1
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Alkahtani R, Wirth T. Synthesis of Chiral Iodoaniline-Lactate Based Catalysts for the α-Functionalization of Ketones. ACS ORGANIC & INORGANIC AU 2023; 3:209-216. [PMID: 37545658 PMCID: PMC10401694 DOI: 10.1021/acsorginorgau.3c00012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 04/24/2023] [Accepted: 04/25/2023] [Indexed: 08/08/2023]
Abstract
A family of chiral iodoaniline-lactate based catalysts with C1 and C2 symmetry were efficiently synthesized. Comparisons between the reactivity and selectivity between the new and previously reported catalysts are made. The new catalysts promoted the α-oxysulfonylation of ketones in shorter reaction times and with higher yields of up to 99%. A scope for the oxysulfonylation reaction is presented, forming a variety of reported and novel products with enantioselectivities of up to 83%.
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Affiliation(s)
- Rawiyah Alkahtani
- School
of Chemistry, Cardiff University, Main Building, Park Place, CF10 3AT, Cardiff, United Kingdom
- Chemistry
Department, College of Science, Princess
Nourah bint Abdulrahman University, 11671, Riyadh, Saudi
Arabia
| | - Thomas Wirth
- School
of Chemistry, Cardiff University, Main Building, Park Place, CF10 3AT, Cardiff, United Kingdom
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2
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Ruyonga MR, Mendoza O, Browne M, Samoshin VV. Exploration of
trans
‐2‐(azaarylsulfanyl)‐cyclohexanols as potential pH‐triggered conformational switches. J PHYS ORG CHEM 2020. [DOI: 10.1002/poc.4068] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Mulinde R. Ruyonga
- Department of Chemistry, College of the Pacific University of the Pacific Stockton CA USA
| | - Oscar Mendoza
- Department of Chemistry, College of the Pacific University of the Pacific Stockton CA USA
| | - Michael Browne
- Department of Chemistry, College of the Pacific University of the Pacific Stockton CA USA
| | - Vyacheslav V. Samoshin
- Department of Chemistry, College of the Pacific University of the Pacific Stockton CA USA
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3
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Luccarelli J, Paton RS. Hydrogen-Bond-Dependent Conformational Switching: A Computational Challenge from Experimental Thermochemistry. J Org Chem 2019; 84:613-621. [PMID: 30586500 DOI: 10.1021/acs.joc.8b02436] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have compiled an experimental data set (SWITCH10) of equilibrium constants for a series of hydrogen-bond-dependent conformational switches. These organic molecules possess common functionalities and are representative in terms of size and composition of systems routinely studied computationally. They exist as two well-defined conformations which serve as a useful tool to benchmark computational estimates of experimental Gibbs energy differences. We examine the performance of HF theory and a variety of density functionals (B3LYP, B3LYP-D3, CAM-B3LYP, ωB97X-D, M06-2X) against these experimental benchmarks. Surprisingly, despite a strong similarity between the two switch conformations, the average errors (0.4-1.7 kcal·mol-1) obtained across the data set for all methods are larger than obtained with HF calculations. B3LYP was found to outperform implicitly and explicitly dispersion-corrected functionals, with an average error smaller by 1 kcal·mol-1. Unsystematic errors in the optimized structures were found to contribute to the relatively poor performance obtained, while quasi-rigid rotor harmonic oscillator thermal contributions are important in improving the accuracy of computed Gibbs energy differences. These results emphasize the challenge of quantitative accuracy in computing solution-phase thermochemistry for flexible systems and caution against the often used (but unstated) assumption of favorable error cancellation in comparing conformers or stereoisomers.
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Affiliation(s)
- James Luccarelli
- Chemistry Research Laboratory , University of Oxford , 12 Mansfield Road , Oxford OX1 3TA , U.K.,Department of Psychiatry , Massachusetts General Hospital , 55 Fruit Street , Boston , Massachusetts 02114 , United States
| | - Robert S Paton
- Chemistry Research Laboratory , University of Oxford , 12 Mansfield Road , Oxford OX1 3TA , U.K.,Department of Chemistry , Colorado State University , Fort Collins , Colorado 80523 , United States
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4
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Samoshin VV, Zheng Y, Liu X. Trans
-2-Aminocyclohexanol derivatives as pH-triggered conformational switches. J PHYS ORG CHEM 2017. [DOI: 10.1002/poc.3689] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Vyacheslav V. Samoshin
- Department of Chemistry, College of the Pacific; University of the Pacific; Stockton CA 95211 USA
| | - Yu Zheng
- Department of Chemistry, College of the Pacific; University of the Pacific; Stockton CA 95211 USA
| | - Xin Liu
- Department of Chemistry, College of the Pacific; University of the Pacific; Stockton CA 95211 USA
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5
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Luccarelli J, Jones IM, Thompson S, Hamilton AD. Unpicking the determinants of amide NH⋯OC hydrogen bond strength with diphenylacetylene molecular balances. Org Biomol Chem 2017; 15:9156-9163. [DOI: 10.1039/c7ob02026k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The stereoelectronic properties affecting hydrogen bond strength are investigated with a series of diphenylacetylene-based molecular balances.
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Affiliation(s)
| | - Ian M. Jones
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
- Department of Chemistry
| | - Sam Thompson
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
- Chemistry
| | - Andrew D. Hamilton
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
- Department of Chemistry
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6
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Knipe PC, Thompson S, Hamilton AD. Acid-mediated topological control in a functionalized foldamer. Chem Commun (Camb) 2016; 52:6521-4. [DOI: 10.1039/c6cc01496h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Protonation mediates the transition between linear and helical foldamer topologies giving rise to a dynamic, functionalized molecular surface.
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Affiliation(s)
- Peter C. Knipe
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
| | - Sam Thompson
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
| | - Andrew D. Hamilton
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
- Department of Chemistry
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7
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Brioche J, Pike S, Tshepelevitsh S, Leito I, Morris GA, Webb SJ, Clayden J. Conformational Switching of a Foldamer in a Multicomponent System by pH-Filtered Selection between Competing Noncovalent Interactions. J Am Chem Soc 2015; 137:6680-91. [PMID: 25915163 PMCID: PMC4520694 DOI: 10.1021/jacs.5b03284] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Indexed: 12/26/2022]
Abstract
Biomolecular systems are able to respond to their chemical environment through reversible, selective, noncovalent intermolecular interactions. Typically, these interactions induce conformational changes that initiate a signaling cascade, allowing the regulation of biochemical pathways. In this work, we describe an artificial molecular system that mimics this ability to translate selective noncovalent interactions into reversible conformational changes. An achiral but helical foldamer carrying a basic binding site interacts selectively with the most acidic member of a suite of chiral ligands. As a consequence of this noncovalent interaction, a global absolute screw sense preference, detectable by (13)C NMR, is induced in the foldamer. Addition of base, or acid, to the mixture of ligands competitively modulates their interaction with the binding site, and reversibly switches the foldamer chain between its left and right-handed conformations. As a result, the foldamer-ligand mixture behaves as a biomimetic chemical system with emergent properties, functioning as a "proton-counting" molecular device capable of providing a tunable, pH-dependent conformational response to its environment.
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Affiliation(s)
- Julien Brioche
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
| | - Sarah
J. Pike
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
| | - Sofja Tshepelevitsh
- Institute
of Chemistry, University of Tartu, Ravila 14a, Tartu 50411, Estonia
| | - Ivo Leito
- Institute
of Chemistry, University of Tartu, Ravila 14a, Tartu 50411, Estonia
| | - Gareth A. Morris
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
| | - Simon J. Webb
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
- Manchester
Institute of Biotechnology, University of
Manchester, 131 Princess
Street, Manchester M1 7DN, United Kingdom
| | - Jonathan Clayden
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
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8
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Knipe PC, Thompson S, Hamilton AD. Ion-mediated conformational switches. Chem Sci 2015; 6:1630-1639. [PMID: 28694943 PMCID: PMC5482205 DOI: 10.1039/c4sc03525a] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 11/19/2014] [Indexed: 01/02/2023] Open
Abstract
Molecular switches are ubiquitous in Nature and provide the basis of many forms of transport and signalling. Single synthetic molecules that change conformation, and thus function, reversibly in a stimulus-dependent manner are of great interest not only to chemists but society in general; myriad applications exist in storage, display, sensing and medicine. Here we describe recent developments in the area of ion-mediated switching.
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Affiliation(s)
- Peter C Knipe
- Department of Chemistry , Chemistry Research Laboratory , University of Oxford , 12 Mansfield Road , Oxford OX1 3TA , UK . ; ; Tel: +44 (0)1865 275978
| | - Sam Thompson
- Department of Chemistry , Chemistry Research Laboratory , University of Oxford , 12 Mansfield Road , Oxford OX1 3TA , UK . ; ; Tel: +44 (0)1865 275978
| | - Andrew D Hamilton
- Department of Chemistry , Chemistry Research Laboratory , University of Oxford , 12 Mansfield Road , Oxford OX1 3TA , UK . ; ; Tel: +44 (0)1865 275978
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9
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Schmittel M, De S, Pramanik S. Redox-dependent self-sorting toggles a rotary nanoswitch. Org Biomol Chem 2015. [DOI: 10.1039/c5ob01041a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The pyridine–pyrimidine (py–pym) arm as the moving part of the two-state nanomechanical rotary switch [Cu(1)]+ is toggled reversibly between two stations using one-electron oxidation/reduction.
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Affiliation(s)
- Michael Schmittel
- Center of Micro and Nanochemistry and Engineering
- Organische Chemie I
- Universität Siegen
- D-57068 Siegen
- Germany
| | - Soumen De
- Center of Micro and Nanochemistry and Engineering
- Organische Chemie I
- Universität Siegen
- D-57068 Siegen
- Germany
| | - Susnata Pramanik
- Center of Micro and Nanochemistry and Engineering
- Organische Chemie I
- Universität Siegen
- D-57068 Siegen
- Germany
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10
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Knipe PC, Jones IM, Thompson S, Hamilton AD. Remote conformational control of a molecular switch via methylation and deprotonation. Org Biomol Chem 2014; 12:9384-8. [DOI: 10.1039/c4ob01991a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Methylation and deprotonation at remote sites of a diphenylacetylene-based molecular switch exert global conformational changes through subtle tuning of a hydrogen-bonding network.
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Affiliation(s)
- Peter C. Knipe
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford OX1 3TA, UK
| | - Ian M. Jones
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford OX1 3TA, UK
| | - Sam Thompson
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford OX1 3TA, UK
| | - Andrew D. Hamilton
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford OX1 3TA, UK
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