistry; Aarhus University Hospital; Norrebrogade 44 8000 Aarhus Denmark
| | - Dorota Gryko
- Institute of Organic Chemistry PAS; Kasprzaka 44/52 01-224 Warsaw Poland
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16
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Bernatowicz P, Kubica D, Ociepa M, Wodyński A, Gryff-Keller A. Scalar relaxation of the second kind. A potential source of information on the dynamics of molecular movements. 4. Molecules with collinear C-H and C-Br bonds. J Phys Chem A 2014; 118:4063-70. [PMID: 24835107 DOI: 10.1021/jp5037298] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Continuing studies based on measurements of the nuclear spin relaxation rates running via the SC2 mechanism (scalar relaxation of the second kind), we present in this work the results obtained for three molecules: 9-bromotriptycene, 1,3,5-tribromobenzene, and 1-(2-bromoethynyl)-4-ethynylbenzene in which C-Br bond and one of C-H bonds are collinear. Separation of saturation-recovery or inversion-recovery curves of (13)C NMR signals of bromine-bonded carbons in the investigated compounds on two components has provided the longitudinal SC2 relaxation rates of these carbons in (79)Br- and (81)Br-containing isotopomers. These data have enabled experimental determination of the bromine-carbon spin-spin coupling constants and relaxation rates of quadrupole bromine nuclei, hardly accessible by direct measurements. At the same time the rotational diffusion parameters describing the reorientation of the C-Br vectors have been determined for the investigated molecules on the basis of the dipolar relaxation of protonated carbons. These diffusion parameters are crucial for interpretation of the bromine relaxation rates. The values of the indirect (1)J((13)C,(79)Br) coupling constants, magnetic shielding of carbon nuclei and quadrupole coupling constants of bromines, determined for the investigated compounds, have been compared with the results of the theoretical calculations which take into account relativistic effects. The origin of some divergences between the results obtained by different methods has been discussed.
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Affiliation(s)
- Piotr Bernatowicz
- Institute of Physical Chemistry, Polish Academy of Science , Kasprzaka 44/52, 01-224 Warszawa, Poland
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17
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Badia-Vila M, Ociepa M, Mateo R, Guitart R. Comparison of residue levels of persistent organochlorine compounds in butter from Spain and from other European countries. J Environ Sci Health B 2000; 35:201-210. [PMID: 10736769 DOI: 10.1080/03601230009373264] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Commercially available butter from Spain (n = 36) and from other European countries (n = 20) has been analyzed by high resolution gas chromatography with an electron capture detector for organochlorine contaminants. The results showed that both groups of samples have a similar pattern of these pollutants, but in all cases where significant differences in concentrations were found, Spanish samples presented higher values. This was especially notable for lindane (median values 11.6 vs. 3.0 ng/g wet weight), hexachlorobenzene (6.4 vs. 0.5) and beta-hexachlorocyclohexane (3.1 vs. 1.2). Total PCBs showed no differences (5.4 vs. 6.6), but detailed analysis of congener composition indicated a higher presence in Spanish samples of the most persistent chlorinated PCBs. No sample presented levels of concern for any single organochlorine compound. It is interesting to note that consumption of butter in Spain is low so, although levels of organochlorines are higher than those found in other countries, consumers are less exposed through this foodstuff than in other European countries. These results also confirm the fact that environmental pollution by organochlorines is more important in Spain than in the rest of Europe.
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Affiliation(s)
- M Badia-Vila
- Laboratory of Toxicology, School of Veterinary Sciences, Universitat Autònoma de Barcelona, Bellaterra, Spain
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