1
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Berlin CB, Sharma E, Kozlowski MC. Quantification of Hydrogen-Bond-Donating Ability of Biologically Relevant Compounds. J Org Chem 2024; 89:4684-4690. [PMID: 38483838 PMCID: PMC11305090 DOI: 10.1021/acs.joc.3c02939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
Hydrogen bonding is a key factor in the design of ligands for biological binding, including drug targets. Our group previously developed a method for experimentally assessing the hydrogen-bond-donating ability of an analyte using UV-vis titrations with a colorimetric sensor. Using this method, 79 new titrations were performed on weak hydrogen-bond donors, with a focus on heterocycles and pharmaceutically relevant motifs. The hydrogen-bond donating abilities of drug compounds and the substructures of drug compounds were also measured. These titrations will be used to build a database of hydrogen-bond donors.
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Affiliation(s)
- Cameron B. Berlin
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6223, United States
| | - Eesha Sharma
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6223, United States
| | - Marisa C. Kozlowski
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6223, United States
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2
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Dalton J, Bernal Sánchez A, Kelly AT, Fettinger JC, Franz AK. Organocatalytic Asymmetric Synthesis of Si-Stereogenic Siloxanols. ACS Catal 2024; 14:1005-1012. [PMID: 38269039 PMCID: PMC10804373 DOI: 10.1021/acscatal.3c03932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 01/26/2024]
Abstract
We report the organocatalytic synthesis of Si-stereogenic compounds via desymmetrization of a prochiral silanediol with a chiral imidazole-containing catalyst. This metal-free silylation method affords high yields with enantioselectivity up to 98:2 for various silanediol and silyl chloride substrate combinations (including secondary alkyl, vinyl, and H groups), accessing products with potential for further elaboration. NMR and X-ray studies reveal insight into the H-bonding interactions between the imidazole organocatalyst and the silanediol and the dual activating role of the Lewis basic imidazole to account for the high enantioselectivity.
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Affiliation(s)
- Jacob
J. Dalton
- Department of Chemistry, University of California Davis, One Shields Ave, Davis, California 95616, United States
| | - Adilene Bernal Sánchez
- Department of Chemistry, University of California Davis, One Shields Ave, Davis, California 95616, United States
| | - Austin T. Kelly
- Department of Chemistry, University of California Davis, One Shields Ave, Davis, California 95616, United States
| | - James C. Fettinger
- Department of Chemistry, University of California Davis, One Shields Ave, Davis, California 95616, United States
| | - Annaliese K. Franz
- Department of Chemistry, University of California Davis, One Shields Ave, Davis, California 95616, United States
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3
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Pál D, Besnard C, de Aguirre A, Poblador-Bahamonde AI, Pescitelli G, Lacour J. 2,4,5,7-Tetranitrofluorenone Oximate for the Naked-Eye Detection of H-Bond Donors and the Chiroptical Sensing of Enantiopure Reagents. Chemistry 2023; 29:e202302169. [PMID: 37529861 DOI: 10.1002/chem.202302169] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/01/2023] [Accepted: 08/02/2023] [Indexed: 08/03/2023]
Abstract
Hydrogen bonding greatly influences rates and equilibrium positions of chemical reactions, conformations, and sometimes even stereochemistry. This study reports on tetranitrofluorenone oximate, a novel dye capable of naked-eye detection of hydrogen-bond donating species (HBDs) and of rapid determination of H-bond donation strength by hypsochromic shift monitoring. In addition, the molecule possesses atropisomeric conformations, of M and P configuration, as evidenced in solid and solution state studies by X-ray diffraction and electronic circular dichroism (ECD), respectively. In the latter case, enantiopure bis-thioureas were the most effective HBDs to promote a chiral induction (diastereoselective recognition, Pfeiffer effect); the ECD results being rationalized by time-dependent density functional theory (TDDFT) calculations. Based on these experiments, bis-thioureas were used as chiral reagents in asymmetric 1,3-dipolar cycloadditions of structurally-related nitrones; the ECD sensing of the stereoinduction between bis-thioureas and the oximate serving as an indirect method of selection of the most effective HBD for asymmetric synthesis.
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Affiliation(s)
- Dávid Pál
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211, Geneva 4, Switzerland
| | - Céline Besnard
- Laboratory of Crystallography, University of Geneva, Quai Ernest Ansermet Genève, 24, 1211, Geneva 4, Switzerland
| | - Adiran de Aguirre
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211, Geneva 4, Switzerland
| | | | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, University of Pisa, Via G. Moruzzi 13, 56124, Pisa, Italy
| | - Jérôme Lacour
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211, Geneva 4, Switzerland
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4
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Roenfanz HF, Paniak TJ, Berlin CB, Tran V, Francisco KR, Lassalas P, Devas A, Landes O, Rosenberger A, Rotella ME, Ballatore C, Kozlowski MC. Hydrogen Bonding Parameters by Rapid Colorimetric Assessment: Evaluation of Structural Components Found in Biological Ligands and Organocatalysts. Chemistry 2023; 29:e202300696. [PMID: 36917701 PMCID: PMC10363249 DOI: 10.1002/chem.202300696] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 03/13/2023] [Accepted: 03/14/2023] [Indexed: 03/16/2023]
Abstract
Hydrogen bonding is a key molecular interaction in biological processes, drug delivery, and catalysis. This report describes a high throughput UV-Vis spectroscopic method to measure hydrogen bonding capacity using a pyrazinone sensor. This colormetric sensor reversibly binds to a hydrogen bond donor, resulting in a blue shift as additional equivalents of donor are added. Titration with excess equivalents of donor is used to determine the binding coefficient, ln(Keq ). Over 100 titrations were performed for a variety of biologically relevant compounds. This data enabled development a multiple linear regression model that is capable of predicting 95 % of ln(Keq ) values within 1 unit, allowing for the estimation of hydrogen bonding affinity from a single measurement. To show the effectiveness of the single point measurements, hydrogen bond strengths were obtained for a set of carboxylic acid bioisosteres. The values from the single point measurements were validated with full titrations.
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Affiliation(s)
- Hanna F Roenfanz
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Thomas J Paniak
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Cameron B Berlin
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Van Tran
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Karol R Francisco
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Pierrik Lassalas
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Anisha Devas
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Olivia Landes
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Avalon Rosenberger
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Madeline E Rotella
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Carlo Ballatore
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Marisa C Kozlowski
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
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5
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McDermott PE, Fearraigh MPÓ, Horan AM, McGarrigle EM. Thiourea-catalysed conjugate additions of amines to vinyl phosphonates and phosphinates. Org Biomol Chem 2023; 21:1027-1032. [PMID: 36607271 DOI: 10.1039/d2ob02116a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Thiourea catalysts activated α,β-unsaturated phosphonates and phosphinates toward conjugate addition by amines to give β-aminophosphonates and β-aminophosphinates. The organocatalytic methodology was used to synthesise 15 β-aminophosphonates and -phosphinates in yields up to 99%. A gram-scale example furnished the corresponding β-aminophosphonate in an isolated yield of 99% with 97% catalyst recovery. Based on mechanistic experiments, hydrogen bonding between the phosphoryl oxygen and thiourea are proposed to play a crucial role in substrate activation.
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Affiliation(s)
- Peter E McDermott
- A2P CDT in sustainable chemistry and BiOrbic Bioeconomy SFI Research Centre, University College Dublin, Belfield, Dublin 4, Ireland. .,Centre for Synthesis & Chemical Biology, UCD School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Martin P Ó Fearraigh
- Centre for Synthesis & Chemical Biology, UCD School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Alexandra M Horan
- Centre for Synthesis & Chemical Biology, UCD School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.,SSPC, the SFI Research Centre for Pharmaceuticals, Centre for Synthesis & Chemical Biology, UCD School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Eoghan M McGarrigle
- A2P CDT in sustainable chemistry and BiOrbic Bioeconomy SFI Research Centre, University College Dublin, Belfield, Dublin 4, Ireland. .,Centre for Synthesis & Chemical Biology, UCD School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.,SSPC, the SFI Research Centre for Pharmaceuticals, Centre for Synthesis & Chemical Biology, UCD School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
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6
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Wang X, Wang YN, Pei Z, Li SJ, Wei D, Lan Y. N-Heterocyclic Carbene/Brønsted Acid Cooperatively Catalyzed Conversions of α, β-Unsaturated Carbonyls: Hydrogen Bond Donor/Acceptor-Electrophile/Nucleophile Combination Models. ACS Catal 2022. [DOI: 10.1021/acscatal.2c05373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Xinghua Wang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Ya-Nan Wang
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 400030, China
| | - Zhipeng Pei
- Institue for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Adelaide, South Australia 5042, Australia
- Department of Chemistry, Faculty of Science, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Shi-Jun Li
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Donghui Wei
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Yu Lan
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 400030, China
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7
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Gallarati S, van Gerwen P, Laplaza R, Vela S, Fabrizio A, Corminboeuf C. OSCAR: an extensive repository of chemically and functionally diverse organocatalysts. Chem Sci 2022; 13:13782-13794. [PMID: 36544722 PMCID: PMC9710326 DOI: 10.1039/d2sc04251g] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 10/24/2022] [Indexed: 12/24/2022] Open
Abstract
The automated construction of datasets has become increasingly relevant in computational chemistry. While transition-metal catalysis has greatly benefitted from bottom-up or top-down strategies for the curation of organometallic complexes libraries, the field of organocatalysis is mostly dominated by case-by-case studies, with a lack of transferable data-driven tools that facilitate both the exploration of a wider range of catalyst space and the optimization of reaction properties. For these reasons, we introduce OSCAR, a repository of 4000 experimentally derived organocatalysts along with their corresponding building blocks and combinatorially enriched structures. We outline the fragment-based approach used for database generation and showcase the chemical diversity, in terms of functions and molecular properties, covered in OSCAR. The structures and corresponding stereoelectronic properties are publicly available (https://archive.materialscloud.org/record/2022.106) and constitute the starting point to build generative and predictive models for organocatalyst performance.
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Affiliation(s)
- Simone Gallarati
- Laboratory for Computational Molecular Design, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL)1015 LausanneSwitzerland
| | - Puck van Gerwen
- Laboratory for Computational Molecular Design, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL)1015 LausanneSwitzerland,National Center for Competence in Research – Catalysis (NCCR-Catalysis), Ecole Polytechnique Fédérale de Lausanne (EPFL)1015 LausanneSwitzerland
| | - Ruben Laplaza
- Laboratory for Computational Molecular Design, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL)1015 LausanneSwitzerland,National Center for Competence in Research – Catalysis (NCCR-Catalysis), Ecole Polytechnique Fédérale de Lausanne (EPFL)1015 LausanneSwitzerland
| | - Sergi Vela
- Laboratory for Computational Molecular Design, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL)1015 LausanneSwitzerland
| | - Alberto Fabrizio
- Laboratory for Computational Molecular Design, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL)1015 LausanneSwitzerland,National Center for Computational Design and Discovery of Novel Materials (MARVEL), Ecole Polytechnique Fédérale de Lausanne (EPFL)1015 LausanneSwitzerland
| | - Clemence Corminboeuf
- Laboratory for Computational Molecular Design, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL)1015 LausanneSwitzerland,National Center for Competence in Research – Catalysis (NCCR-Catalysis), Ecole Polytechnique Fédérale de Lausanne (EPFL)1015 LausanneSwitzerland,National Center for Computational Design and Discovery of Novel Materials (MARVEL), Ecole Polytechnique Fédérale de Lausanne (EPFL)1015 LausanneSwitzerland
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8
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Wales SM, Morris DTJ, Clayden J. Reversible Capture and Release of a Ligand Mediated by a Long-Range Relayed Polarity Switch in a Urea Oligomer. J Am Chem Soc 2022; 144:2841-2846. [PMID: 35142216 PMCID: PMC9097480 DOI: 10.1021/jacs.1c11928] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
![]()
Ethylene-bridged
oligoureas characterized by a continuous, switchable
chain of hydrogen bonds and carrying a binding site (an N,N′-disubstituted
urea) for a hydrogen-bond-accepting ligand (a phosphine oxide) were
synthesized. These oligomers show stronger ligand binding when the
binding site is located at the hydrogen-bond-donating terminus than
when the same binding site is at the hydrogen-bond-accepting terminus.
An acidic group at the terminus remote from the binding site allows
hydrogen bond polarity, and hence ligand binding ability, to be controlled
remotely by a deprotonation/reprotonation cycle. Addition of base
induces a remote conformational change that is relayed through up
to five urea linkages, reducing the ability of the binding site to
retain an intermolecular association to its ligand, which is consequently
released into solution. Reprotonation returns the polarity of the
oligomer to its original directionality, restoring the function of
the remote binding site, which consequently recaptures the ligand.
This is the first example of a synthetic molecular structure that
relays intermolecular binding information, and these “dynamic
foldamer” structures are prototypes of components for chemical
systems capable of controlling chemical function from a distance.
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Affiliation(s)
- Steven M Wales
- School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K
| | - David T J Morris
- School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K
| | - Jonathan Clayden
- School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K
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9
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Franchino A, Martí À, Nejrotti S, Echavarren AM. Silver-Free Au(I) Catalysis Enabled by Bifunctional Urea- and Squaramide-Phosphine Ligands via H-Bonding. Chemistry 2021; 27:11989-11996. [PMID: 34018646 PMCID: PMC8457243 DOI: 10.1002/chem.202101751] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Indexed: 12/14/2022]
Abstract
A library of gold(I) chloride complexes with phosphine ligands incorporating pendant (thio)urea and squaramide H-bond donors was prepared with the aim of promoting chloride abstraction from Au(I) via H-bonding. In the absence of silver additives, complexes bearing squaramides and trifluoromethylated aromatic ureas displayed good catalytic activity in the cyclization of N-propargyl benzamides, as well as in a 1,6-enyne cycloisomerization, a tandem cyclization-indole addition reaction and the hydrohydrazination of phenylacetylene. Kinetic studies and DFT calculations indicate that the energetic span of the reaction is accounted by both the chloride abstraction step, facilitated by the bidentate H-bond donor via an associative mechanism, and the subsequent cyclization step.
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Affiliation(s)
- Allegra Franchino
- Institute of Chemical Research of Catalonia (ICIQ)Barcelona Institute of Science and TechnologyAv. Països Catalans 1643007TarragonaSpain
- Departament de Química Analítica i Química OrgànicaUniversitat Rovira i VirgiliC/ Marcel⋅lí Domingo s/n43007TarragonaSpain
| | - Àlex Martí
- Institute of Chemical Research of Catalonia (ICIQ)Barcelona Institute of Science and TechnologyAv. Països Catalans 1643007TarragonaSpain
- Departament de Química Analítica i Química OrgànicaUniversitat Rovira i VirgiliC/ Marcel⋅lí Domingo s/n43007TarragonaSpain
| | - Stefano Nejrotti
- Institute of Chemical Research of Catalonia (ICIQ)Barcelona Institute of Science and TechnologyAv. Països Catalans 1643007TarragonaSpain
- Departament de Química Analítica i Química OrgànicaUniversitat Rovira i VirgiliC/ Marcel⋅lí Domingo s/n43007TarragonaSpain
| | - Antonio M. Echavarren
- Institute of Chemical Research of Catalonia (ICIQ)Barcelona Institute of Science and TechnologyAv. Països Catalans 1643007TarragonaSpain
- Departament de Química Analítica i Química OrgànicaUniversitat Rovira i VirgiliC/ Marcel⋅lí Domingo s/n43007TarragonaSpain
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10
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Shirshin KK, Esipovich AL, Kazantsev OA, Rumyantsev M, Korotaev MS, Rogozhin AE. Specific Organocatalysis in Amidation Reaction of Fatty Acid Methyl Esters with 3‐(Dimethylamino)‐1‐propylamine. ChemistrySelect 2021. [DOI: 10.1002/slct.202003197] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Konstantin K. Shirshin
- Nizhny Novgorod State Technical University n.a. R.E. Alexeev Russian Federation Nizhni Novgorod 24 Ulitsa Minina (Minin street)
| | - Anton L. Esipovich
- Nizhny Novgorod State Technical University n.a. R.E. Alexeev Russian Federation Nizhni Novgorod 24 Ulitsa Minina (Minin street)
| | - Oleg A. Kazantsev
- Nizhny Novgorod State Technical University n.a. R.E. Alexeev Russian Federation Nizhni Novgorod 24 Ulitsa Minina (Minin street)
| | - Misha Rumyantsev
- Nizhny Novgorod State Technical University n.a. R.E. Alexeev Russian Federation Nizhni Novgorod 24 Ulitsa Minina (Minin street)
| | - Mikhail S. Korotaev
- Nizhny Novgorod State Technical University n.a. R.E. Alexeev Russian Federation Nizhni Novgorod 24 Ulitsa Minina (Minin street)
| | - Anton E. Rogozhin
- Nizhny Novgorod State Technical University n.a. R.E. Alexeev Russian Federation Nizhni Novgorod 24 Ulitsa Minina (Minin street)
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11
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Shi X, León F, Sim Y, Quek S, Hum G, Khoo YXJ, Ng ZX, Par MY, Ong HC, Singh VK, Ganguly R, Clegg JK, Díaz J, García F. N‐Bridged Acyclic Trimeric Poly‐Cyclodiphosphazanes: Highly Tuneable Cyclodiphosphazane Building Blocks. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008214] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Xiaoyan Shi
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
- School of Materials and Energy Guangdong University of Technology Guangzhou 510006 Guangdong P. R. China
| | - Felix León
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Ying Sim
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Shina Quek
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Gavin Hum
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Yi Xin Joycelyn Khoo
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Zi Xuan Ng
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Mian Yang Par
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - How Chee Ong
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Varun K. Singh
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Rakesh Ganguly
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
- Department of Chemistry Shiv Nadar University NH91, Tehsil Dadri Gautam Buddha Nagard 201314 Uttar Pradesh India
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences The University of Queensland Cooper Road St Lucia 4072 Queensland Australia
| | - Jesús Díaz
- Departamento de Química Orgánica e Inorgánica Facultad de Veterinaria Universidad de Extremadura Avda de la Universidad s/n 10003 Cáceres Spain
| | - Felipe García
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
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12
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Mammadova F, Hamarat B, Ahmadli D, Şahin O, Bozkaya U, Türkmen YE. Polarization‐Enhanced Hydrogen Bonding in 1,8‐Dihydroxynaphthalene: Conformational Analysis, Binding Studies and Hydrogen Bonding Catalysis. ChemistrySelect 2020. [DOI: 10.1002/slct.202002960] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Flora Mammadova
- Department of Chemistry, Faculty of Science Bilkent University Ankara 06800 Turkey
| | - Büşra Hamarat
- Department of Chemistry Hacettepe University Ankara 06800 Turkey
| | - Dilgam Ahmadli
- Department of Chemistry, Faculty of Science Bilkent University Ankara 06800 Turkey
| | - Onur Şahin
- Scientific and Technological Research Application and Research Center Sinop University Sinop 57000 Turkey
| | - Uğur Bozkaya
- Department of Chemistry Hacettepe University Ankara 06800 Turkey
| | - Yunus E. Türkmen
- Department of Chemistry, Faculty of Science Bilkent University Ankara 06800 Turkey
- UNAM-National Nanotechnology Research Center, Institute of Materials Science and Nanotechnology Bilkent University Ankara 06800 Turkey
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13
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Shi X, León F, Sim Y, Quek S, Hum G, Khoo YXJ, Ng ZX, Par MY, Ong HC, Singh VK, Ganguly R, Clegg JK, Díaz J, García F. N-Bridged Acyclic Trimeric Poly-Cyclodiphosphazanes: Highly Tuneable Cyclodiphosphazane Building Blocks. Angew Chem Int Ed Engl 2020; 59:22100-22108. [PMID: 32696527 DOI: 10.1002/anie.202008214] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 07/16/2020] [Indexed: 01/15/2023]
Abstract
We have synthesized a completely new family of acyclic trimeric cyclodiphosphazane compounds comprising NH, Ni Pr, Nt Bu and NPh bridging groups. In addition, the first NH-bridged acyclic dimeric cyclophosphazane has been produced. The trimeric species display highly tuneable characteristics so that the distance between the terminal N(H)R moieties can be readily modulated by the steric bulk present in the bridging groups (ranging from ≈6 to ≈10 Å). Moreover, these species exhibit pronounced topological changes when a weak non-bonding NH⋅⋅⋅π aryl interaction is introduced. Finally, the NH-bridged chloride binding affinities have been calculated and benchmarked along with the existing experimental data available for monomeric cyclodiphosphazanes. Our results underscore these species as promising hydrogen bond donors for supramolecular host-guest applications.
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Affiliation(s)
- Xiaoyan Shi
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore.,School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, Guangdong, P. R. China
| | - Felix León
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Ying Sim
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Shina Quek
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Gavin Hum
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Yi Xin Joycelyn Khoo
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Zi Xuan Ng
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Mian Yang Par
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - How Chee Ong
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Varun K Singh
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Rakesh Ganguly
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore.,Department of Chemistry, Shiv Nadar University, NH91, Tehsil Dadri, Gautam Buddha Nagard, 201314, Uttar Pradesh, India
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, Cooper Road, St Lucia, 4072, Queensland, Australia
| | - Jesús Díaz
- Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria Universidad de Extremadura, Avda de la Universidad s/n, 10003, Cáceres, Spain
| | - Felipe García
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
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14
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Jennings JJ, Milic M, Targos K, Franz AK. NMR quantification of H-bond donating ability for bioactive functional groups and isosteres. Eur J Med Chem 2020; 207:112693. [PMID: 32862126 DOI: 10.1016/j.ejmech.2020.112693] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 07/15/2020] [Accepted: 07/24/2020] [Indexed: 12/20/2022]
Abstract
The H-bond donating ability for 127 compounds including drug fragments and isosteres have been quantified using a simple and rapid method with 31P NMR spectroscopy. Functional groups important to medicinal chemistry were evaluated including carboxylic acids, alcohols, phenols, thioic acids and nitrogen group H-bond donors. 31P NMR shifts for binding to a phosphine oxide probe have a higher correlation with equilibrium constants for H-bonding (log KHA) than acidity (pKa), indicating that these binding experiments are representative of H-bonding ability and not proton transfer. Additionally, 31P NMR binding data for carboxylic acid isosteres correlates with physicochemical properties such as lipophilicity, membrane permeability and plasma protein binding. This method has been used to evaluate the H-bond donating ability of small molecule drug compounds such as NSAIDs and antimicrobials.
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Affiliation(s)
- Julia J Jennings
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616, United States
| | - Mira Milic
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616, United States
| | - Karina Targos
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616, United States
| | - Annaliese K Franz
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616, United States.
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15
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Riegel GF, Kass SR. N-Vinyl and N-Aryl Hydroxypyridinium Ions: Charge-Activated Catalysts with Electron-Withdrawing Groups. J Org Chem 2020; 85:6017-6026. [DOI: 10.1021/acs.joc.0c00498] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- George F. Riegel
- Department of Chemistry, University of Minnesota, 207 Pleasant Street, SE, Minneapolis, Minnesota 55455, United States
| | - Steven R. Kass
- Department of Chemistry, University of Minnesota, 207 Pleasant Street, SE, Minneapolis, Minnesota 55455, United States
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16
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Payne C, Kass SR. Structural considerations for charge‐enhanced Brønsted acid catalysts. J PHYS ORG CHEM 2020. [DOI: 10.1002/poc.4069] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Curtis Payne
- Department of Chemistry University of Minnesota Minneapolis MN USA
| | - Steven R. Kass
- Department of Chemistry University of Minnesota Minneapolis MN USA
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17
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H-bond catalytic mechanism of aromatic electrophilic substitution between phenol and formaldehyde. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Alirezvani Z, Dekamin MG, Valiey E. New Hydrogen-Bond-Enriched 1,3,5-Tris(2-hydroxyethyl) Isocyanurate Covalently Functionalized MCM-41: An Efficient and Recoverable Hybrid Catalyst for Convenient Synthesis of Acridinedione Derivatives. ACS OMEGA 2019; 4:20618-20633. [PMID: 31858048 PMCID: PMC6906789 DOI: 10.1021/acsomega.9b02755] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 10/28/2019] [Indexed: 05/03/2023]
Abstract
A new nano-ordered 1,3,5-tris(2-hydroxyethyl) isocyanurate-1,3-propylene covalently functionalized MCM-41 (MCM-41-Pr-THEIC) was designed and prepared at room temperature through a simple procedure. According to various microscopic, spectroscopic, or thermal methods and techniques, the correlation of the catalytic performance of the hybrid mesoporous MCM-41-Pr-THEIC to its structural characteristics was fully confirmed. The new MCM-41-Pr-THEIC organosilica nanomaterials were successfully investigated as a solid mild nanocatalyst through hydrogen-bonding activation provided by its organic moiety, for the pseudo-four-component condensation of dimedone, aldehydes, and ammonium acetate or p-toluidine to afford the corresponding acridinedione derivatives under green conditions. Furthermore, the introduced nanocatalyst could be reused at least four times with negligible loss of its activity, indicating the good stability and high activity of the new hybrid organosilica.
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Affiliation(s)
- Zahra Alirezvani
- Pharmaceutical and Heterocyclic
Compounds Research Laboratory, Department of Chemistry, Iran University of Science and Technology, Tehran 16846-13114, Iran
| | - Mohammad G. Dekamin
- Pharmaceutical and Heterocyclic
Compounds Research Laboratory, Department of Chemistry, Iran University of Science and Technology, Tehran 16846-13114, Iran
| | - Ehsan Valiey
- Pharmaceutical and Heterocyclic
Compounds Research Laboratory, Department of Chemistry, Iran University of Science and Technology, Tehran 16846-13114, Iran
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19
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Smajlagic I, Carlson B, Rosano N, Foy H, Dudding T. Charge-enhanced thiourea catalysts as hydrogen bond donors for Friedel‒Crafts Alkylations. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130757] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Ehrhard AA, Jäger S, Malm C, Basaran S, Hunger J. CF3-groups critically enhance the binding of thiourea catalysts to ketones – a NMR and FT-IR study. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111829] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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Jiang Z, Zhao J, Zhang G. Ionic Organocatalyst with a Urea Anion and Tetra- n-butyl Ammonium Cation for Rapid, Selective, and Versatile Ring-Opening Polymerization of Lactide. ACS Macro Lett 2019; 8:759-765. [PMID: 35619515 DOI: 10.1021/acsmacrolett.9b00418] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A highly active and chemoselective ionic organocatalyst is developed for room-temperature living/controlled ring-opening polymerization of lactide. The catalysts are prepared by a simple dehydration reaction between tetra-n-butyl ammonium hydroxide and an N,N'-diarylurea and used in cooperation with hydroxy initiators. Typically, poly(l-lactide) with near perfect isotacticity and widely tunable molar mass (4-130 kg mol-1) can be produced in <2 min (turnover frequency up to 120 000 h-1). Low molar mass distribution is observed in both short and substantially extended reaction times, clearly demonstrating the selectivity of catalyst for monomer enchainment over macromolecular transesterification. Versatile design and construction of diverse polylactide-based macromolecular structures are allowed thanks to the livingness of the polymerization and independence of initiator and catalyst. In addition to the hydrogen bond donor-acceptor type bifunctional activation mechanism, direct nucleophilic attack of the urea anion on the monomer and polymer is also shown which can be suppressed by the added hydroxy initiator.
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Affiliation(s)
- Zhuolun Jiang
- Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
| | - Junpeng Zhao
- Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
| | - Guangzhao Zhang
- Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
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22
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Jiang ZL, Zhao JP, Zhang GZ. Readily Prepared and Tunable Ionic Organocatalysts for Ring-opening Polymerization of Lactones. CHINESE JOURNAL OF POLYMER SCIENCE 2019. [DOI: 10.1007/s10118-019-2285-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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23
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Bhowal R, Biswas S, Thumbarathil A, Koner AL, Chopra D. Exploring the Relationship between Intermolecular Interactions and Solid-State Photophysical Properties of Organic Co-Crystals. THE JOURNAL OF PHYSICAL CHEMISTRY C 2019; 123:9311-9322. [DOI: 10.1021/acs.jpcc.8b10643] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
Affiliation(s)
- Rohit Bhowal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, India
| | - Suprakash Biswas
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, India
| | - Athulbabu Thumbarathil
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, India
| | - Apurba L. Koner
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, India
| | - Deepak Chopra
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, India
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24
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Cywar RM, Zhu JB, Chen EYX. Selective or living organopolymerization of a six-five bicyclic lactone to produce fully recyclable polyesters. Polym Chem 2019. [DOI: 10.1039/c9py00190e] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A ring-fused γ-butyrolactone can be selectively ring-open polymerized at room temperature by N-heterocyclic carbenes to cyclic polyester or by bifunctional (thio)urea and base pairs in a living fashion to high molecular weight linear polyester that can be organocatalytically and quantitatively recycled at 120 °C.
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Affiliation(s)
- Robin M. Cywar
- Department of Chemistry
- Colorado State University
- Fort Collins
- USA
| | - Jian-Bo Zhu
- Department of Chemistry
- Colorado State University
- Fort Collins
- USA
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25
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Yan CX, Wu RZ, Lu K, Yang FL, Yang XS, Wang R, Yang X, Zhou PP, Shao X. Why electrostatically enhanced thiourea is better than Schreiner's thiourea in both catalytic activity and regioselectivity? Org Chem Front 2019. [DOI: 10.1039/c9qo00251k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electrostatically enhanced thiourea is more active and efficient than Schreiner's thiourea in the ring-opening aminolysis of styrene oxide with aniline, and the underlying reasons were explored by DFT calculations.
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Affiliation(s)
- Chao-Xian Yan
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Rui-Zhi Wu
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Ka Lu
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Fang-Ling Yang
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Xiao-Shan Yang
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Rui Wang
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Xing Yang
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Pan-Pan Zhou
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Xiangfeng Shao
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
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26
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Diemoz KM, Franz AK. NMR Quantification of Hydrogen-Bond-Activating Effects for Organocatalysts including Boronic Acids. J Org Chem 2018; 84:1126-1138. [PMID: 30516381 DOI: 10.1021/acs.joc.8b02389] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The hydrogen-bonding activation for 66 organocatalysts has been quantified using a 31P NMR binding experiment with triethylphosphine oxide (TEPO). Diverse structural classes, including phenols, diols, silanols, carboxylic acids, boronic acids, and phosphoric acids, were examined with a variety of steric and electronic modifications to understand how the structure and secondary effects contribute to hydrogen-bonding ability and catalysis. Hammett plots demonstrate high correlation for the Δδ 31P NMR shift to Hammett parameters, establishing the ability of TEPO binding to predict electronic trends. Upon correlation to catalytic activity in a Friedel-Crafts addition reaction, data demonstrate that 31P NMR shifts correlate to catalytic activity better than p Ka values. Boronic acids were investigated, and 31P NMR binding experiments predicted strong hydrogen-bonding ability, for which catalytic activity was confirmed, resulting in the greatest rate enhancement observed in the Friedel-Crafts addition of all organocatalysts studied. A detailed investigation supports that boronic acid activation proceeds through hydrogen-bonding interactions and not coordination with the Lewis acidic boron center. Using 31P NMR spectroscopy offers a simple and rapid tool to quantify and predict hydrogen-bonding abilities for the design and applications of new organocatalysts and supramolecular synthons.
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Affiliation(s)
- Kayla M Diemoz
- Department of Chemistry , University of California , One Shields Avenue , Davis , California 95616 , United States
| | - Annaliese K Franz
- Department of Chemistry , University of California , One Shields Avenue , Davis , California 95616 , United States
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27
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Yousefi R, Struble TJ, Payne JL, Vishe M, Schley ND, Johnston JN. Catalytic, Enantioselective Synthesis of Cyclic Carbamates from Dialkyl Amines by CO 2-Capture: Discovery, Development, and Mechanism. J Am Chem Soc 2018; 141:618-625. [PMID: 30582326 DOI: 10.1021/jacs.8b11793] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Cyclic carbamates are a common feature of small-molecule therapeutics, offering a constrained hydrogen bond acceptor that is both polar and sterically small. Methods for their preparation most often focus first on amino alcohol synthesis and then reaction with phosgene or its equivalent. This report describes an enantioselective synthesis of cyclic carbamates in which carbon dioxide engages an unsaturated basic amine, facilitated by a bifunctional organocatalyst designed to stabilize a carbamic acid intermediate while activating it toward subsequent enantioselective carbon-oxygen bond formation. Six-membered cyclic carbamates are prepared in good yield with high levels of enantioselection, as constrained 1,3-amino alcohols featuring a chiral tertiary alcohol carbon. Spectroscopic analysis (NMR, DOSY) of various substrate-reagent combinations provides insight into the dominant species under the reaction conditions. Two peculiar requirements were identified to achieve highest consistency: a "Goldilocks" amount of water and the use of a noncrystalline form of the ligand. These atypical features of the final protocol notwithstanding, a diverse range of products could be prepared. Their functionalizations illustrate the versatility of the carbamates as precursors to enantioenriched small molecules.
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Affiliation(s)
- Roozbeh Yousefi
- Department of Chemistry and Vanderbilt Institute of Chemical Biology , Vanderbilt University , Nashville , Tennessee 37235 , United States
| | - Thomas J Struble
- Department of Chemistry and Vanderbilt Institute of Chemical Biology , Vanderbilt University , Nashville , Tennessee 37235 , United States
| | - Jenna L Payne
- Department of Chemistry and Vanderbilt Institute of Chemical Biology , Vanderbilt University , Nashville , Tennessee 37235 , United States
| | - Mahesh Vishe
- Department of Chemistry and Vanderbilt Institute of Chemical Biology , Vanderbilt University , Nashville , Tennessee 37235 , United States
| | - Nathan D Schley
- Department of Chemistry and Vanderbilt Institute of Chemical Biology , Vanderbilt University , Nashville , Tennessee 37235 , United States
| | - Jeffrey N Johnston
- Department of Chemistry and Vanderbilt Institute of Chemical Biology , Vanderbilt University , Nashville , Tennessee 37235 , United States
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28
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Fan Y, Payne C, Kass SR. Quantification of Catalytic Activity for Electrostatically Enhanced Thioureas via Reaction Kinetics and UV-vis Spectroscopic Measurement. J Org Chem 2018; 83:10855-10863. [PMID: 30021436 DOI: 10.1021/acs.joc.8b01552] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Charged thiourea derivatives containing one and two methylated or octylated pyridinium ion centers and a tetraarylborate or triflate counteranion are reported. These novel catalysts are much more active in the Friedel-Crafts reactions of trans-β-nitroalkenes with N-methylindoles than the privileged N, N'-bis(3,5-bis(trifluoromethyl)phenyl)thiourea (i.e., Schreiner's thiourea) by up to 2-3 orders of magnitude. A previously reported UV-vis spectroscopic method by Kozlowski et al. was exploited to rationalize their reactivity order along with noncharged analogues. These results offer a new design strategy for organocatalysts by introducing positively charged centers without adding additional N-H, O-H, or S-H hydrogen bond donor sites.
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Affiliation(s)
- Yang Fan
- Department of Chemistry , University of Minnesota , 207 Pleasant Street, SE , Minneapolis , Minnesota 55455 , United States
| | - Curtis Payne
- Department of Chemistry , University of Minnesota , 207 Pleasant Street, SE , Minneapolis , Minnesota 55455 , United States
| | - Steven R Kass
- Department of Chemistry , University of Minnesota , 207 Pleasant Street, SE , Minneapolis , Minnesota 55455 , United States
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29
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Lin B, Waymouth RM. Organic Ring-Opening Polymerization Catalysts: Reactivity Control by Balancing Acidity. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00540] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Binhong Lin
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Robert M. Waymouth
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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30
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Li X, You C, Yang Y, Yang Y, Li P, Gu G, Chung LW, Lv H, Zhang X. Rhodium-catalyzed asymmetric hydrogenation of β-cyanocinnamic esters with the assistance of a single hydrogen bond in a precise position. Chem Sci 2018; 9:1919-1924. [PMID: 29675238 PMCID: PMC5890790 DOI: 10.1039/c7sc04639a] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 01/02/2018] [Indexed: 12/24/2022] Open
Abstract
The first asymmetric hydrogenation of β-cyanoacrylate esters has been developed to furnish chiral β-cyano esters with excellent yields and excellent enantioselectivities. Notably, the catalyst with a single H-bond donor in a precise position performed better than that with double H-bond donors.
With the assistance of hydrogen bonds, the first asymmetric hydrogenation of β-cyanocinnamic esters is developed, affording chiral β-cyano esters with excellent enantioselectivities (up to 99% ee). This novel methodology provides an efficient and concise synthetic route to chiral GABA-derivatives such as (S)-Pregabalin, (R)-Phenibut, (R)-Baclofen. Interestingly, in this system, the catalyst with a single H-bond donor performs better than that with double H-bond donors, which is a novel discovery in the metalorganocatalysis area.
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Affiliation(s)
- Xiuxiu Li
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China .
| | - Cai You
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China .
| | - Yusheng Yang
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China .
| | - Yuhong Yang
- Department of Chemistry , Southern University of Science and Technology , Shenzhen , Guangdong 518055 , P. R. China .
| | - Pan Li
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China .
| | - Guoxian Gu
- Department of Chemistry , Southern University of Science and Technology , Shenzhen , Guangdong 518055 , P. R. China .
| | - Lung Wa Chung
- Department of Chemistry , Southern University of Science and Technology , Shenzhen , Guangdong 518055 , P. R. China .
| | - Hui Lv
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China . .,Engineering Research Center of Organosilicon Compounds & Materials , Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , 430072 , China
| | - Xumu Zhang
- Key Laboratory of Biomedical Polymers of Ministry of Education , College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , Hubei 430072 , P. R. China . .,Department of Chemistry , Southern University of Science and Technology , Shenzhen , Guangdong 518055 , P. R. China .
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31
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Mitra R, Niemeyer J. Dual Brønsted-acid Organocatalysis: Cooperative Asymmetric Catalysis with Combined Phosphoric and Carboxylic Acids. ChemCatChem 2018. [DOI: 10.1002/cctc.201701698] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Raja Mitra
- Institute of Organic Chemistry; Department of Chemistry; University of Duisburg-Essen; Universitätsstrasse 7 45141 Essen Germany
| | - Jochen Niemeyer
- Institute of Organic Chemistry; Department of Chemistry; University of Duisburg-Essen; Universitätsstrasse 7 45141 Essen Germany
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32
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Wolf FF, Neudörfl JM, Goldfuss B. Hydrogen-bonding cyclodiphosphazanes: superior effects of 3,5-(CF3)2-substitution in anion-recognition and counter-ion catalysis. NEW J CHEM 2018. [DOI: 10.1039/c7nj04660j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Syntheses, X-ray characterization and employment of new cyclodiphosph(v)azane hydrogen-bonding catalysts in experimental and computational anion recognition and the N-acyl-Mannich reaction.
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Affiliation(s)
- Florian F. Wolf
- Institut für Organische Chemie
- Universität zu Köln
- 50939 Köln
- Germany
| | - Jörg-M. Neudörfl
- Institut für Organische Chemie
- Universität zu Köln
- 50939 Köln
- Germany
| | - Bernd Goldfuss
- Institut für Organische Chemie
- Universität zu Köln
- 50939 Köln
- Germany
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33
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Rumyantsev M, Rumyantsev S. Combining advantages of homogeneous organocatalysis and heterogeneous catalysis with thermosensitive single-chain nanoparticles in a representative tetrahydropyranilation of alcohols. POLYMER 2018. [DOI: 10.1016/j.polymer.2017.12.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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34
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Larsen D, Langhorn LM, Akselsen OM, Nielsen BE, Pittelkow M. Thiosemicarbazone organocatalysis: tetrahydropyranylation and 2-deoxygalactosylation reactions and kinetics-based mechanistic investigation. Chem Sci 2017; 8:7978-7982. [PMID: 29568444 PMCID: PMC5853554 DOI: 10.1039/c7sc03366d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 09/27/2017] [Indexed: 12/17/2022] Open
Abstract
The first use of thiosemicarbazone-based organocatalysis was demonstrated on both tetrahydropyranylation and 2-deoxygalactosylation reactions. The organocatalysts were optimised using kinetics-based selection. The best catalyst outperformed previously reported thiourea catalysts for tetrahydropyranylation by 50-fold. Hammett investigations of both the organocatalyst and the substrate indicate an oxyanion hole-like reaction mechanism.
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Affiliation(s)
- Dennis Larsen
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen , Denmark .
| | - Line M Langhorn
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen , Denmark .
| | - Olivia M Akselsen
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen , Denmark .
| | - Bjarne E Nielsen
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen , Denmark .
| | - Michael Pittelkow
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen , Denmark .
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35
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Diemoz KM, Hein JE, Wilson SO, Fettinger JC, Franz AK. Reaction Progress Kinetics Analysis of 1,3-Disiloxanediols as Hydrogen-Bonding Catalysts. J Org Chem 2017; 82:6738-6747. [DOI: 10.1021/acs.joc.7b00875] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Kayla M. Diemoz
- Department
of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Jason E. Hein
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC Canada, V6T1Z1
| | - Sean O. Wilson
- Department
of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - James C. Fettinger
- Department
of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Annaliese K. Franz
- Department
of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
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36
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Neuvonen AJ, Földes T, Madarász Á, Pápai I, Pihko PM. Organocatalysts Fold To Generate an Active Site Pocket for the Mannich Reaction. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00336] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Antti J. Neuvonen
- Department
of Chemistry and NanoScience Center, University of Jyväskylä, FI-40014 Jyväskylän yliopisto, Finland
| | - Tamás Földes
- Research
Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok
körútja 2, H-1117 Budapest, Hungary
| | - Ádám Madarász
- Research
Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok
körútja 2, H-1117 Budapest, Hungary
| | - Imre Pápai
- Research
Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok
körútja 2, H-1117 Budapest, Hungary
| | - Petri M. Pihko
- Department
of Chemistry and NanoScience Center, University of Jyväskylä, FI-40014 Jyväskylän yliopisto, Finland
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37
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Yang C, Wang J, Liu Y, Ni X, Li X, Cheng J. Study on the Catalytic Behavior of Bifunctional Hydrogen‐Bonding Catalysts Guided by Free Energy Relationship Analysis of Steric Parameters. Chemistry 2017; 23:5488-5497. [DOI: 10.1002/chem.201605666] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Indexed: 01/09/2023]
Affiliation(s)
- Chen Yang
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Jie Wang
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Yang Liu
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Xiang Ni
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Xin Li
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300071 P. R. China
| | - Jin‐Pei Cheng
- State Key Laboratory of Elemento-organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300071 P. R. China
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38
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Jiménez EI, Vallejo Narváez WE, Rocha-Rinza T, Hernández-Rodríguez M. Design and application of a bifunctional organocatalyst guided by electron density topological analyses. Catal Sci Technol 2017. [DOI: 10.1039/c7cy00430c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Design of a catalyst via the identification of key interactions within the transition state with quantum chemical topology.
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Affiliation(s)
- Eddy I. Jiménez
- Institute of Chemistry
- National Autonomous University of Mexico
- Circuito Exterior
- Ciudad Universitaria
- Mexico City
| | - Wilmer E. Vallejo Narváez
- Institute of Chemistry
- National Autonomous University of Mexico
- Circuito Exterior
- Ciudad Universitaria
- Mexico City
| | - Tomás Rocha-Rinza
- Institute of Chemistry
- National Autonomous University of Mexico
- Circuito Exterior
- Ciudad Universitaria
- Mexico City
| | - Marcos Hernández-Rodríguez
- Institute of Chemistry
- National Autonomous University of Mexico
- Circuito Exterior
- Ciudad Universitaria
- Mexico City
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39
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Okada Y, Sugai M, Chiba K. Hydrogen-Bonding-Induced Fluorescence: Water-Soluble and Polarity-Independent Solvatochromic Fluorophores. J Org Chem 2016; 81:10922-10929. [DOI: 10.1021/acs.joc.6b01969] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Yohei Okada
- Department
of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Masae Sugai
- Department
of Applied Biological Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| | - Kazuhiro Chiba
- Department
of Applied Biological Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
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40
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Wen J, Jiang J, Zhang X. Rhodium-Catalyzed Asymmetric Hydrogenation of α,β-Unsaturated Carbonyl Compounds via Thiourea Hydrogen Bonding. Org Lett 2016; 18:4451-3. [DOI: 10.1021/acs.orglett.6b01812] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jialin Wen
- Department
of Chemistry and Chemical Biology, Rutgers, the State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Jun Jiang
- College
of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
| | - Xumu Zhang
- Department
of Chemistry and Chemical Biology, Rutgers, the State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854, United States
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41
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Jiménez EI, Vallejo Narváez WE, Román-Chavarría CA, Vazquez-Chavez J, Rocha-Rinza T, Hernández-Rodríguez M. Bifunctional Thioureas with α-Trifluoromethyl or Methyl Groups: Comparison of Catalytic Performance in Michael Additions. J Org Chem 2016; 81:7419-7431. [PMID: 27400400 DOI: 10.1021/acs.joc.6b01063] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Thioureas are an important scaffold in organocatalysis because of their ability to form hydrogen bonds that activate substrates and fix them in a defined position, which allows a given reaction to occur. Structures that enhance the acidity of the thiourea are usually used to increase the hydrogen-bonding properties, such as 3,5-bis(trifluoromethyl)phenyl and boronate ureas. Herein, we report the synthesis of bifunctional thioureas with a chiral moiety that include either a trifluoromethyl or methyl group. Their catalytic performance in representative Michael addition reactions was used in an effort to compare the electronic effects of the fluorination at the methyl group. The observed differences concerning yields and ee values cannot be attributed solely to the different steric environments; theoretical results indicate distinct interactions within the corresponding transition states. The calculated transition states show that the fluorinated catalysts have stronger N-H···O and C-H···F hydrogen bonds, while the nonfluorinated systems have C-H···π contacts. These results have shown that a variety of hydrogen-bonding interactions are important in determining the yield and selectivity of thiourea organocatalysis. These details can be further exploited in catalyst design.
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Affiliation(s)
- Eddy I Jiménez
- Institute of Chemistry, National Autonomous University of Mexico , Circuito Exterior, Ciudad Universitaria, Del. Coyoacán, 04510 Cd. Mx., Mexico
| | - Wilmer E Vallejo Narváez
- Institute of Chemistry, National Autonomous University of Mexico , Circuito Exterior, Ciudad Universitaria, Del. Coyoacán, 04510 Cd. Mx., Mexico
| | - Carlos A Román-Chavarría
- Institute of Chemistry, National Autonomous University of Mexico , Circuito Exterior, Ciudad Universitaria, Del. Coyoacán, 04510 Cd. Mx., Mexico
| | - Josue Vazquez-Chavez
- Institute of Chemistry, National Autonomous University of Mexico , Circuito Exterior, Ciudad Universitaria, Del. Coyoacán, 04510 Cd. Mx., Mexico
| | - Tomás Rocha-Rinza
- Institute of Chemistry, National Autonomous University of Mexico , Circuito Exterior, Ciudad Universitaria, Del. Coyoacán, 04510 Cd. Mx., Mexico
| | - Marcos Hernández-Rodríguez
- Institute of Chemistry, National Autonomous University of Mexico , Circuito Exterior, Ciudad Universitaria, Del. Coyoacán, 04510 Cd. Mx., Mexico
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42
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Ford DD, Lehnherr D, Kennedy CR, Jacobsen EN. On- and Off-Cycle Catalyst Cooperativity in Anion-Binding Catalysis. J Am Chem Soc 2016; 138:7860-7863. [PMID: 27276389 PMCID: PMC5108296 DOI: 10.1021/jacs.6b04686] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Chiral, neutral H-bond donors have found widespread use as catalysts in enantioselective reactions involving ion-pair intermediates. Herein, a systematic mechanistic study of a prototypical anion-binding reaction, the thiourea-catalyzed enantioselective alkylation of α-chloroethers, is detailed. This study reveals that the catalyst resting state is an inactive dimeric aggregate that must dissociate and then reassemble to form a 2:1 catalyst-substrate complex in the rate-determining transition structure. Insight into this mode of catalyst cooperativity sheds light on the practical limitations that have plagued many of the H-bond donor-catalyzed reactions developed to date and suggests design strategies for new, highly efficient catalyst structures.
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Affiliation(s)
- David D. Ford
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Dan Lehnherr
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
| | - C. Rose Kennedy
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Eric N. Jacobsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
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43
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Haldar T, Bagchi S. Electrostatic Interactions Are Key to C═O n-π* Shifts: An Experimental Proof. J Phys Chem Lett 2016; 7:2270-2275. [PMID: 27249517 DOI: 10.1021/acs.jpclett.6b01052] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Carbonyl n-π* transitions are known to undergo blue shift in polar and hydrogen-bonding solvents. Using semiempirical expressions, previous studies hypothesized several factors like change in dipole moment and hydrogen-bond strength upon excitation to cause the blue shift. Theoretically, ground-state electrostatics has been predicted to be the key to the observed shifts, however, an experimental proof has been lacking. Our experimental results demonstrate a consistent linear correlation between IR (ground-state phenomenon) and n-π* frequency shifts (involves both ground and excited electronic-states) of carbonyls in hydrogen-bonded and non-hydrogen-bonded environments. The carbonyl hydrogen-bonding status is experimentally verified from deviation in n-π*/fluorescence correlation. The IR/n-π* correlation validates the key role of electrostatic stabilization of the ground state toward n-π* shifts and demonstrates the electrostatic nature of carbonyl hydrogen bonds. n-π* shifts show linear sensitivity to calculated electrostatic fields on carbonyls. Our results portray the potential for n-π* absorption to estimate local polarity in biomolecules and to probe chemical reactions involving carbonyl activation/stabilization.
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Affiliation(s)
- Tapas Haldar
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune 411008, India
| | - Sayan Bagchi
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune 411008, India
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44
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Wolf FF, Klare H, Goldfuss B. Asymmetric Michael Additions of 4-Hydroxycoumarin to β-Nitrostyrenes with Chiral, Bifunctional Hydrogen-Bonding Catalysts. J Org Chem 2016; 81:1762-8. [DOI: 10.1021/acs.joc.5b02167] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Florian F. Wolf
- Institut für Organische Chemie, Universität zu Köln, Greinstrasse 4, 50939 Köln, Germany
| | - Helge Klare
- Institut für Organische Chemie, Universität zu Köln, Greinstrasse 4, 50939 Köln, Germany
| | - Bernd Goldfuss
- Institut für Organische Chemie, Universität zu Köln, Greinstrasse 4, 50939 Köln, Germany
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45
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Zhi X, Liu J, Li Z, Wang H, Wang X, Cui S, Chen C, Zhao C, Li X, Guo K. Ionic hydrogen bond donor organocatalyst for fast living ring-opening polymerization. Polym Chem 2016. [DOI: 10.1039/c5py01315a] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A positive charge enhanced H-bond donor combined with H-bond acceptor as a bifunctional organocatalyst enables fast living ring-opening polymerization of lactide.
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46
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Xu S, Sun H, Liu J, Xu J, Pan X, Dong H, Liu Y, Li Z, Guo K. Internal Lewis pair enhanced H-bond donor: boronate-urea and tertiary amine co-catalysis in ring-opening polymerization. Polym Chem 2016. [DOI: 10.1039/c6py01436d] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new protocol of internal Lewis pair enhanced H-bond (LPHBD) catalysis for ring opening polymerisation was developed using boronate-urea (BU) as a representative LPHBD combined with tertiary amines.
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Affiliation(s)
- Songquan Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Herui Sun
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Jingjing Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Jiaxi Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Xianfu Pan
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - He Dong
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Yaya Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Zhenjiang Li
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Kai Guo
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- China
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47
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Ni X, Li X, Li Z, Cheng JP. Equilibrium acidities of BINOL type chiral phenolic hydrogen bonding donors in DMSO. Org Chem Front 2016. [DOI: 10.1039/c6qo00252h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The pKa values of fifteen BINOL type chiral phenolic catalysts were determined by the overlapping indicator method in DMSO via UV spectrophotometric titrations. The pKa values are in the range of 9.30–16.43.
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Affiliation(s)
- Xiang Ni
- State Key Laboratory of Elemento-Organic Chemistry
- Department of Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Xin Li
- State Key Laboratory of Elemento-Organic Chemistry
- Department of Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Zhen Li
- State Key Laboratory of Elemento-Organic Chemistry
- Department of Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Jin-Pei Cheng
- Collaborative Innovation Center of Chemical Science and Engineering
- Tianjin 300071
- China
- Center of Basic Molecular Science
- Department of Chemistry
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48
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Experimental and Theoretical Studies in Hydrogen-Bonding Organocatalysis. Molecules 2015; 20:15500-24. [PMID: 26343615 PMCID: PMC6331831 DOI: 10.3390/molecules200915500] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 08/14/2015] [Accepted: 08/17/2015] [Indexed: 12/31/2022] Open
Abstract
Chiral thioureas and squaramides are among the most prominent hydrogen-bond bifunctional organocatalysts now extensively used for various transformations, including aldol, Michael, Mannich and Diels-Alder reactions. More importantly, the experimental and computational study of the mode of activation has begun to attract considerable attention. Various experimental, spectroscopic and calculation methods are now frequently used, often as an integrated approach, to establish the reaction mechanism, the mode of activation or explain the stereochemical outcome of the reaction. This article comprises several case studies, sorted according to the method used in their study. The aim of this review is to give the investigators an overview of the methods currently utilized for mechanistic investigations in hydrogen-bonding organocatalysis.
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49
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Bhattarai B, Tay JH, Nagorny P. Thiophosphoramides as cooperative catalysts for copper-catalyzed arylation of carboxylates with diaryliodonium salts. Chem Commun (Camb) 2015; 51:5398-401. [DOI: 10.1039/c4cc08604j] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A thiophosphoramide-based co-catalyst was found to significantly accelerate copper(ii) trifluoromethanesulfonate-catalyzed arylation of potassium carboxylates with diaryliodonium salts.
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Affiliation(s)
| | - Jia-Hui Tay
- Department of Chemistry
- University of Michigan
- Ann Arbor
- USA
| | - Pavel Nagorny
- Department of Chemistry
- University of Michigan
- Ann Arbor
- USA
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